| #include "svm.h" |
| #include "libcflat.h" |
| #include "processor.h" |
| #include "desc.h" |
| #include "msr.h" |
| #include "vm.h" |
| #include "smp.h" |
| #include "alloc_page.h" |
| #include "isr.h" |
| #include "apic.h" |
| #include "delay.h" |
| #include "util.h" |
| #include "x86/usermode.h" |
| #include "vmalloc.h" |
| |
| #define SVM_EXIT_MAX_DR_INTERCEPT 0x3f |
| |
| #define LATENCY_RUNS 1000000 |
| |
| u64 tsc_start; |
| u64 tsc_end; |
| |
| u64 vmrun_sum, vmexit_sum; |
| u64 vmsave_sum, vmload_sum; |
| u64 stgi_sum, clgi_sum; |
| u64 latvmrun_max; |
| u64 latvmrun_min; |
| u64 latvmexit_max; |
| u64 latvmexit_min; |
| u64 latvmload_max; |
| u64 latvmload_min; |
| u64 latvmsave_max; |
| u64 latvmsave_min; |
| u64 latstgi_max; |
| u64 latstgi_min; |
| u64 latclgi_max; |
| u64 latclgi_min; |
| u64 runs; |
| |
| static void null_test(struct svm_test *test) |
| { |
| } |
| |
| static bool null_check(struct svm_test *test) |
| { |
| return vmcb->control.exit_code == SVM_EXIT_VMMCALL; |
| } |
| |
| static void prepare_no_vmrun_int(struct svm_test *test) |
| { |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMRUN); |
| } |
| |
| static bool check_no_vmrun_int(struct svm_test *test) |
| { |
| return vmcb->control.exit_code == SVM_EXIT_ERR; |
| } |
| |
| static void test_vmrun(struct svm_test *test) |
| { |
| asm volatile ("vmrun %0" : : "a"(virt_to_phys(vmcb))); |
| } |
| |
| static bool check_vmrun(struct svm_test *test) |
| { |
| return vmcb->control.exit_code == SVM_EXIT_VMRUN; |
| } |
| |
| static void prepare_rsm_intercept(struct svm_test *test) |
| { |
| default_prepare(test); |
| vmcb->control.intercept |= 1 << INTERCEPT_RSM; |
| vmcb->control.intercept_exceptions |= (1ULL << UD_VECTOR); |
| } |
| |
| static void test_rsm_intercept(struct svm_test *test) |
| { |
| asm volatile ("rsm" : : : "memory"); |
| } |
| |
| static bool check_rsm_intercept(struct svm_test *test) |
| { |
| return get_test_stage(test) == 2; |
| } |
| |
| static bool finished_rsm_intercept(struct svm_test *test) |
| { |
| switch (get_test_stage(test)) { |
| case 0: |
| if (vmcb->control.exit_code != SVM_EXIT_RSM) { |
| report_fail("VMEXIT not due to rsm. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| vmcb->control.intercept &= ~(1 << INTERCEPT_RSM); |
| inc_test_stage(test); |
| break; |
| |
| case 1: |
| if (vmcb->control.exit_code != SVM_EXIT_EXCP_BASE + UD_VECTOR) { |
| report_fail("VMEXIT not due to #UD. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| vmcb->save.rip += 2; |
| inc_test_stage(test); |
| break; |
| |
| default: |
| return true; |
| } |
| return get_test_stage(test) == 2; |
| } |
| |
| static void prepare_cr3_intercept(struct svm_test *test) |
| { |
| default_prepare(test); |
| vmcb->control.intercept_cr_read |= 1 << 3; |
| } |
| |
| static void test_cr3_intercept(struct svm_test *test) |
| { |
| asm volatile ("mov %%cr3, %0" : "=r"(test->scratch) : : "memory"); |
| } |
| |
| static bool check_cr3_intercept(struct svm_test *test) |
| { |
| return vmcb->control.exit_code == SVM_EXIT_READ_CR3; |
| } |
| |
| static bool check_cr3_nointercept(struct svm_test *test) |
| { |
| return null_check(test) && test->scratch == read_cr3(); |
| } |
| |
| static void corrupt_cr3_intercept_bypass(void *_test) |
| { |
| struct svm_test *test = _test; |
| extern volatile u32 mmio_insn; |
| |
| while (!__sync_bool_compare_and_swap(&test->scratch, 1, 2)) |
| pause(); |
| pause(); |
| pause(); |
| pause(); |
| mmio_insn = 0x90d8200f; // mov %cr3, %rax; nop |
| } |
| |
| static void prepare_cr3_intercept_bypass(struct svm_test *test) |
| { |
| default_prepare(test); |
| vmcb->control.intercept_cr_read |= 1 << 3; |
| on_cpu_async(1, corrupt_cr3_intercept_bypass, test); |
| } |
| |
| static void test_cr3_intercept_bypass(struct svm_test *test) |
| { |
| ulong a = 0xa0000; |
| |
| test->scratch = 1; |
| while (test->scratch != 2) |
| barrier(); |
| |
| asm volatile ("mmio_insn: mov %0, (%0); nop" |
| : "+a"(a) : : "memory"); |
| test->scratch = a; |
| } |
| |
| static void prepare_dr_intercept(struct svm_test *test) |
| { |
| default_prepare(test); |
| vmcb->control.intercept_dr_read = 0xff; |
| vmcb->control.intercept_dr_write = 0xff; |
| } |
| |
| static void test_dr_intercept(struct svm_test *test) |
| { |
| unsigned int i, failcnt = 0; |
| |
| /* Loop testing debug register reads */ |
| for (i = 0; i < 8; i++) { |
| |
| switch (i) { |
| case 0: |
| asm volatile ("mov %%dr0, %0" : "=r"(test->scratch) : : "memory"); |
| break; |
| case 1: |
| asm volatile ("mov %%dr1, %0" : "=r"(test->scratch) : : "memory"); |
| break; |
| case 2: |
| asm volatile ("mov %%dr2, %0" : "=r"(test->scratch) : : "memory"); |
| break; |
| case 3: |
| asm volatile ("mov %%dr3, %0" : "=r"(test->scratch) : : "memory"); |
| break; |
| case 4: |
| asm volatile ("mov %%dr4, %0" : "=r"(test->scratch) : : "memory"); |
| break; |
| case 5: |
| asm volatile ("mov %%dr5, %0" : "=r"(test->scratch) : : "memory"); |
| break; |
| case 6: |
| asm volatile ("mov %%dr6, %0" : "=r"(test->scratch) : : "memory"); |
| break; |
| case 7: |
| asm volatile ("mov %%dr7, %0" : "=r"(test->scratch) : : "memory"); |
| break; |
| } |
| |
| if (test->scratch != i) { |
| report_fail("dr%u read intercept", i); |
| failcnt++; |
| } |
| } |
| |
| /* Loop testing debug register writes */ |
| for (i = 0; i < 8; i++) { |
| |
| switch (i) { |
| case 0: |
| asm volatile ("mov %0, %%dr0" : : "r"(test->scratch) : "memory"); |
| break; |
| case 1: |
| asm volatile ("mov %0, %%dr1" : : "r"(test->scratch) : "memory"); |
| break; |
| case 2: |
| asm volatile ("mov %0, %%dr2" : : "r"(test->scratch) : "memory"); |
| break; |
| case 3: |
| asm volatile ("mov %0, %%dr3" : : "r"(test->scratch) : "memory"); |
| break; |
| case 4: |
| asm volatile ("mov %0, %%dr4" : : "r"(test->scratch) : "memory"); |
| break; |
| case 5: |
| asm volatile ("mov %0, %%dr5" : : "r"(test->scratch) : "memory"); |
| break; |
| case 6: |
| asm volatile ("mov %0, %%dr6" : : "r"(test->scratch) : "memory"); |
| break; |
| case 7: |
| asm volatile ("mov %0, %%dr7" : : "r"(test->scratch) : "memory"); |
| break; |
| } |
| |
| if (test->scratch != i) { |
| report_fail("dr%u write intercept", i); |
| failcnt++; |
| } |
| } |
| |
| test->scratch = failcnt; |
| } |
| |
| static bool dr_intercept_finished(struct svm_test *test) |
| { |
| ulong n = (vmcb->control.exit_code - SVM_EXIT_READ_DR0); |
| |
| /* Only expect DR intercepts */ |
| if (n > (SVM_EXIT_MAX_DR_INTERCEPT - SVM_EXIT_READ_DR0)) |
| return true; |
| |
| /* |
| * Compute debug register number. |
| * Per Appendix C "SVM Intercept Exit Codes" of AMD64 Architecture |
| * Programmer's Manual Volume 2 - System Programming: |
| * http://support.amd.com/TechDocs/24593.pdf |
| * there are 16 VMEXIT codes each for DR read and write. |
| */ |
| test->scratch = (n % 16); |
| |
| /* Jump over MOV instruction */ |
| vmcb->save.rip += 3; |
| |
| return false; |
| } |
| |
| static bool check_dr_intercept(struct svm_test *test) |
| { |
| return !test->scratch; |
| } |
| |
| static bool next_rip_supported(void) |
| { |
| return this_cpu_has(X86_FEATURE_NRIPS); |
| } |
| |
| static void prepare_next_rip(struct svm_test *test) |
| { |
| vmcb->control.intercept |= (1ULL << INTERCEPT_RDTSC); |
| } |
| |
| |
| static void test_next_rip(struct svm_test *test) |
| { |
| asm volatile ("rdtsc\n\t" |
| ".globl exp_next_rip\n\t" |
| "exp_next_rip:\n\t" ::: "eax", "edx"); |
| } |
| |
| static bool check_next_rip(struct svm_test *test) |
| { |
| extern char exp_next_rip; |
| unsigned long address = (unsigned long)&exp_next_rip; |
| |
| return address == vmcb->control.next_rip; |
| } |
| |
| extern u8 *msr_bitmap; |
| |
| static void prepare_msr_intercept(struct svm_test *test) |
| { |
| default_prepare(test); |
| vmcb->control.intercept |= (1ULL << INTERCEPT_MSR_PROT); |
| vmcb->control.intercept_exceptions |= (1ULL << GP_VECTOR); |
| memset(msr_bitmap, 0xff, MSR_BITMAP_SIZE); |
| } |
| |
| static void test_msr_intercept(struct svm_test *test) |
| { |
| unsigned long msr_value = 0xef8056791234abcd; /* Arbitrary value */ |
| unsigned long msr_index; |
| |
| for (msr_index = 0; msr_index <= 0xc0011fff; msr_index++) { |
| if (msr_index == 0xC0010131 /* MSR_SEV_STATUS */) { |
| /* |
| * Per section 15.34.10 "SEV_STATUS MSR" of AMD64 Architecture |
| * Programmer's Manual volume 2 - System Programming: |
| * http://support.amd.com/TechDocs/24593.pdf |
| * SEV_STATUS MSR (C001_0131) is a non-interceptable MSR. |
| */ |
| continue; |
| } |
| |
| /* Skips gaps between supported MSR ranges */ |
| if (msr_index == 0x2000) |
| msr_index = 0xc0000000; |
| else if (msr_index == 0xc0002000) |
| msr_index = 0xc0010000; |
| |
| test->scratch = -1; |
| |
| rdmsr(msr_index); |
| |
| /* Check that a read intercept occurred for MSR at msr_index */ |
| if (test->scratch != msr_index) |
| report_fail("MSR 0x%lx read intercept", msr_index); |
| |
| /* |
| * Poor man approach to generate a value that |
| * seems arbitrary each time around the loop. |
| */ |
| msr_value += (msr_value << 1); |
| |
| wrmsr(msr_index, msr_value); |
| |
| /* Check that a write intercept occurred for MSR with msr_value */ |
| if (test->scratch != msr_value) |
| report_fail("MSR 0x%lx write intercept", msr_index); |
| } |
| |
| test->scratch = -2; |
| } |
| |
| static bool msr_intercept_finished(struct svm_test *test) |
| { |
| u32 exit_code = vmcb->control.exit_code; |
| u64 exit_info_1; |
| u8 *opcode; |
| |
| if (exit_code == SVM_EXIT_MSR) { |
| exit_info_1 = vmcb->control.exit_info_1; |
| } else { |
| /* |
| * If #GP exception occurs instead, check that it was |
| * for RDMSR/WRMSR and set exit_info_1 accordingly. |
| */ |
| |
| if (exit_code != (SVM_EXIT_EXCP_BASE + GP_VECTOR)) |
| return true; |
| |
| opcode = (u8 *)vmcb->save.rip; |
| if (opcode[0] != 0x0f) |
| return true; |
| |
| switch (opcode[1]) { |
| case 0x30: /* WRMSR */ |
| exit_info_1 = 1; |
| break; |
| case 0x32: /* RDMSR */ |
| exit_info_1 = 0; |
| break; |
| default: |
| return true; |
| } |
| |
| /* |
| * Warn that #GP exception occurred instead. |
| * RCX holds the MSR index. |
| */ |
| printf("%s 0x%lx #GP exception\n", |
| exit_info_1 ? "WRMSR" : "RDMSR", get_regs().rcx); |
| } |
| |
| /* Jump over RDMSR/WRMSR instruction */ |
| vmcb->save.rip += 2; |
| |
| /* |
| * Test whether the intercept was for RDMSR/WRMSR. |
| * For RDMSR, test->scratch is set to the MSR index; |
| * RCX holds the MSR index. |
| * For WRMSR, test->scratch is set to the MSR value; |
| * RDX holds the upper 32 bits of the MSR value, |
| * while RAX hold its lower 32 bits. |
| */ |
