2017-04-06 15:22+0200, Ladi Prosek: > Hyper-V writes 0x800000000000 to MSR_AMD64_DC_CFG when running on AMD CPUs > as recommended in erratum 383, analogous to our svm_init_erratum_383. > > By ignoring the MSR, this patch enables running Hyper-V in L1 on AMD. > > Signed-off-by: Ladi Prosek <lprosek@xxxxxxxxxx> > --- Dirty, but I don't see a reason to overengineer this ... Applied to kvm/queue, thanks. > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > @@ -2417,6 +2418,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) > case MSR_FAM10H_MMIO_CONF_BASE: > case MSR_AMD64_BU_CFG2: > case MSR_IA32_PERF_CTL: > + case MSR_AMD64_DC_CFG: This will change L1 KVM's behavior to set erratum_383_found, but L0 will kill it anyway after hitting the errata in L2.
