From: Julien Thierry julien.thierry@arm.com
[ Upstream commit 9034f6251572a4744597c51dea5ab73a55f2b938 ]
For el0_dbg and el0_error, DAIF bits get explicitly cleared before calling ct_user_exit.
When context tracking is disabled, DAIF gets set (almost) immediately after. When context tracking is enabled, among the first things done is disabling IRQs.
What is actually needed is: - PSR.D = 0 so the system can be debugged (should be already the case) - PSR.A = 0 so async error can be handled during context tracking
Do not clear PSR.I in those two locations.
Reviewed-by: Marc Zyngier marc.zyngier@arm.com Acked-by: Mark Rutland mark.rutland@arm.com Reviewed-by: James Morse james.morse@arm.com Cc: Will Deacon will.deacon@arm.com Signed-off-by: Julien Thierry julien.thierry@arm.com Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/kernel/entry.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index c50a7a75f2e0..6a3890393963 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -855,7 +855,7 @@ el0_dbg: mov x1, x25 mov x2, sp bl do_debug_exception - enable_daif + enable_da_f ct_user_exit b ret_to_user el0_inv: @@ -907,7 +907,7 @@ el0_error_naked: enable_dbg mov x0, sp bl do_serror - enable_daif + enable_da_f ct_user_exit b ret_to_user ENDPROC(el0_error)