Commit 742bc670 authored Jul 29, 2011 by Marcelo Tosatti Committed by Avi Kivity Sep 25, 2011

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 <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

parent 1d2887e2

arch/x86/kvm/x86.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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;