This is a note to let you know that I've just added the patch titled
arm64/fpsimd: Sync and zero pad FPSIMD state for streaming SVE
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-fpsimd-sync-and-zero-pad-fpsimd-state-for-streaming-sve.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 69af56ae56a48a2522aad906c4461c6c7c092737 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@xxxxxxxxxx>
Date: Thu, 3 Aug 2023 19:33:23 +0100
Subject: arm64/fpsimd: Sync and zero pad FPSIMD state for streaming SVE
From: Mark Brown <broonie@xxxxxxxxxx>
commit 69af56ae56a48a2522aad906c4461c6c7c092737 upstream.
We have a function sve_sync_from_fpsimd_zeropad() which is used by the
ptrace code to update the SVE state when the user writes to the the
FPSIMD register set. Currently this checks that the task has SVE
enabled but this will miss updates for tasks which have streaming SVE
enabled if SVE has not been enabled for the thread, also do the
conversion if the task has streaming SVE enabled.
Fixes: e12310a0d30f ("arm64/sme: Implement ptrace support for streaming mode SVE registers")
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230803-arm64-fix-ptrace-ssve-no-sve-v1-3-49df214bfb3e@xxxxxxxxxx
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/fpsimd.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -835,7 +835,8 @@ void sve_sync_from_fpsimd_zeropad(struct
void *sst = task->thread.sve_state;
struct user_fpsimd_state const *fst = &task->thread.uw.fpsimd_state;
- if (!test_tsk_thread_flag(task, TIF_SVE))
+ if (!test_tsk_thread_flag(task, TIF_SVE) &&
+ !thread_sm_enabled(&task->thread))
return;
vq = sve_vq_from_vl(thread_get_cur_vl(&task->thread));
Patches currently in stable-queue which might be from broonie@xxxxxxxxxx are
queue-6.4/net-netsec-ignore-phy-mode-on-synquacer-in-dt-mode.patch
queue-6.4/arm64-ptrace-flush-fp-state-when-setting-zt0.patch
queue-6.4/arm64-fpsimd-sync-fpsimd-state-with-sve-for-sme-only-systems.patch
queue-6.4/arm64-fpsimd-clear-sme-state-in-the-target-task-when-setting-the-vl.patch
queue-6.4/arm64-ptrace-don-t-enable-sve-when-setting-streaming-sve.patch
queue-6.4/arm64-fpsimd-sync-and-zero-pad-fpsimd-state-for-streaming-sve.patch
