diff options
| -rw-r--r-- | arch/x86/include/asm/kvm_emulate.h | 1 | ||||
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 3 | ||||
| -rw-r--r-- | arch/x86/kvm/emulate.c | 20 | ||||
| -rw-r--r-- | arch/x86/kvm/svm.c | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 45 |
5 files changed, 57 insertions, 14 deletions
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h index e9cd7befcb76..3e8c287090e4 100644 --- a/arch/x86/include/asm/kvm_emulate.h +++ b/arch/x86/include/asm/kvm_emulate.h @@ -441,5 +441,6 @@ int emulator_task_switch(struct x86_emulate_ctxt *ctxt, int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq); void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt); void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt); +bool emulator_can_use_gpa(struct x86_emulate_ctxt *ctxt); #endif /* _ASM_X86_KVM_X86_EMULATE_H */ diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 99a71d90b6ae..0419e114f27b 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -675,6 +675,9 @@ struct kvm_vcpu_arch { int pending_ioapic_eoi; int pending_external_vector; + + /* GPA available (AMD only) */ + bool gpa_available; }; struct kvm_lpage_info { diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 56628a44668b..2b8349a2b14b 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -173,6 +173,7 @@ #define NearBranch ((u64)1 << 52) /* Near branches */ #define No16 ((u64)1 << 53) /* No 16 bit operand */ #define IncSP ((u64)1 << 54) /* SP is incremented before ModRM calc */ +#define TwoMemOp ((u64)1 << 55) /* Instruction has two memory operand */ #define DstXacc (DstAccLo | SrcAccHi | SrcWrite) @@ -4256,7 +4257,7 @@ static const struct opcode group1[] = { }; static const struct opcode group1A[] = { - I(DstMem | SrcNone | Mov | Stack | IncSP, em_pop), N, N, N, N, N, N, N, + I(DstMem | SrcNone | Mov | Stack | IncSP | TwoMemOp, em_pop), N, N, N, N, N, N, N, }; static const struct opcode group2[] = { @@ -4294,7 +4295,7 @@ static const struct opcode group5[] = { I(SrcMemFAddr | ImplicitOps, em_call_far), I(SrcMem | NearBranch, em_jmp_abs), I(SrcMemFAddr | ImplicitOps, em_jmp_far), - I(SrcMem | Stack, em_push), D(Undefined), + I(SrcMem | Stack | TwoMemOp, em_push), D(Undefined), }; static const struct opcode group6[] = { @@ -4514,8 +4515,8 @@ static const struct opcode opcode_table[256] = { /* 0xA0 - 0xA7 */ I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov), I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov), - I2bv(SrcSI | DstDI | Mov | String, em_mov), - F2bv(SrcSI | DstDI | String | NoWrite, em_cmp_r), + I2bv(SrcSI | DstDI | Mov | String | TwoMemOp, em_mov), + F2bv(SrcSI | DstDI | String | NoWrite | TwoMemOp, em_cmp_r), /* 0xA8 - 0xAF */ F2bv(DstAcc | SrcImm | NoWrite, em_test), I2bv(SrcAcc | DstDI | Mov | String, em_mov), @@ -5629,3 +5630,14 @@ void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt) { writeback_registers(ctxt); } + +bool emulator_can_use_gpa(struct x86_emulate_ctxt *ctxt) +{ + if (ctxt->rep_prefix && (ctxt->d & String)) + return false; + + if (ctxt->d & TwoMemOp) + return false; + + return true; +} diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 08a4d3ab3455..d0414f054bdf 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -4182,6 +4182,8 @@ static int handle_exit(struct kvm_vcpu *vcpu) trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM); + vcpu->arch.gpa_available = (exit_code == SVM_EXIT_NPF); + if (!is_cr_intercept(svm, INTERCEPT_CR0_WRITE)) vcpu->arch.cr0 = svm->vmcb->save.cr0; if (npt_enabled) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c3ee5e29ea2a..edff19d1df97 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4462,6 +4462,21 @@ out: } EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system); +static int vcpu_is_mmio_gpa(struct kvm_vcpu *vcpu, unsigned long gva, + gpa_t gpa, bool write) +{ + /* For APIC access vmexit */ + if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) + return 1; + + if (vcpu_match_mmio_gpa(vcpu, gpa)) { + trace_vcpu_match_mmio(gva, gpa, write, true); + return 1; + } + + return 0; +} + static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, gpa_t *gpa, struct x86_exception *exception, bool write) @@ -4488,16 +4503,7 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, if (*gpa == UNMAPPED_GVA) return -1; - /* For APIC access vmexit */ - if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) - return 1; - - if (vcpu_match_mmio_gpa(vcpu, *gpa)) { - trace_vcpu_match_mmio(gva, *gpa, write, true); - return 1; - } - - return 0; + return vcpu_is_mmio_gpa(vcpu, gva, *gpa, write); } int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, @@ -4594,6 +4600,22 @@ static int emulator_read_write_onepage(unsigned long addr, void *val, int handled, ret; bool write = ops->write; struct kvm_mmio_fragment *frag; + struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; + + /* + * If the exit was due to a NPF we may already have a GPA. + * If the GPA is present, use it to avoid the GVA to GPA table walk. + * Note, this cannot be used on string operations since string + * operation using rep will only have the initial GPA from the NPF + * occurred. + */ + if (vcpu->arch.gpa_available && + emulator_can_use_gpa(ctxt) && + vcpu_is_mmio_gpa(vcpu, addr, exception->address, write) && + (addr & ~PAGE_MASK) == (exception->address & ~PAGE_MASK)) { + gpa = exception->address; + goto mmio; + } ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write); @@ -5610,6 +5632,9 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, } restart: + /* Save the faulting GPA (cr2) in the address field */ + ctxt->exception.address = cr2; + r = x86_emulate_insn(ctxt); if (r == EMULATION_INTERCEPTED) |