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Re: [Xen-devel] [BUG] After upgrade to Xen 4.12.0 iommu=no-igfx
- To: Roman Shaposhnik <roman@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 23 Jul 2019 19:12:54 +0100
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- Cc: "jgross@xxxxxxxx" <jgross@xxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, "jbeulich@xxxxxxxx" <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "boris.ostrovsky@xxxxxxxxxx" <boris.ostrovsky@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 23 Jul 2019 18:13:06 +0000
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On 23/07/2019 18:58, Roman Shaposhnik
wrote:
On Tue, Jul 23, 2019 at 10:50 AM Andrew Cooper
<andrew.cooper3@xxxxxxxxxx> wrote:
On 23/07/2019 18:48, Roman Shaposhnik wrote:
On Tue, Jul 23, 2019 at 10:35 AM Andrew Cooper
<andrew.cooper3@xxxxxxxxxx> wrote:
On 23/07/2019 18:32, Roman Shaposhnik wrote:
Hi Roger!
I applied your patch, removed no-igfx and I still see the original
problem. Please let me know what other logs/debugs would you need at
this point.
Please can you collect a full boot log with iommu=debug
How long of an output should I expect when iommu=debug is enabled?
I've just enabled it and I'm looking at what appears to be an endless
scroll of debug info.
This is all I see for the good 5 minutes at this point. Culminating with:
(XEN) (XEN) APIC error on CPU0: 40(00)
and a failure to boot.
Note that this is still without no-igfx
I'm attaching the tail end of this log.
Sadly, what is useful is the head of the log, before it starts
complaining loudly about every DMA fault.
No worries. Take a look at the head of the log attached.
Btw, I'm kind of curious why iommu=debug would actually make it crash
The system is rather sickly, and is debugging at a rate slower than
incoming faults, which is going to starve whichever CPU is taking
the IOMMU interrupt.
I wouldn't worry about the APIC error now.
Curiously, there is one single intremap error on boot, which is
likely unrelated.
(XEN) [VT-D]INTR-REMAP: Request device [0000:f0:1f.0] fault index 0, iommu reg = ffff82c0008e0000
(XEN) [VT-D]INTR-REMAP: reason 22 - Present field in the IRTE entry is clear
This will be irq0 from the IO-APIC.
Can you try booting following the guidance from
(XEN) [VT-D]found ACPI_DMAR_RMRR:
(XEN) [VT-D] RMRR address range 8d800000..8fffffff not in reserved memory; need "iommu_inclusive_mapping=1"?
(XEN) [VT-D] endpoint: 0000:00:02.0
which I noted on my first reply? Given that Rogers patch didn't
help, something else is going on.
~Andrew
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