4.14-stable review patch. If anyone has any objections, please let me know.
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From: Eduardo Habkost ehabkost@redhat.com
commit 0e1b869fff60c81b510c2d00602d778f8f59dd9a upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/include/asm/msr-index.h | 1 + arch/x86/kvm/x86.c | 2 ++ 2 files changed, 3 insertions(+)
--- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -372,6 +372,7 @@ #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 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2227,6 +2227,7 @@ int kvm_set_msr_common(struct kvm_vcpu * 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: @@ -2508,6 +2509,7 @@ int kvm_get_msr_common(struct kvm_vcpu * 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_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3: