path: root/Documentation/kernel-parameters.txt
diff options
authorSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>2016-08-23 13:52:32 -0500
committerJoerg Roedel <jroedel@suse.de>2016-09-05 12:41:46 +0200
commit3928aa3f5775fc4e40117077e97d73d8526039c9 (patch)
tree4694f5be6a1013a1c159425f0df465b48034435b /Documentation/kernel-parameters.txt
parent29b4817d4018df78086157ea3a55c1d9424a7cfc (diff)
iommu/amd: Detect and enable guest vAPIC support
This patch introduces a new IOMMU driver parameter, amd_iommu_guest_ir, which can be used to specify different interrupt remapping mode for passthrough devices to VM guest: * legacy: Legacy interrupt remapping (w/ 32-bit IRTE) * vapic : Guest vAPIC interrupt remapping (w/ GA mode 128-bit IRTE) Note that in vapic mode, it can also supports legacy interrupt remapping for non-passthrough devices with the 128-bit IRTE. Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 46c030a49186..748ef7bdd64d 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -460,6 +460,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
driver will print ACPI tables for AMD IOMMU during
IOMMU initialization.
+ amd_iommu_intr= [HW,X86-64]
+ Specifies one of the following AMD IOMMU interrupt
+ remapping modes:
+ legacy - Use legacy interrupt remapping mode.
+ vapic - Use virtual APIC mode, which allows IOMMU
+ to inject interrupts directly into guest.
+ This mode requires kvm-amd.avic=1.
+ (Default when IOMMU HW support is present.)
amijoy.map= [HW,JOY] Amiga joystick support
Map of devices attached to JOY0DAT and JOY1DAT
Format: <a>,<b>