linux-kernel - Re: [PATCH 0/4] KVM: x86: hyper-v: XMM fast hypercalls fixes

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Message-ID: <Yhz16F+62fZfQkBN@147dda3edfb6.ant.amazon.com>
Date:   Mon, 28 Feb 2022 17:18:48 +0100
From:   Siddharth Chandrasekaran <sidcha@...zon.de>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
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>, Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH 0/4] KVM: x86: hyper-v: XMM fast hypercalls fixes

On Mon, Feb 28, 2022 at 12:09:14PM +0100, Vitaly Kuznetsov wrote:
> Siddharth Chandrasekaran <sidcha@...zon.de> writes:
> > On Fri, Feb 25, 2022 at 02:17:04PM +0100, Paolo Bonzini wrote:
> >> On 2/25/22 14:13, Vitaly Kuznetsov wrote:
> >> > Let's say we have 1 half of XMM0 consumed. Now:
> >> >
> >> >   i = 0;
> >> >   j = 1;
> >> >   if (1)
> >> >       sparse_banks[0] = sse128_lo(hc->xmm[0]);
> >> >
> >> >   This doesn't look right as we need to get the upper half of XMM0.
> >> >
> >> >   I guess it should be reversed,
> >> >
> >> >       if (j % 2)
> >> >           sparse_banks[i] = sse128_hi(hc->xmm[j / 2]);
> >> >       else
> >> >           sparse_banks[i] = sse128_lo(hc->xmm[j / 2]);
> >
> > Maybe I am missing parts of this series.. I dont see this change in any
> > of the 4 patches Vitaly sent. Yes, they look swapped to me too.
> >
> 
> There was a conflict with a patch series from Sean:
> https://lore.kernel.org/kvm/20211207220926.718794-1-seanjc@google.com/
> 
> and this is a part of the resolution:
> 
> commit c0f1eaeb9e628bf86bf50f11cb4a2b671528391e
> Merge: 4dfc4ec2b7f5 47d3e5cdfe60
> Author: Paolo Bonzini <pbonzini@...hat.com>
> Date:   Fri Feb 25 06:28:10 2022 -0500
> 
>     Merge branch 'kvm-hv-xmm-hypercall-fixes' into HEAD

Got it, thank you!

~ Sid.



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