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Re: [PATCH] x86/pvh: fix identity mapping of low 1MB
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 13 Oct 2023 10:51:50 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Henry Wang <Henry.Wang@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Fri, 13 Oct 2023 08:52:07 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, Oct 13, 2023 at 10:39:06AM +0200, Roger Pau Monné wrote:
> On Thu, Oct 12, 2023 at 12:48:20AM +0800, Andrew Cooper wrote:
> > On 11/10/2023 11:37 pm, Roger Pau Monne wrote:
> > But a question first. Is this from debugging the XSA-442 fallout? If
> > so, it's probably worth mentioning the hardware we saw this on (which
> > IIRC was fairly old AMD), and that XSA-442 unmasked a pre-existing bug.
> > And we think it's USB/PS2 emulation?
>
> Yeah, can add this all. It is triggered by pinot{0,1} which is AMD
> Fam15h (AMD Opteron(tm) Processor 3350 HE).
Just re-checked this in order to be sure, and no, the IOMMU faults are
already there prior to XSA-442 for the dom0pvh tests, but they don't
cause issues to osstest, and hence we didn't realize. I just came
across those as I was triaging a different issue and looking at the
serial log.
Hence I won't add any mentions to XSA-442 in the commit message.
Thanks, Roger.
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