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Re: [PATCH 0/1] KVM support for VMD devices
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From: |
Derrick, Jonathan |
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Subject: |
Re: [PATCH 0/1] KVM support for VMD devices |
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Date: |
Thu, 23 Apr 2020 15:18:10 +0000 |
On Wed, 2020-04-22 at 23:16 -0700, Christoph Hellwig wrote:
> On Wed, Apr 22, 2020 at 01:14:44PM -0400, Jon Derrick wrote:
> > The two patches (Linux & QEMU) add support for passthrough VMD devices
> > in QEMU/KVM. VMD device 28C0 already supports passthrough natively by
> > providing the Host Physical Address in a shadow register to the guest
> > for correct bridge programming.
> >
> > The QEMU patch emulates the 28C0 mode by creating a shadow register and
> > advertising its support by using QEMU's subsystem vendor/id.
> > The Linux patch matches the QEMU subsystem vendor/id to use the shadow
> > register.
>
> Please pick a different PCI ID for Qemu vs real hardware so that we
> can properly quirk them if they end up behaving differently due to
> hardware or software bugs.
Sure. Will look into that.
Thanks Christoph
Jon