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Re: [PATCH for-4.17] x86/pci: allow BARs to be positioned on e820 reserved regions
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Thu, 6 Oct 2022 11:43:21 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu, Oct 06, 2022 at 11:02:32AM +0200, Jan Beulich wrote:
> On 06.10.2022 10:48, Roger Pau Monné wrote:
> > On Wed, Oct 05, 2022 at 05:42:08PM +0200, Jan Beulich wrote:
> >> Or put in different words - how
> >> likely is it that we could first gain understanding on their
> >> intentions with this region? You did say the system hangs hard without
> >> some kind of workaround, but that doesn't clarify to me in how far a
> >> use of the device by the firmware was actually involved there.
> >
> > It's a black box to me, so I have no idea what the firmware attempts
> > to do.
>
> Right - I don't expect there's a realistic chance of getting hold of a
> firmware person of theirs.
Even if somehow I could manage to do that (which I think it's
unlikely), it's not going to happen before the release, and there are
production boxes out there that have this behavior and we need to deal
with them.
Thanks, Roger.
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