[PATCH] svm last branch recording MSR emulation

["Markus Rechberger" <markus.rechberger-5C7GfCeVMHo@public.gmane.org>]

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Hi,

this patch adds support for the lbr MSR emulation, it also enables 
support for Windows XP 64bit guests.

Signed-off-by: Joerg Roedel <Joerg.Roedel-5C7GfCeVMHo@public.gmane.org>
Signed-off-by: Markus Rechberger <Markus.Rechberger-5C7GfCeVMHo@public.gmane.org>


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--- svm.c.orig	2008-01-23 10:04:14.000000000 +0100
+++ svm.c	2008-01-25 12:52:11.000000000 +0100
@@ -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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