From: "Jan Beulich" <JBeulich@suse.com>
To: Thierry Laurion <thierry.laurion@gmail.com>
Cc: xen-devel@lists.xen.org
Subject: Re: pre Sandy bridge IOMMU support (gm45)
Date: Mon, 25 Jan 2016 07:30:29 -0700 [thread overview]
Message-ID: <56A63F9502000078000CAAD1@prv-mh.provo.novell.com> (raw)
In-Reply-To: <CAAzJznzyDqyuSBZOJowGnFKDBKYSTrhLge18wggG0uycYHPaRQ@mail.gmail.com>
>>> On 23.01.16 at 08:38, <thierry.laurion@gmail.com> wrote:
> Thinkpad x200 p8600 laptops have vt-d, vt-x and tpm. They also have intel
> integrated graphics 4 Series (gm45 chipset), supported through i915 driver.
>
> In December, a fix got introduced to Xen 4.6 through iommu=no-igfx switch.
> Before that fix, it was impossible to boot xen without passing iommu=0.
>
> With iommu=no-igfx passed on, Qubes boots xen, kernel, dom0 and domu until
> some graphic rendering is done from a domu to dom0 xserver.
>
> I'm trying to push forward IOMMU support of gm45 chipset here. The problem
> is between i915 and xen iommu support for sure, but there is no crash or
> interesting debugging information given on a serial console.
To be honest, even after having read you second mail I'm not quite
clear what it you want and/or what doesn't work. Adding some
guessing, I could interpret the above as you wanting to pass through
the graphics device. If that's the case, then this is quite clearly a
pretty bad idea with the IOMMU behind it disabled.
Jan
next prev parent reply other threads:[~2016-01-25 14:30 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-23 7:38 pre Sandy bridge IOMMU support (gm45) Thierry Laurion
2016-01-24 18:21 ` Thierry Laurion
2016-01-24 23:45 ` [qubes-devel] " Marek Marczykowski-Górecki
2016-01-26 21:10 ` Thierry Laurion
2016-01-27 5:08 ` Thierry Laurion
2016-01-29 17:52 ` Thierry Laurion
2016-01-25 10:01 ` Andrew Cooper
2016-01-25 14:30 ` Jan Beulich [this message]
2016-01-25 21:49 ` Thierry Laurion
2016-01-26 10:52 ` Jan Beulich
[not found] ` <CAAzJznxr4CT8J0fnx1kkWfQ+56J0PH+QBjgjH=6phtzbDd4dyw@mail.gmail.com>
2016-01-26 11:37 ` Jan Beulich
2016-01-26 11:57 ` Thierry Laurion
2016-01-26 12:27 ` Jan Beulich
2016-01-26 22:21 ` Tian, Kevin
2016-01-26 23:39 ` Thierry Laurion
2016-01-30 1:47 ` Marek Marczykowski-Górecki
2016-02-01 7:59 ` Jan Beulich
2016-02-01 12:28 ` Marek Marczykowski-Górecki
2016-02-01 12:35 ` Jan Beulich
2016-02-20 18:20 ` Thierry Laurion
2016-02-21 3:45 ` Thierry Laurion
2016-02-28 19:08 ` Thierry Laurion
2016-06-26 23:47 ` Thierry Laurion
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