This is a note to let you know that I've just added the patch titled
arm64/signal: Always accept SVE signal frames on SME only systems
to the 6.1-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-signal-always-accept-sve-signal-frames-on-sme-only-systems.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7dde62f0687c8856b6c0660066c7ee83a6a6f033 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@xxxxxxxxxx>
Date: Tue, 27 Dec 2022 17:12:05 +0000
Subject: arm64/signal: Always accept SVE signal frames on SME only systems
From: Mark Brown <broonie@xxxxxxxxxx>
commit 7dde62f0687c8856b6c0660066c7ee83a6a6f033 upstream.
Currently we reject an attempt to restore a SVE signal frame on a system
with SME but not SVE supported. This means that it is not possible to
disable streaming mode via signal return as this is configured via the
flags in the SVE signal context. Instead accept the signal frame, we will
require it to have a vector length of 0 specified and no payload since the
task will have no SVE vector length configured.
Fixes: 85ed24dad290 ("arm64/sme: Implement streaming SVE signal handling")
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221223-arm64-fix-sme-only-v1-2-938d663f69e5@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/signal.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -280,7 +280,12 @@ static int restore_sve_fpsimd_context(st
vl = task_get_sme_vl(current);
} else {
- if (!system_supports_sve())
+ /*
+ * A SME only system use SVE for streaming mode so can
+ * have a SVE formatted context with a zero VL and no
+ * payload data.
+ */
+ if (!system_supports_sve() && !system_supports_sme())
return -EINVAL;
vl = task_get_sve_vl(current);
Patches currently in stable-queue which might be from broonie@xxxxxxxxxx are
queue-6.1/arm64-signal-always-accept-sve-signal-frames-on-sme-only-systems.patch
queue-6.1/arm64-signal-always-allocate-sve-signal-frames-on-sme-only-systems.patch
queue-6.1/arm64-ptrace-use-arm64_sme-to-guard-the-sme-register-enumerations.patch
queue-6.1/firmware-psci-don-t-register-with-debugfs-if-psci-isn-t-available.patch
queue-6.1/asoc-qcom-lpass-cpu-fix-fallback-sd-line-index-handling.patch
queue-6.1/asoc-rt9120-make-dev-pm-runtime-bind-asoc-component-pm.patch
