linux-kernel - Re: [PATCH RFC 02/39] KVM: x86/xen: intercept xen hypercalls if enabled

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Message-ID: <594b0e2a-9377-1b67-be93-924cae2db7f4@redhat.com>
Date:   Fri, 22 Feb 2019 13:50:20 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Joao Martins <joao.m.martins@...cle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ankur Arora <ankur.a.arora@...cle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH RFC 02/39] KVM: x86/xen: intercept xen hypercalls if
 enabled

On 22/02/19 01:30, Sean Christopherson wrote:
> On Thu, Feb 21, 2019 at 08:56:06PM +0000, Joao Martins wrote:
>> The Xen addition follows the same structure as Hyper-V in kvm (what you suggest
>> here is probably applicable for both). i.e. there's some Xen specific routines
>> for vm/vcpu init/teardown, and timer handling. We would have to place some of
>> those functions into a struct that gets registered at modinit.
> 
> Huh.  I never really hooked at the Hyper-V code, for some reason I always
> assumed it was only related to running KVM on Hyper-V.  I agree that this
> extra hurdle only makes sense if it's also applied to Hyper-V.

The difference is that Hyper-V support is more or less mandatory to run
recent Windows guests.  Having a config symbol would be enough for me.

Paolo