KVM: arm64: Check RAZ visibility in ID register accessors

[linux-2.6-microblaze.git] / arch / arm64 / kvm / sys_regs.h

diff --git a/arch/arm64/kvm/sys_regs.h b/arch/arm64/kvm/sys_regs.h
index 2641b2e..0f95964 100644 (file)
--- a/arch/arm64/kvm/sys_regs.h
+++ b/arch/arm64/kvm/sys_regs.h
@@ -60,6 +60,7 @@ struct sys_reg_desc {
 };
 
 #define REG_HIDDEN             (1 << 0) /* hidden from userspace and guest */
+#define REG_RAZ                        (1 << 1) /* RAZ from userspace and guest */
 
 static __printf(2, 3)
 inline void print_sys_reg_msg(const struct sys_reg_params *p,
@@ -119,6 +120,15 @@ static inline bool sysreg_hidden(const struct kvm_vcpu *vcpu,
        return r->visibility(vcpu, r) & REG_HIDDEN;
 }
 
+static inline bool sysreg_visible_as_raz(const struct kvm_vcpu *vcpu,
+                                        const struct sys_reg_desc *r)
+{
+       if (likely(!r->visibility))
+               return false;
+
+       return r->visibility(vcpu, r) & REG_RAZ;
+}
+
 static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
                              const struct sys_reg_desc *i2)
 {