Re: PCI passthrough support for PVH mode

[Julien Grall <julien@xxxxxxx>]

Hi Bertrand,

On 10/02/2022 08:32, Bertrand Marquis wrote:
> > On 10 Feb 2022, at 07:22, tosher 1 <akm2tosher@xxxxxxxxx> wrote:
> >
> > Hi Jan,
> >
> > Thanks for letting me know this status.
> >
> > I am wondering if PCI passthrough is at least available in Arm for other 
> > virtualization modes like PV, HVM, or PVHVM. For example, is it possible for 
> > someone to attach a PCI device to a guest domain on an Arm machine and use that 
> > domain as a driver domain, like we can do with the Xen on x86?
> On arm there is only one virtualization mode which is equivalent to x86 HVM.
I would like to correct this. Arm guests are more equivalent to x86 PVH 
than HVM. For more details, see:
https://wiki.xenproject.org/wiki/Understanding_the_Virtualization_Spectrum#PVH:

This is also why we need a brand new solution for PCI passthrough rather 
than piggying back on what was done on HVM in QEMU :).
Cheers,

--
Julien Grall