Re: [Xen-devel] q35 support in Xen

[Jason Dickens <jdickens@xxxxxxxxxxxxxx>]

Hello Anthony,

See my response below.

Jason

On 6/27/2017 12:36 PM, Anthony PERARD wrote:
> On Tue, Jun 27, 2017 at 10:19:26AM +0100, Wei Liu wrote:
> > CC Anthony and Stefano
> >
> > On Mon, Jun 26, 2017 at 01:55:56PM -0400, Jason Dickens wrote:
> > > I would like to inquire about q35 support in Xen? As far as I have been able
> > > to tell, this has not been done? In the Xen version that I've been working
> > > with (4.4), libxl_dm overrides any "-machine" argument I try to pass to QEMU
> > > with "-machine xenfv". (it appears this still existing in the last version)
> > >
> > > In my case, I need q35 support because certain OVMF functionality requires
> > > the q35 architecture.
> By curiosity, which functionality of OVMF ?
I'm trying to get SMM functionality in OVMF, this only works with q35. I 
have since been informed that Xen may not support SMM mode in the 
firmware anyway and that adding it could be a significant effort.
> > > Can someone help with:
> > >
> > > 1. Is there a newer version of Xen that does support q35 emulation?
> No.
>
> > > 2. Has there been a determination of what has to change for q35? e.g., just
> > > ACPI?
> There is also some simple change in QEMU, about interrupt I think, and
> we need to teach hvmloader to recognize the new platform and do some
> initialisation.
I think the interrupt thing is support for SMI handlers in the firmware?
> > > 3. Are there plans to support this?
> I don't think there is. I did work on it in the past but it was not a
> priority. But patchs are always welcomed.
I would like to work towards full support of SMM in OVMF while on Xen 
and may well do some development in that area. I would certainly welcome 
a discussion and collaboration.
> Regards,

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