Messages in this thread | | | Subject | Re: [PATCH v5 4/5] KVM: VMX: Allow direct access to MSR_IA32_SPEC_CTRL | From | Andy Lutomirski <> | Date | Wed, 31 Jan 2018 14:53:55 -0800 |
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> On Jan 31, 2018, at 2:06 PM, Jim Mattson <jmattson@google.com> wrote: > >> On Wed, Jan 31, 2018 at 1:59 PM, David Woodhouse <dwmw2@infradead.org> wrote: >> I'm actually working on IBRS_ALL at the moment. >> >> I was tempted to *not* let the guests turn it off. Expose SPEC_CTRL but >> just make it a no-op. > > Maybe we could convince Intel to add a LOCK bit to IA32_SPEC_CTRL like > the one in IA32_FEATURE_CONTROL.
Please no. Some BIOS vendor is going to lock it to zero to win some silly benchmark.
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