Hi,
The following patch makes sure all code path of failed emulation
runs trace_kvm_emulate_insn_failed().
Please let me know if there is anything missing or wrong.
Thank you.
Signed-off-by: Manish Regmi <regmi.man...@gmail.com>
--------
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b6e7535..fd1e875 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3784,36 +3784,35 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
c = &vcpu->arch.emulate_ctxt.decode;
if (emulation_type & EMULTYPE_TRAP_UD) {
if (!c->twobyte)
- return EMULATE_FAIL;
+ goto emulate_failed;
switch (c->b) {
case 0x01: /* VMMCALL */
if (c->modrm_mod != 3 || c->modrm_rm != 1)
- return EMULATE_FAIL;
+ goto emulate_failed;
break;
case 0x34: /* sysenter */
case 0x35: /* sysexit */
if (c->modrm_mod != 0 || c->modrm_rm != 0)
- return EMULATE_FAIL;
+ goto emulate_failed;
break;
case 0x05: /* syscall */
if (c->modrm_mod != 0 || c->modrm_rm != 0)
- return EMULATE_FAIL;
+ goto emulate_failed;;
break;
default:
- return EMULATE_FAIL;
+ goto emulate_failed;
}
if (!(c->modrm_reg == 0 || c->modrm_reg == 3))
- return EMULATE_FAIL;
+ goto emulate_failed;
}
++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;
+ goto emulate_failed;
}
}
@@ -3848,9 +3847,8 @@ restart:
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;
+ goto emulate_failed;
}
return EMULATE_DO_MMIO;
}
@@ -3868,6 +3866,10 @@ done:
goto restart;
return EMULATE_DONE;
+
+emulate_failed:
+ trace_kvm_emulate_insn_failed(vcpu);
+ return EMULATE_FAIL;
}
EXPORT_SYMBOL_GPL(emulate_instruction);
---------------------------------------------------------------
regards
Manish Regmi
http://manish-cs.blogspot.com
http://ext2read.sf.net
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