[Xen-devel] fail to detect VT-D on Dell (optiplex 760)

["Dennis Lan (dlan)" <dennis.yxun@xxxxxxxxx>]

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

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)

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel