linux-kernel - Re: [PATCH v2 4/4] KVM: hyper-v: Advertise support for fast XMM hypercalls

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Message-ID: <20210413091110.GB25751@u366d62d47e3651.ant.amazon.com>
Date:   Tue, 13 Apr 2021 11:11:11 +0200
From:   Siddharth Chandrasekaran <sidcha@...zon.de>
To:     Wei Liu <wei.liu@...nel.org>
CC:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "Borislav Petkov" <bp@...en8.de>, <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        "Alexander Graf" <graf@...zon.com>,
        Evgeny Iakovlev <eyakovl@...zon.de>,
        Liran Alon <liran@...zon.com>,
        Ioannis Aslanidis <iaslan@...zon.de>,
        <linux-hyperv@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 4/4] KVM: hyper-v: Advertise support for fast XMM hypercalls

On Mon, Apr 12, 2021 at 08:14:23PM +0000, Wei Liu wrote:
> On Mon, Apr 12, 2021 at 07:00:17PM +0200, Siddharth Chandrasekaran wrote:
> > Now that all extant hypercalls that can use XMM registers (based on
> > spec) for input/outputs are patched to support them, we can start
> > advertising this feature to guests.
> >
> > Cc: Alexander Graf <graf@...zon.com>
> > Cc: Evgeny Iakovlev <eyakovl@...zon.de>
> > Signed-off-by: Siddharth Chandrasekaran <sidcha@...zon.de>
> > ---
> >  arch/x86/include/asm/hyperv-tlfs.h | 7 ++++++-
> >  arch/x86/kvm/hyperv.c              | 2 ++
> >  2 files changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
> > index e6cd3fee562b..716f12be411e 100644
> > --- a/arch/x86/include/asm/hyperv-tlfs.h
> > +++ b/arch/x86/include/asm/hyperv-tlfs.h
> > @@ -52,7 +52,7 @@
> >   * Support for passing hypercall input parameter block via XMM
> >   * registers is available
> >   */
> > -#define HV_X64_HYPERCALL_PARAMS_XMM_AVAILABLE                BIT(4)
> > +#define HV_X64_HYPERCALL_XMM_INPUT_AVAILABLE         BIT(4)
> >  /* Support for a virtual guest idle state is available */
> >  #define HV_X64_GUEST_IDLE_STATE_AVAILABLE            BIT(5)
> >  /* Frequency MSRs available */
> > @@ -61,6 +61,11 @@
> >  #define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE         BIT(10)
> >  /* Support for debug MSRs available */
> >  #define HV_FEATURE_DEBUG_MSRS_AVAILABLE                      BIT(11)
> > +/*
> > + * Support for returning hypercall ouput block via XMM
> 
> "output"

Fixed. Thanks.

~ Sid.



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