linux-kernel - Re: [PATCH v2 00/11] Remove device private pages from physical address space

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Message-ID: <aWCerW4QP0t7CrC8@lstrano-desk.jf.intel.com>
Date: Thu, 8 Jan 2026 22:22:37 -0800
From: Matthew Brost <matthew.brost@...el.com>
To: Jordan Niethe <jniethe@...dia.com>
CC: <linux-mm@...ck.org>, <balbirs@...dia.com>, <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
	<david@...hat.com>, <ziy@...dia.com>, <apopple@...dia.com>,
	<lorenzo.stoakes@...cle.com>, <lyude@...hat.com>, <dakr@...nel.org>,
	<airlied@...il.com>, <simona@...ll.ch>, <rcampbell@...dia.com>,
	<mpenttil@...hat.com>, <jgg@...dia.com>, <willy@...radead.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <intel-xe@...ts.freedesktop.org>,
	<jgg@...pe.ca>, <Felix.Kuehling@....com>
Subject: Re: [PATCH v2 00/11] Remove device private pages from physical
 address space

On Fri, Jan 09, 2026 at 12:27:50PM +1100, Jordan Niethe wrote:
> Hi
> On 9/1/26 11:31, Matthew Brost wrote:
> > On Fri, Jan 09, 2026 at 11:01:13AM +1100, Jordan Niethe wrote:
> > > Hi,
> > > 
> > > On 8/1/26 16:42, Jordan Niethe wrote:
> > > > Hi,
> > > > 
> > > > On 8/1/26 13:25, Jordan Niethe wrote:
> > > > > Hi,
> > > > > 
> > > > > On 8/1/26 05:36, Matthew Brost wrote:
> > > > > > 
> > > > > > Thanks for the series. For some reason Intel's CI couldn't apply this
> > > > > > series to drm-tip to get results [1]. I'll manually apply this
> > > > > > and run all
> > > > > > our SVM tests and get back you on results + review the changes here. For
> > > > > > future reference if you want to use our CI system, the series must apply
> > > > > > to drm-tip, feel free to rebase this series and just send to intel-xe
> > > > > > list if you want CI
> > > > > 
> > > > > Thanks, I'll rebase on drm-tip and send to the intel-xe list.
> > > > 
> > > > For reference the rebase on drm-tip on the intel-xe list:
> > > > 
> > > > https://patchwork.freedesktop.org/series/159738/
> > > > 
> > > > Will watch the CI results.
> > > 
> > > The series causes some failures in the intel-xe tests:
> > > https://patchwork.freedesktop.org/series/159738/#rev4
> > > 
> > > Working through the failures now.
> > > 
> > 
> > Yea, I saw the failures. I haven't had time look at the patches on my
> > end quite yet. Scrabling to get a few things in 6.20/7.0 PR, so I may
> > not have bandwidth to look in depth until mid next week but digging is
> > on my TODO list.
> 
> Sure, that's completely fine. The failures seem pretty directly related to
> the
> series so I think I'll be able to make good progress.
> 
> For example https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-159738v4/bat-bmg-2/igt@xe_evict@evict-beng-small.html
> 
> It looks like I missed that xe_pagemap_destroy_work() needs to be updated to
> remove the call to devm_release_mem_region() now we are no longer reserving
> a mem
> region.

+1

So this is the one I’d be most concerned about [1].
xe_exec_system_allocator is our SVM test, which does almost all the
ridiculous things possible in user space to stress SVM. It’s blowing up
in the core MM—but the source of the bug could be anywhere (e.g., Xe
SVM, GPU SVM, migrate device layer, or core MM). I’ll try to help when I
have bandwidth.

Matt

[1] https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-159738v4/shard-bmg-9/igt@xe_exec_system_allocator@threads-many-large-execqueues-free-nomemset.html

> 
> 
> Thanks,
> Jordan.
> 
> > 
> > Matt
> > 
> > > Thanks,
> > > Jordan.
> > > 
> > > > 
> > > > Thanks,
> > > > Jordan.
> > > > 
> > > > > 
> > > > > Jordan.
> > > > > 
> > > > > > 
> > > > > > I was also wondering if Nvidia could help review one our core MM patches
> > > > > > [2] which is gating enabling 2M device pages too?
> > > > > > 
> > > > > > Matt
> > > > > > 
> > > > > > [1] https://patchwork.freedesktop.org/series/159738/
> > > > > > [2] https://patchwork.freedesktop.org/patch/694775/?series=159119&rev=1
> > > > > 
> > > > > 
> > > > 
> > > 
>