KVM: x86: trap AMD MSRs for the TSeg base and mask (3afb1121) · Commits · 戴 / test

These have roughly the same purpose as the SMRR, which we do not need to implement in KVM. However, Linux accesses MSR_K8_TSEG_ADDR at boot, which causes problems when running a Xen dom0 under KVM. Just return 0, meaning that processor protection of SMRAM is not in effect. Reported-by:

M A Young <m.a.young@durham.ac.uk> Cc: stable@vger.kernel.org Acked-by:

Borislav Petkov <bp@suse.de> 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
		@@ -331,6 +331,7 @@
		/* C1E active bits in int pending message */
		#define K8_INTP_C1E_ACTIVE_MASK 0x18000000
		#define MSR_K8_TSEG_ADDR 0xc0010112
		#define MSR_K8_TSEG_MASK 0xc0010113
		#define K8_MTRRFIXRANGE_DRAM_ENABLE 0x00040000 /* MtrrFixDramEn bit */
		#define K8_MTRRFIXRANGE_DRAM_MODIFY 0x00080000 /* MtrrFixDramModEn bit */
		#define K8_MTRR_RDMEM_WRMEM_MASK 0x18181818 /* Mask: RdMem\|WrMem */

arch/x86/kvm/x86.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2190,6 +2190,8 @@ int kvm_get_msr_common(struct kvm_vcpu vcpu, struct msr_data msr_info)
		case MSR_IA32_LASTINTFROMIP:
		case MSR_IA32_LASTINTTOIP:
		case MSR_K8_SYSCFG:
		case MSR_K8_TSEG_ADDR:
		case MSR_K8_TSEG_MASK:
		case MSR_K7_HWCR:
		case MSR_VM_HSAVE_PA:
		case MSR_K8_INT_PENDING_MSG:

Admin message