linux-kernel - Re: [PATCH] KVM: x86: do not reset microcode version on INIT or RESET

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Message-ID: <713f14e711fc493f8a8de4adf2f4b6f5@huawei.com>
Date:   Wed, 12 Feb 2020 01:53:51 +0000
From:   linmiaohe <linmiaohe@...wei.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH] KVM: x86: do not reset microcode version on INIT or RESET

Paolo Bonzini <pbonzini@...hat.com> writes:
> The microcode version should be set just once, since it is essentially a CPU feature; so do it on vCPU creation rather than reset.
>
> Userspace can tie the fix to the availability of MSR_IA32_UCODE_REV in the list of emulated MSRs.
>
> Reported-by: Alex Williamson <alex.williamson@...hat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Looks good. Thanks.
Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>