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Re: [PATCH] xen/pt: Emulate multifunction bit in header type

To: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
From: Paul Durrant <xadimgnik@xxxxxxxxx>
Date: Mon, 6 Nov 2023 15:53:56 +0000
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony Perard <anthony.perard@xxxxxxxxxx>, qemu-devel@xxxxxxxxxx
Delivery-date: Mon, 06 Nov 2023 15:54:13 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 03/11/2023 17:26, Ross Lagerwall wrote:

The intention of the code appears to have been to unconditionally set
the multifunction bit but since the emulation mask is 0x00 it has no
effect. Instead, emulate the bit and set it based on the multifunction
property of the PCIDevice (which can be set using QAPI).

This allows making passthrough devices appear as functions in a Xen
guest.

Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>


Reviewed-by: Paul Durrant <paul@xxxxxxx>

References:
- [PATCH] xen/pt: Emulate multifunction bit in header type
  - From: Ross Lagerwall

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