hw/mips: Implement the kvm_type() hook in MachineClass

MIPS has two types of KVM: TE & VZ, and TE is the default type. Now we
can't create a VZ guest in QEMU because it lacks the kvm_type() hook in
MachineClass. This patch add the the kvm_type() hook to support both of
the two types.

[AM: Added "if defined" guards.]

Reviewed-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
Signed-off-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Co-developed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Message-Id: <1592995531-32600-2-git-send-email-chenhc@lemote.com>
diff --git a/target/mips/kvm_mips.h b/target/mips/kvm_mips.h
index 1e40147..171d53d 100644
--- a/target/mips/kvm_mips.h
+++ b/target/mips/kvm_mips.h
@@ -12,6 +12,8 @@
 #ifndef KVM_MIPS_H
 #define KVM_MIPS_H
 
+#include "cpu.h"
+
 /**
  * kvm_mips_reset_vcpu:
  * @cpu: MIPSCPU
@@ -23,4 +25,13 @@
 int kvm_mips_set_interrupt(MIPSCPU *cpu, int irq, int level);
 int kvm_mips_set_ipi_interrupt(MIPSCPU *cpu, int irq, int level);
 
+#ifdef CONFIG_KVM
+int mips_kvm_type(MachineState *machine, const char *vm_type);
+#else
+static inline int mips_kvm_type(MachineState *machine, const char *vm_type)
+{
+    return 0;
+}
+#endif
+
 #endif /* KVM_MIPS_H */