| #include "libcflat.h" |
| #include "vm.h" |
| #include "desc.h" |
| #include "alloc_page.h" |
| |
| #define KVM_HYPERCALL_INTEL ".byte 0x0f,0x01,0xc1" |
| #define KVM_HYPERCALL_AMD ".byte 0x0f,0x01,0xd9" |
| |
| static inline long kvm_hypercall0_intel(unsigned int nr) |
| { |
| long ret; |
| asm volatile(KVM_HYPERCALL_INTEL |
| : "=a"(ret) |
| : "a"(nr)); |
| return ret; |
| } |
| |
| static inline long kvm_hypercall0_amd(unsigned int nr) |
| { |
| long ret; |
| asm volatile(KVM_HYPERCALL_AMD |
| : "=a"(ret) |
| : "a"(nr)); |
| return ret; |
| } |
| |
| |
| volatile unsigned long test_rip; |
| #ifdef __x86_64__ |
| extern void gp_tss(void); |
| asm ("gp_tss: \n\t" |
| "add $8, %rsp\n\t" // discard error code |
| "popq test_rip(%rip)\n\t" // pop return address |
| "pushq %rsi\n\t" // new return address |
| "iretq\n\t" |
| "jmp gp_tss\n\t" |
| ); |
| |
| static inline int |
| test_edge(void) |
| { |
| test_rip = 0; |
| asm volatile ("movq $-1, %%rax\n\t" // prepare for vmcall |
| "leaq 1f(%%rip), %%rsi\n\t" // save return address for gp_tss |
| "movabsq $0x7ffffffffffd, %%rbx\n\t" |
| "jmp *%%rbx; 1:" : : : "rax", "rbx", "rsi"); |
| printf("Return from int 13, test_rip = %lx\n", test_rip); |
| return test_rip == (1ul << 47); |
| } |
| #endif |
| |
| int main(int ac, char **av) |
| { |
| kvm_hypercall0_intel(-1u); |
| printf("Hypercall via VMCALL: OK\n"); |
| kvm_hypercall0_amd(-1u); |
| printf("Hypercall via VMMCALL: OK\n"); |
| |
| #ifdef __x86_64__ |
| setup_vm(); |
| setup_idt(); |
| setup_alt_stack(); |
| set_intr_alt_stack(13, gp_tss); |
| |
| u8 *data1 = alloc_page(); |
| u8 *topmost = (void *) ((1ul << 47) - PAGE_SIZE); |
| |
| install_pte(phys_to_virt(read_cr3()), 1, topmost, |
| virt_to_phys(data1) | PT_PRESENT_MASK | PT_WRITABLE_MASK, 0); |
| memset(topmost, 0xcc, PAGE_SIZE); |
| topmost[4093] = 0x0f; |
| topmost[4094] = 0x01; |
| topmost[4095] = 0xc1; |
| report(test_edge(), |
| "VMCALL on edge of canonical address space (intel)"); |
| |
| topmost[4095] = 0xd9; |
| report(test_edge(), |
| "VMMCALL on edge of canonical address space (AMD)"); |
| #endif |
| |
| return report_summary(); |
| } |