lwn.git - Linux kernel documentation tree maintained by Jonathan Corbet

Age	Commit message (Collapse)	Author
2021-10-04	treewide: Replace the use of mem_encrypt_active() with cc_platform_has()	Tom Lendacky
	Replace uses of mem_encrypt_active() with calls to cc_platform_has() with the CC_ATTR_MEM_ENCRYPT attribute. Remove the implementation of mem_encrypt_active() across all arches. For s390, since the default implementation of the cc_platform_has() matches the s390 implementation of mem_encrypt_active(), cc_platform_has() does not need to be implemented in s390 (the config option ARCH_HAS_CC_PLATFORM is not set). Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210928191009.32551-9-bp@alien8.de
2019-08-30	powerpc/pseries/svm: Force SWIOTLB for secure guests	Anshuman Khandual
	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