Define kconfig symbols which are used by arm64 cpufeatures to prevent
using undefined symbols and rely on IS_ENABLED returning false.
All the features related to those symbols are unsupported by Xen:
- pointer authentication
- sve
- memory tagging
- branch target identification

Signed-off-by: Bertrand Marquis <bertrand.marquis@arm.com>
---
Change in v2:
- patch introduced
---
 xen/arch/arm/Kconfig | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index ecfa6822e4..c9a4e40e9b 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -97,6 +97,34 @@ config HARDEN_BRANCH_PREDICTOR
 
 	  If unsure, say Y.
 
+config ARM64_PTR_AUTH
+	def_bool n
+	depends on ARM64
+	help
+	  Pointer authentication support.
+	  This feature is not supported in Xen.
+
+config ARM64_SVE
+	def_bool n
+	depends on ARM64
+	help
+	  Scalar Vector Extension support.
+	  This feature is not supported in Xen.
+
+config ARM64_MTE
+	def_bool n
+	depends on ARM64
+	help
+	  Memory Tagging Extension support.
+	  This feature is not supported in Xen.
+
+config ARM64_BTI
+	def_bool n
+	depends on ARM64
+	help
+	  Branch Target Identification support.
+	  This feature is not supported in Xen.
+
 config TEE
 	bool "Enable TEE mediators support (UNSUPPORTED)" if UNSUPPORTED
 	default n
-- 
2.25.1

Hi Bertrand,

On 31/05/2022 11:43, Bertrand Marquis wrote:
> Define kconfig symbols which are used by arm64 cpufeatures to prevent
> using undefined symbols and rely on IS_ENABLED returning false.
> All the features related to those symbols are unsupported by Xen:
> - pointer authentication
> - sve
> - memory tagging
> - branch target identification
> 
> Signed-off-by: Bertrand Marquis <bertrand.marquis@arm.com>

Acked-by: Julien Grall <jgrall@amazon.com>

Cheers,

-- 
Julien Grall