linux-kernel - Re: [PATCH 1/1] fbdev: hyperv_fb: Fix hang in kdump kernel when on Hyper-V Gen 2 VMs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <fc8f7246-2e05-4433-85d8-65dbed723826@gmx.de>
Date: Sun, 9 Mar 2025 15:20:04 +0100
From: Helge Deller <deller@....de>
To: Michael Kelley <mhklinux@...look.com>,
 "wei.liu@...nel.org" <wei.liu@...nel.org>
Cc: "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
 "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: Re: [PATCH 1/1] fbdev: hyperv_fb: Fix hang in kdump kernel when on
 Hyper-V Gen 2 VMs

On 3/9/25 05:10, Michael Kelley wrote:
> From: Helge Deller <deller@....de> Sent: Saturday, March 8, 2025 6:59 PM
>>
>> On 2/19/25 00:01, mhkelley58@...il.com wrote:
>>> From: Michael Kelley <mhklinux@...look.com>
>>>
> [snip]
>
>>>
>>> Reported-by: Thomas Tai <thomas.tai@...cle.com>
>>> Fixes: c25a19afb81c ("fbdev/hyperv_fb: Do not clear global screen_info")
>>> Signed-off-by: Michael Kelley <mhklinux@...look.com>
>>> ---
>>> The "Fixes" tag uses commit c25a19afb81c because that's where the problem
>>> was re-exposed, and how far back a stable backport is needed. But I've
>>> taken a completely different, and hopefully better, approach in the
>>> solution that isn't related to the code changes in c25a19afb81c.
>>>
>>>    drivers/video/fbdev/hyperv_fb.c | 20 +++++++++++++-------
>>>    1 file changed, 13 insertions(+), 7 deletions(-)
>>
>> applied to fbdev tree.
>>
>
> Thank you!
>
> Related, I noticed the patch "fbdev: hyperv_fb: iounmap() the correct
> memory when removing a device" is also in the fbdev for-next branch.
> Wei Liu previously applied this patch to the hyperv-fixes tree (see [1])
> and it's already in linux-next. Won't having it also in fbdev produce a
> merge conflict?
> [1] https://lore.kernel.org/linux-hyperv/Z6wHDw8BssJyQHiM@liuwe-devbox-debian-v2/

Thanks Michael!
I now dropped that patch from the fbdev tree to avoid collisions.

Btw, I'm fine if we agree that all hyperv-fbdev fixes & patches go through
hyperv or other trees. Just let me know.

Helge