From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: fail to detect VT-D on Dell (optiplex 760)
Date: Wed, 31 Jul 2013 13:01:54 +0100
Message-ID: <51F8FCB2.9030706@citrix.com>
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To: "Dennis Lan (dlan)" <dennis.yxun@gmail.com>
Cc: xen-devel@lists.xenproject.org, IAN DELANEY <della5@iinet.com.au>
List-Id: xen-devel@lists.xenproject.org

On 31/07/13 12:13, Dennis Lan (dlan) wrote:
> HI Devs:
>  I have problem to boot with VT-D enabled on my machine, with
> Xen-4.3.0, it just hangs[0]. But with 4.4-unstable version, it boot
> successfully but still fail to detect iommu.
>
> I'm using xen-git master branch,commit: 6072b7c808043b6886c33f896e06fc32ee28346e
>
> also you can refer [1] for more information.
> interesting bits from xen-4.4-unstable, full log is here[2]
>
> (XEN) vmap(ffff82c000201000:0x1)
> (XEN) [VT-D]iommu.c:1167: IOMMU: unsupported
> (XEN) ---- print_iommu_regs ----
> (XEN)  drhd->address = fedc1000
> (XEN)  VER = ffffffff
> (XEN)  CAP = ffffffffffffffff
> (XEN)  n_fault_reg = 100
> (XEN)  fault_recording_offset = 3ff0
> (XEN)  ECAP = ffffffffffffffff
> (XEN)  GCMD = ffffffff
> (XEN)  GSTS = ffffffff
> (XEN)  RTADDR = ffffffffffffffff
> (XEN)  CCMD = ffffffffffffffff
> (XEN)  FSTS = ffffffff
> (XEN)  FECTL = ffffffff
> (XEN)  FEDATA = ffffffff
> (XEN)  FEADDR = ffffffff
> (XEN)  FEUADDR = ffffffff
> (XEN) vunmap(ffff82c000201000:0x1)
> (XEN) Failed to parse ACPI DMAR.  Disabling VT-d.
> (XEN) ERST table was not found
> (XEN) Using ACPI (MADT) for SMP configuration information

According to this, the DMAR table is problematic.  This is the ACPI
table which describes the IOMMU functionality.  Do you have a BIOS
upgrade available?

~Andrew

>
> btw, Ian, I also keep you CCed.
>
> [0] https://bugs.gentoo.org/show_bug.cgi?id=479082#c3
> [1] https://bugs.gentoo.org/show_bug.cgi?id=479082
> [2] https://479082.bugs.gentoo.org/attachment.cgi?id=354706
>
> Dennis Lan (dlan)
>
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