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Re: [Qemu-devel] Do I need update the microcode of virtual machine
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] Do I need update the microcode of virtual machine |
Date: |
Thu, 18 Jan 2018 11:50:49 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 |
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