kernel/tools/testing/selftests/powerpc/mm/prot_sao.c, branch linux-6.2.y

selftests/powerpc: Skip PROT_SAO test in guests/LPARS

2020-09-01T12:47:02Z

In commit 9b725a90a8f1 ("powerpc/64s: Disallow PROT_SAO in LPARs by default") PROT_SAO was disabled in guests/LPARs by default. So skip the test if we are running in a guest to avoid a spurious failure. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200901124653.523182-1-mpe@ellerman.id.au

selftests/powerpc: Update PROT_SAO test to skip ISA 3.1

2020-08-24T04:12:54Z

Since SAO support was removed from ISA 3.1, skip the prot_sao test if PPC_FEATURE2_ARCH_3_1 is set. Signed-off-by: Shawn Anastasio Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200821185558.35561-4-shawn@anastas.io

Revert "powerpc/64s: Remove PROT_SAO support"

2020-08-24T04:12:53Z

This reverts commit 5c9fa16e8abd342ce04dc830c1ebb2a03abf6c05. Since PROT_SAO can still be useful for certain classes of software, reintroduce it. Concerns about guest migration for LPARs using SAO will be addressed next. Signed-off-by: Shawn Anastasio Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200821185558.35561-2-shawn@anastas.io

powerpc/64s: Remove PROT_SAO support

2020-07-21T14:01:25Z

ISA v3.1 does not support the SAO storage control attribute required to implement PROT_SAO. PROT_SAO was used by specialised system software (Lx86) that has been discontinued for about 7 years, and is not thought to be used elsewhere, so removal should not cause problems. We rather remove it than keep support for older processors, because live migrating guest partitions to newer processors may not be possible if SAO is in use (or worse allowed with silent races). - PROT_SAO stays in the uapi header so code using it would still build. - arch_validate_prot() is removed, the generic version rejects PROT_SAO so applications would get a failure at mmap() time. Signed-off-by: Nicholas Piggin [mpe: Drop KVM change for the time being] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200703011958.1166620-3-npiggin@gmail.com

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 191

2019-05-30T18:29:21Z

Based on 1 normalized pattern(s): licensed under gplv2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 99 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Alexios Zavras Reviewed-by: Richard Fontana Reviewed-by: Allison Randal Reviewed-by: Steve Winslow Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528170027.163048684@linutronix.de Signed-off-by: Greg Kroah-Hartman

selftests/powerpc: Add a test for PROT_SAO

2016-07-14T10:26:25Z

PROT_SAO is a powerpc-specific flag to mmap(), and we rely on arch specific logic to allow it to be passed to mmap(). Add a small test to ensure mmap() accepts PROT_SAO. We don't have a good way to test that it actually causes the mapping to be created with the right flags, so for now we just touch the mapping so it's faulted in. In future we might be able to do something better. Signed-off-by: Michael Ellerman