Messages in this thread | | | From | Jim Mattson <> | Date | Wed, 31 Jan 2018 13:53:59 -0800 | Subject | Re: [PATCH v5 4/5] KVM: VMX: Allow direct access to MSR_IA32_SPEC_CTRL |
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On Wed, Jan 31, 2018 at 1:42 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
> Can we just say it sucks to be L2 too? :) Because in the end as long as > no one ever writes to spec_ctrl, everybody is happy.
Unfortunately, quite a few OS vendors shipped IBRS-based mitigations earlier this month. (Has Redhat stopped writing to IA32_SPEC_CTRL yet? :-)
And in the long run, everyone is going to set IA32_SPEC_CTRL.IBRS=1 on CPUs with IA32_ARCH_CAPABILITIES.IBRS_ALL.
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