arm64: compat: Workaround Neoverse-N1 #1542419 for compat user-space (222fc0c8) · Commits · 戴 / test

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>

arch/arm64/kernel/sys_compat.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -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;

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