On 01/19/2018 07:29 AM, QingFeng Hao wrote:
>
>
> 在 2018/1/17 17:48, Martin Schwidefsky 写道:
>> Clear all user space registers on entry to the kernel and all KVM guest
>> registers on KVM guest exit if the register does not contain either a
>> parameter or a result value.
> I am not sure if I understand this but it will be safer?
It ist similar to commit 0cb5b30698fd ("kvm: vmx: Scrub hardware GPRs at VM-exit").
The idea is to minimize potential payload channels.
> And can we abstract the operations to be a macro like CLEAR_REG_7?
No, please.
xgr %r7,%r7
is absolutely clear what it does, a MACRO often is not.
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