| if (exit_info_1) |
| test->scratch = |
| ((get_regs().rdx << 32) | (vmcb->save.rax & 0xffffffff)); |
| else |
| test->scratch = get_regs().rcx; |
| |
| return false; |
| } |
| |
| static bool check_msr_intercept(struct svm_test *test) |
| { |
| memset(msr_bitmap, 0, MSR_BITMAP_SIZE); |
| return (test->scratch == -2); |
| } |
| |
| static void prepare_mode_switch(struct svm_test *test) |
| { |
| vmcb->control.intercept_exceptions |= (1ULL << GP_VECTOR) |
| | (1ULL << UD_VECTOR) |
| | (1ULL << DF_VECTOR) |
| | (1ULL << PF_VECTOR); |
| test->scratch = 0; |
| } |
| |
| static void test_mode_switch(struct svm_test *test) |
| { |
| asm volatile(" cli\n" |
| " ljmp *1f\n" /* jump to 32-bit code segment */ |
| "1:\n" |
| " .long 2f\n" |
| " .long " xstr(KERNEL_CS32) "\n" |
| ".code32\n" |
| "2:\n" |
| " movl %%cr0, %%eax\n" |
| " btcl $31, %%eax\n" /* clear PG */ |
| " movl %%eax, %%cr0\n" |
| " movl $0xc0000080, %%ecx\n" /* EFER */ |
| " rdmsr\n" |
| " btcl $8, %%eax\n" /* clear LME */ |
| " wrmsr\n" |
| " movl %%cr4, %%eax\n" |
| " btcl $5, %%eax\n" /* clear PAE */ |
| " movl %%eax, %%cr4\n" |
| " movw %[ds16], %%ax\n" |
| " movw %%ax, %%ds\n" |
| " ljmpl %[cs16], $3f\n" /* jump to 16 bit protected-mode */ |
| ".code16\n" |
| "3:\n" |
| " movl %%cr0, %%eax\n" |
| " btcl $0, %%eax\n" /* clear PE */ |
| " movl %%eax, %%cr0\n" |
| " ljmpl $0, $4f\n" /* jump to real-mode */ |
| "4:\n" |
| " vmmcall\n" |
| " movl %%cr0, %%eax\n" |
| " btsl $0, %%eax\n" /* set PE */ |
| " movl %%eax, %%cr0\n" |
| " ljmpl %[cs32], $5f\n" /* back to protected mode */ |
| ".code32\n" |
| "5:\n" |
| " movl %%cr4, %%eax\n" |
| " btsl $5, %%eax\n" /* set PAE */ |
| " movl %%eax, %%cr4\n" |
| " movl $0xc0000080, %%ecx\n" /* EFER */ |
| " rdmsr\n" |
| " btsl $8, %%eax\n" /* set LME */ |
| " wrmsr\n" |
| " movl %%cr0, %%eax\n" |
| " btsl $31, %%eax\n" /* set PG */ |
| " movl %%eax, %%cr0\n" |
| " ljmpl %[cs64], $6f\n" /* back to long mode */ |
| ".code64\n\t" |
| "6:\n" |
| " vmmcall\n" |
| :: [cs16] "i"(KERNEL_CS16), [ds16] "i"(KERNEL_DS16), |
| [cs32] "i"(KERNEL_CS32), [cs64] "i"(KERNEL_CS64) |
| : "rax", "rbx", "rcx", "rdx", "memory"); |
| } |
| |
| static bool mode_switch_finished(struct svm_test *test) |
| { |
| u64 cr0, cr4, efer; |
| |
| cr0 = vmcb->save.cr0; |
| cr4 = vmcb->save.cr4; |
| efer = vmcb->save.efer; |
| |
| /* Only expect VMMCALL intercepts */ |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) |
| return true; |
| |
| /* Jump over VMMCALL instruction */ |
| vmcb->save.rip += 3; |
| |
| /* Do sanity checks */ |
| switch (test->scratch) { |
| case 0: |
| /* Test should be in real mode now - check for this */ |
| if ((cr0 & 0x80000001) || /* CR0.PG, CR0.PE */ |
| (cr4 & 0x00000020) || /* CR4.PAE */ |
| (efer & 0x00000500)) /* EFER.LMA, EFER.LME */ |
| return true; |
| break; |
| case 2: |
| /* Test should be back in long-mode now - check for this */ |
| if (((cr0 & 0x80000001) != 0x80000001) || /* CR0.PG, CR0.PE */ |
| ((cr4 & 0x00000020) != 0x00000020) || /* CR4.PAE */ |
| ((efer & 0x00000500) != 0x00000500)) /* EFER.LMA, EFER.LME */ |
| return true; |
| break; |
| } |
| |
| /* one step forward */ |
| test->scratch += 1; |
| |
| return test->scratch == 2; |
| } |
| |
| static bool check_mode_switch(struct svm_test *test) |
| { |
| return test->scratch == 2; |
| } |
| |
| extern u8 *io_bitmap; |
| |
| static void prepare_ioio(struct svm_test *test) |
| { |
| vmcb->control.intercept |= (1ULL << INTERCEPT_IOIO_PROT); |
| test->scratch = 0; |
| memset(io_bitmap, 0, 8192); |
| io_bitmap[8192] = 0xFF; |
| } |
| |
| static void test_ioio(struct svm_test *test) |
| { |
| // stage 0, test IO pass |
| inb(0x5000); |
| outb(0x0, 0x5000); |
| if (get_test_stage(test) != 0) |
| goto fail; |
| |
| // test IO width, in/out |
| io_bitmap[0] = 0xFF; |
| inc_test_stage(test); |
| inb(0x0); |
| if (get_test_stage(test) != 2) |
| goto fail; |
| |
| outw(0x0, 0x0); |
| if (get_test_stage(test) != 3) |
| goto fail; |
| |
| inl(0x0); |
| if (get_test_stage(test) != 4) |
| goto fail; |
| |
| // test low/high IO port |
| io_bitmap[0x5000 / 8] = (1 << (0x5000 % 8)); |
| inb(0x5000); |
| if (get_test_stage(test) != 5) |
| goto fail; |
| |
| io_bitmap[0x9000 / 8] = (1 << (0x9000 % 8)); |
| inw(0x9000); |
| if (get_test_stage(test) != 6) |
| goto fail; |
| |
| // test partial pass |
| io_bitmap[0x5000 / 8] = (1 << (0x5000 % 8)); |
| inl(0x4FFF); |
| if (get_test_stage(test) != 7) |
| goto fail; |
| |
| // test across pages |
| inc_test_stage(test); |
| inl(0x7FFF); |
| if (get_test_stage(test) != 8) |
| goto fail; |
| |
| inc_test_stage(test); |
| io_bitmap[0x8000 / 8] = 1 << (0x8000 % 8); |
| inl(0x7FFF); |
| if (get_test_stage(test) != 10) |
| goto fail; |
| |
| io_bitmap[0] = 0; |
| inl(0xFFFF); |
| if (get_test_stage(test) != 11) |
| goto fail; |
| |
| io_bitmap[0] = 0xFF; |
| io_bitmap[8192] = 0; |
| inl(0xFFFF); |
| inc_test_stage(test); |
| if (get_test_stage(test) != 12) |
| goto fail; |
| |
| return; |
| |
| fail: |
| report_fail("stage %d", get_test_stage(test)); |
| test->scratch = -1; |
| } |
| |
| static bool ioio_finished(struct svm_test *test) |
| { |
| unsigned port, size; |
| |
| /* Only expect IOIO intercepts */ |
| if (vmcb->control.exit_code == SVM_EXIT_VMMCALL) |
| return true; |
| |
| if (vmcb->control.exit_code != SVM_EXIT_IOIO) |
| return true; |
| |
| /* one step forward */ |
| test->scratch += 1; |
| |
| port = vmcb->control.exit_info_1 >> 16; |
| size = (vmcb->control.exit_info_1 >> SVM_IOIO_SIZE_SHIFT) & 7; |
| |
| while (size--) { |
| io_bitmap[port / 8] &= ~(1 << (port & 7)); |
| port++; |
| } |
| |
| return false; |
| } |
| |
| static bool check_ioio(struct svm_test *test) |
| { |
| memset(io_bitmap, 0, 8193); |
| return test->scratch != -1; |
| } |
| |
| static void prepare_asid_zero(struct svm_test *test) |
| { |
| vmcb->control.asid = 0; |
| } |
| |
| static void test_asid_zero(struct svm_test *test) |
| { |
| asm volatile ("vmmcall\n\t"); |
| } |
| |
| static bool check_asid_zero(struct svm_test *test) |
| { |
| return vmcb->control.exit_code == SVM_EXIT_ERR; |
| } |
| |
| static void sel_cr0_bug_prepare(struct svm_test *test) |
| { |
| vmcb->control.intercept |= (1ULL << INTERCEPT_SELECTIVE_CR0); |
| } |
| |
| static bool sel_cr0_bug_finished(struct svm_test *test) |
| { |
| return true; |
| } |
| |
| static void sel_cr0_bug_test(struct svm_test *test) |
| { |
| unsigned long cr0; |
| |
| /* read cr0, clear CD, and write back */ |
| cr0 = read_cr0(); |
| cr0 |= (1UL << 30); |
| write_cr0(cr0); |
| |
| /* |
| * If we are here the test failed, not sure what to do now because we |
| * are not in guest-mode anymore so we can't trigger an intercept. |
| * Trigger a tripple-fault for now. |
| */ |
| report_fail("sel_cr0 test. Can not recover from this - exiting"); |
| exit(report_summary()); |
| } |
| |
| static bool sel_cr0_bug_check(struct svm_test *test) |
| { |
| return vmcb->control.exit_code == SVM_EXIT_CR0_SEL_WRITE; |
| } |
| |
| #define TSC_ADJUST_VALUE (1ll << 32) |
| #define TSC_OFFSET_VALUE (~0ull << 48) |
| static bool ok; |
| |
| static bool tsc_adjust_supported(void) |
| { |
| return this_cpu_has(X86_FEATURE_TSC_ADJUST); |
| } |
| |
| static void tsc_adjust_prepare(struct svm_test *test) |
| { |
| default_prepare(test); |
| vmcb->control.tsc_offset = TSC_OFFSET_VALUE; |
| |
| wrmsr(MSR_IA32_TSC_ADJUST, -TSC_ADJUST_VALUE); |
| int64_t adjust = rdmsr(MSR_IA32_TSC_ADJUST); |
| ok = adjust == -TSC_ADJUST_VALUE; |
| } |
| |
| static void tsc_adjust_test(struct svm_test *test) |
| { |
| int64_t adjust = rdmsr(MSR_IA32_TSC_ADJUST); |
| ok &= adjust == -TSC_ADJUST_VALUE; |
| |
| uint64_t l1_tsc = rdtsc() - TSC_OFFSET_VALUE; |
| wrmsr(MSR_IA32_TSC, l1_tsc - TSC_ADJUST_VALUE); |
| |
| adjust = rdmsr(MSR_IA32_TSC_ADJUST); |
| ok &= adjust <= -2 * TSC_ADJUST_VALUE; |
| |
| uint64_t l1_tsc_end = rdtsc() - TSC_OFFSET_VALUE; |
| ok &= (l1_tsc_end + TSC_ADJUST_VALUE - l1_tsc) < TSC_ADJUST_VALUE; |
| |
| uint64_t l1_tsc_msr = rdmsr(MSR_IA32_TSC) - TSC_OFFSET_VALUE; |
| ok &= (l1_tsc_msr + TSC_ADJUST_VALUE - l1_tsc) < TSC_ADJUST_VALUE; |
| } |
| |
| static bool tsc_adjust_check(struct svm_test *test) |
| { |
| int64_t adjust = rdmsr(MSR_IA32_TSC_ADJUST); |
| |
| wrmsr(MSR_IA32_TSC_ADJUST, 0); |
| return ok && adjust <= -2 * TSC_ADJUST_VALUE; |
| } |
| |
| |
| static u64 guest_tsc_delay_value; |
| /* number of bits to shift tsc right for stable result */ |
| #define TSC_SHIFT 24 |
| #define TSC_SCALE_ITERATIONS 10 |
| |
| static void svm_tsc_scale_guest(struct svm_test *test) |
| { |
| u64 start_tsc = rdtsc(); |
| |
| while (rdtsc() - start_tsc < guest_tsc_delay_value) |
| cpu_relax(); |
| } |
| |
| static void svm_tsc_scale_run_testcase(u64 duration, |
| double tsc_scale, u64 tsc_offset) |
| { |
| u64 start_tsc, actual_duration; |
| |
| guest_tsc_delay_value = (duration << TSC_SHIFT) * tsc_scale; |
| |
| test_set_guest(svm_tsc_scale_guest); |
| vmcb->control.tsc_offset = tsc_offset; |
| wrmsr(MSR_AMD64_TSC_RATIO, (u64)(tsc_scale * (1ULL << 32))); |
| |
| start_tsc = rdtsc(); |
| |
| if (svm_vmrun() != SVM_EXIT_VMMCALL) |
| report_fail("unexpected vm exit code 0x%x", vmcb->control.exit_code); |
| |
| actual_duration = (rdtsc() - start_tsc) >> TSC_SHIFT; |
| |
| report(duration == actual_duration, "tsc delay (expected: %lu, actual: %lu)", |
| duration, actual_duration); |
| } |
| |
| static void svm_tsc_scale_test(void) |
| { |
| int i; |
| |
| if (!tsc_scale_supported()) { |
| report_skip("TSC scale not supported in the guest"); |
| return; |
| } |
| |
| report(rdmsr(MSR_AMD64_TSC_RATIO) == TSC_RATIO_DEFAULT, |
| "initial TSC scale ratio"); |
| |
| for (i = 0 ; i < TSC_SCALE_ITERATIONS; i++) { |
| |
| double tsc_scale = (double)(rdrand() % 100 + 1) / 10; |
| int duration = rdrand() % 50 + 1; |
| u64 tsc_offset = rdrand(); |
| |
| report_info("duration=%d, tsc_scale=%d, tsc_offset=%ld", |
| duration, (int)(tsc_scale * 100), tsc_offset); |
| |
| svm_tsc_scale_run_testcase(duration, tsc_scale, tsc_offset); |
| } |
| |
| svm_tsc_scale_run_testcase(50, 255, rdrand()); |
| svm_tsc_scale_run_testcase(50, 0.0001, rdrand()); |
| } |
| |
| static void latency_prepare(struct svm_test *test) |
| { |
| default_prepare(test); |
| runs = LATENCY_RUNS; |
| latvmrun_min = latvmexit_min = -1ULL; |
| latvmrun_max = latvmexit_max = 0; |
| vmrun_sum = vmexit_sum = 0; |
| tsc_start = rdtsc(); |
| } |
| |
| static void latency_test(struct svm_test *test) |
| { |
| u64 cycles; |
| |
| start: |
| tsc_end = rdtsc(); |
| |
| cycles = tsc_end - tsc_start; |
| |
| if (cycles > latvmrun_max) |
| latvmrun_max = cycles; |
| |
| if (cycles < latvmrun_min) |
