From: Dexuan Cui <decui@microsoft.com>
To: Vineeth Pillai <viremana@linux.microsoft.com>,
Wei Liu <wei.liu@kernel.org>, vkuznets <vkuznets@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"linux-fbdev@vger.kernel.org" <linux-fbdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Michael Kelley <mikelley@microsoft.com>
Subject: RE: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver
Date: Fri, 4 Jun 2021 18:16:54 +0000 [thread overview]
Message-ID: <MW2PR2101MB0892518BB763E7D8137E2590BF3B9@MW2PR2101MB0892.namprd21.prod.outlook.com> (raw)
In-Reply-To: <e5c90203-df8c-1e72-f77d-41db4ff5413f@linux.microsoft.com>
> From: Vineeth Pillai <viremana@linux.microsoft.com>
> Sent: Friday, June 4, 2021 8:47 AM
> To: Wei Liu <wei.liu@kernel.org>; vkuznets <vkuznets@redhat.com>
> Cc: Matthew Wilcox <willy@infradead.org>; dri-devel@lists.freedesktop.org;
> linux-hyperv@vger.kernel.org; linux-fbdev@vger.kernel.org;
> linux-kernel@vger.kernel.org; Michael Kelley <mikelley@microsoft.com>;
> Dexuan Cui <decui@microsoft.com>
> Subject: Re: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom
> address_space_operations") breaks Hyper-V FB driver
>
>
> On 6/4/2021 9:00 AM, Wei Liu wrote:
> > On Fri, Jun 04, 2021 at 02:25:01PM +0200, Vitaly Kuznetsov wrote:
> >> Hi,
> >>
> >> Commit ccf953d8f3d6 ("fb_defio: Remove custom
> address_space_operations")
> >> seems to be breaking Hyper-V framebuffer
> >> (drivers/video/fbdev/hyperv_fb.c) driver for me: Hyper-V guest boots
> >> well and plymouth even works but when I try starting Gnome, virtual
> >> screen just goes black. Reverting the above mentioned commit on top of
> >> 5.13-rc4 saves the day. The behavior is 100% reproducible. I'm using
> >> Gen2 guest runing on Hyper-V 2019. It was also reported that Gen1 guests
> >> are equally broken.
> >>
> >> Is this something known?
> >>
> > I've heard a similar report from Vineeth but we didn't get to the bottom
> > of this.
> I have just tried reverting the commit mentioned above and it solves the
> GUI freeze
> I was also seeing. Previously, login screen was just freezing, but VM
> was accessible
> through ssh. With the above commit reverted, I can login to Gnome.
>
> Looks like I am also experiencing the same bug mentioned here.
>
> Thanks,
> Vineeth
As Matthew mentioned, this is a known issue:
https://lwn.net/ml/linux-kernel/YLZEhv0cpZp8uVE3@casper.infradead.org/
Matthew has reverted ccf953d8f3d6:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0b78f8bcf4951af30b0ae83ea4fad27d641ab617
so the latest mainline should work now.
Thanks,
Dexuan
next prev parent reply other threads:[~2021-06-04 18:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-04 12:25 [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver Vitaly Kuznetsov
2021-06-04 13:00 ` Wei Liu
2021-06-04 15:47 ` Vineeth Pillai
2021-06-04 18:16 ` Dexuan Cui [this message]
2021-06-04 18:37 ` Dexuan Cui
2021-06-04 18:52 ` Matthew Wilcox
2021-06-04 13:31 ` Matthew Wilcox
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