Currently, Intel Processor Trace do not support tracing in L1 guest VMX operation(IA32_VMX_MISC[bit 14] is 0). As mentioned in SDM, on these type of processors, execution of the VMXON instruction will clears IA32_RTIT_CTL.TraceEn and any attempt to write IA32_RTIT_CTL causes a general-protection xception (#GP).
Signed-off-by: Luwei Kang <[email protected]> --- arch/x86/kvm/vmx.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index e002a44..b4ad8fc 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -7573,6 +7573,12 @@ static int handle_vmon(struct kvm_vcpu *vcpu) if (ret) return ret; + if (pt_mode == PT_MODE_HOST_GUEST) { + vmx->pt_desc.guest.ctl &= ~RTIT_CTL_TRACEEN; + pt_disable_intercept_for_msr(FALSE); + vmcs_write64(GUEST_IA32_RTIT_CTL, vmx->pt_desc.guest.ctl); + } + nested_vmx_succeed(vcpu); return kvm_skip_emulated_instruction(vcpu); } -- 1.8.3.1
