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Subject[PATCH 1/2] iommu: Add config option to set passthrough as default
Date
This allows the default behavior to be controlled by a kernel config
option instead of changing the commandline for the kernel to include
"iommu.passthrough=on" on machines where this is desired.

Signed-off-by: Olof Johansson <olof@lixom.net>
---
drivers/iommu/Kconfig | 10 ++++++++++
drivers/iommu/iommu.c | 4 ++++
2 files changed, 14 insertions(+)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 689ffe538370..a9bb1a5b5e43 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -60,6 +60,16 @@ config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST

endmenu

+config IOMMU_DEFAULT_PASSTHROUGH
+ bool "IOMMU passthrough by default"
+ depends on IOMMU_API
+ help
+ Enable passthrough by default (removing the need to pass in
+ iommu.passthrough=on through command line). If this is enabled,
+ you can still disable with iommu.passthrough=off
+
+ If unsure, say N here.
+
config IOMMU_IOVA
tristate

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 63b37563db7e..ab8fc54467e0 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -36,7 +36,11 @@

static struct kset *iommu_group_kset;
static DEFINE_IDA(iommu_group_ida);
+#ifdef CONFIG_IOMMU_DEFAULT_PASSTHROUGH
+static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;
+#else
static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA;
+#endif

struct iommu_callback_data {
const struct iommu_ops *ops;
--
2.11.0
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