Commit 22d48b2d authored Jun 26, 2014 by Matthias Lange Committed by Paolo Bonzini Jul 11, 2014

KVM: svm: writes to MSR_K7_HWCR generates GPE in guest

Since commit 575203 the MCE subsystem in the Linux kernel for AMD sets bit 18
in MSR_K7_HWCR. Running such a kernel as a guest in KVM on an AMD host results
in a GPE injected into the guest because kvm_set_msr_common returns 1. This
patch fixes this by masking bit 18 from the MSR value desired by the guest.

Signed-off-by: Matthias Lange <matthias.lange@kernkonzept.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 5f7552d4

arch/x86/kvm/x86.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -2035,6 +2035,7 @@ int kvm_set_msr_common(struct kvm_vcpu vcpu, struct msr_data msr_info)
		data &= ~(u64)0x40; /* ignore flush filter disable */
		data &= ~(u64)0x100; /* ignore ignne emulation enable */
		data &= ~(u64)0x8; /* ignore TLB cache disable */
		data &= ~(u64)0x40000; /* ignore Mc status write enable */
		if (data != 0) {
		vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
		data);

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