| latvmrun_min = cycles; |
| |
| vmrun_sum += cycles; |
| |
| tsc_start = rdtsc(); |
| |
| asm volatile ("vmmcall" : : : "memory"); |
| goto start; |
| } |
| |
| static bool latency_finished(struct svm_test *test) |
| { |
| u64 cycles; |
| |
| tsc_end = rdtsc(); |
| |
| cycles = tsc_end - tsc_start; |
| |
| if (cycles > latvmexit_max) |
| latvmexit_max = cycles; |
| |
| if (cycles < latvmexit_min) |
| latvmexit_min = cycles; |
| |
| vmexit_sum += cycles; |
| |
| vmcb->save.rip += 3; |
| |
| runs -= 1; |
| |
| tsc_end = rdtsc(); |
| |
| return runs == 0; |
| } |
| |
| static bool latency_finished_clean(struct svm_test *test) |
| { |
| vmcb->control.clean = VMCB_CLEAN_ALL; |
| return latency_finished(test); |
| } |
| |
| static bool latency_check(struct svm_test *test) |
| { |
| printf(" Latency VMRUN : max: %ld min: %ld avg: %ld\n", latvmrun_max, |
| latvmrun_min, vmrun_sum / LATENCY_RUNS); |
| printf(" Latency VMEXIT: max: %ld min: %ld avg: %ld\n", latvmexit_max, |
| latvmexit_min, vmexit_sum / LATENCY_RUNS); |
| return true; |
| } |
| |
| static void lat_svm_insn_prepare(struct svm_test *test) |
| { |
| default_prepare(test); |
| runs = LATENCY_RUNS; |
| latvmload_min = latvmsave_min = latstgi_min = latclgi_min = -1ULL; |
| latvmload_max = latvmsave_max = latstgi_max = latclgi_max = 0; |
| vmload_sum = vmsave_sum = stgi_sum = clgi_sum; |
| } |
| |
| static bool lat_svm_insn_finished(struct svm_test *test) |
| { |
| u64 vmcb_phys = virt_to_phys(vmcb); |
| u64 cycles; |
| |
| for ( ; runs != 0; runs--) { |
| tsc_start = rdtsc(); |
| asm volatile("vmload %0\n\t" : : "a"(vmcb_phys) : "memory"); |
| cycles = rdtsc() - tsc_start; |
| if (cycles > latvmload_max) |
| latvmload_max = cycles; |
| if (cycles < latvmload_min) |
| latvmload_min = cycles; |
| vmload_sum += cycles; |
| |
| tsc_start = rdtsc(); |
| asm volatile("vmsave %0\n\t" : : "a"(vmcb_phys) : "memory"); |
| cycles = rdtsc() - tsc_start; |
| if (cycles > latvmsave_max) |
| latvmsave_max = cycles; |
| if (cycles < latvmsave_min) |
| latvmsave_min = cycles; |
| vmsave_sum += cycles; |
| |
| tsc_start = rdtsc(); |
| asm volatile("stgi\n\t"); |
| cycles = rdtsc() - tsc_start; |
| if (cycles > latstgi_max) |
| latstgi_max = cycles; |
| if (cycles < latstgi_min) |
| latstgi_min = cycles; |
| stgi_sum += cycles; |
| |
| tsc_start = rdtsc(); |
| asm volatile("clgi\n\t"); |
| cycles = rdtsc() - tsc_start; |
| if (cycles > latclgi_max) |
| latclgi_max = cycles; |
| if (cycles < latclgi_min) |
| latclgi_min = cycles; |
| clgi_sum += cycles; |
| } |
| |
| tsc_end = rdtsc(); |
| |
| return true; |
| } |
| |
| static bool lat_svm_insn_check(struct svm_test *test) |
| { |
| printf(" Latency VMLOAD: max: %ld min: %ld avg: %ld\n", latvmload_max, |
| latvmload_min, vmload_sum / LATENCY_RUNS); |
| printf(" Latency VMSAVE: max: %ld min: %ld avg: %ld\n", latvmsave_max, |
| latvmsave_min, vmsave_sum / LATENCY_RUNS); |
| printf(" Latency STGI: max: %ld min: %ld avg: %ld\n", latstgi_max, |
| latstgi_min, stgi_sum / LATENCY_RUNS); |
| printf(" Latency CLGI: max: %ld min: %ld avg: %ld\n", latclgi_max, |
| latclgi_min, clgi_sum / LATENCY_RUNS); |
| return true; |
| } |
| |
| /* |
| * Report failures from SVM guest code, and on failure, set the stage to -1 and |
| * do VMMCALL to terminate the test (host side must treat -1 as "finished"). |
| * TODO: fix the tests that don't play nice with a straight report, e.g. the |
| * V_TPR test fails if report() is invoked. |
| */ |
| #define report_svm_guest(cond, test, fmt, args...) \ |
| do { \ |
| if (!(cond)) { \ |
| report_fail(fmt, ##args); \ |
| set_test_stage(test, -1); \ |
| vmmcall(); \ |
| } \ |
| } while (0) |
| |
| bool pending_event_ipi_fired; |
| bool pending_event_guest_run; |
| |
| static void pending_event_ipi_isr(isr_regs_t *regs) |
| { |
| pending_event_ipi_fired = true; |
| eoi(); |
| } |
| |
| static void pending_event_prepare(struct svm_test *test) |
| { |
| int ipi_vector = 0xf1; |
| |
| default_prepare(test); |
| |
| pending_event_ipi_fired = false; |
| |
| handle_irq(ipi_vector, pending_event_ipi_isr); |
| |
| pending_event_guest_run = false; |
| |
| vmcb->control.intercept |= (1ULL << INTERCEPT_INTR); |
| vmcb->control.int_ctl |= V_INTR_MASKING_MASK; |
| |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | |
| APIC_DM_FIXED | ipi_vector, 0); |
| |
| set_test_stage(test, 0); |
| } |
| |
| static void pending_event_test(struct svm_test *test) |
| { |
| pending_event_guest_run = true; |
| } |
| |
| static bool pending_event_finished(struct svm_test *test) |
| { |
| switch (get_test_stage(test)) { |
| case 0: |
| if (vmcb->control.exit_code != SVM_EXIT_INTR) { |
| report_fail("VMEXIT not due to pending interrupt. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_INTR); |
| vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK; |
| |
| if (pending_event_guest_run) { |
| report_fail("Guest ran before host received IPI\n"); |
| return true; |
| } |
| |
| sti_nop_cli(); |
| |
| if (!pending_event_ipi_fired) { |
| report_fail("Pending interrupt not dispatched after IRQ enabled\n"); |
| return true; |
| } |
| break; |
| |
| case 1: |
| if (!pending_event_guest_run) { |
| report_fail("Guest did not resume when no interrupt\n"); |
| return true; |
| } |
| break; |
| } |
| |
| inc_test_stage(test); |
| |
| return get_test_stage(test) == 2; |
| } |
| |
| static bool pending_event_check(struct svm_test *test) |
| { |
| return get_test_stage(test) == 2; |
| } |
| |
| static void pending_event_cli_prepare(struct svm_test *test) |
| { |
| default_prepare(test); |
| |
| pending_event_ipi_fired = false; |
| |
| handle_irq(0xf1, pending_event_ipi_isr); |
| |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | |
| APIC_DM_FIXED | 0xf1, 0); |
| |
| set_test_stage(test, 0); |
| } |
| |
| static void pending_event_cli_prepare_gif_clear(struct svm_test *test) |
| { |
| asm("cli"); |
| } |
| |
| static void pending_event_cli_test(struct svm_test *test) |
| { |
| report_svm_guest(!pending_event_ipi_fired, test, |
| "IRQ should NOT be delivered while IRQs disabled"); |
| |
| /* VINTR_MASKING is zero. This should cause the IPI to fire. */ |
| sti_nop_cli(); |
| |
| report_svm_guest(pending_event_ipi_fired, test, |
| "IRQ should be delivered after enabling IRQs"); |
| vmmcall(); |
| |
| /* |
| * Now VINTR_MASKING=1, but no interrupt is pending so |
| * the VINTR interception should be clear in VMCB02. Check |
| * that L0 did not leave a stale VINTR in the VMCB. |
| */ |
| sti_nop_cli(); |
| } |
| |
| static bool pending_event_cli_finished(struct svm_test *test) |
| { |
| report_svm_guest(vmcb->control.exit_code == SVM_EXIT_VMMCALL, test, |
| "Wanted VMMCALL VM-Exit, got exit reason 0x%x", |
| vmcb->control.exit_code); |
| |
| switch (get_test_stage(test)) { |
| case 0: |
| vmcb->save.rip += 3; |
| |
| pending_event_ipi_fired = false; |
| |
| vmcb->control.int_ctl |= V_INTR_MASKING_MASK; |
| |
| /* Now entering again with VINTR_MASKING=1. */ |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | |
| APIC_DM_FIXED | 0xf1, 0); |
| |
| break; |
| |
| case 1: |
| if (pending_event_ipi_fired == true) { |
| report_fail("Interrupt triggered by guest"); |
| return true; |
| } |
| |
| sti_nop_cli(); |
| |
| if (pending_event_ipi_fired != true) { |
| report_fail("Interrupt not triggered by host"); |
| return true; |
| } |
| |
| break; |
| |
| default: |
| return true; |
| } |
| |
| inc_test_stage(test); |
| |
| return get_test_stage(test) == 2; |
| } |
| |
| static bool pending_event_cli_check(struct svm_test *test) |
| { |
| return get_test_stage(test) == 2; |
| } |
| |
| #define TIMER_VECTOR 222 |
| |
| static volatile bool timer_fired; |
| |
| static void timer_isr(isr_regs_t *regs) |
| { |
| timer_fired = true; |
| apic_write(APIC_EOI, 0); |
| } |
| |
| static void interrupt_prepare(struct svm_test *test) |
| { |
| default_prepare(test); |
| handle_irq(TIMER_VECTOR, timer_isr); |
| timer_fired = false; |
| set_test_stage(test, 0); |
| } |
| |
| static void interrupt_test(struct svm_test *test) |
| { |
| long long start, loops; |
| |
| apic_setup_timer(TIMER_VECTOR, APIC_LVT_TIMER_PERIODIC); |
| sti(); |
| apic_start_timer(1); |
| |
| for (loops = 0; loops < 10000000 && !timer_fired; loops++) |
| asm volatile ("nop"); |
| |
| report_svm_guest(timer_fired, test, |
| "direct interrupt while running guest"); |
| |
| apic_stop_timer(); |
| cli(); |
| vmmcall(); |
| |
| timer_fired = false; |
| apic_start_timer(1); |
| for (loops = 0; loops < 10000000 && !timer_fired; loops++) |
| asm volatile ("nop"); |
| |
| report_svm_guest(timer_fired, test, |
| "intercepted interrupt while running guest"); |
| |
| sti(); |
| apic_stop_timer(); |
| cli(); |
| |
| timer_fired = false; |
| start = rdtsc(); |
| apic_start_timer(1000000); |
| safe_halt(); |
| |
| report_svm_guest(timer_fired, test, "direct interrupt + hlt"); |
| report(rdtsc() - start > 10000, "IRQ arrived after expected delay"); |
| |
| apic_stop_timer(); |
| cli(); |
| vmmcall(); |
| |
| timer_fired = false; |
| start = rdtsc(); |
| apic_start_timer(1000000); |
| asm volatile ("hlt"); |
| |
| report_svm_guest(timer_fired, test, "intercepted interrupt + hlt"); |
| report(rdtsc() - start > 10000, "IRQ arrived after expected delay"); |
| |
| apic_cleanup_timer(); |
| } |
| |
| static bool interrupt_finished(struct svm_test *test) |
| { |
| switch (get_test_stage(test)) { |
| case 0: |
| case 2: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| vmcb->save.rip += 3; |
| |
| vmcb->control.intercept |= (1ULL << INTERCEPT_INTR); |
| vmcb->control.int_ctl |= V_INTR_MASKING_MASK; |
| break; |
| |
| case 1: |
| case 3: |
| if (vmcb->control.exit_code != SVM_EXIT_INTR) { |
| report_fail("VMEXIT not due to intr intercept. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| |
| sti_nop_cli(); |
| |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_INTR); |
| vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK; |
| break; |
| |
| case 4: |
| break; |
| |
| default: |
| return true; |
| } |
| |
| inc_test_stage(test); |
| |
| return get_test_stage(test) == 5; |
| } |
| |
| static bool interrupt_check(struct svm_test *test) |
| { |
| return get_test_stage(test) == 5; |
| } |
| |
| static volatile bool nmi_fired; |
| |
| static void nmi_handler(struct ex_regs *regs) |
| { |
| nmi_fired = true; |
| } |
| |
| static void nmi_prepare(struct svm_test *test) |
| { |
| default_prepare(test); |
| nmi_fired = false; |
| handle_exception(NMI_VECTOR, nmi_handler); |
| set_test_stage(test, 0); |
| } |
| |
| static void nmi_test(struct svm_test *test) |
