linux-kernel - Re: [PATCH 3/4] KVM: x86: hyper-v: Check if guest is allowed to use XMM registers for hypercall input

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Message-ID: <20210730143054.GC20232@u366d62d47e3651.ant.amazon.com>
Date:   Fri, 30 Jul 2021 16:30:55 +0200
From:   Siddharth Chandrasekaran <sidcha@...zon.de>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
CC:     <kvm@...r.kernel.org>, Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] KVM: x86: hyper-v: Check if guest is allowed to use XMM
 registers for hypercall input

On Fri, Jul 30, 2021 at 02:26:24PM +0200, Vitaly Kuznetsov wrote:
> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe.
> 
> 
> 
> TLFS states that "Availability of the XMM fast hypercall interface is
> indicated via the “Hypervisor Feature Identification” CPUID Leaf
> (0x40000003, see section 2.4.4) ... Any attempt to use this interface
> when the hypervisor does not indicate availability will result in a #UD
> fault."
> 
> Implement the check for 'strict' mode (KVM_CAP_HYPERV_ENFORCE_CPUID).
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>

Reviewed-by: Siddharth Chandrasekaran <sidcha@...zon.de>



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