Messages in this thread | | | Subject | Re: [RFC][PATCH v2 00/21] x86/pti: Defer CR3 switch to C code | From | Alexandre Chartre <> | Date | Wed, 18 Nov 2020 08:08:48 +0100 |
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On 11/17/20 10:23 PM, Borislav Petkov wrote: > On Tue, Nov 17, 2020 at 08:02:51PM +0100, Alexandre Chartre wrote: >> No. This prevents the guest VM from gathering data from the host >> kernel on the same cpu-thread. But there's no mitigation for a guest >> VM running on a cpu-thread attacking another cpu-thread (which can be >> running another guest VM or the host kernel) from the same cpu-core. >> You cannot use flush/clear barriers because the two cpu-threads are >> running in parallel. > > Now there's your justification for why you're doing this. It took a > while... > > The "why" should always be part of the 0th message to provide > reviewers/maintainers with answers to the question, what this pile of > patches is all about. Please always add this rationale to your patchset > in the future. >
Sorry about that, I will definitively try to do better next time. :-}
Thanks,
alex.
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