On 18/12/18 01:34, Eduardo Habkost wrote: > 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". > > Signed-off-by: Eduardo Habkost <ehabkost@xxxxxxxxxx> > --- > arch/x86/include/asm/msr-index.h | 1 + > arch/x86/kvm/x86.c | 2 ++ > 2 files changed, 3 insertions(+) > > diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h > index c8f73efb4ece..9e39cc8bd989 100644 > --- a/arch/x86/include/asm/msr-index.h > +++ b/arch/x86/include/asm/msr-index.h > @@ -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 > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 9cbce3ec84ec..69f822165fe2 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -2429,6 +2429,7 @@ 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: > @@ -2724,6 +2725,7 @@ 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: > Queued, thanks. Paolo
