From 59200273c4d07ddf99dd3c8d91b90bb170457fc3 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Mon, 25 Jan 2010 19:47:02 +0200 Subject: [PATCH] KVM: Trace failed msr reads and writes Record failed msrs reads and writes, and the fact that they failed as well. Signed-off-by: Avi Kivity Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/svm.c | 13 ++++++++----- arch/x86/kvm/trace.h | 17 +++++++++++------ arch/x86/kvm/vmx.c | 5 +++-- 3 files changed, 22 insertions(+), 13 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 9596cc86..52f78dd 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -2177,9 +2177,10 @@ static int rdmsr_interception(struct vcpu_svm *svm) u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX]; u64 data; - if (svm_get_msr(&svm->vcpu, ecx, &data)) + if (svm_get_msr(&svm->vcpu, ecx, &data)) { + trace_kvm_msr_read_ex(ecx); kvm_inject_gp(&svm->vcpu, 0); - else { + } else { trace_kvm_msr_read(ecx, data); svm->vcpu.arch.regs[VCPU_REGS_RAX] = data & 0xffffffff; @@ -2271,13 +2272,15 @@ static int wrmsr_interception(struct vcpu_svm *svm) u64 data = (svm->vcpu.arch.regs[VCPU_REGS_RAX] & -1u) | ((u64)(svm->vcpu.arch.regs[VCPU_REGS_RDX] & -1u) << 32); - trace_kvm_msr_write(ecx, data); svm->next_rip = kvm_rip_read(&svm->vcpu) + 2; - if (svm_set_msr(&svm->vcpu, ecx, data)) + if (svm_set_msr(&svm->vcpu, ecx, data)) { + trace_kvm_msr_write_ex(ecx, data); kvm_inject_gp(&svm->vcpu, 0); - else + } else { + trace_kvm_msr_write(ecx, data); skip_emulated_instruction(&svm->vcpu); + } return 1; } diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h index 45903a9..6ad30a2 100644 --- a/arch/x86/kvm/trace.h +++ b/arch/x86/kvm/trace.h @@ -246,28 +246,33 @@ TRACE_EVENT(kvm_page_fault, * Tracepoint for guest MSR access. */ TRACE_EVENT(kvm_msr, - TP_PROTO(unsigned write, u32 ecx, u64 data), - TP_ARGS(write, ecx, data), + TP_PROTO(unsigned write, u32 ecx, u64 data, bool exception), + TP_ARGS(write, ecx, data, exception), TP_STRUCT__entry( __field( unsigned, write ) __field( u32, ecx ) __field( u64, data ) + __field( u8, exception ) ), TP_fast_assign( __entry->write = write; __entry->ecx = ecx; __entry->data = data; + __entry->exception = exception; ), - TP_printk("msr_%s %x = 0x%llx", + TP_printk("msr_%s %x = 0x%llx%s", __entry->write ? "write" : "read", - __entry->ecx, __entry->data) + __entry->ecx, __entry->data, + __entry->exception ? " (#GP)" : "") ); -#define trace_kvm_msr_read(ecx, data) trace_kvm_msr(0, ecx, data) -#define trace_kvm_msr_write(ecx, data) trace_kvm_msr(1, ecx, data) +#define trace_kvm_msr_read(ecx, data) trace_kvm_msr(0, ecx, data, false) +#define trace_kvm_msr_write(ecx, data) trace_kvm_msr(1, ecx, data, false) +#define trace_kvm_msr_read_ex(ecx) trace_kvm_msr(0, ecx, 0, true) +#define trace_kvm_msr_write_ex(ecx, data) trace_kvm_msr(1, ecx, data, true) /* * Tracepoint for guest CR access. diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 7a56879..334b016 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3158,6 +3158,7 @@ static int handle_rdmsr(struct kvm_vcpu *vcpu) u64 data; if (vmx_get_msr(vcpu, ecx, &data)) { + trace_kvm_msr_read_ex(ecx); kvm_inject_gp(vcpu, 0); return 1; } @@ -3177,13 +3178,13 @@ static int handle_wrmsr(struct kvm_vcpu *vcpu) u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u) | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32); - trace_kvm_msr_write(ecx, data); - if (vmx_set_msr(vcpu, ecx, data) != 0) { + trace_kvm_msr_write_ex(ecx, data); kvm_inject_gp(vcpu, 0); return 1; } + trace_kvm_msr_write(ecx, data); skip_emulated_instruction(vcpu); return 1; } -- 1.8.2.3