| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef ASM_KVM_CACHE_REGS_H |
| #define ASM_KVM_CACHE_REGS_H |
| |
| #include <linux/kvm_host.h> |
| |
| #define KVM_POSSIBLE_CR0_GUEST_BITS (X86_CR0_TS | X86_CR0_WP) |
| #define KVM_POSSIBLE_CR4_GUEST_BITS \ |
| (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \ |
| | X86_CR4_OSXMMEXCPT | X86_CR4_PGE | X86_CR4_TSD | X86_CR4_FSGSBASE) |
| |
| #define X86_CR0_PDPTR_BITS (X86_CR0_CD | X86_CR0_NW | X86_CR0_PG) |
| #define X86_CR4_TLBFLUSH_BITS (X86_CR4_PGE | X86_CR4_PCIDE | X86_CR4_PAE | X86_CR4_SMEP) |
| #define X86_CR4_PDPTR_BITS (X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_SMEP) |
| |
| static_assert(!(KVM_POSSIBLE_CR0_GUEST_BITS & X86_CR0_PDPTR_BITS)); |
| |
| #define BUILD_KVM_GPR_ACCESSORS(lname, uname) \ |
| static __always_inline unsigned long kvm_##lname##_read(struct kvm_vcpu *vcpu)\ |
| { \ |
| return vcpu->arch.regs[VCPU_REGS_##uname]; \ |
| } \ |
| static __always_inline void kvm_##lname##_write(struct kvm_vcpu *vcpu, \ |
| unsigned long val) \ |
| { \ |
| vcpu->arch.regs[VCPU_REGS_##uname] = val; \ |
| } |
| BUILD_KVM_GPR_ACCESSORS(rax, RAX) |
| BUILD_KVM_GPR_ACCESSORS(rbx, RBX) |
| BUILD_KVM_GPR_ACCESSORS(rcx, RCX) |
| BUILD_KVM_GPR_ACCESSORS(rdx, RDX) |
| BUILD_KVM_GPR_ACCESSORS(rbp, RBP) |
| BUILD_KVM_GPR_ACCESSORS(rsi, RSI) |
| BUILD_KVM_GPR_ACCESSORS(rdi, RDI) |
| #ifdef CONFIG_X86_64 |
| BUILD_KVM_GPR_ACCESSORS(r8, R8) |
| BUILD_KVM_GPR_ACCESSORS(r9, R9) |
| BUILD_KVM_GPR_ACCESSORS(r10, R10) |
| BUILD_KVM_GPR_ACCESSORS(r11, R11) |
| BUILD_KVM_GPR_ACCESSORS(r12, R12) |
| BUILD_KVM_GPR_ACCESSORS(r13, R13) |
| BUILD_KVM_GPR_ACCESSORS(r14, R14) |
| BUILD_KVM_GPR_ACCESSORS(r15, R15) |
| #endif |
| |
| /* |
| * avail dirty |
| * 0 0 register in VMCS/VMCB |
| * 0 1 *INVALID* |
| * 1 0 register in vcpu->arch |
| * 1 1 register in vcpu->arch, needs to be stored back |
| */ |
| static inline bool kvm_register_is_available(struct kvm_vcpu *vcpu, |
| enum kvm_reg reg) |
| { |
| return test_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); |
| } |
| |
| static inline bool kvm_register_is_dirty(struct kvm_vcpu *vcpu, |
| enum kvm_reg reg) |
| { |
| return test_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty); |
| } |
| |
| static inline void kvm_register_mark_available(struct kvm_vcpu *vcpu, |
| enum kvm_reg reg) |
| { |
| __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); |
| } |
| |
| static inline void kvm_register_mark_dirty(struct kvm_vcpu *vcpu, |
| enum kvm_reg reg) |
| { |
| __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); |
| __set_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty); |
| } |
| |
| /* |
| * kvm_register_test_and_mark_available() is a special snowflake that uses an |
| * arch bitop directly to avoid the explicit instrumentation that comes with |
| * the generic bitops. This allows code that cannot be instrumented (noinstr |
| * functions), e.g. the low level VM-Enter/VM-Exit paths, to cache registers. |
| */ |
| static __always_inline bool kvm_register_test_and_mark_available(struct kvm_vcpu *vcpu, |
| enum kvm_reg reg) |
| { |
| return arch___test_and_set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); |
| } |
| |
| /* |
| * The "raw" register helpers are only for cases where the full 64 bits of a |
| * register are read/written irrespective of current vCPU mode. In other words, |
| * odds are good you shouldn't be using the raw variants. |
| */ |
| static inline unsigned long kvm_register_read_raw(struct kvm_vcpu *vcpu, int reg) |
| { |
| if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS)) |
| return 0; |
| |
| if (!kvm_register_is_available(vcpu, reg)) |
| static_call(kvm_x86_cache_reg)(vcpu, reg); |
