KVM: arm64: Get rid of REG_HIDDEN_USER visibility qualifier

Now that REG_HIDDEN_USER has no direct user anymore, remove it
entirely and update all users of sysreg_hidden_user() to call
sysreg_hidden() instead.
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240904082419.1982402-4-maz@kernel.orgSigned-off-by: Marc Zyngier <maz@kernel.org>

arch/arm64/kvm/sys_regs.c

@@ -2084,17 +2084,6 @@ static bool bad_redir_trap(struct kvm_vcpu *vcpu,
 #define EL2_REG_VNCR(name, rst, v)	EL2_REG(name, bad_vncr_trap, rst, v)
 #define EL2_REG_REDIR(name, rst, v)	EL2_REG(name, bad_redir_trap, rst, v)
 
-/*
- * EL{0,1}2 registers are the EL2 view on an EL0 or EL1 register when
- * HCR_EL2.E2H==1, and only in the sysreg table for convenience of
- * handling traps. Given that, they are always hidden from userspace.
- */
-static unsigned int hidden_user_visibility(const struct kvm_vcpu *vcpu,
-					   const struct sys_reg_desc *rd)
-{
-	return REG_HIDDEN_USER;
-}
-
 /*
  * Since reset() callback and field val are not used for idregs, they will be
  * used for specific purposes for idregs.
@@ -4273,7 +4262,7 @@ int kvm_sys_reg_get_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
 	int ret;
 
 	r = id_to_sys_reg_desc(vcpu, reg->id, table, num);
-	if (!r || sysreg_hidden_user(vcpu, r))
+	if (!r || sysreg_hidden(vcpu, r))
 		return -ENOENT;
 
 	if (r->get_user) {
@@ -4317,7 +4306,7 @@ int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
 		return -EFAULT;
 
 	r = id_to_sys_reg_desc(vcpu, reg->id, table, num);
-	if (!r || sysreg_hidden_user(vcpu, r))
+	if (!r || sysreg_hidden(vcpu, r))
 		return -ENOENT;
 
 	if (sysreg_user_write_ignore(vcpu, r))
@@ -4403,7 +4392,7 @@ static int walk_one_sys_reg(const struct kvm_vcpu *vcpu,
 	if (!(rd->reg || rd->get_user))
 		return 0;
 
-	if (sysreg_hidden_user(vcpu, rd))
+	if (sysreg_hidden(vcpu, rd))
 		return 0;
 
 	if (!copy_reg_to_user(rd, uind))

arch/arm64/kvm/sys_regs.h

@@ -95,9 +95,8 @@ struct sys_reg_desc {
 };
 
 #define REG_HIDDEN		(1 << 0) /* hidden from userspace and guest */
-#define REG_HIDDEN_USER		(1 << 1) /* hidden from userspace only */
-#define REG_RAZ			(1 << 2) /* RAZ from userspace and guest */
-#define REG_USER_WI		(1 << 3) /* WI from userspace only */
+#define REG_RAZ			(1 << 1) /* RAZ from userspace and guest */
+#define REG_USER_WI		(1 << 2) /* WI from userspace only */
 
 static __printf(2, 3)
 inline void print_sys_reg_msg(const struct sys_reg_params *p,
@@ -165,15 +164,6 @@ static inline bool sysreg_hidden(const struct kvm_vcpu *vcpu,
 	return sysreg_visibility(vcpu, r) & REG_HIDDEN;
 }
 
-static inline bool sysreg_hidden_user(const struct kvm_vcpu *vcpu,
-				      const struct sys_reg_desc *r)
-{
-	if (likely(!r->visibility))
-		return false;
-
-	return r->visibility(vcpu, r) & (REG_HIDDEN | REG_HIDDEN_USER);
-}
-
 static inline bool sysreg_visible_as_raz(const struct kvm_vcpu *vcpu,
 					 const struct sys_reg_desc *r)
 {