Messages in this thread | | | Subject | Re: [PATCH 6/6] s390: scrub registers on kernel entry and KVM exit | From | QingFeng Hao <> | Date | Fri, 19 Jan 2018 16:27:08 +0800 |
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在 2018/1/19 15:57, Christian Borntraeger 写道: > > 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. Got it! thanks for your explanation! > >> 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. nod, this makes sense!
-- Regards QingFeng Hao
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