Commit 2cdef91c authored by Pankaj Gupta's avatar Pankaj Gupta Committed by Paolo Bonzini
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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: default avatarPankaj Gupta <pankaj.gupta@cloud.ionos.com>
Message-Id: <20201105153932.24316-1-pankaj.gupta.linux@gmail.com>
Signed-off-by: default avatarPaolo 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;