Commit 2cdef91c authored Nov 05, 2020 by Pankaj Gupta Committed by Paolo Bonzini Nov 08, 2020

KVM: x86: handle MSR_IA32_DEBUGCTLMSR with report_ignored_msrs



Windows2016 guest tries to enable LBR by setting the corresponding bits
in MSR_IA32_DEBUGCTLMSR. KVM does not emulate MSR_IA32_DEBUGCTLMSR and
spams the host kernel logs with error messages like:

	kvm [...]: vcpu1, guest rIP: 0xfffff800a8b687d3 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR 0x1, nop"

This patch fixes this by enabling error logging only with
'report_ignored_msrs=1'.

Signed-off-by: Pankaj Gupta <pankaj.gupta@cloud.ionos.com>
Message-Id: <20201105153932.24316-1-pankaj.gupta.linux@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 1e293d1a

arch/x86/kvm/x86.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -3065,7 +3065,7 @@ int kvm_set_msr_common(struct kvm_vcpu vcpu, struct msr_data msr_info)
		/* Values other than LBR and BTF are vendor-specific,
		thus reserved and should throw a #GP */
		return 1;
		}
		} else if (report_ignored_msrs)
		vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
		__func__, data);
		break;

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