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arm64: compat: Workaround Neoverse-N1 #1542419 for compat user-space

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[ 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>
This commit is contained in:
James Morse 2020-04-24 17:38:04 +01:00 • committed by Greg Kroah-Hartman
commit aa50d567ec
1 changed files with 11 additions and 0 deletions
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11
arch/arm64/kernel/sys_compat.c
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@ -8,6 +8,7 @@
*/
#include <linux/compat.h>
#include <linux/cpufeature.h>
#include <linux/personality.h>
#include <linux/sched.h>
#include <linux/sched/signal.h>
@ -17,6 +18,7 @@
#include <asm/cacheflush.h>
#include <asm/system_misc.h>
#include <asm/tlbflush.h>
#include <asm/unistd.h>
static long
@ -30,6 +32,15 @@ __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;