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Re: [regression] Re: [PATCH v2 2/2] iommu/vt-d: switch to common RMRR checker
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 14 Feb 2024 10:01:43 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 14 Feb 2024 09:01:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.02.2024 09:45, Roger Pau Monné wrote:
> On Wed, Feb 14, 2024 at 08:45:28AM +0100, Jan Beulich wrote:
>> On 13.02.2024 23:37, Andrew Cooper wrote:
>>> It's very likely something in this series, but the link to Intel might
>>> just be chance of which hardware got selected, and I've got no clue why
>>> there's a reset with no further logging out of Xen...
>>
>> I second this - even after looking closely at the patches again, I can't
>> make a connection between them and the observed behavior. Didn't yet look
>> at what, if anything, osstest may have to say. Do I understand correctly
>> that the cited log messages are the last sign of life prior to the
>> systems rebooting?
>
> I've found it:
>
> for ( addr = start; mfn_x(addr) <= mfn_x(end); mfn_add(addr, 1) )
>
> Should be:
>
> for ( addr = start; mfn_x(addr) <= mfn_x(end); addr = mfn_add(addr, 1) )
>
> mfn_add() doesn't modify the parameter. Will see about making those
> helpers __must_check in order to avoid this happening in the future.
Hmm, yes, it's not the first time this has happened. But even seeing the
flaw I still can't explain the observed behavior: The system ought to
hang then, not instantly reboot?
Jan
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