LoongArch: KVM: add virt extioi cpu encode support

Upstream: no

The extioi controller can send interrupts to only
four cpus and cannot send interrupts to other cpus.
This patch enables extioi to send interrupts to
a maximum of 256 cpus.

Signed-off-by: Xianglai Li <lixianglai@loongson.cn>

arch/loongarch/include/asm/kvm_extioi.h

@@ -34,6 +34,23 @@
 #define EXTIOI_COREMAP_START		0x800
 #define EXTIOI_COREMAP_END		0x8ff
 
+#define EIOINTC_VIRT_BASE		(0x40000000)
+#define EIOINTC_VIRT_SIZE		(0x1000)
+
+#define EIOINTC_VIRT_FEATURES		(0x0)
+#define EIOINTC_HAS_VIRT_EXTENSION	(0)
+#define EIOINTC_HAS_ENABLE_OPTION	(1)
+#define EIOINTC_HAS_INT_ENCODE		(2)
+#define EIOINTC_HAS_CPU_ENCODE		(3)
+#define EIOINTC_VIRT_HAS_FEATURES	((1U << EIOINTC_HAS_VIRT_EXTENSION) \
+					| (1U << EIOINTC_HAS_ENABLE_OPTION) \
+					| (1U << EIOINTC_HAS_INT_ENCODE)    \
+					| (1U << EIOINTC_HAS_CPU_ENCODE))
+#define EIOINTC_VIRT_CONFIG		(0x4)
+#define EIOINTC_ENABLE			(1)
+#define EIOINTC_ENABLE_INT_ENCODE	(2)
+#define EIOINTC_ENABLE_CPU_ENCODE	(3)
+
 #define LS3A_INTC_IP			8
 
 #define EXTIOI_SW_COREMAP_FLAG		(1 << 0)
@@ -42,6 +59,11 @@ struct loongarch_extioi {
 	spinlock_t lock;
 	struct kvm *kvm;
 	struct kvm_io_device device;
+	struct kvm_io_device device_vext;
+	uint32_t num_cpu;
+	uint32_t features;
+	uint32_t status;
+
 	/* hardware state */
 	union nodetype {
 		u64 reg_u64[EXTIOI_IRQS_NODETYPE_COUNT / 4];

arch/loongarch/include/uapi/asm/kvm.h

@@ -142,6 +142,17 @@ struct kvm_iocsr_entry {
 
 #define KVM_DEV_LOONGARCH_EXTIOI_GRP_REGS	0x40000003
 
+#define KVM_DEV_LOONGARCH_EXTIOI_GRP_SW_STATUS		0x40000006
+#define KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_NUM_CPU	0x0
+#define KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_FEATURE	0x1
+#define KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_STATE	0x2
+
+#define KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL		0x40000007
+#define KVM_DEV_LOONGARCH_EXTIOI_CTRL_INIT_NUM_CPU	0x0
+#define KVM_DEV_LOONGARCH_EXTIOI_CTRL_INIT_FEATURE	0x1
+#define KVM_DEV_LOONGARCH_EXTIOI_CTRL_LOAD_FINISHED	0x3
+
+
 #define KVM_DEV_LOONGARCH_PCH_PIC_GRP_CTRL	0x40000004
 #define KVM_DEV_LOONGARCH_PCH_PIC_CTRL_INIT	0