linux-kernel - Re: [PATCH] x86/resctrl: Fix buggy overflow when reactivating previously Unavailable RMID

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Message-ID: <1b352ad2-e542-4005-a470-5a9bb94b7ad8@intel.com>
Date: Tue, 7 Oct 2025 20:04:49 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: "Moger, Babu" <bmoger@....com>, Babu Moger <babu.moger@....com>,
	<tony.luck@...el.com>, <Dave.Martin@....com>, <james.morse@....com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>, <eranian@...gle.com>, <gautham.shenoy@....com>
Subject: Re: [PATCH] x86/resctrl: Fix buggy overflow when reactivating
 previously Unavailable RMID

Hi Babu,

On 10/7/25 4:47 PM, Moger, Babu wrote:
> On 10/7/2025 3:23 PM, Reinette Chatre wrote:
>> On 10/6/25 4:13 PM, Babu Moger wrote:

...

>>> ---
>>>
>>> Tested this on multiple AMD systems, but not on Intel systems.
>>> Need help with that. If everything goes well, this patch needs to
>>> go to all the stable kernels.
>>
>> Needs a "Fixes" and "Cc: stable@...r.kernel.org"?
> 
> Hmm.. Not sure. Which commit to add Fixes in. This is AMD related.
> We should have taken care when adding support to AMD. Does this commit make sense?
> 
> Fixes: 4d05bf71f157d ("x86/resctrl: Introduce AMD QOS feature")

This seems fair. From what I can tell this spans all LTS kernels so I expect
a couple of different variants of this fix since this code has evolved quite a lot.
Do you want this fix backported to all the LTS kernels?
It may be useful to add a note to the stable team that this patch needs changes to
apply to all kernel versions (see "Point out known problems"
in Documentation/process/stable-kernel-rules.rst)

>> This patch will only apply to upstream though so would need backporting
>> support. Will you be able to support this?
> 
> Yes. I can do that.

Thank you very much.

Reinette