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

From: Paolo Bonzini
Date: Wed Dec 10 2014 - 11:59:21 EST

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.

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