linux-kernel - Re: [PATCH 3/5] KVM: selftests: Remove unnecessary register shuffling in fix_hypercall

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Message-ID: <YyjczAkNtxVYJoyN@google.com>
Date:   Mon, 19 Sep 2022 21:19:08 +0000
From:   Oliver Upton <oliver.upton@...ux.dev>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andrew Jones <andrew.jones@...ux.dev>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>
Subject: Re: [PATCH 3/5] KVM: selftests: Remove unnecessary register
 shuffling in fix_hypercall_test

On Thu, Sep 08, 2022 at 11:31:32PM +0000, Sean Christopherson wrote:
> Use input constraints to load RAX and RBX when testing that KVM correctly
> does/doesn't patch the "wrong" hypercall.  There's no need to manually
> load RAX and RBX, and no reason to clobber them either (KVM is not
> supposed to modify anything other than RAX).

Too much time on 'the other architecture' where we don't have input
constraints to load named registers per-se :)

> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviewed-by: Oliver Upton <oliver.upton@...ux.dev>

--
Thanks,
Oliver