| { |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_NMI | APIC_INT_ASSERT, 0); |
| |
| report_svm_guest(nmi_fired, test, "direct NMI while running guest"); |
| |
| vmmcall(); |
| |
| nmi_fired = false; |
| |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_NMI | APIC_INT_ASSERT, 0); |
| |
| report_svm_guest(nmi_fired, test, "intercepted pending NMI delivered to guest"); |
| } |
| |
| static bool nmi_finished(struct svm_test *test) |
| { |
| switch (get_test_stage(test)) { |
| case 0: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| vmcb->save.rip += 3; |
| |
| vmcb->control.intercept |= (1ULL << INTERCEPT_NMI); |
| break; |
| |
| case 1: |
| if (vmcb->control.exit_code != SVM_EXIT_NMI) { |
| report_fail("VMEXIT not due to NMI intercept. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| |
| report_pass("NMI intercept while running guest"); |
| break; |
| |
| case 2: |
| break; |
| |
| default: |
| return true; |
| } |
| |
| inc_test_stage(test); |
| |
| return get_test_stage(test) == 3; |
| } |
| |
| static bool nmi_check(struct svm_test *test) |
| { |
| return get_test_stage(test) == 3; |
| } |
| |
| #define NMI_DELAY 100000000ULL |
| |
| static void nmi_message_thread(void *_test) |
| { |
| struct svm_test *test = _test; |
| |
| while (get_test_stage(test) != 1) |
| pause(); |
| |
| delay(NMI_DELAY); |
| |
| apic_icr_write(APIC_DEST_PHYSICAL | APIC_DM_NMI | APIC_INT_ASSERT, id_map[0]); |
| |
| while (get_test_stage(test) != 2) |
| pause(); |
| |
| delay(NMI_DELAY); |
| |
| apic_icr_write(APIC_DEST_PHYSICAL | APIC_DM_NMI | APIC_INT_ASSERT, id_map[0]); |
| } |
| |
| static void nmi_hlt_test(struct svm_test *test) |
| { |
| long long start; |
| |
| on_cpu_async(1, nmi_message_thread, test); |
| |
| start = rdtsc(); |
| |
| set_test_stage(test, 1); |
| |
| asm volatile ("hlt"); |
| |
| report_svm_guest(nmi_fired, test, "direct NMI + hlt"); |
| report(rdtsc() - start > NMI_DELAY, "direct NMI after expected delay"); |
| |
| nmi_fired = false; |
| |
| vmmcall(); |
| |
| start = rdtsc(); |
| |
| set_test_stage(test, 2); |
| |
| asm volatile ("hlt"); |
| |
| report_svm_guest(nmi_fired, test, "intercepted NMI + hlt"); |
| report(rdtsc() - start > NMI_DELAY, "intercepted NMI after expected delay"); |
| |
| set_test_stage(test, 3); |
| } |
| |
| static bool nmi_hlt_finished(struct svm_test *test) |
| { |
| switch (get_test_stage(test)) { |
| case 1: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| vmcb->save.rip += 3; |
| |
| vmcb->control.intercept |= (1ULL << INTERCEPT_NMI); |
| break; |
| |
| case 2: |
| if (vmcb->control.exit_code != SVM_EXIT_NMI) { |
| report_fail("VMEXIT not due to NMI intercept. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| |
| report_pass("NMI intercept while running guest"); |
| break; |
| |
| case 3: |
| break; |
| |
| default: |
| return true; |
| } |
| |
| return get_test_stage(test) == 3; |
| } |
| |
| static bool nmi_hlt_check(struct svm_test *test) |
| { |
| return get_test_stage(test) == 3; |
| } |
| |
| static void vnmi_prepare(struct svm_test *test) |
| { |
| nmi_prepare(test); |
| |
| /* |
| * Disable NMI interception to start. Enabling vNMI without |
| * intercepting "real" NMIs should result in an ERR VM-Exit. |
| */ |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_NMI); |
| vmcb->control.int_ctl = V_NMI_ENABLE_MASK; |
| vmcb->control.int_vector = NMI_VECTOR; |
| } |
| |
| static void vnmi_test(struct svm_test *test) |
| { |
| report_svm_guest(!nmi_fired, test, "No vNMI before injection"); |
| vmmcall(); |
| |
| report_svm_guest(nmi_fired, test, "vNMI delivered after injection"); |
| vmmcall(); |
| } |
| |
| static bool vnmi_finished(struct svm_test *test) |
| { |
| switch (get_test_stage(test)) { |
| case 0: |
| if (vmcb->control.exit_code != SVM_EXIT_ERR) { |
| report_fail("Wanted ERR VM-Exit, got 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| report(!nmi_fired, "vNMI enabled but NMI_INTERCEPT unset!"); |
| vmcb->control.intercept |= (1ULL << INTERCEPT_NMI); |
| vmcb->save.rip += 3; |
| break; |
| |
| case 1: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("Wanted VMMCALL VM-Exit, got 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| report(!nmi_fired, "vNMI with vector 2 not injected"); |
| vmcb->control.int_ctl |= V_NMI_PENDING_MASK; |
| vmcb->save.rip += 3; |
| break; |
| |
| case 2: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("Wanted VMMCALL VM-Exit, got 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| if (vmcb->control.int_ctl & V_NMI_BLOCKING_MASK) { |
| report_fail("V_NMI_BLOCKING_MASK not cleared on VMEXIT"); |
| return true; |
| } |
| report_pass("VNMI serviced"); |
| vmcb->save.rip += 3; |
| break; |
| |
| default: |
| return true; |
| } |
| |
| inc_test_stage(test); |
| |
| return get_test_stage(test) == 3; |
| } |
| |
| static bool vnmi_check(struct svm_test *test) |
| { |
| return get_test_stage(test) == 3; |
| } |
| |
| static volatile int count_exc = 0; |
| |
| static void my_isr(struct ex_regs *r) |
| { |
| count_exc++; |
| } |
| |
| static void exc_inject_prepare(struct svm_test *test) |
| { |
| default_prepare(test); |
| handle_exception(DE_VECTOR, my_isr); |
| handle_exception(NMI_VECTOR, my_isr); |
| } |
| |
| |
| static void exc_inject_test(struct svm_test *test) |
| { |
| asm volatile ("vmmcall\n\tvmmcall\n\t"); |
| } |
| |
| static bool exc_inject_finished(struct svm_test *test) |
| { |
| switch (get_test_stage(test)) { |
| case 0: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| vmcb->save.rip += 3; |
| vmcb->control.event_inj = NMI_VECTOR | SVM_EVTINJ_TYPE_EXEPT | SVM_EVTINJ_VALID; |
| break; |
| |
| case 1: |
| if (vmcb->control.exit_code != SVM_EXIT_ERR) { |
| report_fail("VMEXIT not due to error. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| report(count_exc == 0, "exception with vector 2 not injected"); |
| vmcb->control.event_inj = DE_VECTOR | SVM_EVTINJ_TYPE_EXEPT | SVM_EVTINJ_VALID; |
| break; |
| |
| case 2: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| vmcb->save.rip += 3; |
| report(count_exc == 1, "divide overflow exception injected"); |
| report(!(vmcb->control.event_inj & SVM_EVTINJ_VALID), "eventinj.VALID cleared"); |
| break; |
| |
| default: |
| return true; |
| } |
| |
| inc_test_stage(test); |
| |
| return get_test_stage(test) == 3; |
| } |
| |
| static bool exc_inject_check(struct svm_test *test) |
| { |
| return count_exc == 1 && get_test_stage(test) == 3; |
| } |
| |
| static volatile bool virq_fired; |
| |
| static void virq_isr(isr_regs_t *regs) |
| { |
| virq_fired = true; |
| } |
| |
| static void virq_inject_prepare(struct svm_test *test) |
| { |
| handle_irq(0xf1, virq_isr); |
| default_prepare(test); |
| vmcb->control.int_ctl = V_INTR_MASKING_MASK | V_IRQ_MASK | |
| (0x0f << V_INTR_PRIO_SHIFT); // Set to the highest priority |
| vmcb->control.int_vector = 0xf1; |
| virq_fired = false; |
| set_test_stage(test, 0); |
| } |
| |
| static void virq_inject_test(struct svm_test *test) |
| { |
| report_svm_guest(!virq_fired, test, "virtual IRQ blocked after L2 cli"); |
| |
| sti_nop_cli(); |
| |
| report_svm_guest(virq_fired, test, "virtual IRQ fired after L2 sti"); |
| |
| vmmcall(); |
| |
| report_svm_guest(!virq_fired, test, "intercepted VINTR blocked after L2 cli"); |
| |
| sti_nop_cli(); |
| |
| report_svm_guest(virq_fired, test, "intercepted VINTR fired after L2 sti"); |
| |
| vmmcall(); |
| |
| sti_nop_cli(); |
| |
| report_svm_guest(!virq_fired, test, |
| "virtual IRQ blocked V_IRQ_PRIO less than V_TPR"); |
| |
| vmmcall(); |
| vmmcall(); |
| } |
| |
| static bool virq_inject_finished(struct svm_test *test) |
| { |
| vmcb->save.rip += 3; |
| |
| switch (get_test_stage(test)) { |
| case 0: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| if (vmcb->control.int_ctl & V_IRQ_MASK) { |
| report_fail("V_IRQ not cleared on VMEXIT after firing"); |
| return true; |
| } |
| virq_fired = false; |
| vmcb->control.intercept |= (1ULL << INTERCEPT_VINTR); |
| vmcb->control.int_ctl = V_INTR_MASKING_MASK | V_IRQ_MASK | |
| (0x0f << V_INTR_PRIO_SHIFT); |
| break; |
| |
| case 1: |
| if (vmcb->control.exit_code != SVM_EXIT_VINTR) { |
| report_fail("VMEXIT not due to vintr. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| if (virq_fired) { |
| report_fail("V_IRQ fired before SVM_EXIT_VINTR"); |
| return true; |
| } |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_VINTR); |
| break; |
| |
| case 2: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| virq_fired = false; |
| // Set irq to lower priority |
| vmcb->control.int_ctl = V_INTR_MASKING_MASK | V_IRQ_MASK | |
| (0x08 << V_INTR_PRIO_SHIFT); |
| // Raise guest TPR |
| vmcb->control.int_ctl |= 0x0a & V_TPR_MASK; |
| break; |
| |
| case 3: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| vmcb->control.intercept |= (1ULL << INTERCEPT_VINTR); |
| break; |
| |
| case 4: |
| // INTERCEPT_VINTR should be ignored because V_INTR_PRIO < V_TPR |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| break; |
| |
| default: |
| return true; |
| } |
| |
| inc_test_stage(test); |
| |
| return get_test_stage(test) == 5; |
| } |
| |
| static bool virq_inject_check(struct svm_test *test) |
| { |
| return get_test_stage(test) == 5; |
| } |
| |
| /* |
| * Detect nested guest RIP corruption as explained in kernel commit |
| * b6162e82aef19fee9c32cb3fe9ac30d9116a8c73 |
| * |
| * In the assembly loop below 'ins' is executed while IO instructions |
| * are not intercepted; the instruction is emulated by L0. |
| * |
| * At the same time we are getting interrupts from the local APIC timer, |
| * and we do intercept them in L1 |
| * |
| * If the interrupt happens on the insb instruction, L0 will VMexit, emulate |
| * the insb instruction and then it will inject the interrupt to L1 through |
| * a nested VMexit. Due to a bug, it would leave pre-emulation values of RIP, |
| * RAX and RSP in the VMCB. |
| * |
| * In our intercept handler we detect the bug by checking that RIP is that of |
| * the insb instruction, but its memory operand has already been written. |
| * This means that insb was already executed. |
| */ |
| |
| static volatile int isr_cnt = 0; |
| static volatile uint8_t io_port_var = 0xAA; |
| extern const char insb_instruction_label[]; |
| |
| static void reg_corruption_isr(isr_regs_t *regs) |
| { |
| isr_cnt++; |
| apic_write(APIC_EOI, 0); |
| } |
| |
| static void reg_corruption_prepare(struct svm_test *test) |
| { |
| default_prepare(test); |
| set_test_stage(test, 0); |
| |
| vmcb->control.int_ctl = V_INTR_MASKING_MASK; |
| vmcb->control.intercept |= (1ULL << INTERCEPT_INTR); |
| |
| handle_irq(TIMER_VECTOR, reg_corruption_isr); |
