linux-kernel - Re: [Xen-devel] [PATCH 3/3] x86/xen: use guest_late

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Message-ID: <9c7b5d1e-bab5-f2b0-9c65-48d0d99828eb@suse.com>
Date:   Wed, 8 Nov 2017 13:40:43 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Jan Beulich <JBeulich@...e.com>
Cc:     len.brown@...el.com, x86@...nel.org, tglx@...utronix.de,
        xen-devel@...ts.xenproject.org, boris.ostrovsky@...cle.com,
        mingo@...hat.com, rkrcmar@...hat.com, rjw@...ysocki.net,
        pavel@....cz, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        hpa@...or.com
Subject: Re: [Xen-devel] [PATCH 3/3] x86/xen: use guest_late_init to detect
 Xen PVH guest

On 08/11/17 13:26, Paolo Bonzini wrote:
> On 08/11/2017 13:24, Juergen Gross wrote:
>>> My understanding of Xen is very rusty at this point, but I think a
>>> "completely" legacy-free HVM domain will still have a PCI bus and the
>>> Xen platform device on that bus.
>>>
>>> A PVH domain just knows how to access the Xen PV features.
>>
>> A HVM domain does so, too. Today maybe only partially, but e.g. event
>> channels work in a HVM domain even without the Xen platform device.
>> Grant tables can be made working without the platform device, too,
>> and I'm already preparing a patch to do exactly that.
> 
> What about assigned PCI devices?  I think they are not PV pcifront for
> HVM.  So the main difference in the end is the PCI bus.

Sure, but this is easily detectable, isn't it?


Juergen