AMD IOMMU: allow command line overrides for broken IVRS tables

With there being so many systems with broken ACPI tables, and with it
generally being known what's wrong with those tables, give people a
handle to overcome the resulting disabling of their IOMMUs.

Inspired by Linux side patches providing similar functionality.

Suggested-by: Sander Eikelenboom <linux@eikelenboom.it>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Tested-By: Sander Eikelenboom <linux@eikelenboom.it>
Acked-by: Keir Fraser <keir@xen.org>
Acked-by: Suravee Suthikulpanit <suravee.suthikulapanit@amd.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
index 13c0306c61..a86014b4d6 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -578,6 +578,20 @@ debug hypervisor only).
 > `= <integer>`
 
 ### irq\_vector\_map
+### ivrs_hpet[`<hpet>`]
+> `=[<seg>:]<bus>:<device>.<func>`
+
+Force the use of `[<seg>:]<bus>:<device>.<func>` as device ID of HPET
+`<hpet>` instead of the one specified by the IVHD sub-tables of the IVRS
+ACPI table.
+
+### ivrs_ioapic[`<ioapic>`]
+> `=[<seg>:]<bus>:<device>.<func>`
+
+Force the use of `[<seg>:]<bus>:<device>.<func>` as device ID of IO-APIC
+`<ioapic>` instead of the one specified by the IVHD sub-tables of the IVRS
+ACPI table.
+
 ### lapic
 
 Force the use of use of the local APIC on a uniprocessor system, even