linux-kernel - Re: [PATCH 4/4] KVM: selftests: Test access to XMM fast hypercalls

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Message-ID: <1939b03b-cec3-2c2e-2f67-b0dfc2c83735@redhat.com>
Date:   Tue, 3 Aug 2021 12:10:20 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>
Cc:     kvm@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] KVM: selftests: Test access to XMM fast hypercalls

On 30/07/21 16:50, Vitaly Kuznetsov wrote:
>> Should we also do WRITE_ONCE(nr_ur, 0) here?
> It could probably make sense to replace 'nr_ud = 0' above with this so
> compiler doesn't screw us up one day..
> 

It should be okay with the "memory" clobber.

Paolo