KVM: x86: report valid microcode update ID

Windows Server 2008 SP2 checked build with smp > 1 BSOD's during boot due to lack of microcode update: *** Assertion failed: The system BIOS on this machine does not properly support the processor. The system BIOS did not load any microcode update. A BIOS containing the latest microcode update is needed for system reliability. (CurrentUpdateRevision != 0) *** Source File: d:\longhorn\base\hals\update\intelupd\update.c, line 440 Report a non-zero microcode update signature to make it happy. Signed-off-by: Marcelo Tosatti <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
redpig · Sep 25, 2011 · 742bc67 · 742bc67
1 parent 1d2887e
commit 742bc67
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
@@ -1842,7 +1842,6 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 
 	switch (msr) {
 	case MSR_IA32_PLATFORM_ID:
-	case MSR_IA32_UCODE_REV:
 	case MSR_IA32_EBL_CR_POWERON:
 	case MSR_IA32_DEBUGCTLMSR:
 	case MSR_IA32_LASTBRANCHFROMIP:
@@ -1863,6 +1862,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case MSR_FAM10H_MMIO_CONF_BASE:
 		data = 0;
 		break;
+	case MSR_IA32_UCODE_REV:
+		data = 0x100000000ULL;
+		break;
 	case MSR_MTRRcap:
 		data = 0x500 | KVM_NR_VAR_MTRR;
 		break;