[PATCH v1 05/26] KVM: arm64: Generalize kvm_has_feat_*

[Steffen Eiden]

Introduce an intermediate macro that extracts the value from a passed
parameter instead of reading the VM's ID register. Allow using other
sources of ID register values, i.e. read directly from the hardware or
during a sequence of sanitization steps.

Co-developed-by: Nina Schoetterl-Glausch <nsg at linux.ibm.com>
Signed-off-by: Nina Schoetterl-Glausch <nsg at linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden at linux.ibm.com>
---
 arch/arm64/include/asm/kvm_feature.h | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_feature.h b/arch/arm64/include/asm/kvm_feature.h
index 6dd7b4a4929c..b627696ac648 100644
--- a/arch/arm64/include/asm/kvm_feature.h
+++ b/arch/arm64/include/asm/kvm_feature.h
@@ -26,6 +26,16 @@
 	 cmp_id_feat_signed(val, id, fld, op, limit) :			\
 	 cmp_id_feat_unsigned(val, id, fld, op, limit))
 
+#define id_has_feat(val, id, fld, limit)				\
+	cmp_id_feat(val, id, fld, >=, limit)
+
+#define id_has_feat_enum(val, id, fld, variant)				\
+	cmp_id_feat_unsigned(val, id, fld, ==, variant)
+
+#define id_has_feat_range(val, id, fld, min, max)			\
+	(cmp_id_feat(val, id, fld, >=, min) &&				\
+	cmp_id_feat(val, id, fld, <=, max))
+
 #define get_idreg_field_unsigned(kvm, id, fld)				\
 	extract_id_field_unsigned(kvm_read_vm_id_reg((kvm), SYS_##id), id, fld)
 
@@ -45,18 +55,17 @@
 	cmp_id_feat(kvm_read_vm_id_reg((kvm), SYS_##id), id, fld, op, limit)
 
 #define __kvm_has_feat(kvm, id, fld, limit)				\
-	kvm_cmp_feat(kvm, id, fld, >=, limit)
+	id_has_feat(kvm_read_vm_id_reg((kvm), SYS_##id), id, fld, limit)
 
 #define kvm_has_feat(kvm, ...) __kvm_has_feat(kvm, __VA_ARGS__)
 
 #define __kvm_has_feat_enum(kvm, id, fld, val)				\
-	kvm_cmp_feat_unsigned(kvm, id, fld, ==, val)
+	id_has_feat_enum(kvm_read_vm_id_reg((kvm), SYS_##id), id, fld, val)
 
 #define kvm_has_feat_enum(kvm, ...) __kvm_has_feat_enum(kvm, __VA_ARGS__)
 
 #define kvm_has_feat_range(kvm, id, fld, min, max)			\
-	(kvm_cmp_feat(kvm, id, fld, >=, min) &&				\
-	kvm_cmp_feat(kvm, id, fld, <=, max))
+	id_has_feat_range(kvm_read_vm_id_reg((kvm), SYS_##id), id, fld, min, max)
 
 /* Check for a given level of PAuth support */
 #define kvm_has_pauth(k, l)						\
-- 
2.53.0