arm64/fpsimd: Sync FPSIMD state with SVE for SME only systems

commit 507ea5dd92d23fcf10e4d1a68a443c86a49753ed upstream.

Currently we guard FPSIMD/SVE state conversions with a check for the system
supporting SVE but SME only systems may need to sync streaming mode SVE
state so add a check for SME support too.  These functions are only used
by the ptrace code.

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-v1-2-49df214bfb3e@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index f7dbc00..356036b 100644 (file)
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -634,7 +634,7 @@ static void fpsimd_to_sve(struct task_struct *task)
        void *sst = task->thread.sve_state;
        struct user_fpsimd_state const *fst = &task->thread.uw.fpsimd_state;
 
-       if (!system_supports_sve())
+       if (!system_supports_sve() && !system_supports_sme())
                return;
 
        vq = sve_vq_from_vl(thread_get_cur_vl(&task->thread));
@@ -660,7 +660,7 @@ static void sve_to_fpsimd(struct task_struct *task)
        unsigned int i;
        __uint128_t const *p;
 
-       if (!system_supports_sve())
+       if (!system_supports_sve() && !system_supports_sme())
                return;
 
        vl = thread_get_cur_vl(&task->thread);