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Re: [Qemu-devel] [PATCH 1/5] i386: Add support for IA32_PRED_CMD and IA3

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 1/5] i386: Add support for IA32_PRED_CMD and IA32_ARCH_CAPABILITIES MSRs
Date: Tue, 26 Jun 2018 11:20:23 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 26/06/2018 10:58, Robert Hoo wrote:
>> This is not needed, because pred_cmd is write only and arch_capabilities
>> is read only.  The guest cannot modify any of them.
> Thanks Paolo. Yes, indeed unnecessary.
> I looked into the
> 336996-Speculative-Execution-Side-Channel-Mitigations.pdf again, looks
> like the vmstate_spec_ctrl is similar to pred_cmd, wirte only. Shall I
> remove it as well in v2 patch?

No, spec_ctrl is read-write.


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