kvm: x86: Add AMD's EX_CFG to the list of ignored MSRs (0e1b869f) · Commits · 戴 / test

Some guests OSes (including Windows 10) write to MSR 0xc001102c on some cases (possibly while trying to apply a CPU errata). Make KVM ignore reads and writes to that MSR, so the guest won't crash. The MSR is documented as "Execution Unit Configuration (EX_CFG)", at AMD's "BIOS and Kernel Developer's Guide (BKDG) for AMD Family 15h Models 00h-0Fh Processors". Cc: stable@vger.kernel.org Signed-off-by:

Eduardo Habkost <ehabkost@redhat.com> Signed-off-by:

Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/msr-index.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -390,6 +390,7 @@
		#define MSR_F15H_NB_PERF_CTR 0xc0010241
		#define MSR_F15H_PTSC 0xc0010280
		#define MSR_F15H_IC_CFG 0xc0011021
		#define MSR_F15H_EX_CFG 0xc001102c

		/* Fam 10h MSRs */
		#define MSR_FAM10H_MMIO_CONF_BASE 0xc0010058

arch/x86/kvm/x86.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2426,6 +2426,7 @@ int kvm_set_msr_common(struct kvm_vcpu vcpu, struct msr_data msr_info)
		case MSR_AMD64_PATCH_LOADER:
		case MSR_AMD64_BU_CFG2:
		case MSR_AMD64_DC_CFG:
		case MSR_F15H_EX_CFG:
		break;

		case MSR_IA32_UCODE_REV:
		@@ -2721,6 +2722,7 @@ int kvm_get_msr_common(struct kvm_vcpu vcpu, struct msr_data msr_info)
		case MSR_AMD64_BU_CFG2:
		case MSR_IA32_PERF_CTL:
		case MSR_AMD64_DC_CFG:
		case MSR_F15H_EX_CFG:
		msr_info->data = 0;
		break;
		case MSR_F15H_PERF_CTL0 ... MSR_F15H_PERF_CTR5:

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