KVM: arm64: Get rid of FIXED_VALUE altogether

We have now killed every occurrences of FIXED_VALUE, and we can therefore
drop the whole infrastructure. Good riddance.

Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-16-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

Author: Marc Zyngier

arch/arm64/kvm/config.c

@@ -22,13 +22,12 @@ struct reg_bits_to_feat_map {
 
 #define	NEVER_FGU	BIT(0)	/* Can trap, but never UNDEF */
 #define	CALL_FUNC	BIT(1)	/* Needs to evaluate tons of crap */
-#define	FIXED_VALUE	BIT(2)	/* RAZ/WI or RAO/WI in KVM */
+#define	FORCE_RESx	BIT(2)	/* Unconditional RESx */
 #define	MASKS_POINTER	BIT(3)	/* Pointer to fgt_masks struct instead of bits */
 #define	AS_RES1		BIT(4)	/* RES1 when not supported */
 #define	REQUIRES_E2H1	BIT(5)	/* Add HCR_EL2.E2H RES1 as a pre-condition */
 #define	RES1_WHEN_E2H0	BIT(6)	/* RES1 when E2H=0 and not supported */
 #define	RES1_WHEN_E2H1	BIT(7)	/* RES1 when E2H=1 and not supported */
-#define	FORCE_RESx	BIT(8)	/* Unconditional RESx */
 
 	unsigned long	flags;
 
@@ -41,7 +40,6 @@ struct reg_bits_to_feat_map {
 			s8	lo_lim;
 		};
 		bool	(*match)(struct kvm *);
-		bool	(*fval)(struct kvm *, struct resx *);
 	};
 };
 
@@ -74,13 +72,6 @@ struct reg_feat_map_desc {
 		.lo_lim	= id ##_## fld ##_## lim	\
 	}
 
-#define __NEEDS_FEAT_2(m, f, w, fun, dummy)		\
-	{						\
-		.w	= (m),				\
-		.flags = (f) | CALL_FUNC,		\
-		.fval = (fun),				\
-	}
-
 #define __NEEDS_FEAT_1(m, f, w, fun)			\
 	{						\
 		.w	= (m),				\
@@ -100,9 +91,6 @@ struct reg_feat_map_desc {
 #define NEEDS_FEAT_FLAG(m, f, ...)			\
 	__NEEDS_FEAT_FLAG(m, f, bits, __VA_ARGS__)
 
-#define NEEDS_FEAT_FIXED(m, ...)			\
-	__NEEDS_FEAT_FLAG(m, FIXED_VALUE, bits, __VA_ARGS__, 0)
-
 #define NEEDS_FEAT_MASKS(p, ...)				\
 	__NEEDS_FEAT_FLAG(p, MASKS_POINTER, masks, __VA_ARGS__)
 
@@ -1303,19 +1291,12 @@ static struct resx compute_resx_bits(struct kvm *kvm,
 		if (map[i].flags & exclude)
 			continue;
 
-		switch (map[i].flags & (FORCE_RESx | CALL_FUNC | FIXED_VALUE)) {
-		case CALL_FUNC | FIXED_VALUE:
-			map[i].fval(kvm, &resx);
-			continue;
-		case CALL_FUNC:
-			match = map[i].match(kvm);
-			break;
-		case FORCE_RESx:
+		if (map[i].flags & FORCE_RESx)
 			match = false;
-			break;
-		default:
+		else if (map[i].flags & CALL_FUNC)
+			match = map[i].match(kvm);
+		else
 			match = idreg_feat_match(kvm, &map[i]);
-		}
 
 		if (map[i].flags & REQUIRES_E2H1)
 			match &= !e2h0;