Messages in this thread | | | From | "Yang, Shunyong" <> | Subject | Re: [PATCH 1/2] iommu: Add config option to set passthrough as default | Date | Thu, 12 Jul 2018 02:04:41 +0000 |
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Hi, Olof,
Tired of changing command line. I like this patch.
Thanks. Shunyong.
On Wed, 2018-07-11 at 13:59 -0700, Olof Johansson wrote: > 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;
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