Messages in this thread | | | Subject | Re: [PATCH 3/8] kvm: vmx: pass MSR_IA32_SPEC_CTRL and MSR_IA32_PRED_CMD down to the guest | From | Paolo Bonzini <> | Date | Wed, 10 Jan 2018 15:28:43 +0100 |
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On 10/01/2018 15:06, Arjan van de Ven wrote: > On 1/10/2018 5:20 AM, Paolo Bonzini wrote: >> * a simple specification that does "IBRS=1 blocks indirect branch >> prediction altogether" would actually satisfy the specification just as >> well, and it would be nice to know if that's what the processor actually >> does. > > it doesn't exactly, not for all. > > so you really do need to write ibrs again.
Okay, so "always set IBRS=1" does *not* protect against variant 2. Thanks,
Paolo
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