x86, AMD IOMMU: more verbose Kconfig description text
This patch replaces the short description text for AMD IOMMU in Kconfig with a
more verbose one.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: robert.richter@amd.com
Cc: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8aae462..b120cff 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -554,7 +554,15 @@
select SWIOTLB
depends on X86_64 && PCI && ACPI
help
- Select this to get support for AMD IOMMU hardware in your system.
+ With this option you can enable support for AMD IOMMU hardware in
+ your system. An IOMMU is a hardware component which provides
+ remapping of DMA memory accesses from devices. With an AMD IOMMU you
+ can isolate the the DMA memory of different devices and protect the
+ system from misbehaving device drivers or hardware.
+
+ You can find out if your system has an AMD IOMMU if you look into
+ your BIOS for an option to enable it or if you have an IVRS ACPI
+ table.
# need this always selected by IOMMU for the VIA workaround
config SWIOTLB