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Commit 3afb1121 authored Sep 18, 2015 by Paolo Bonzini

KVM: x86: trap AMD MSRs for the TSeg base and mask



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>

parent ebae871a

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: