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Re: x86/HVM: Linux'es apic_pending_intr_clear() warns about stale IRR
- To: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 3 Nov 2022 09:48:20 +0100
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- Cc: Roger Pau Monne <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 03 Nov 2022 08:48:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31.10.2022 19:37, Andrew Cooper wrote:
> On 31/10/2022 15:55, Jan Beulich wrote:
>> Hello,
>>
>> quite likely this isn't new, but I've ended up noticing it only recently:
>> On an oldish system where I hand a HVM guest an SR-IOV NIC (not sure yet
>> whether that actually matters) all APs have that warning issued, with all
>> reported values zero except for the very first IRR one - that's 00080000.
>> Which is suspicious by itself, for naming vector 0x13, i.e. below 0x20
>> and hence within CPU exception range.
>
> To be clear, these are the VM's APs ?
Yes. I'm now also pretty sure this is a Linux side issue, as I've verified
it to be new in 6.0. Debugging is complicated some by the host not being
very reliable anymore - the SR-IOV card has been producing floods of
corrected errors for a long time, but recently apparently uncorrected
errors have been occurring every now and then, resulting in a host reset.
But I'll keep trying to see if I can spot where this behavior is coming
from.
Jan
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