[PATCH] KVM: x86: Add MSR_AMD64_DC_CFG to the list of ignored MSRs

From: Ladi Prosek <lprosek@redhat.com>
To: kvm@vger.kernel.org
Cc: joro@8bytes.org
Subject: [PATCH] KVM: x86: Add MSR_AMD64_DC_CFG to the list of ignored MSRs
Date: Thu,  6 Apr 2017 15:22:20 +0200	[thread overview]
Message-ID: <20170406132220.17178-1-lprosek@redhat.com> (raw)

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@redhat.com>
---
 arch/x86/kvm/x86.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ccbd45e..44814b5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2155,6 +2155,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 	case MSR_VM_HSAVE_PA:
 	case MSR_AMD64_PATCH_LOADER:
 	case MSR_AMD64_BU_CFG2:
+	case MSR_AMD64_DC_CFG:
 		break;
 
 	case MSR_EFER:
@@ -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:
 		msr_info->data = 0;
 		break;
 	case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3:
-- 
2.9.3
