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Re: [XEN PATCH v9 3/5] x86/pvh: Add PHYSDEVOP_setup_gsi for PVH dom0


  • To: Jiqian Chen <Jiqian.Chen@xxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Mon, 10 Jun 2024 18:04:44 +0200
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony@xxxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "Daniel P . Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Stewart Hildebrand <Stewart.Hildebrand@xxxxxxx>, Huang Rui <Ray.Huang@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 10 Jun 2024 16:05:09 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 07.06.2024 10:11, Jiqian Chen wrote:
> On PVH dom0, the gsis don't get registered, but
> the gsi of a passthrough device must be configured for it to
> be able to be mapped into a hvm domU.
> On Linux kernel side, it calles PHYSDEVOP_setup_gsi for
> passthrough devices to register gsi when dom0 is PVH.

"it calls" implies that ...

> So, add PHYSDEVOP_setup_gsi for above purpose.
> 
> Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
> Signed-off-by: Jiqian Chen <Jiqian.Chen@xxxxxxx>
> ---
> The code link that will call this hypercall on linux kernel side is as follows
> https://lore.kernel.org/lkml/20240607075109.126277-3-Jiqian.Chen@xxxxxxx/T/#u

... the code only to be added there would already be upstream. As I think the
hypervisor change wants to come first, this part of the description will want
re-wording to along the lines of "will need to" or some such.

As to GSIs not being registered: If that's not a problem for Dom0's own
operation, I think it'll also want/need explaining why what is sufficient for
Dom0 alone isn't sufficient when pass-through comes into play.

Jan



 


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