| |
| /* set local APIC to inject external interrupts */ |
| apic_setup_timer(TIMER_VECTOR, APIC_LVT_TIMER_PERIODIC); |
| apic_start_timer(1000); |
| } |
| |
| static void reg_corruption_test(struct svm_test *test) |
| { |
| /* this is endless loop, which is interrupted by the timer interrupt */ |
| asm volatile ( |
| "1:\n\t" |
| "movw $0x4d0, %%dx\n\t" // IO port |
| "lea %[io_port_var], %%rdi\n\t" |
| "movb $0xAA, %[io_port_var]\n\t" |
| "insb_instruction_label:\n\t" |
| "insb\n\t" |
| "jmp 1b\n\t" |
| |
| : [io_port_var] "=m" (io_port_var) |
| : /* no inputs*/ |
| : "rdx", "rdi" |
| ); |
| } |
| |
| static bool reg_corruption_finished(struct svm_test *test) |
| { |
| if (isr_cnt == 10000) { |
| report_pass("No RIP corruption detected after %d timer interrupts", |
| isr_cnt); |
| set_test_stage(test, 1); |
| goto cleanup; |
| } |
| |
| if (vmcb->control.exit_code == SVM_EXIT_INTR) { |
| |
| void* guest_rip = (void*)vmcb->save.rip; |
| |
| sti_nop_cli(); |
| |
| if (guest_rip == insb_instruction_label && io_port_var != 0xAA) { |
| report_fail("RIP corruption detected after %d timer interrupts", |
| isr_cnt); |
| goto cleanup; |
| } |
| |
| } |
| return false; |
| cleanup: |
| apic_cleanup_timer(); |
| return true; |
| |
| } |
| |
| static bool reg_corruption_check(struct svm_test *test) |
| { |
| return get_test_stage(test) == 1; |
| } |
| |
| static void get_tss_entry(void *data) |
| { |
| *((gdt_entry_t **)data) = get_tss_descr(); |
| } |
| |
| static int orig_cpu_count; |
| |
| static void init_startup_prepare(struct svm_test *test) |
| { |
| gdt_entry_t *tss_entry; |
| int i; |
| |
| on_cpu(1, get_tss_entry, &tss_entry); |
| |
| orig_cpu_count = atomic_read(&cpu_online_count); |
| |
| apic_icr_write(APIC_DEST_PHYSICAL | APIC_DM_INIT | APIC_INT_ASSERT, |
| id_map[1]); |
| |
| delay(100000000ULL); |
| |
| atomic_dec(&cpu_online_count); |
| |
| tss_entry->type &= ~DESC_BUSY; |
| |
| apic_icr_write(APIC_DEST_PHYSICAL | APIC_DM_STARTUP, id_map[1]); |
| |
| for (i = 0; i < 5 && atomic_read(&cpu_online_count) < orig_cpu_count; i++) |
| delay(100000000ULL); |
| } |
| |
| static bool init_startup_finished(struct svm_test *test) |
| { |
| return true; |
| } |
| |
| static bool init_startup_check(struct svm_test *test) |
| { |
| return atomic_read(&cpu_online_count) == orig_cpu_count; |
| } |
| |
| static volatile bool init_intercept; |
| |
| static void init_intercept_prepare(struct svm_test *test) |
| { |
| init_intercept = false; |
| vmcb->control.intercept |= (1ULL << INTERCEPT_INIT); |
| } |
| |
| static void init_intercept_test(struct svm_test *test) |
| { |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_INIT | APIC_INT_ASSERT, 0); |
| } |
| |
| static bool init_intercept_finished(struct svm_test *test) |
| { |
| vmcb->save.rip += 3; |
| |
| if (vmcb->control.exit_code != SVM_EXIT_INIT) { |
| report_fail("VMEXIT not due to init intercept. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| |
| return true; |
| } |
| |
| init_intercept = true; |
| |
| report_pass("INIT to vcpu intercepted"); |
| |
| return true; |
| } |
| |
| static bool init_intercept_check(struct svm_test *test) |
| { |
| return init_intercept; |
| } |
| |
| /* |
| * Setting host EFLAGS.TF causes a #DB trap after the VMRUN completes on the |
| * host side (i.e., after the #VMEXIT from the guest). |
| * |
| * Setting host EFLAGS.RF suppresses any potential instruction breakpoint |
| * match on the VMRUN and completion of the VMRUN instruction clears the |
| * host EFLAGS.RF bit. |
| * |
| * [AMD APM] |
| */ |
| static volatile u8 host_rflags_guest_main_flag = 0; |
| static volatile u8 host_rflags_db_handler_flag = 0; |
| static volatile bool host_rflags_ss_on_vmrun = false; |
| static volatile bool host_rflags_vmrun_reached = false; |
| static volatile bool host_rflags_set_tf = false; |
| static volatile bool host_rflags_set_rf = false; |
| static u64 rip_detected; |
| |
| extern u64 *vmrun_rip; |
| |
| static void host_rflags_db_handler(struct ex_regs *r) |
| { |
| if (host_rflags_ss_on_vmrun) { |
| if (host_rflags_vmrun_reached) { |
| if (!host_rflags_set_rf) { |
| r->rflags &= ~X86_EFLAGS_TF; |
| rip_detected = r->rip; |
| } else { |
| r->rflags |= X86_EFLAGS_RF; |
| ++host_rflags_db_handler_flag; |
| } |
| } else { |
| if (r->rip == (u64)&vmrun_rip) { |
| host_rflags_vmrun_reached = true; |
| |
| if (host_rflags_set_rf) { |
| host_rflags_guest_main_flag = 0; |
| rip_detected = r->rip; |
| r->rflags &= ~X86_EFLAGS_TF; |
| |
| /* Trigger #DB via debug registers */ |
| write_dr0((void *)&vmrun_rip); |
| write_dr7(0x403); |
| } |
| } |
| } |
| } else { |
| r->rflags &= ~X86_EFLAGS_TF; |
| } |
| } |
| |
| static void host_rflags_prepare(struct svm_test *test) |
| { |
| default_prepare(test); |
| handle_exception(DB_VECTOR, host_rflags_db_handler); |
| set_test_stage(test, 0); |
| } |
| |
| static void host_rflags_prepare_gif_clear(struct svm_test *test) |
| { |
| if (host_rflags_set_tf) |
| write_rflags(read_rflags() | X86_EFLAGS_TF); |
| } |
| |
| static void host_rflags_test(struct svm_test *test) |
| { |
| while (1) { |
| if (get_test_stage(test) > 0) { |
| if ((host_rflags_set_tf && !host_rflags_ss_on_vmrun && !host_rflags_db_handler_flag) || |
| (host_rflags_set_rf && host_rflags_db_handler_flag == 1)) |
| host_rflags_guest_main_flag = 1; |
| } |
| |
| if (get_test_stage(test) == 4) |
| break; |
| vmmcall(); |
| } |
| } |
| |
| static bool host_rflags_finished(struct svm_test *test) |
| { |
| switch (get_test_stage(test)) { |
| case 0: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("Unexpected VMEXIT. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| vmcb->save.rip += 3; |
| /* |
| * Setting host EFLAGS.TF not immediately before VMRUN, causes |
| * #DB trap before first guest instruction is executed |
| */ |
| host_rflags_set_tf = true; |
| break; |
| case 1: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL || |
| host_rflags_guest_main_flag != 1) { |
| report_fail("Unexpected VMEXIT or #DB handler" |
| " invoked before guest main. Exit reason 0x%x", |
| vmcb->control.exit_code); |
| return true; |
| } |
| vmcb->save.rip += 3; |
| /* |
| * Setting host EFLAGS.TF immediately before VMRUN, causes #DB |
| * trap after VMRUN completes on the host side (i.e., after |
| * VMEXIT from guest). |
| */ |
| host_rflags_ss_on_vmrun = true; |
| break; |
| case 2: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL || |
| rip_detected != (u64)&vmrun_rip + 3) { |
| report_fail("Unexpected VMEXIT or RIP mismatch." |
| " Exit reason 0x%x, RIP actual: %lx, RIP expected: " |
| "%lx", vmcb->control.exit_code, |
| (u64)&vmrun_rip + 3, rip_detected); |
| return true; |
| } |
| host_rflags_set_rf = true; |
| host_rflags_guest_main_flag = 0; |
| host_rflags_vmrun_reached = false; |
| vmcb->save.rip += 3; |
| break; |
| case 3: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL || |
| rip_detected != (u64)&vmrun_rip || |
| host_rflags_guest_main_flag != 1 || |
| host_rflags_db_handler_flag > 1 || |
| read_rflags() & X86_EFLAGS_RF) { |
| report_fail("Unexpected VMEXIT or RIP mismatch or " |
| "EFLAGS.RF not cleared." |
| " Exit reason 0x%x, RIP actual: %lx, RIP expected: " |
| "%lx", vmcb->control.exit_code, |
| (u64)&vmrun_rip, rip_detected); |
| return true; |
| } |
| host_rflags_set_tf = false; |
| host_rflags_set_rf = false; |
| vmcb->save.rip += 3; |
| break; |
| default: |
| return true; |
| } |
| inc_test_stage(test); |
| return get_test_stage(test) == 5; |
| } |
| |
| static bool host_rflags_check(struct svm_test *test) |
| { |
| return get_test_stage(test) == 4; |
| } |
| |
| #define TEST(name) { #name, .v2 = name } |
| |
| /* |
| * v2 tests |
| */ |
| |
| /* |
| * Ensure that kvm recalculates the L1 guest's CPUID.01H:ECX.OSXSAVE |
| * after VM-exit from an L2 guest that sets CR4.OSXSAVE to a different |
| * value than in L1. |
| */ |
| |
| static void svm_cr4_osxsave_test_guest(struct svm_test *test) |
| { |
| write_cr4(read_cr4() & ~X86_CR4_OSXSAVE); |
| } |
| |
| static void svm_cr4_osxsave_test(void) |
| { |
| if (!this_cpu_has(X86_FEATURE_XSAVE)) { |
| report_skip("XSAVE not detected"); |
| return; |
| } |
| |
| if (!(read_cr4() & X86_CR4_OSXSAVE)) { |
| unsigned long cr4 = read_cr4() | X86_CR4_OSXSAVE; |
| |
| write_cr4(cr4); |
| vmcb->save.cr4 = cr4; |
| } |
| |
| report(this_cpu_has(X86_FEATURE_OSXSAVE), "CPUID.01H:ECX.XSAVE set before VMRUN"); |
| |
| test_set_guest(svm_cr4_osxsave_test_guest); |
| report(svm_vmrun() == SVM_EXIT_VMMCALL, |
| "svm_cr4_osxsave_test_guest finished with VMMCALL"); |
| |
| report(this_cpu_has(X86_FEATURE_OSXSAVE), "CPUID.01H:ECX.XSAVE set after VMRUN"); |
| } |
| |
| static void basic_guest_main(struct svm_test *test) |
| { |
| } |
| |
| |
| #define SVM_TEST_REG_RESERVED_BITS(start, end, inc, str_name, reg, val, \ |
| resv_mask) \ |
| { \ |
| u64 tmp, mask; \ |
| int i; \ |
| \ |
| for (i = start; i <= end; i = i + inc) { \ |
| mask = 1ull << i; \ |
| if (!(mask & resv_mask)) \ |
| continue; \ |
| tmp = val | mask; \ |
| reg = tmp; \ |
| report(svm_vmrun() == SVM_EXIT_ERR, "Test %s %d:%d: %lx", \ |
| str_name, end, start, tmp); \ |
| } \ |
| } |
| |
| #define SVM_TEST_CR_RESERVED_BITS(start, end, inc, cr, val, resv_mask, \ |
| exit_code, test_name) \ |
| { \ |
| u64 tmp, mask; \ |
| u32 r; \ |
| int i; \ |
| \ |
| for (i = start; i <= end; i = i + inc) { \ |
| mask = 1ull << i; \ |
| if (!(mask & resv_mask)) \ |
| continue; \ |
| tmp = val | mask; \ |
| switch (cr) { \ |
| case 0: \ |
| vmcb->save.cr0 = tmp; \ |
| break; \ |
| case 3: \ |
| vmcb->save.cr3 = tmp; \ |
| break; \ |
| case 4: \ |
| vmcb->save.cr4 = tmp; \ |
| } \ |
| r = svm_vmrun(); \ |
| report(r == exit_code, "Test CR%d %s%d:%d: %lx, wanted exit 0x%x, got 0x%x", \ |
| cr, test_name, end, start, tmp, exit_code, r); \ |
| } \ |
| } |
| |
| static void test_efer(void) |
| { |
| /* |
| * Un-setting EFER.SVME is illegal |
| */ |
| u64 efer_saved = vmcb->save.efer; |
| u64 efer = efer_saved; |
| |
| report (svm_vmrun() == SVM_EXIT_VMMCALL, "EFER.SVME: %lx", efer); |
| efer &= ~EFER_SVME; |
| vmcb->save.efer = efer; |
| report (svm_vmrun() == SVM_EXIT_ERR, "EFER.SVME: %lx", efer); |
| vmcb->save.efer = efer_saved; |
| |
| /* |
| * EFER MBZ bits: 63:16, 9 |
| */ |
| efer_saved = vmcb->save.efer; |
| |
| SVM_TEST_REG_RESERVED_BITS(8, 9, 1, "EFER", vmcb->save.efer, |
| efer_saved, SVM_EFER_RESERVED_MASK); |
| SVM_TEST_REG_RESERVED_BITS(16, 63, 4, "EFER", vmcb->save.efer, |
| efer_saved, SVM_EFER_RESERVED_MASK); |
| |
| /* |
| * EFER.LME and CR0.PG are both set and CR4.PAE is zero. |
| */ |
| u64 cr0_saved = vmcb->save.cr0; |
