lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

KVM: Trace emulated instructions

Browse Source 
Log emulated instructions in ftrace, especially if they failed.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity
2010-04-11 13:05:16 +03:00
parent 2fb53ad811
commit e46479f852
2 changed files with 90 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kvm/x86.c
View File

@@ -3718,6 +3718,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
trace_kvm_emulate_insn_start(vcpu);
/* Only allow emulation of specific instructions on #UD
* (namely VMMCALL, sysenter, sysexit, syscall)*/
@@ -3750,6 +3751,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
++vcpu->stat.insn_emulation;
if (r) {
++vcpu->stat.insn_emulation_fail;
trace_kvm_emulate_insn_failed(vcpu);
if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
return EMULATE_DONE;
return EMULATE_FAIL;
@@ -3786,6 +3788,8 @@ restart:
if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
goto done;
if (!vcpu->mmio_needed) {
++vcpu->stat.insn_emulation_fail;
trace_kvm_emulate_insn_failed(vcpu);
kvm_report_emulation_failure(vcpu, "mmio");
return EMULATE_FAIL;
}