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Commit 22d48b2d authored by Matthias Lange's avatar Matthias Lange Committed by Paolo Bonzini
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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: default avatarMatthias Lange <matthias.lange@kernkonzept.com>
Signed-off-by: default avatarPaolo 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);