| u64 cr0; |
| u64 cr4_saved = vmcb->save.cr4; |
| u64 cr4; |
| |
| efer = efer_saved | EFER_LME; |
| vmcb->save.efer = efer; |
| cr0 = cr0_saved | X86_CR0_PG | X86_CR0_PE; |
| vmcb->save.cr0 = cr0; |
| cr4 = cr4_saved & ~X86_CR4_PAE; |
| vmcb->save.cr4 = cr4; |
| report(svm_vmrun() == SVM_EXIT_ERR, "EFER.LME=1 (%lx), " |
| "CR0.PG=1 (%lx) and CR4.PAE=0 (%lx)", efer, cr0, cr4); |
| |
| /* |
| * EFER.LME and CR0.PG are both set and CR0.PE is zero. |
| * CR4.PAE needs to be set as we otherwise cannot |
| * determine if CR4.PAE=0 or CR0.PE=0 triggered the |
| * SVM_EXIT_ERR. |
| */ |
| cr4 = cr4_saved | X86_CR4_PAE; |
| vmcb->save.cr4 = cr4; |
| cr0 &= ~X86_CR0_PE; |
| vmcb->save.cr0 = cr0; |
| report(svm_vmrun() == SVM_EXIT_ERR, "EFER.LME=1 (%lx), " |
| "CR0.PG=1 and CR0.PE=0 (%lx)", efer, cr0); |
| |
| /* |
| * EFER.LME, CR0.PG, CR4.PAE, CS.L, and CS.D are all non-zero. |
| */ |
| u32 cs_attrib_saved = vmcb->save.cs.attrib; |
| u32 cs_attrib; |
| |
| cr0 |= X86_CR0_PE; |
| vmcb->save.cr0 = cr0; |
| cs_attrib = cs_attrib_saved | SVM_SELECTOR_L_MASK | |
| SVM_SELECTOR_DB_MASK; |
| vmcb->save.cs.attrib = cs_attrib; |
| report(svm_vmrun() == SVM_EXIT_ERR, "EFER.LME=1 (%lx), " |
| "CR0.PG=1 (%lx), CR4.PAE=1 (%lx), CS.L=1 and CS.D=1 (%x)", |
| efer, cr0, cr4, cs_attrib); |
| |
| vmcb->save.cr0 = cr0_saved; |
| vmcb->save.cr4 = cr4_saved; |
| vmcb->save.efer = efer_saved; |
| vmcb->save.cs.attrib = cs_attrib_saved; |
| } |
| |
| static void test_cr0(void) |
| { |
| /* |
| * Un-setting CR0.CD and setting CR0.NW is illegal combination |
| */ |
| u64 cr0_saved = vmcb->save.cr0; |
| u64 cr0 = cr0_saved; |
| |
| cr0 |= X86_CR0_CD; |
| cr0 &= ~X86_CR0_NW; |
| vmcb->save.cr0 = cr0; |
| report (svm_vmrun() == SVM_EXIT_VMMCALL, "Test CR0 CD=1,NW=0: %lx", |
| cr0); |
| cr0 |= X86_CR0_NW; |
| vmcb->save.cr0 = cr0; |
| report (svm_vmrun() == SVM_EXIT_VMMCALL, "Test CR0 CD=1,NW=1: %lx", |
| cr0); |
| cr0 &= ~X86_CR0_NW; |
| cr0 &= ~X86_CR0_CD; |
| vmcb->save.cr0 = cr0; |
| report (svm_vmrun() == SVM_EXIT_VMMCALL, "Test CR0 CD=0,NW=0: %lx", |
| cr0); |
| cr0 |= X86_CR0_NW; |
| vmcb->save.cr0 = cr0; |
| report (svm_vmrun() == SVM_EXIT_ERR, "Test CR0 CD=0,NW=1: %lx", |
| cr0); |
| vmcb->save.cr0 = cr0_saved; |
| |
| /* |
| * CR0[63:32] are not zero |
| */ |
| cr0 = cr0_saved; |
| |
| SVM_TEST_REG_RESERVED_BITS(32, 63, 4, "CR0", vmcb->save.cr0, cr0_saved, |
| SVM_CR0_RESERVED_MASK); |
| vmcb->save.cr0 = cr0_saved; |
| } |
| |
| static void test_cr3(void) |
| { |
| /* |
| * CR3 MBZ bits based on different modes: |
| * [63:52] - long mode |
| */ |
| u64 cr3_saved = vmcb->save.cr3; |
| |
| SVM_TEST_CR_RESERVED_BITS(0, 63, 1, 3, cr3_saved, |
| SVM_CR3_LONG_MBZ_MASK, SVM_EXIT_ERR, ""); |
| |
| vmcb->save.cr3 = cr3_saved & ~SVM_CR3_LONG_MBZ_MASK; |
| report(svm_vmrun() == SVM_EXIT_VMMCALL, "Test CR3 63:0: %lx", |
| vmcb->save.cr3); |
| |
| /* |
| * CR3 non-MBZ reserved bits based on different modes: |
| * [11:5] [2:0] - long mode (PCIDE=0) |
| * [2:0] - PAE legacy mode |
| */ |
| u64 cr4_saved = vmcb->save.cr4; |
| u64 *pdpe = npt_get_pml4e(); |
| |
| /* |
| * Long mode |
| */ |
| if (this_cpu_has(X86_FEATURE_PCID)) { |
| vmcb->save.cr4 = cr4_saved | X86_CR4_PCIDE; |
| SVM_TEST_CR_RESERVED_BITS(0, 11, 1, 3, cr3_saved, |
| SVM_CR3_LONG_RESERVED_MASK, SVM_EXIT_VMMCALL, "(PCIDE=1) "); |
| |
| vmcb->save.cr3 = cr3_saved & ~SVM_CR3_LONG_RESERVED_MASK; |
| report(svm_vmrun() == SVM_EXIT_VMMCALL, "Test CR3 63:0: %lx", |
| vmcb->save.cr3); |
| } |
| |
| vmcb->save.cr4 = cr4_saved & ~X86_CR4_PCIDE; |
| |
| if (!npt_supported()) |
| goto skip_npt_only; |
| |
| /* Clear P (Present) bit in NPT in order to trigger #NPF */ |
| pdpe[0] &= ~1ULL; |
| |
| SVM_TEST_CR_RESERVED_BITS(0, 11, 1, 3, cr3_saved, |
| SVM_CR3_LONG_RESERVED_MASK, SVM_EXIT_NPF, "(PCIDE=0) "); |
| |
| pdpe[0] |= 1ULL; |
| vmcb->save.cr3 = cr3_saved; |
| |
| /* |
| * PAE legacy |
| */ |
| pdpe[0] &= ~1ULL; |
| vmcb->save.cr4 = cr4_saved | X86_CR4_PAE; |
| SVM_TEST_CR_RESERVED_BITS(0, 2, 1, 3, cr3_saved, |
| SVM_CR3_PAE_LEGACY_RESERVED_MASK, SVM_EXIT_NPF, "(PAE) "); |
| |
| pdpe[0] |= 1ULL; |
| |
| skip_npt_only: |
| vmcb->save.cr3 = cr3_saved; |
| vmcb->save.cr4 = cr4_saved; |
| } |
| |
| /* Test CR4 MBZ bits based on legacy or long modes */ |
| static void test_cr4(void) |
| { |
| u64 cr4_saved = vmcb->save.cr4; |
| u64 efer_saved = vmcb->save.efer; |
| u64 efer = efer_saved; |
| |
| efer &= ~EFER_LME; |
| vmcb->save.efer = efer; |
| SVM_TEST_CR_RESERVED_BITS(12, 31, 1, 4, cr4_saved, |
| SVM_CR4_LEGACY_RESERVED_MASK, SVM_EXIT_ERR, ""); |
| |
| efer |= EFER_LME; |
| vmcb->save.efer = efer; |
| SVM_TEST_CR_RESERVED_BITS(12, 31, 1, 4, cr4_saved, |
| SVM_CR4_RESERVED_MASK, SVM_EXIT_ERR, ""); |
| SVM_TEST_CR_RESERVED_BITS(32, 63, 4, 4, cr4_saved, |
| SVM_CR4_RESERVED_MASK, SVM_EXIT_ERR, ""); |
| |
| vmcb->save.cr4 = cr4_saved; |
| vmcb->save.efer = efer_saved; |
| } |
| |
| static void test_dr(void) |
| { |
| /* |
| * DR6[63:32] and DR7[63:32] are MBZ |
| */ |
| u64 dr_saved = vmcb->save.dr6; |
| |
| SVM_TEST_REG_RESERVED_BITS(32, 63, 4, "DR6", vmcb->save.dr6, dr_saved, |
| SVM_DR6_RESERVED_MASK); |
| vmcb->save.dr6 = dr_saved; |
| |
| dr_saved = vmcb->save.dr7; |
| SVM_TEST_REG_RESERVED_BITS(32, 63, 4, "DR7", vmcb->save.dr7, dr_saved, |
| SVM_DR7_RESERVED_MASK); |
| |
| vmcb->save.dr7 = dr_saved; |
| } |
| |
| /* TODO: verify if high 32-bits are sign- or zero-extended on bare metal */ |
| #define TEST_BITMAP_ADDR(save_intercept, type, addr, exit_code, \ |
| msg) { \ |
| vmcb->control.intercept = saved_intercept | 1ULL << type; \ |
| if (type == INTERCEPT_MSR_PROT) \ |
| vmcb->control.msrpm_base_pa = addr; \ |
| else \ |
| vmcb->control.iopm_base_pa = addr; \ |
| report(svm_vmrun() == exit_code, \ |
| "Test %s address: %lx", msg, addr); \ |
| } |
| |
| /* |
| * If the MSR or IOIO intercept table extends to a physical address that |
| * is greater than or equal to the maximum supported physical address, the |
| * guest state is illegal. |
| * |
| * The VMRUN instruction ignores the lower 12 bits of the address specified |
| * in the VMCB. |
| * |
| * MSRPM spans 2 contiguous 4KB pages while IOPM spans 2 contiguous 4KB |
| * pages + 1 byte. |
| * |
| * [APM vol 2] |
| * |
| * Note: Unallocated MSRPM addresses conforming to consistency checks, generate |
| * #NPF. |
| */ |
| static void test_msrpm_iopm_bitmap_addrs(void) |
| { |
| u64 saved_intercept = vmcb->control.intercept; |
| u64 addr_beyond_limit = 1ull << cpuid_maxphyaddr(); |
| u64 addr = virt_to_phys(msr_bitmap) & (~((1ull << 12) - 1)); |
| |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_MSR_PROT, |
| addr_beyond_limit - 2 * PAGE_SIZE, SVM_EXIT_ERR, |
| "MSRPM"); |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_MSR_PROT, |
| addr_beyond_limit - 2 * PAGE_SIZE + 1, SVM_EXIT_ERR, |
| "MSRPM"); |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_MSR_PROT, |
| addr_beyond_limit - PAGE_SIZE, SVM_EXIT_ERR, |
| "MSRPM"); |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_MSR_PROT, addr, |
| SVM_EXIT_VMMCALL, "MSRPM"); |
| addr |= (1ull << 12) - 1; |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_MSR_PROT, addr, |
| SVM_EXIT_VMMCALL, "MSRPM"); |
| |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT, |
| addr_beyond_limit - 4 * PAGE_SIZE, SVM_EXIT_VMMCALL, |
| "IOPM"); |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT, |
| addr_beyond_limit - 3 * PAGE_SIZE, SVM_EXIT_VMMCALL, |
| "IOPM"); |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT, |
| addr_beyond_limit - 2 * PAGE_SIZE - 2, SVM_EXIT_VMMCALL, |
| "IOPM"); |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT, |
| addr_beyond_limit - 2 * PAGE_SIZE, SVM_EXIT_ERR, |
| "IOPM"); |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT, |
| addr_beyond_limit - PAGE_SIZE, SVM_EXIT_ERR, |
| "IOPM"); |
| addr = virt_to_phys(io_bitmap) & (~((1ull << 11) - 1)); |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT, addr, |
| SVM_EXIT_VMMCALL, "IOPM"); |
| addr |= (1ull << 12) - 1; |
| TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT, addr, |
| SVM_EXIT_VMMCALL, "IOPM"); |
| |
| vmcb->control.intercept = saved_intercept; |
| } |
| |
| /* |
| * Unlike VMSAVE, VMRUN seems not to update the value of noncanonical |
| * segment bases in the VMCB. However, VMENTRY succeeds as documented. |
| */ |
| #define TEST_CANONICAL_VMRUN(seg_base, msg) \ |
| saved_addr = seg_base; \ |
| seg_base = (seg_base & ((1ul << addr_limit) - 1)) | noncanonical_mask; \ |
| return_value = svm_vmrun(); \ |
| report(return_value == SVM_EXIT_VMMCALL, \ |
| "Successful VMRUN with noncanonical %s.base", msg); \ |
| seg_base = saved_addr; |
| |
| |
| #define TEST_CANONICAL_VMLOAD(seg_base, msg) \ |
| saved_addr = seg_base; \ |
| seg_base = (seg_base & ((1ul << addr_limit) - 1)) | noncanonical_mask; \ |
| asm volatile ("vmload %0" : : "a"(vmcb_phys) : "memory"); \ |
| asm volatile ("vmsave %0" : : "a"(vmcb_phys) : "memory"); \ |
| report(is_canonical(seg_base), \ |
| "Test %s.base for canonical form: %lx", msg, seg_base); \ |
| seg_base = saved_addr; |
| |
| static void test_canonicalization(void) |
| { |
| u64 saved_addr; |
| u64 return_value; |
| u64 addr_limit; |
| u64 vmcb_phys = virt_to_phys(vmcb); |
| |
| addr_limit = (this_cpu_has(X86_FEATURE_LA57)) ? 57 : 48; |
| u64 noncanonical_mask = NONCANONICAL & ~((1ul << addr_limit) - 1); |
| |
| TEST_CANONICAL_VMLOAD(vmcb->save.fs.base, "FS"); |
| TEST_CANONICAL_VMLOAD(vmcb->save.gs.base, "GS"); |
| TEST_CANONICAL_VMLOAD(vmcb->save.ldtr.base, "LDTR"); |
| TEST_CANONICAL_VMLOAD(vmcb->save.tr.base, "TR"); |
| TEST_CANONICAL_VMLOAD(vmcb->save.kernel_gs_base, "KERNEL GS"); |
| TEST_CANONICAL_VMRUN(vmcb->save.es.base, "ES"); |
| TEST_CANONICAL_VMRUN(vmcb->save.cs.base, "CS"); |
| TEST_CANONICAL_VMRUN(vmcb->save.ss.base, "SS"); |
| TEST_CANONICAL_VMRUN(vmcb->save.ds.base, "DS"); |
| TEST_CANONICAL_VMRUN(vmcb->save.gdtr.base, "GDTR"); |
| TEST_CANONICAL_VMRUN(vmcb->save.idtr.base, "IDTR"); |
| } |
| |
| /* |
| * When VMRUN loads a guest value of 1 in EFLAGS.TF, that value does not |
| * cause a trace trap between the VMRUN and the first guest instruction, but |
| * rather after completion of the first guest instruction. |
| * |
| * [APM vol 2] |
| */ |
| u64 guest_rflags_test_trap_rip; |
| |
| static void guest_rflags_test_db_handler(struct ex_regs *r) |
| { |
| guest_rflags_test_trap_rip = r->rip; |
| r->rflags &= ~X86_EFLAGS_TF; |
| } |
| |
| static void svm_guest_state_test(void) |
| { |
| test_set_guest(basic_guest_main); |
| test_efer(); |
| test_cr0(); |
| test_cr3(); |
| test_cr4(); |
| test_dr(); |
