iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

arm64/fpsimd: Sync and zero pad FPSIMD state for streaming SVE

Browse Source 
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@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230803-arm64-fix-ptrace-ssve-no-sve-v1-3-49df214bfb3e@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mark Brown 2023-08-03 19:33:23 +01:00 committed by Greg Kroah-Hartman
parent b8ea2a4691
commit bae353469a
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm64/kernel/fpsimd.c
View File

@ -791,7 +791,8 @@ void sve_sync_from_fpsimd_zeropad(struct task_struct *task)
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));