| |
| return vcpu->arch.regs[reg]; |
| } |
| |
| static inline void kvm_register_write_raw(struct kvm_vcpu *vcpu, int reg, |
| unsigned long val) |
| { |
| if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS)) |
| return; |
| |
| vcpu->arch.regs[reg] = val; |
| kvm_register_mark_dirty(vcpu, reg); |
| } |
| |
| static inline unsigned long kvm_rip_read(struct kvm_vcpu *vcpu) |
| { |
| return kvm_register_read_raw(vcpu, VCPU_REGS_RIP); |
| } |
| |
| static inline void kvm_rip_write(struct kvm_vcpu *vcpu, unsigned long val) |
| { |
| kvm_register_write_raw(vcpu, VCPU_REGS_RIP, val); |
| } |
| |
| static inline unsigned long kvm_rsp_read(struct kvm_vcpu *vcpu) |
| { |
| return kvm_register_read_raw(vcpu, VCPU_REGS_RSP); |
| } |
| |
| static inline void kvm_rsp_write(struct kvm_vcpu *vcpu, unsigned long val) |
| { |
| kvm_register_write_raw(vcpu, VCPU_REGS_RSP, val); |
| } |
| |
| static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index) |
| { |
| might_sleep(); /* on svm */ |
| |
| if (!kvm_register_is_available(vcpu, VCPU_EXREG_PDPTR)) |
| static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_PDPTR); |
| |
| return vcpu->arch.walk_mmu->pdptrs[index]; |
| } |
| |
| static inline void kvm_pdptr_write(struct kvm_vcpu *vcpu, int index, u64 value) |
| { |
| vcpu->arch.walk_mmu->pdptrs[index] = value; |
| } |
| |
| static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask) |
| { |
| ulong tmask = mask & KVM_POSSIBLE_CR0_GUEST_BITS; |
| if ((tmask & vcpu->arch.cr0_guest_owned_bits) && |
| !kvm_register_is_available(vcpu, VCPU_EXREG_CR0)) |
| static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_CR0); |
| return vcpu->arch.cr0 & mask; |
| } |
| |
| static __always_inline bool kvm_is_cr0_bit_set(struct kvm_vcpu *vcpu, |
| unsigned long cr0_bit) |
| { |
| BUILD_BUG_ON(!is_power_of_2(cr0_bit)); |
| |
| return !!kvm_read_cr0_bits(vcpu, cr0_bit); |
| } |
| |
| static inline ulong kvm_read_cr0(struct kvm_vcpu *vcpu) |
| { |
| return kvm_read_cr0_bits(vcpu, ~0UL); |
| } |
| |
| static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask) |
| { |
| ulong tmask = mask & KVM_POSSIBLE_CR4_GUEST_BITS; |
| if ((tmask & vcpu->arch.cr4_guest_owned_bits) && |
| !kvm_register_is_available(vcpu, VCPU_EXREG_CR4)) |
| static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_CR4); |
| return vcpu->arch.cr4 & mask; |
| } |
| |
| static __always_inline bool kvm_is_cr4_bit_set(struct kvm_vcpu *vcpu, |
| unsigned long cr4_bit) |
| { |
| BUILD_BUG_ON(!is_power_of_2(cr4_bit)); |
| |
| return !!kvm_read_cr4_bits(vcpu, cr4_bit); |
| } |
| |
| static inline ulong kvm_read_cr3(struct kvm_vcpu *vcpu) |
| { |
| if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3)) |
| static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_CR3); |
| return vcpu->arch.cr3; |
| } |
| |
| static inline ulong kvm_read_cr4(struct kvm_vcpu *vcpu) |
| { |
| return kvm_read_cr4_bits(vcpu, ~0UL); |
| } |
| |
| static inline u64 kvm_read_edx_eax(struct kvm_vcpu *vcpu) |
| { |
| return (kvm_rax_read(vcpu) & -1u) |
| | ((u64)(kvm_rdx_read(vcpu) & -1u) << 32); |
| } |
| |
| static inline void enter_guest_mode(struct kvm_vcpu *vcpu) |
| { |
| vcpu->arch.hflags |= HF_GUEST_MASK; |
| vcpu->stat.guest_mode = 1; |
| } |
| |
| static inline void leave_guest_mode(struct kvm_vcpu *vcpu) |
| { |
| vcpu->arch.hflags &= ~HF_GUEST_MASK; |
| |
| if (vcpu->arch.load_eoi_exitmap_pending) { |
| vcpu->arch.load_eoi_exitmap_pending = false; |
| kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu); |
| } |
| |
| vcpu->stat.guest_mode = 0; |
| } |
| |
| static inline bool is_guest_mode(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->arch.hflags & HF_GUEST_MASK; |
| } |
| |
| #endif |