| test_msrpm_iopm_bitmap_addrs(); |
| test_canonicalization(); |
| } |
| |
| extern void guest_rflags_test_guest(struct svm_test *test); |
| extern u64 *insn2; |
| extern u64 *guest_end; |
| |
| asm("guest_rflags_test_guest:\n\t" |
| "push %rbp\n\t" |
| ".global insn2\n\t" |
| "insn2:\n\t" |
| "mov %rsp,%rbp\n\t" |
| "vmmcall\n\t" |
| "vmmcall\n\t" |
| ".global guest_end\n\t" |
| "guest_end:\n\t" |
| "vmmcall\n\t" |
| "pop %rbp\n\t" |
| "ret"); |
| |
| static void svm_test_singlestep(void) |
| { |
| handle_exception(DB_VECTOR, guest_rflags_test_db_handler); |
| |
| /* |
| * Trap expected after completion of first guest instruction |
| */ |
| vmcb->save.rflags |= X86_EFLAGS_TF; |
| report (__svm_vmrun((u64)guest_rflags_test_guest) == SVM_EXIT_VMMCALL && |
| guest_rflags_test_trap_rip == (u64)&insn2, |
| "Test EFLAGS.TF on VMRUN: trap expected after completion of first guest instruction"); |
| /* |
| * No trap expected |
| */ |
| guest_rflags_test_trap_rip = 0; |
| vmcb->save.rip += 3; |
| vmcb->save.rflags |= X86_EFLAGS_TF; |
| report (__svm_vmrun(vmcb->save.rip) == SVM_EXIT_VMMCALL && |
| guest_rflags_test_trap_rip == 0, "Test EFLAGS.TF on VMRUN: trap not expected"); |
| |
| /* |
| * Let guest finish execution |
| */ |
| vmcb->save.rip += 3; |
| report (__svm_vmrun(vmcb->save.rip) == SVM_EXIT_VMMCALL && |
| vmcb->save.rip == (u64)&guest_end, "Test EFLAGS.TF on VMRUN: guest execution completion"); |
| } |
| |
| static bool volatile svm_errata_reproduced = false; |
| static unsigned long volatile physical = 0; |
| |
| |
| /* |
| * |
| * Test the following errata: |
| * If the VMRUN/VMSAVE/VMLOAD are attempted by the nested guest, |
| * the CPU would first check the EAX against host reserved memory |
| * regions (so far only SMM_ADDR/SMM_MASK are known to cause it), |
| * and only then signal #VMexit |
| * |
| * Try to reproduce this by trying vmsave on each possible 4K aligned memory |
| * address in the low 4G where the SMM area has to reside. |
| */ |
| |
| static void gp_isr(struct ex_regs *r) |
| { |
| svm_errata_reproduced = true; |
| /* skip over the vmsave instruction*/ |
| r->rip += 3; |
| } |
| |
| static void svm_vmrun_errata_test(void) |
| { |
| unsigned long *last_page = NULL; |
| |
| handle_exception(GP_VECTOR, gp_isr); |
| |
| while (!svm_errata_reproduced) { |
| |
| unsigned long *page = alloc_pages(1); |
| |
| if (!page) { |
| report_pass("All guest memory tested, no bug found"); |
| break; |
| } |
| |
| physical = virt_to_phys(page); |
| |
| asm volatile ( |
| "mov %[_physical], %%rax\n\t" |
| "vmsave %%rax\n\t" |
| |
| : [_physical] "=m" (physical) |
| : /* no inputs*/ |
| : "rax" /*clobbers*/ |
| ); |
| |
| if (svm_errata_reproduced) { |
| report_fail("Got #GP exception - svm errata reproduced at 0x%lx", |
| physical); |
| break; |
| } |
| |
| *page = (unsigned long)last_page; |
| last_page = page; |
| } |
| |
| while (last_page) { |
| unsigned long *page = last_page; |
| last_page = (unsigned long *)*last_page; |
| free_pages_by_order(page, 1); |
| } |
| } |
| |
| static void vmload_vmsave_guest_main(struct svm_test *test) |
| { |
| u64 vmcb_phys = virt_to_phys(vmcb); |
| |
| asm volatile ("vmload %0" : : "a"(vmcb_phys)); |
| asm volatile ("vmsave %0" : : "a"(vmcb_phys)); |
| } |
| |
| static void svm_vmload_vmsave(void) |
| { |
| u32 intercept_saved = vmcb->control.intercept; |
| |
| test_set_guest(vmload_vmsave_guest_main); |
| |
| /* |
| * Disabling intercept for VMLOAD and VMSAVE doesn't cause |
| * respective #VMEXIT to host |
| */ |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMLOAD); |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMSAVE); |
| svm_vmrun(); |
| report(vmcb->control.exit_code == SVM_EXIT_VMMCALL, "Test " |
| "VMLOAD/VMSAVE intercept: Expected VMMCALL #VMEXIT"); |
| |
| /* |
| * Enabling intercept for VMLOAD and VMSAVE causes respective |
| * #VMEXIT to host |
| */ |
| vmcb->control.intercept |= (1ULL << INTERCEPT_VMLOAD); |
| svm_vmrun(); |
| report(vmcb->control.exit_code == SVM_EXIT_VMLOAD, "Test " |
| "VMLOAD/VMSAVE intercept: Expected VMLOAD #VMEXIT"); |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMLOAD); |
| vmcb->control.intercept |= (1ULL << INTERCEPT_VMSAVE); |
| svm_vmrun(); |
| report(vmcb->control.exit_code == SVM_EXIT_VMSAVE, "Test " |
| "VMLOAD/VMSAVE intercept: Expected VMSAVE #VMEXIT"); |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMSAVE); |
| svm_vmrun(); |
| report(vmcb->control.exit_code == SVM_EXIT_VMMCALL, "Test " |
| "VMLOAD/VMSAVE intercept: Expected VMMCALL #VMEXIT"); |
| |
| vmcb->control.intercept |= (1ULL << INTERCEPT_VMLOAD); |
| svm_vmrun(); |
| report(vmcb->control.exit_code == SVM_EXIT_VMLOAD, "Test " |
| "VMLOAD/VMSAVE intercept: Expected VMLOAD #VMEXIT"); |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMLOAD); |
| svm_vmrun(); |
| report(vmcb->control.exit_code == SVM_EXIT_VMMCALL, "Test " |
| "VMLOAD/VMSAVE intercept: Expected VMMCALL #VMEXIT"); |
| |
| vmcb->control.intercept |= (1ULL << INTERCEPT_VMSAVE); |
| svm_vmrun(); |
| report(vmcb->control.exit_code == SVM_EXIT_VMSAVE, "Test " |
| "VMLOAD/VMSAVE intercept: Expected VMSAVE #VMEXIT"); |
| vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMSAVE); |
| svm_vmrun(); |
| report(vmcb->control.exit_code == SVM_EXIT_VMMCALL, "Test " |
| "VMLOAD/VMSAVE intercept: Expected VMMCALL #VMEXIT"); |
| |
| vmcb->control.intercept = intercept_saved; |
| } |
| |
| static void prepare_vgif_enabled(struct svm_test *test) |
| { |
| default_prepare(test); |
| } |
| |
| static void test_vgif(struct svm_test *test) |
| { |
| asm volatile ("vmmcall\n\tstgi\n\tvmmcall\n\tclgi\n\tvmmcall\n\t"); |
| } |
| |
| static bool vgif_finished(struct svm_test *test) |
| { |
| switch (get_test_stage(test)) |
| { |
| case 0: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall."); |
| return true; |
| } |
| vmcb->control.int_ctl |= V_GIF_ENABLED_MASK; |
| vmcb->save.rip += 3; |
| inc_test_stage(test); |
| break; |
| case 1: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall."); |
| return true; |
| } |
| if (!(vmcb->control.int_ctl & V_GIF_MASK)) { |
| report_fail("Failed to set VGIF when executing STGI."); |
| vmcb->control.int_ctl &= ~V_GIF_ENABLED_MASK; |
| return true; |
| } |
| report_pass("STGI set VGIF bit."); |
| vmcb->save.rip += 3; |
| inc_test_stage(test); |
| break; |
| case 2: |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| report_fail("VMEXIT not due to vmmcall."); |
| return true; |
| } |
| if (vmcb->control.int_ctl & V_GIF_MASK) { |
| report_fail("Failed to clear VGIF when executing CLGI."); |
| vmcb->control.int_ctl &= ~V_GIF_ENABLED_MASK; |
| return true; |
| } |
| report_pass("CLGI cleared VGIF bit."); |
| vmcb->save.rip += 3; |
| inc_test_stage(test); |
| vmcb->control.int_ctl &= ~V_GIF_ENABLED_MASK; |
| break; |
| default: |
| return true; |
| break; |
| } |
| |
| return get_test_stage(test) == 3; |
| } |
| |
| static bool vgif_check(struct svm_test *test) |
| { |
| return get_test_stage(test) == 3; |
| } |
| |
| |
| static int pause_test_counter; |
| static int wait_counter; |
| |
| static void pause_filter_test_guest_main(struct svm_test *test) |
| { |
| int i; |
| for (i = 0 ; i < pause_test_counter ; i++) |
| pause(); |
| |
| if (!wait_counter) |
| return; |
| |
| for (i = 0; i < wait_counter; i++) |
| ; |
| |
| for (i = 0 ; i < pause_test_counter ; i++) |
| pause(); |
| |
| } |
| |
| static void pause_filter_run_test(int pause_iterations, int filter_value, int wait_iterations, int threshold) |
| { |
| test_set_guest(pause_filter_test_guest_main); |
| |
| pause_test_counter = pause_iterations; |
| wait_counter = wait_iterations; |
| |
| vmcb->control.pause_filter_count = filter_value; |
| vmcb->control.pause_filter_thresh = threshold; |
| svm_vmrun(); |
| |
| if (filter_value <= pause_iterations || wait_iterations < threshold) |
| report(vmcb->control.exit_code == SVM_EXIT_PAUSE, "expected PAUSE vmexit"); |
| else |
| report(vmcb->control.exit_code == SVM_EXIT_VMMCALL, "no expected PAUSE vmexit"); |
| } |
| |
| static void pause_filter_test(void) |
| { |
| if (!pause_filter_supported()) { |
| report_skip("PAUSE filter not supported in the guest"); |
| return; |
| } |
| |
| vmcb->control.intercept |= (1 << INTERCEPT_PAUSE); |
| |
| // filter count more that pause count - no VMexit |
| pause_filter_run_test(10, 9, 0, 0); |
| |
| // filter count smaller pause count - no VMexit |
| pause_filter_run_test(20, 21, 0, 0); |
| |
| |
| if (pause_threshold_supported()) { |
| // filter count smaller pause count - no VMexit + large enough threshold |
| // so that filter counter resets |
| pause_filter_run_test(20, 21, 1000, 10); |
| |
| // filter count smaller pause count - no VMexit + small threshold |
| // so that filter doesn't reset |
| pause_filter_run_test(20, 21, 10, 1000); |
| } else { |
| report_skip("PAUSE threshold not supported in the guest"); |
| return; |
| } |
| } |
| |
| /* If CR0.TS and CR0.EM are cleared in L2, no #NM is generated. */ |
| static void svm_no_nm_test(void) |
| { |
| write_cr0(read_cr0() & ~X86_CR0_TS); |
| test_set_guest((test_guest_func)fnop); |
| |
| vmcb->save.cr0 = vmcb->save.cr0 & ~(X86_CR0_TS | X86_CR0_EM); |
| report(svm_vmrun() == SVM_EXIT_VMMCALL, |
| "fnop with CR0.TS and CR0.EM unset no #NM exception"); |
| } |
| |
| static u64 amd_get_lbr_rip(u32 msr) |
| { |
| return rdmsr(msr) & ~AMD_LBR_RECORD_MISPREDICT; |
| } |
| |
| #define HOST_CHECK_LBR(from_expected, to_expected) \ |
| do { \ |
| TEST_EXPECT_EQ((u64)from_expected, amd_get_lbr_rip(MSR_IA32_LASTBRANCHFROMIP)); \ |
| TEST_EXPECT_EQ((u64)to_expected, amd_get_lbr_rip(MSR_IA32_LASTBRANCHTOIP)); \ |
| } while (0) |
| |
| /* |
| * FIXME: Do something other than generate an exception to communicate failure. |
| * Debugging without expected vs. actual is an absolute nightmare. |
| */ |
| #define GUEST_CHECK_LBR(from_expected, to_expected) \ |
| do { \ |
| if ((u64)(from_expected) != amd_get_lbr_rip(MSR_IA32_LASTBRANCHFROMIP)) \ |
| asm volatile("ud2"); \ |
| if ((u64)(to_expected) != amd_get_lbr_rip(MSR_IA32_LASTBRANCHTOIP)) \ |
| asm volatile("ud2"); \ |
| } while (0) |
| |
| #define REPORT_GUEST_LBR_ERROR(vmcb) \ |
| report(false, "LBR guest test failed. Exit reason 0x%x, RIP = %lx, from = %lx, to = %lx, ex from = %lx, ex to = %lx", \ |
| vmcb->control.exit_code, vmcb->save.rip, \ |
| vmcb->save.br_from, vmcb->save.br_to, \ |
| vmcb->save.last_excp_from, vmcb->save.last_excp_to) |
| |
| #define DO_BRANCH(branch_name) \ |
| asm volatile ( \ |
| # branch_name "_from:" \ |
| "jmp " # branch_name "_to\n" \ |
| "nop\n" \ |
| "nop\n" \ |
| # branch_name "_to:" \ |
