From: Paolo Bonzini <pbonzini@redhat.com>
To: Li Qiang <liq3ea@gmail.com>
Cc: Qemu Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] Do I need update the microcode of virtual machine
Date: Thu, 18 Jan 2018 11:50:49 +0100 [thread overview]
Message-ID: <027977e8-b4bd-4ac3-f126-e378c29b990c@redhat.com> (raw)
In-Reply-To: <CAKXe6SJwebj1Jzkwn8nCCkXZbx3HzOEYT8RFfKoJsiDfwiuvdg@mail.gmail.com>
On 18/01/2018 11:48, Li Qiang wrote:
>
> > But upon I update the centos guest, the host kvm/qemu has been updated.
> > The IBPB_ENABLED and IBRS_ENABLED are both zero if I don't update the
> > microcode in the guest. If I update the guest micorcode, the are both 1.
>
> What do you mean by "update the guest microcode"? Did you mean host?
>
>
> No, here mean the guest. By overwrite guest's files in
> /lib/firmware/intel-ucode/ directory and "echo 1 >
> /sys/devices/system/cpu/microcode/reload" as Intel's instruction says.
> The host's kvm and qemu has been got updated before this.
No, that has no effect.
Paolo
next prev parent reply other threads:[~2018-01-18 10:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-18 10:38 [Qemu-devel] Do I need update the microcode of virtual machine Li Qiang
2018-01-18 10:43 ` Paolo Bonzini
2018-01-18 10:48 ` Li Qiang
2018-01-18 10:50 ` Paolo Bonzini [this message]
2018-01-18 10:49 ` Daniel P. Berrange
2018-01-18 11:23 ` Li Qiang
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