linux-kernel - Re: [PATCH 5/5] KVM: x86/xen: Explicitly pad struct compat_vcpu

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Message-ID: <YCRMY17WEdpJYd3C@google.com>
Date:   Wed, 10 Feb 2021 13:13:07 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     "Woodhouse, David" <dwmw@...zon.co.uk>
Cc:     "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "wanpengli@...cent.com" <wanpengli@...cent.com>
Subject: Re: [PATCH 5/5] KVM: x86/xen: Explicitly pad struct compat_vcpu_info
 to 64 bytes

On Wed, Feb 10, 2021, Woodhouse, David wrote:
> On Wed, 2021-02-10 at 10:26 -0800, Sean Christopherson wrote:
> So it isn't clear the additionally padding really buys us anything; if
> we play this game without knowing the ABI we'd be screwed anyway. But
> it doesn't hurt.

Ya, this is purely for folks reading the code and wondering how 62==64.