[PATCH for-5.1 V4 1/4] hw/mips: Implement the kvm_type() hook in MachineClass

[Huacai Chen <zltjiangshi@gmail.com>]

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. Besides, libvirt uses a null-machine to detect the kvm
capability, so by default it will return "KVM not supported" on a VZ
platform. Thus, null-machine also need the kvm_type() hook.

Reviewed-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>
---
 hw/core/Makefile.objs  |  2 +-
 hw/core/null-machine.c |  4 ++++
 hw/mips/Makefile.objs  |  2 +-
 hw/mips/common.c       | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/hw/mips/mips.h |  3 +++
 5 files changed, 51 insertions(+), 2 deletions(-)
 create mode 100644 hw/mips/common.c

diff --git a/hw/core/Makefile.objs b/hw/core/Makefile.objs
index 1d540ed..b5672f4 100644
--- a/hw/core/Makefile.objs
+++ b/hw/core/Makefile.objs
@@ -17,11 +17,11 @@ common-obj-$(CONFIG_SOFTMMU) += vm-change-state-handler.o
 common-obj-$(CONFIG_SOFTMMU) += qdev-properties-system.o
 common-obj-$(CONFIG_SOFTMMU) += sysbus.o
 common-obj-$(CONFIG_SOFTMMU) += machine.o
-common-obj-$(CONFIG_SOFTMMU) += null-machine.o
 common-obj-$(CONFIG_SOFTMMU) += loader.o
 common-obj-$(CONFIG_SOFTMMU) += machine-hmp-cmds.o
 common-obj-$(CONFIG_SOFTMMU) += numa.o
 common-obj-$(CONFIG_SOFTMMU) += clock-vmstate.o
+obj-$(CONFIG_SOFTMMU) += null-machine.o
 obj-$(CONFIG_SOFTMMU) += machine-qmp-cmds.o
 
 common-obj-$(CONFIG_EMPTY_SLOT) += empty_slot.o
diff --git a/hw/core/null-machine.c b/hw/core/null-machine.c
index cb47d9d..94a36f9 100644
--- a/hw/core/null-machine.c
+++ b/hw/core/null-machine.c
@@ -17,6 +17,7 @@
 #include "sysemu/sysemu.h"
 #include "exec/address-spaces.h"
 #include "hw/core/cpu.h"
+#include "hw/mips/mips.h"
 
 static void machine_none_init(MachineState *mch)
 {
@@ -50,6 +51,9 @@ static void machine_none_machine_init(MachineClass *mc)
     mc->max_cpus = 1;
     mc->default_ram_size = 0;
     mc->default_ram_id = "ram";
+#ifdef TARGET_MIPS
+    mc->kvm_type = mips_kvm_type;
+#endif
 }
 
 DEFINE_MACHINE("none", machine_none_machine_init)
diff --git a/hw/mips/Makefile.objs b/hw/mips/Makefile.objs
index 739e2b7..3b3e6ea 100644
--- a/hw/mips/Makefile.objs
+++ b/hw/mips/Makefile.objs
@@ -1,4 +1,4 @@
-obj-y += addr.o mips_int.o
+obj-y += addr.o common.o mips_int.o
 obj-$(CONFIG_R4K) += r4k.o
 obj-$(CONFIG_MALTA) += gt64xxx_pci.o malta.o
 obj-$(CONFIG_MIPSSIM) += mipssim.o
diff --git a/hw/mips/common.c b/hw/mips/common.c
new file mode 100644
index 0000000..4d8e141
--- /dev/null
+++ b/hw/mips/common.c
@@ -0,0 +1,42 @@
+/*
+ * Common MIPS routines
+ *
+ * Copyright (c) 2020 Huacai Chen (chenhc@lemote.com)
+ * This code is licensed under the GNU GPL v2.
+ */
+
+#include <linux/kvm.h>
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "hw/boards.h"
+#include "hw/mips/mips.h"
+#include "sysemu/kvm_int.h"
+
+#ifndef CONFIG_KVM
+
+int mips_kvm_type(MachineState *machine, const char *vm_type)
+{
+    return 0;
+}
+
+#else
+
+int mips_kvm_type(MachineState *machine, const char *vm_type)
+{
+    int r;
+    KVMState *s = KVM_STATE(machine->accelerator);
+
+    r = kvm_check_extension(s, KVM_CAP_MIPS_VZ);
+    if (r > 0) {
+        return KVM_VM_MIPS_VZ;
+    }
+
+    r = kvm_check_extension(s, KVM_CAP_MIPS_TE);
+    if (r > 0) {
+        return KVM_VM_MIPS_TE;
+    }
+
+    return -1;
+}
+
+#endif
diff --git a/include/hw/mips/mips.h b/include/hw/mips/mips.h
index 0af4c3d..2ac0580 100644
--- a/include/hw/mips/mips.h
+++ b/include/hw/mips/mips.h
@@ -20,4 +20,7 @@ void rc4030_dma_write(void *dma, uint8_t *buf, int len);
 
 DeviceState *rc4030_init(rc4030_dma **dmas, IOMMUMemoryRegion **dma_mr);
 
+/* common.c */
+int mips_kvm_type(MachineState *machine, const char *vm_type);
+
 #endif
-- 
2.7.0