From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Ting-Wei Lan <lantw44@gmail.com>, xen-devel@lists.xen.org
Cc: Yang Zhang <yang.z.zhang@intel.com>,
Kevin Tian <kevin.tian@intel.com>,
Jan Beulich <jbeulich@suse.com>
Subject: Re: [PATCH] VT-d: add iommu=igfx_off option to workaround graphics issues
Date: Fri, 17 Jul 2015 20:36:22 +0100 [thread overview]
Message-ID: <55A95936.608@citrix.com> (raw)
In-Reply-To: <1437159952-4134-1-git-send-email-lantw44@gmail.com>
On 17/07/15 20:05, Ting-Wei Lan wrote:
> When using Linux >= 3.19 (commit 47591df) as dom0 on some Intel Ironlake
> devices, It is possible to encounter graphics issues that make screen
> unreadable or crash the system. It was reported in freedesktop bugzilla:
>
> https://bugs.freedesktop.org/show_bug.cgi?id=90037
>
> As we still cannot find a proper fix for this problem, this patch adds
> iommu=igfx_off option that is similar to Linux intel_iommu=igfx_off for
> users to manually workaround the problem.
>
> Signed-off-by: Ting-Wei Lan <lantw44@gmail.com>
If the identified Linux change is correct, then the problems is almost
certainly the i915 driver not using appropriate cache flushing
operations on memory of weakened caching type.
Are there any details available on if/how/what snoop features the IGD
and its IOMMU have?
~Andrew
next prev parent reply other threads:[~2015-07-17 19:36 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-17 19:05 [PATCH] VT-d: add iommu=igfx_off option to workaround graphics issues Ting-Wei Lan
2015-07-17 19:36 ` Andrew Cooper [this message]
2015-07-18 8:46 ` 藍挺瑋
2015-07-19 15:53 ` Julien Grall
2015-07-20 8:27 ` Andrew Cooper
2015-07-20 10:19 ` Julien Grall
2015-07-20 1:28 ` Tian, Kevin
2015-07-20 8:21 ` Andrew Cooper
2015-07-20 10:44 ` Ting-Wei Lan
2015-07-21 0:57 ` Tian, Kevin
2015-07-21 6:56 ` Jan Beulich
2015-07-21 7:05 ` Tian, Kevin
2015-07-21 7:16 ` Jan Beulich
2015-07-21 7:23 ` Tian, Kevin
2015-07-21 7:33 ` Jan Beulich
2015-07-23 16:41 ` Ting-Wei Lan
2015-07-20 8:46 ` Jan Beulich
2015-07-25 16:57 ` [PATCH v2] VT-d: add iommu=igfx " Ting-Wei Lan
2015-07-26 16:47 ` Andrew Cooper
2015-07-31 1:26 ` Tian, Kevin
2015-07-31 8:37 ` Ting-Wei Lan
2015-08-04 2:00 ` Tian, Kevin
2015-08-05 9:11 ` [PATCH v3] " Ting-Wei Lan
2015-08-05 12:18 ` Andrew Cooper
2015-08-05 13:35 ` Wei Liu
2015-08-05 17:10 ` [PATCH v4] " Ting-Wei Lan
2015-08-06 0:49 ` Tian, Kevin
2015-08-06 8:25 ` Wei Liu
2015-08-06 9:28 ` Ian Campbell
2015-07-20 12:12 ` [PATCH] VT-d: add iommu=igfx_off " Andrew Cooper
2015-07-20 12:24 ` Jan Beulich
2015-07-20 12:34 ` Andrew Cooper
2015-07-20 13:55 ` Jan Beulich
2015-07-20 14:12 ` Andrew Cooper
2015-07-20 14:25 ` Jan Beulich
2015-07-21 1:15 ` Tian, Kevin
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