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xen-devel
Re: [Xen-devel] Problem: Pattern with vertical colored lines on the dom0
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To: |
"Kay, Allen M" <allen.m.kay@xxxxxxxxx> |
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Subject: |
Re: [Xen-devel] Problem: Pattern with vertical colored lines on the dom0 screen |
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From: |
Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx> |
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Date: |
Thu, 30 Sep 2010 09:58:25 +0200 |
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Cc: |
"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, "Han, Weidong" <weidong.han@xxxxxxxxx>, Pasi, Jean Guyader <jean.guyader@xxxxxxxxx> |
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Delivery-date: |
Thu, 30 Sep 2010 00:59:18 -0700 |
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v=1; a=rsa-sha256; c=simple/simple; d=ts.fujitsu.com; i=dietmar.hahn@xxxxxxxxxxxxxx; q=dns/txt; s=s1536b; t=1285833510; x=1317369510; h=from:to:subject:date:cc:references:in-reply-to: mime-version:content-transfer-encoding:message-id; z=From:=20Dietmar=20Hahn=20<dietmar.hahn@xxxxxxxxxxxxxx> |To:=20"Kay,=20Allen=20M"=20<allen.m.kay@xxxxxxxxx> |Subject:=20Re:=20[Xen-devel]=20Problem:=20Pattern=20with =20vertical=20colored=20lines=20on=20the=20dom0=20screen |Date:=20Thu,=2030=20Sep=202010=2009:58:25=20+0200|Cc:=20 Konrad=20Rzeszutek=20Wilk=20<konrad.wilk@xxxxxxxxxx>,=0D =0A=20Jean=20Guyader=20<jean.guyader@xxxxxxxxx>,=0D=0A=20 "xen-devel@xxxxxxxxxxxxxxxxxxx"=20<xen-devel@xxxxxxxxxxxx rce.com>,=0D=0A=20Pasi=20=0D=0A=20=3D?iso-8859-15?q?K=3DE 4rkk=3DE4inen?=3D=20<pasik@xxxxxx>,=0D=0A=20"Han,=20Weido ng"=20<weidong.han@xxxxxxxxx>,=0D=0A=20Keir=20Fraser=20<k eir@xxxxxxx>|References:=20<201009171520.11903.dietmar.ha hn@xxxxxxxxxxxxxx>=20<20100927164706.GC4741@xxxxxxxxxxxx> =20<987664A83D2D224EAE907B061CE93D5301605D89C0@orsmsx505. amr.corp.intel.com>|In-Reply-To:=20<987664A83D2D224EAE907 B061CE93D5301605D89C0@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> |MIME-Version:=201.0|Content-Transfer-Encoding:=207bit |Message-Id:=20<201009300958.26368.dietmar.hahn@xxxxxxxxx u.com>; bh=HBqRTVqOz6hEzzdnlsrnmvsrAn93bsvcg7delkcHQSk=; b=B7s9iTJki/D02ilRqDJWtVxnZQnINijaqoNLW2rX4WiJ7fXNkGNNLWWk jBse8VFxyuRngRAI7CAWbN4FQF2QwJjbjE5nwqEHR6KmONAQW6+jJAjOc gPVfVAVa/Z9GTD7vFbl0pKoYHHS5IrecFnNBniAK8deh3rALfluo+mImU 1nSn6YSe1UHl1LAmdHaIyiUDihesFUcfG7DFpM682OxCCcLh/sT7HW3VT r2z9deA0AvylP+LSql4onpCIDZAhO; |
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Hi Allen,
Am 30.09.2010 schrieb Kay, Allen M:
> Attached patch fixes dom0 graphics problem on Levnovo T410 when VT-d is
> enabled. The patch is derived from a similar quirk in Linux kernel by David
> Woodhouse and Adam Jackson. It checks for VT enabling bit in IGD GGC
> register. If VT is not enabled correctly in the IGD, Xen does not enable
> VT-d translation for IGD VT-d engine. In case where iommu boot parameter is
> set to force, Xen calls panic().
This worked for my Fujitsu S760 too!
Thanks.
Dietmar.
>
> Signed-off-by: Allen Kay allen.m.kay@xxxxxxxxx
>
> -----Original Message-----
> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> Sent: Monday, September 27, 2010 9:47 AM
> To: Dietmar Hahn; Han, Weidong; Kay, Allen M
> Cc: Jean Guyader; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Problem: Pattern with vertical colored lines on the
> dom0 screen
>
> On Mon, Sep 27, 2010 at 02:06:26PM +0200, Dietmar Hahn wrote:
> > Hi Jean,
> >
> > many thanks for this hint! This saved me a lot of time searching through
> > the specs.
> >
> > Am 24.09.2010 schrieb Jean Guyader:
> > > The problem we saw with that the bit 10 of the GCC (offset 0x52 on the
> > > PCH config space)
> > > wasn't set after the bios. This bit probably enable the shadow GTT
> > > (created with the GTT + vt-d).
> >
> > Yes, the same problem here!
> > I found the following patch, maybe something similar would help here too?
> > https://patchwork.kernel.org/patch/132771
>
> There looks to be another in the upstream kernels:
>
> check_tylersburg_isoch
> >
> > So I have to hit the bios development :-(
>
> Well, we should probably provide a quirk check in the Xen code.
>
> Copying the Intel folks to see if they any ideas on adding this in the Intel
> VT-d
> code paths. Or they might have already a patch ready for this?
> >
> > > The vertical stripes means GTT fault.
> > >
> > > Jean
> >
> > Many thanks!
> > Dietmar.
> >
>
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