From: Mark Brown Date: Tue, 27 Dec 2022 17:12:05 +0000 (+0000) Subject: arm64/signal: Always accept SVE signal frames on SME only systems X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7dde62f0687c8856b6c0660066c7ee83a6a6f033;p=linux.git arm64/signal: Always accept SVE signal frames on SME only systems 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 Link: https://lore.kernel.org/r/20221223-arm64-fix-sme-only-v1-2-938d663f69e5@kernel.org Signed-off-by: Will Deacon --- diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index e0d09bf5b01b8..f90ee2dc413cd 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -281,7 +281,12 @@ static int restore_sve_fpsimd_context(struct user_ctxs *user) 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);