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

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Message-ID: <Z84pue7eIjr0VtrE@liuwe-devbox-ubuntu-v2.lamzopl0uupeniq2etz1fddiyg.xx.internal.cloudapp.net>
Date: Sun, 9 Mar 2025 23:52:25 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Helge Deller <deller@....de>
Cc: Michael Kelley <mhklinux@...look.com>,
	"wei.liu@...nel.org" <wei.liu@...nel.org>,
	"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 Sun, Mar 09, 2025 at 03:20:04PM +0100, Helge Deller wrote:
> 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.

I can pick up all hyperv-fbdev patches in the future. Thanks Helge.

Wei.

> 
> Helge