| "nop\n" \ |
| ) |
| |
| |
| extern u64 guest_branch0_from, guest_branch0_to; |
| extern u64 guest_branch2_from, guest_branch2_to; |
| |
| extern u64 host_branch0_from, host_branch0_to; |
| extern u64 host_branch2_from, host_branch2_to; |
| extern u64 host_branch3_from, host_branch3_to; |
| extern u64 host_branch4_from, host_branch4_to; |
| |
| u64 dbgctl; |
| |
| static void svm_lbrv_test_guest1(void) |
| { |
| /* |
| * This guest expects the LBR to be already enabled when it starts, |
| * it does a branch, and then disables the LBR and then checks. |
| */ |
| |
| DO_BRANCH(guest_branch0); |
| |
| dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR); |
| wrmsr(MSR_IA32_DEBUGCTLMSR, 0); |
| |
| if (dbgctl != DEBUGCTLMSR_LBR) |
| asm volatile("ud2\n"); |
| if (rdmsr(MSR_IA32_DEBUGCTLMSR) != 0) |
| asm volatile("ud2\n"); |
| |
| GUEST_CHECK_LBR(&guest_branch0_from, &guest_branch0_to); |
| asm volatile ("vmmcall\n"); |
| } |
| |
| static void svm_lbrv_test_guest2(void) |
| { |
| /* |
| * This guest expects the LBR to be disabled when it starts, |
| * enables it, does a branch, disables it and then checks. |
| */ |
| |
| DO_BRANCH(guest_branch1); |
| dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR); |
| |
| if (dbgctl != 0) |
| asm volatile("ud2\n"); |
| |
| GUEST_CHECK_LBR(&host_branch2_from, &host_branch2_to); |
| |
| wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR); |
| dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR); |
| DO_BRANCH(guest_branch2); |
| wrmsr(MSR_IA32_DEBUGCTLMSR, 0); |
| |
| if (dbgctl != DEBUGCTLMSR_LBR) |
| asm volatile("ud2\n"); |
| GUEST_CHECK_LBR(&guest_branch2_from, &guest_branch2_to); |
| |
| asm volatile ("vmmcall\n"); |
| } |
| |
| static void svm_lbrv_test0(void) |
| { |
| report(true, "Basic LBR test"); |
| wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR); |
| DO_BRANCH(host_branch0); |
| dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR); |
| wrmsr(MSR_IA32_DEBUGCTLMSR, 0); |
| |
| TEST_EXPECT_EQ(dbgctl, DEBUGCTLMSR_LBR); |
| dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR); |
| TEST_EXPECT_EQ(dbgctl, 0); |
| |
| HOST_CHECK_LBR(&host_branch0_from, &host_branch0_to); |
| } |
| |
| static void svm_lbrv_test1(void) |
| { |
| report(true, "Test that without LBRV enabled, guest LBR state does 'leak' to the host(1)"); |
| |
| svm_setup_vmrun((u64)svm_lbrv_test_guest1); |
| vmcb->control.virt_ext = 0; |
| |
| wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR); |
| DO_BRANCH(host_branch1); |
| SVM_BARE_VMRUN; |
| dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR); |
| |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| REPORT_GUEST_LBR_ERROR(vmcb); |
| return; |
| } |
| |
| TEST_EXPECT_EQ(dbgctl, 0); |
| HOST_CHECK_LBR(&guest_branch0_from, &guest_branch0_to); |
| } |
| |
| static void svm_lbrv_test2(void) |
| { |
| report(true, "Test that without LBRV enabled, guest LBR state does 'leak' to the host(2)"); |
| |
| svm_setup_vmrun((u64)svm_lbrv_test_guest2); |
| vmcb->control.virt_ext = 0; |
| |
| wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR); |
| DO_BRANCH(host_branch2); |
| wrmsr(MSR_IA32_DEBUGCTLMSR, 0); |
| SVM_BARE_VMRUN; |
| dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR); |
| wrmsr(MSR_IA32_DEBUGCTLMSR, 0); |
| |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| REPORT_GUEST_LBR_ERROR(vmcb); |
| return; |
| } |
| |
| TEST_EXPECT_EQ(dbgctl, 0); |
| HOST_CHECK_LBR(&guest_branch2_from, &guest_branch2_to); |
| } |
| |
| static void svm_lbrv_nested_test1(void) |
| { |
| if (!lbrv_supported()) { |
| report_skip("LBRV not supported in the guest"); |
| return; |
| } |
| |
| report(true, "Test that with LBRV enabled, guest LBR state doesn't leak (1)"); |
| svm_setup_vmrun((u64)svm_lbrv_test_guest1); |
| vmcb->control.virt_ext = LBR_CTL_ENABLE_MASK; |
| vmcb->save.dbgctl = DEBUGCTLMSR_LBR; |
| |
| wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR); |
| DO_BRANCH(host_branch3); |
| SVM_BARE_VMRUN; |
| dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR); |
| wrmsr(MSR_IA32_DEBUGCTLMSR, 0); |
| |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| REPORT_GUEST_LBR_ERROR(vmcb); |
| return; |
| } |
| |
| if (vmcb->save.dbgctl != 0) { |
| report(false, "unexpected virtual guest MSR_IA32_DEBUGCTLMSR value 0x%lx", vmcb->save.dbgctl); |
| return; |
| } |
| |
| TEST_EXPECT_EQ(dbgctl, DEBUGCTLMSR_LBR); |
| HOST_CHECK_LBR(&host_branch3_from, &host_branch3_to); |
| } |
| |
| static void svm_lbrv_nested_test2(void) |
| { |
| if (!lbrv_supported()) { |
| report_skip("LBRV not supported in the guest"); |
| return; |
| } |
| |
| report(true, "Test that with LBRV enabled, guest LBR state doesn't leak (2)"); |
| svm_setup_vmrun((u64)svm_lbrv_test_guest2); |
| vmcb->control.virt_ext = LBR_CTL_ENABLE_MASK; |
| |
| vmcb->save.dbgctl = 0; |
| vmcb->save.br_from = (u64)&host_branch2_from; |
| vmcb->save.br_to = (u64)&host_branch2_to; |
| |
| wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR); |
| DO_BRANCH(host_branch4); |
| SVM_BARE_VMRUN; |
| dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR); |
| wrmsr(MSR_IA32_DEBUGCTLMSR, 0); |
| |
| if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) { |
| REPORT_GUEST_LBR_ERROR(vmcb); |
| return; |
| } |
| |
| TEST_EXPECT_EQ(dbgctl, DEBUGCTLMSR_LBR); |
| HOST_CHECK_LBR(&host_branch4_from, &host_branch4_to); |
| } |
| |
| |
| // test that a nested guest which does enable INTR interception |
| // but doesn't enable virtual interrupt masking works |
| |
| static volatile int dummy_isr_recevied; |
| static void dummy_isr(isr_regs_t *regs) |
| { |
| dummy_isr_recevied++; |
| eoi(); |
| } |
| |
| |
| static volatile int nmi_recevied; |
| static void dummy_nmi_handler(struct ex_regs *regs) |
| { |
| nmi_recevied++; |
| } |
| |
| |
| static void svm_intr_intercept_mix_run_guest(volatile int *counter, int expected_vmexit) |
| { |
| if (counter) |
| *counter = 0; |
| |
| sti(); // host IF value should not matter |
| clgi(); // vmrun will set back GI to 1 |
| |
| svm_vmrun(); |
| |
| if (counter) |
| report(!*counter, "No interrupt expected"); |
| |
| stgi(); |
| |
| if (counter) |
| report(*counter == 1, "Interrupt is expected"); |
| |
| report (vmcb->control.exit_code == expected_vmexit, "Test expected VM exit"); |
| report(vmcb->save.rflags & X86_EFLAGS_IF, "Guest should have EFLAGS.IF set now"); |
| cli(); |
| } |
| |
| |
| // subtest: test that enabling EFLAGS.IF is enough to trigger an interrupt |
| static void svm_intr_intercept_mix_if_guest(struct svm_test *test) |
| { |
| asm volatile("nop;nop;nop;nop"); |
| report(!dummy_isr_recevied, "No interrupt expected"); |
| sti_nop(); |
| report(0, "must not reach here"); |
| } |
| |
| static void svm_intr_intercept_mix_if(void) |
| { |
| // make a physical interrupt to be pending |
| handle_irq(0x55, dummy_isr); |
| |
| vmcb->control.intercept |= (1 << INTERCEPT_INTR); |
| vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK; |
| vmcb->save.rflags &= ~X86_EFLAGS_IF; |
| |
| test_set_guest(svm_intr_intercept_mix_if_guest); |
| cli(); |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_FIXED | 0x55, 0); |
| svm_intr_intercept_mix_run_guest(&dummy_isr_recevied, SVM_EXIT_INTR); |
| } |
| |
| |
| // subtest: test that a clever guest can trigger an interrupt by setting GIF |
| // if GIF is not intercepted |
| static void svm_intr_intercept_mix_gif_guest(struct svm_test *test) |
| { |
| |
| asm volatile("nop;nop;nop;nop"); |
| report(!dummy_isr_recevied, "No interrupt expected"); |
| |
| // clear GIF and enable IF |
| // that should still not cause VM exit |
| clgi(); |
| sti_nop(); |
| report(!dummy_isr_recevied, "No interrupt expected"); |
| |
| stgi(); |
| report(0, "must not reach here"); |
| } |
| |
| static void svm_intr_intercept_mix_gif(void) |
| { |
| handle_irq(0x55, dummy_isr); |
| |
| vmcb->control.intercept |= (1 << INTERCEPT_INTR); |
| vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK; |
| vmcb->save.rflags &= ~X86_EFLAGS_IF; |
| |
| test_set_guest(svm_intr_intercept_mix_gif_guest); |
| cli(); |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_FIXED | 0x55, 0); |
| svm_intr_intercept_mix_run_guest(&dummy_isr_recevied, SVM_EXIT_INTR); |
| } |
| |
| // subtest: test that a clever guest can trigger an interrupt by setting GIF |
| // if GIF is not intercepted and interrupt comes after guest |
| // started running |
| static void svm_intr_intercept_mix_gif_guest2(struct svm_test *test) |
| { |
| asm volatile("nop;nop;nop;nop"); |
| report(!dummy_isr_recevied, "No interrupt expected"); |
| |
| clgi(); |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_FIXED | 0x55, 0); |
| report(!dummy_isr_recevied, "No interrupt expected"); |
| |
| stgi(); |
| report(0, "must not reach here"); |
| } |
| |
| static void svm_intr_intercept_mix_gif2(void) |
| { |
| handle_irq(0x55, dummy_isr); |
| |
| vmcb->control.intercept |= (1 << INTERCEPT_INTR); |
| vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK; |
| vmcb->save.rflags |= X86_EFLAGS_IF; |
| |
| test_set_guest(svm_intr_intercept_mix_gif_guest2); |
| svm_intr_intercept_mix_run_guest(&dummy_isr_recevied, SVM_EXIT_INTR); |
| } |
| |
| |
| // subtest: test that pending NMI will be handled when guest enables GIF |
| static void svm_intr_intercept_mix_nmi_guest(struct svm_test *test) |
| { |
| asm volatile("nop;nop;nop;nop"); |
| report(!nmi_recevied, "No NMI expected"); |
| cli(); // should have no effect |
| |
| clgi(); |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_NMI, 0); |
| sti_nop(); // should have no effect |
| report(!nmi_recevied, "No NMI expected"); |
| |
| stgi(); |
| report(0, "must not reach here"); |
| } |
| |
| static void svm_intr_intercept_mix_nmi(void) |
| { |
| handle_exception(2, dummy_nmi_handler); |
| |
| vmcb->control.intercept |= (1 << INTERCEPT_NMI); |
| vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK; |
| vmcb->save.rflags |= X86_EFLAGS_IF; |
| |
| test_set_guest(svm_intr_intercept_mix_nmi_guest); |
| svm_intr_intercept_mix_run_guest(&nmi_recevied, SVM_EXIT_NMI); |
| } |
| |
| // test that pending SMI will be handled when guest enables GIF |
| // TODO: can't really count #SMIs so just test that guest doesn't hang |
| // and VMexits on SMI |
| static void svm_intr_intercept_mix_smi_guest(struct svm_test *test) |
| { |
| asm volatile("nop;nop;nop;nop"); |
| |
| clgi(); |
| apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_SMI, 0); |
| sti_nop(); // should have no effect |
| stgi(); |
| report(0, "must not reach here"); |
| } |
| |
| static void svm_intr_intercept_mix_smi(void) |
| { |
| vmcb->control |