[PATCH 1/3] arm64: mte: fix restoration of GCR_EL1 from suspend

[Mark Rutland]

Since commit:

  bad1e1c663e0a72f ("arm64: mte: switch GCR_EL1 in kernel entry and exit")

... we' saved/restored the user GCR_EL1 value at exception boundaries,
and update_gcr_el1_excl() is no longer used for this. However it is used
to restore the kernel's GCR_EL1 value when returning from a suspend
state. Thus, the comment is misleading (and an ISB is necessary).

When restoring the kernel's GCR value, we need an ISB to ensure this is
used by subsequent instructions. We don't necessarily get an ISB by
other means (e.g. if the kernel is built without support for pointer
authentication). As __cpu_setup() initialised GCR_EL1.Exclude to 0xffff,
until a context synchronization event, allocation tag 0 may be used
rather than the desired set of tags.

This patch drops the misleading comment, adds the missing ISB, and for
clarity folds update_gcr_el1_excl() into its only user.

Fixes: bad1e1c663e0a72f ("arm64: mte: switch GCR_EL1 in kernel entry and exit")
Signed-off-by: Mark Rutland <mark.rutland at arm.com>
Cc: Andrey Konovalov <andreyknvl at gmail.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Vincenzo Frascino <vincenzo.frascino at arm.com>
Cc: Will Deacon <will at kernel.org>
---
 arch/arm64/kernel/mte.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
index 69b3fde8759e..36f51b0e438a 100644
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c
@@ -193,18 +193,6 @@ void mte_check_tfsr_el1(void)
 }
 #endif
 
-static void update_gcr_el1_excl(u64 excl)
-{
-
-	/*
-	 * Note that the mask controlled by the user via prctl() is an
-	 * include while GCR_EL1 accepts an exclude mask.
-	 * No need for ISB since this only affects EL0 currently, implicit
-	 * with ERET.
-	 */
-	sysreg_clear_set_s(SYS_GCR_EL1, SYS_GCR_EL1_EXCL_MASK, excl);
-}
-
 static void set_gcr_el1_excl(u64 excl)
 {
 	current->thread.gcr_user_excl = excl;
@@ -265,7 +253,8 @@ void mte_suspend_exit(void)
 	if (!system_supports_mte())
 		return;
 
-	update_gcr_el1_excl(gcr_kernel_excl);
+	sysreg_clear_set_s(SYS_GCR_EL1, SYS_GCR_EL1_EXCL_MASK, gcr_kernel_excl);
+	isb();
 }
 
 long set_mte_ctrl(struct task_struct *task, unsigned long arg)
-- 
2.11.0