Will Deacon 7a89674c2e arm64: ssbs: Fix context-switch when SSBS is present on all CPUs ... commit fca3d33d8a upstream. When all CPUs in the system implement the SSBS extension, the SSBS field in PSTATE is the definitive indication of the mitigation state. Further, when the CPUs implement the SSBS manipulation instructions (advertised to userspace via an HWCAP), EL0 can toggle the SSBS field directly and so we cannot rely on any shadow state such as TIF_SSBD at all. Avoid forcing the SSBS field in context-switch on such a system, and simply rely on the PSTATE register instead. Cc: <stable@vger.kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Srinivas Ramana <sramana@codeaurora.org> Fixes: cbdf8a189a ("arm64: Force SSBS on context switch") Reviewed-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-02-19 19:51:56 +01:00
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boot	arm64: kbuild: remove compressed images on 'make ARCH=arm64 (dist)clean'	2020-02-05 14:43:35 +00:00
configs	arm64: defconfig: Re-enable bcm2835-thermal driver	2020-01-27 14:50:10 +01:00
crypto	crypto: arm64/sha2-ce - correct digest for empty data in finup	2019-07-26 09:14:19 +02:00
include	KVM: arm64: Only sign-extend MMIO up to register width	2020-02-11 04:33:58 -08:00
kernel	arm64: ssbs: Fix context-switch when SSBS is present on all CPUs	2020-02-19 19:51:56 +01:00
kvm	arm64: nofpsmid: Handle TIF_FOREIGN_FPSTATE flag cleanly	2020-02-19 19:51:54 +01:00
lib	arm64: lib: use C string functions with KASAN enabled	2019-12-01 09:17:01 +01:00
mm	arm64: Revert support for execute-only user mappings	2020-01-09 10:19:03 +01:00
net	bpf, arm64: use more scalable stadd over ldxr / stxr loop in xadd	2019-07-03 13:14:49 +02:00
xen	arm64: mm: Add additional parameter to uaccess_ttbr0_disable	2018-01-17 13:57:49 +01:00
Kconfig	arm64: enable generic CPU vulnerabilites support	2019-10-11 18:21:33 +02:00
Kconfig.debug	Kconfig: consolidate the "Kernel hacking" menu	2018-08-02 08:06:48 +09:00
Kconfig.platforms	ARM: SoC: late updates	2018-08-25 14:12:36 -07:00
Makefile	arm64: makefile fix build of .i file in external module case	2019-12-01 09:17:14 +01:00