[PATCH v6 28/37] arm64/sme: Provide Kconfig for SME

[Mark Brown <broonie@kernel.org>]

Now that basline support for the Scalable Matrix Extension (SME) is present
introduce the Kconfig option allowing it to be built. While there is no
requirement for a system with SME to support SVE at runtime the support for
streaming mode SVE is mostly shared with normal SVE so depend on SVE.

Since there is currently no support for KVM and no handling of either
streaming mode or ZA with KVM the option the feature is marked as being
incompatible with KVM and not enabled by default.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 arch/arm64/Kconfig | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c4207cf9bb17..486f614638d5 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1845,6 +1845,17 @@ config ARM64_SVE
 	  booting the kernel.  If unsure and you are not observing these
 	  symptoms, you should assume that it is safe to say Y.
 
+config ARM64_SME
+	bool "ARM Scalable Matrix Extension support"
+	depends on ARM64_SVE
+	depends on !KVM
+	help
+	  The Scalable Matrix Extension (SME) is an extension to the AArch64
+	  execution state which utilises a substantial subset of the SVE
+	  instruction set, together with the addition of new architectural
+	  register state capable of holding two dimensional matrix tiles to
+	  enable various matrix operations.
+
 config ARM64_MODULE_PLTS
 	bool "Use PLTs to allow module memory to spill over into vmalloc area"
 	depends on MODULES
-- 
2.30.2