linux-kernel - Re: [PATCH 01/23] KVM: MMU: pass uses_nx directly to reset_shadow_zero_bits

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Message-ID: <8081cbe5-6d12-9f99-9f0f-13c1d7617647@redhat.com>
Date:   Sat, 5 Feb 2022 15:52:15 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     David Matlack <dmatlack@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        seanjc@...gle.com, vkuznets@...hat.com
Subject: Re: [PATCH 01/23] KVM: MMU: pass uses_nx directly to
 reset_shadow_zero_bits_mask

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?

Paolo