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Re: [Xen-devel] Powerdown problem on XEN | ACPI S5

Hi again Andrew,
interestingly enough, the new WARN() did not trigger.

The output on the serial console only grossly lists the same information from the WARN() in qinval.c:223 we have already seen before.

In any case, please find the (this time: complete) new log attached to this mail.

BTW I have double-checked, whether I have copied the correct file to /boot by grepping for your "**Debug: ..." message and it was found in the (uncompressed) xen-test.gz file which is started from grub.

Many thanks again.

Am 14.08.13 20:40, schrieb Atom2:
Hi Andrew

Am 14.08.13 19:30, schrieb Andrew Cooper:
Do you have the boot time dmesg output?
Sure, please see the attached log file. Please note that this dmesg data
comes from a system that I have booted from the standard XEN 4.2.2
kernel (i.e. w/o the WARN() statement and the various printk statements
I have added; furthermore this was w/o the serial console being active)

The problem here is that a queued_invalidate wait descriptor has been
issued, and has not been completed within 1 second.  In all previous
cases I have debugged, this is actually because we already turned off
the IOMMU, then tried to turn it off again.

Could you perhaps try with this patch as well?

diff --git a/xen/drivers/passthrough/vtd/iommu.c
index 071a91b..45fff48 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -791,6 +791,9 @@ static void iommu_disable_translation(struct iommu
      u32 sts;
      unsigned long flags;

+    printk("**Debug: Disabling translation for iommu %"PRId32"\n",
+    WARN();
      /* apply platform specific errata workarounds */
I'll get back to you in due course with the log output after I have
applied the patch and restarted & then shutdown XEN again.


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