Messages in this thread | | | From | Jim Mattson <> | Date | Mon, 18 Nov 2019 11:39:57 -0800 | Subject | Re: [PATCH 1/5] KVM: x86: fix presentation of TSX feature in ARCH_CAPABILITIES |
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On Mon, Nov 18, 2019 at 10:17 AM Paolo Bonzini <pbonzini@redhat.com> wrote: > > KVM does not implement MSR_IA32_TSX_CTRL, so it must not be presented > to the guests. It is also confusing to have !ARCH_CAP_TSX_CTRL_MSR && > !RTM && ARCH_CAP_TAA_NO: lack of MSR_IA32_TSX_CTRL suggests TSX was not > hidden (it actually was), yet the value says that TSX is not vulnerable > to microarchitectural data sampling. Fix both.
I actually think kvm should virtualize IA32_TSX_CTRL for VMs that have exclusive use of their cores (i.e. the same VMs for which we disable MWAIT and HLT exiting).
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