linux-kernel - Re: [PATCH v2 20/28] KVM: x86/mmu: Use atomic ops to set SPTEs in TDP MMU map

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Message-ID: <a3c8a2c7-988d-edeb-a509-1075ebba5c82@redhat.com>
Date:   Mon, 8 Feb 2021 11:32:17 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Ben Gardon <bgardon@...gle.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Peter Xu <peterx@...hat.com>,
        Peter Shier <pshier@...gle.com>,
        Peter Feiner <pfeiner@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>
Subject: Re: [PATCH v2 20/28] KVM: x86/mmu: Use atomic ops to set SPTEs in TDP
 MMU map

On 06/02/21 01:26, Sean Christopherson wrote:
> We could fudge around it via #ifdef around the xchg().  Making all of tdp_mmu.c
> x86-64 only would be nice to avoid future annoyance, though the number of stubs
> required would be painful...

It's really just a handful, so it's worth it.

Paolo