Messages in this thread | | | Date | Mon, 7 Feb 2022 16:09:58 +0000 | From | Sean Christopherson <> | Subject | Re: [PATCH 01/23] KVM: MMU: pass uses_nx directly to reset_shadow_zero_bits_mask |
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On Sat, Feb 05, 2022, Paolo Bonzini wrote: > On 2/4/22 18:59, David Matlack wrote: > > > + reset_shadow_zero_bits_mask(vcpu, context, is_efer_nx(context)); > > > > Out of curiousity, how does KVM mitigate iTLB multi-hit when shadowing > > NPT and the guest has not enabled EFER.NX? > > You got me worried for a second but iTLB multihit is Intel-only, isn't it?
AFAIK, yes, big Core only. arch/x86/kernel/cpu/common.c sets NO_ITLB_MULTIHIT for all AMD, Hygon, and Atom CPUs.
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