linux-kernel - Re: [PATCH] KVM: X86: Allow userspace to define the microcode version

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Message-ID: <20180226122205.GG4377@pd.tnic>
Date:   Mon, 26 Feb 2018 13:22:05 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Wanpeng Li <kernellwp@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH] KVM: X86: Allow userspace to define the microcode version

On Mon, Feb 26, 2018 at 01:18:07PM +0100, Paolo Bonzini wrote:
> > In this context, "host-initiated" write means written by KVM userspace
> > with ioctl(KVM_SET_MSR).  It generally happens only on VM startup, reset
> > or live migration.
> 
> To be clear, the target of the write is still the vCPU's emulated MSR.

So how am I to imagine this as a user:

qemu-system-x86_64 --microcode-revision=0xdeadbeef...

?

-- 
Regards/Gruss,
    Boris.

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