diff options
| author | James Morse <james.morse@arm.com> | 2020-04-24 17:38:44 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-29 16:31:09 +0200 |
| commit | 05a5ec4131b747b57c268cb72c6810ef6a8e653f (patch) | |
| tree | 7eec5c8d657afa384d72f07ac909d5261bd227da | |
| parent | 0cfa7fbc564e1d4fe3fadf0179ab99b3bf0b32bb (diff) | |
| download | linux-stable-05a5ec4131b747b57c268cb72c6810ef6a8e653f.tar.gz linux-stable-05a5ec4131b747b57c268cb72c6810ef6a8e653f.tar.bz2 linux-stable-05a5ec4131b747b57c268cb72c6810ef6a8e653f.zip | |
arm64: compat: Workaround Neoverse-N1 #1542419 for compat user-space
[ Upstream commit: 222fc0c8503d98cec3cb2bac2780cdd21a6e31c0 ]
Compat user-space is unable to perform ICIMVAU instructions from
user-space. Instead it uses a compat-syscall. Add the workaround for
Neoverse-N1 #1542419 to this code path.
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | arch/arm64/kernel/sys_compat.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c index 010212d35700..5a9b220aef6c 100644 --- a/arch/arm64/kernel/sys_compat.c +++ b/arch/arm64/kernel/sys_compat.c @@ -19,6 +19,7 @@ */ #include <linux/compat.h> +#include <linux/cpufeature.h> #include <linux/personality.h> #include <linux/sched.h> #include <linux/sched/signal.h> @@ -28,6 +29,7 @@ #include <asm/cacheflush.h> #include <asm/system_misc.h> +#include <asm/tlbflush.h> #include <asm/unistd.h> static long @@ -41,6 +43,15 @@ __do_compat_cache_op(unsigned long start, unsigned long end) if (fatal_signal_pending(current)) return 0; + if (cpus_have_const_cap(ARM64_WORKAROUND_1542419)) { + /* + * The workaround requires an inner-shareable tlbi. + * We pick the reserved-ASID to minimise the impact. + */ + __tlbi(aside1is, 0); + dsb(ish); + } + ret = __flush_cache_user_range(start, start + chunk); if (ret) return ret; |