linux-kernel - Re: [Intel-gfx] [ANNOUNCE][RFC] KVMGT - the implementation of Intel GVT-g(full GPU virtualization) for KVM

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Date:	Wed, 10 Dec 2014 17:59:05 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Tian, Kevin" <kevin.tian@...el.com>,
	Gerd Hoffmann <kraxel@...hat.com>,
	"Song, Jike" <jike.song@...el.com>
CC:	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"White, Michael L" <michael.l.white@...el.com>,
	"Dong, Eddie" <eddie.dong@...el.com>,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	"Li, Susie" <susie.li@...el.com>,
	"Cowperthwaite, David J" <david.j.cowperthwaite@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Haron, Sandra" <sandra.haron@...el.com>
Subject: Re: [Intel-gfx] [ANNOUNCE][RFC] KVMGT - the implementation of Intel
 GVT-g(full GPU virtualization) for KVM



On 09/12/2014 03:49, Tian, Kevin wrote:
> - Now we have XenGT/KVMGT separately maintained, and KVMGT lags
> behind XenGT regarding to features and qualities. Likely you'll continue
> see stale code (like Xen inst decoder) for some time. In the future we
> plan to maintain a single kernel repo for both, so KVMGT can share
> same quality as XenGT once KVM in-kernel dm framework is stable.
> 
> - Regarding to Qemu hacks, KVMGT really doesn't have any different 
> requirements as what have been discussed for GPU pass-through, e.g. 
> about ISA bridge. Our implementation is based on an old Qemu repo, 
> and honestly speaking not cleanly developed, because we know we
> can leverage from GPU pass-through support once it's in Qemu. At 
> that time we'll leverage the same logic with minimal changes to 
> hook KVMGT mgmt. APIs (e.g. create/destroy a vGPU instance). So
> we can ignore this area for now. :-)

Could the virtual device model introduce new registers in order to avoid
poking at the ISA bridge?  I'm not sure that you "can leverage from GPU
pass-through support once it's in Qemu", since the Xen IGD passthrough
support is being added to a separate machine that is specific to Xen IGD
passthrough; no ISA bridge hacking will probably be allowed on the "-M
pc" and "-M q35" machine types.

Paolo
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