Commit 6b9f142f authored by Mark Brown's avatar Mark Brown Committed by yanhaitao
Browse files

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

mainline inclusion
from mainline-v6.5-rc5
commit 507ea5dd
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8E73O
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=507ea5dd92d23fcf10e4d1a68a443c86a49753ed



-------------------------------------------------

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: e12310a0 ("arm64/sme: Implement ptrace support for streaming mode SVE registers")
Signed-off-by: default avatarMark 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: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarWang ShaoBo <bobo.shaobowang@huawei.com>
parent 13636080

arch/arm64/kernel/fpsimd.c

+2 −2
Original line number Diff line number Diff line
@@ -628,7 +628,7 @@ 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));
@@ -654,7 +654,7 @@ 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);