mips/kvm: Use ARRAY_SIZE() instead of hardcoded constants in kvm_arch_vcpu_ioctl_{s,g}et_regs

Also we cannot set special zero register, so force it to zero.

Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Sanjay Lal <sanjayl@kymasys.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/mips/kvm/kvm_mips.c b/arch/mips/kvm/kvm_mips.c
index 93da750..71a1fc1 100644
--- a/arch/mips/kvm/kvm_mips.c
+++ b/arch/mips/kvm/kvm_mips.c
@@ -677,9 +677,9 @@
 {
 	int i;
 
-	for (i = 0; i < 32; i++)
+	for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
 		vcpu->arch.gprs[i] = regs->gpr[i];
-
+	vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
 	vcpu->arch.hi = regs->hi;
 	vcpu->arch.lo = regs->lo;
 	vcpu->arch.pc = regs->pc;
@@ -691,7 +691,7 @@
 {
 	int i;
 
-	for (i = 0; i < 32; i++)
+	for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
 		regs->gpr[i] = vcpu->arch.gprs[i];
 
 	regs->hi = vcpu->arch.hi;