Messages in this thread |  | | Subject | Re: [PATCH] KVM: X86: Allow userspace to define the microcode version | From | Paolo Bonzini <> | Date | Wed, 18 Apr 2018 12:36:37 +0200 |
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On 18/04/2018 11:03, Eduardo Habkost wrote: >>> QEMU setting ucode_rev automatically using the host value when >>> using "-cpu host" (with no need for explicit ucode_rev option) >>> makes sense to me. >> QEMU can't get the host value by rdmsr MSR_IA32_UCODE_REV directly >> since rdmsr will #GP when ring !=0, any idea? > By looking at kvm_get_msr_feature(), it looks like > ioctl(system_fd, KVM_GET_MSRS) would return the host MSR value > for us.
Yes, that's exactly what it was introduced for (together with other MSRs including VMX capabilities).
Paolo
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