diff options
| author | Anshuman Khandual <khandual@linux.vnet.ibm.com> | 2019-08-19 23:13:24 -0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 09:55:41 +1000 |
| commit | 2efbc58f157a39ad9e9199b92d9c47736023a2fe (patch) | |
| tree | 05345d5a02d206351c5127415d4f334e6eb4a59e /arch/powerpc/platforms/pseries/Kconfig | |
| parent | edea902c1c1efb855f77e041f9daf1abe7a9768a (diff) | |
powerpc/pseries/svm: Force SWIOTLB for secure guests
SWIOTLB checks range of incoming CPU addresses to be bounced and sees if
the device can access it through its DMA window without requiring bouncing.
In such cases it just chooses to skip bouncing. But for cases like secure
guests on powerpc platform all addresses need to be bounced into the shared
pool of memory because the host cannot access it otherwise. Hence the need
to do the bouncing is not related to device's DMA window and use of bounce
buffers is forced by setting swiotlb_force.
Also, connect the shared memory conversion functions into the
ARCH_HAS_MEM_ENCRYPT hooks and call swiotlb_update_mem_attributes() to
convert SWIOTLB's memory pool to shared memory.
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
[ bauerman: Use ARCH_HAS_MEM_ENCRYPT hooks to share swiotlb memory pool. ]
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820021326.6884-15-bauerman@linux.ibm.com
Diffstat (limited to 'arch/powerpc/platforms/pseries/Kconfig')
| -rw-r--r-- | arch/powerpc/platforms/pseries/Kconfig | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig index d09deb05bb66..9e35cddddf73 100644 --- a/arch/powerpc/platforms/pseries/Kconfig +++ b/arch/powerpc/platforms/pseries/Kconfig @@ -149,6 +149,9 @@ config PAPR_SCM config PPC_SVM bool "Secure virtual machine (SVM) support for POWER" depends on PPC_PSERIES + select SWIOTLB + select ARCH_HAS_MEM_ENCRYPT + select ARCH_HAS_FORCE_DMA_UNENCRYPTED help There are certain POWER platforms which support secure guests using the Protected Execution Facility, with the help of an Ultravisor |