linux-kernel - Re: [PATCH 16/18] KVM: Don't take mmu_lock for range invalidation unless necessary

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Date:   Wed, 31 Mar 2021 23:00:19 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Marc Zyngier <maz@...nel.org>, Huacai Chen <chenhuacai@...nel.org>,
        Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
        Paul Mackerras <paulus@...abs.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-mips@...r.kernel.org, kvm@...r.kernel.org,
        kvm-ppc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ben Gardon <bgardon@...gle.com>
Subject: Re: [PATCH 16/18] KVM: Don't take mmu_lock for range invalidation
 unless necessary

On 31/03/21 22:52, Sean Christopherson wrote:
> 100% agree with introducing on_lock separately from the conditional locking.
> 
> Not so sure about introducing conditional locking and then converting non-x86
> archs.  I'd prefer to keep the conditional locking after arch conversion.
> If something does go awry, it would be nice to be able to preciesly bisect to
> the conditional locking.  Ditto if it needs to be reverted because it breaks an
> arch.

Ok, that sounds good too.

Paolo