KVM: arm64: Return a bool from emulate_cp()

KVM indicates success/failure in several ways, but generally an integer
is used when conditionally bouncing to userspace is involved. That is
not the case from emulate_cp(); just use a bool instead.

No functional change intended.

Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220503060205.2823727-2-oupton@google.com

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 7b45c04..36895c1 100644 (file)
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2246,27 +2246,27 @@ static void perform_access(struct kvm_vcpu *vcpu,
  * @table: array of trap descriptors
  * @num: size of the trap descriptor array
  *
- * Return 0 if the access has been handled, and -1 if not.
+ * Return true if the access has been handled, false if not.
  */
-static int emulate_cp(struct kvm_vcpu *vcpu,
-                     struct sys_reg_params *params,
-                     const struct sys_reg_desc *table,
-                     size_t num)
+static bool emulate_cp(struct kvm_vcpu *vcpu,
+                      struct sys_reg_params *params,
+                      const struct sys_reg_desc *table,
+                      size_t num)
 {
        const struct sys_reg_desc *r;
 
        if (!table)
-               return -1;      /* Not handled */
+               return false;   /* Not handled */
 
        r = find_reg(params, table, num);
 
        if (r) {
                perform_access(vcpu, params, r);
-               return 0;
+               return true;
        }
 
        /* Not handled */
-       return -1;
+       return false;
 }
 
 static void unhandled_cp_access(struct kvm_vcpu *vcpu,
@@ -2330,7 +2330,7 @@ static int kvm_handle_cp_64(struct kvm_vcpu *vcpu,
         * potential register operation in the case of a read and return
         * with success.
         */
-       if (!emulate_cp(vcpu, &params, global, nr_global)) {
+       if (emulate_cp(vcpu, &params, global, nr_global)) {
                /* Split up the value between registers for the read side */
                if (!params.is_write) {
                        vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval));
@@ -2365,7 +2365,7 @@ static int kvm_handle_cp_32(struct kvm_vcpu *vcpu,
        params.Op1 = (esr >> 14) & 0x7;
        params.Op2 = (esr >> 17) & 0x7;
 
-       if (!emulate_cp(vcpu, &params, global, nr_global)) {
+       if (emulate_cp(vcpu, &params, global, nr_global)) {
                if (!params.is_write)
                        vcpu_set_reg(vcpu, Rt, params.regval);
                return 1;