svm last branch recording MSR emulation
PATCH 1/1 svm last branch recording MSR emulation
Hi,
this patch adds support for the lbr MSR emulation, it also enables support for Windows XP 64bit guests.
svm.c renamed from svm.c.orig +28 -0
@@ -1099,6 +1100,21 @@case MSR_IA32_SYSENTER_ESP : *data = svm->vmcb->save.sysenter_esp;break ; +case MSR_IA32_DEBUGCTLMSR : + *data = svm->vmcb->save.dbgctl; +break ; +case MSR_IA32_LASTBRANCHFROMIP : + *data = svm->vmcb->save.br_from; +break ; +case MSR_IA32_LASTBRANCHTOIP : + *data = svm->vmcb->save.br_to; +break ; +case MSR_IA32_LASTINTFROMIP : + *data = svm->vmcb->save.last_excp_from; +break ; +case MSR_IA32_LASTINTTOIP : + *data = svm->vmcb->save.last_excp_to; +break ;default :return kvm_get_msr_common (vcpu, ecx, data); }
@@ -1171,6 +1187,19 @@if (data !=0 ) goto unhandled;break ; +case MSR_IA32_DEBUGCTLMSR : + svm->vmcb->save.dbgctl = data; +if (svm->vmcb->save.dbgctl &&svm_has (SVM_FEATURE_LBRV )) { +void *msrpm_va; + svm->vmcb->control.lbr_ctl =1 ; + msrpm_va =page_address (pfn_to_page (msrpm_base >>PAGE_SHIFT )); +set_msr_interception (msrpm_va,MSR_IA32_DEBUGCTLMSR ,0 ,0 ); +set_msr_interception (msrpm_va,MSR_IA32_LASTBRANCHFROMIP ,0 ,0 ); +set_msr_interception (msrpm_va,MSR_IA32_LASTBRANCHTOIP ,0 ,0 ); +set_msr_interception (msrpm_va,MSR_IA32_LASTINTFROMIP ,0 ,0 ); +set_msr_interception (msrpm_va,MSR_IA32_LASTINTTOIP ,0 ,0 ); + } +break ;default : unhandled:return kvm_set_msr_common (vcpu, ecx, data);
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Quoted 6 lines · Markus Rechberger
this patch adds support for the lbr MSR emulation, it also enables support for Windows XP 64bit guests.
Signed-off-by Joerg Roedel <[email protected]>Signed-off-by Markus Rechberger <[email protected]>
svm.c line 1194
Quoted 8 lines
svm.c renamed from svm.c.orig +4
-0@@ -1171,6 +1187,19 @@if (data !=0 ) goto unhandled;break ; +case MSR_IA32_DEBUGCTLMSR : + svm->vmcb->save.dbgctl = data; +if (svm->vmcb->save.dbgctl &&svm_has (SVM_FEATURE_LBRV )) { +void *msrpm_va;
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svm.c line 1204
Quoted 11 lines
svm.c renamed from svm.c.orig +9
-0+ svm->vmcb->control.lbr_ctl =1 ; + msrpm_va =page_address (pfn_to_page (msrpm_base >>PAGE_SHIFT )); +set_msr_interception (msrpm_va,MSR_IA32_DEBUGCTLMSR ,0 ,0 ); +set_msr_interception (msrpm_va,MSR_IA32_LASTBRANCHFROMIP ,0 ,0 ); +set_msr_interception (msrpm_va,MSR_IA32_LASTBRANCHTOIP ,0 ,0 ); +set_msr_interception (msrpm_va,MSR_IA32_LASTINTFROMIP ,0 ,0 ); +set_msr_interception (msrpm_va,MSR_IA32_LASTINTTOIP ,0 ,0 ); + } +break ;default : unhandled:
What is the performance impact (for example, on user/test/x86/vmexit.flat when modified to set a bit in debugctl)?
Is it not better to enable LBR virtualization only when the guest enables LBR (but avoid it when other bits are enabled)?
Can we disable LBR virtualization when the guest disables LBR?
Signature · 7 lines
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