linux-kernel - Re: [GIT PULL] KVM: x86: MMU changes for 6.9

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Message-ID: <CABgObfa3By9GU9_8FmqHQK-AxWU3ocbBkQK0xXwx2XRDP828dg@mail.gmail.com>
Date: Thu, 14 Mar 2024 19:31:30 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] KVM: x86: MMU changes for 6.9

On Fri, Mar 8, 2024 at 11:37 PM Sean Christopherson <seanjc@...gle.com> wrote:
>
>  - Zap TDP MMU roots at 4KiB granularity to minimize the delay in yielding if
>    a reschedule is needed, e.g. if a high priority task needs to run.  Because
>    KVM doesn't support yielding in the middle of processing a zapped non-leaf
>    SPTE, zapping at 1GiB granularity can result in multi-millisecond lag when
>    attempting to schedule in a high priority.
>

Would 2 MiB provide a nice middle ground?

Paolo