LoongArch: KVM: Add stat information with kernel irqchip

Move stat information about kernel irqchip from VM to vCPU, since all
vm exiting events should be vCPU relative. And also add entry with
structure kvm_vcpu_stats_desc[], so that it can display with directory
/sys/kernel/debug/kvm.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

arch/loongarch/include/asm/kvm_host.h

@@ -50,12 +50,6 @@ struct kvm_vm_stat {
 	struct kvm_vm_stat_generic generic;
 	u64 pages;
 	u64 hugepages;
-	u64 ipi_read_exits;
-	u64 ipi_write_exits;
-	u64 eiointc_read_exits;
-	u64 eiointc_write_exits;
-	u64 pch_pic_read_exits;
-	u64 pch_pic_write_exits;
 };
 
 struct kvm_vcpu_stat {
@@ -65,6 +59,12 @@ struct kvm_vcpu_stat {
 	u64 cpucfg_exits;
 	u64 signal_exits;
 	u64 hypercall_exits;
+	u64 ipi_read_exits;
+	u64 ipi_write_exits;
+	u64 eiointc_read_exits;
+	u64 eiointc_write_exits;
+	u64 pch_pic_read_exits;
+	u64 pch_pic_write_exits;
 };
 
 #define KVM_MEM_HUGEPAGE_CAPABLE	(1UL << 0)

arch/loongarch/kvm/intc/eiointc.c

@@ -173,7 +173,7 @@ static int kvm_eiointc_read(struct kvm_vcpu *vcpu,
 
 	offset = addr & 0x7;
 	addr -= offset;
-	vcpu->kvm->stat.eiointc_read_exits++;
+	vcpu->stat.eiointc_read_exits++;
 	spin_lock_irqsave(&eiointc->lock, flags);
 	ret = loongarch_eiointc_read(vcpu, eiointc, addr, &data);
 	spin_unlock_irqrestore(&eiointc->lock, flags);
@@ -307,7 +307,7 @@ static int kvm_eiointc_write(struct kvm_vcpu *vcpu,
 		return -EINVAL;
 	}
 
-	vcpu->kvm->stat.eiointc_write_exits++;
+	vcpu->stat.eiointc_write_exits++;
 	spin_lock_irqsave(&eiointc->lock, flags);
 	switch (len) {
 	case 1:

arch/loongarch/kvm/intc/ipi.c

@@ -268,36 +268,16 @@ static int kvm_ipi_read(struct kvm_vcpu *vcpu,
 			struct kvm_io_device *dev,
 			gpa_t addr, int len, void *val)
 {
-	int ret;
-	struct loongarch_ipi *ipi;
-
-	ipi = vcpu->kvm->arch.ipi;
-	if (!ipi) {
-		kvm_err("%s: ipi irqchip not valid!\n", __func__);
-		return -EINVAL;
-	}
-	ipi->kvm->stat.ipi_read_exits++;
-	ret = loongarch_ipi_readl(vcpu, addr, len, val);
-
-	return ret;
+	vcpu->stat.ipi_read_exits++;
+	return loongarch_ipi_readl(vcpu, addr, len, val);
 }
 
 static int kvm_ipi_write(struct kvm_vcpu *vcpu,
 			struct kvm_io_device *dev,
 			gpa_t addr, int len, const void *val)
 {
-	int ret;
-	struct loongarch_ipi *ipi;
-
-	ipi = vcpu->kvm->arch.ipi;
-	if (!ipi) {
-		kvm_err("%s: ipi irqchip not valid!\n", __func__);
-		return -EINVAL;
-	}
-	ipi->kvm->stat.ipi_write_exits++;
-	ret = loongarch_ipi_writel(vcpu, addr, len, val);
-
-	return ret;
+	vcpu->stat.ipi_write_exits++;
+	return loongarch_ipi_writel(vcpu, addr, len, val);
 }
 
 static const struct kvm_io_device_ops kvm_ipi_ops = {

arch/loongarch/kvm/intc/pch_pic.c

@@ -196,7 +196,7 @@ static int kvm_pch_pic_read(struct kvm_vcpu *vcpu,
 	}
 
 	/* statistics of pch pic reading */
-	vcpu->kvm->stat.pch_pic_read_exits++;
+	vcpu->stat.pch_pic_read_exits++;
 	ret = loongarch_pch_pic_read(s, addr, len, val);
 
 	return ret;
@@ -303,7 +303,7 @@ static int kvm_pch_pic_write(struct kvm_vcpu *vcpu,
 	}
 
 	/* statistics of pch pic writing */
-	vcpu->kvm->stat.pch_pic_write_exits++;
+	vcpu->stat.pch_pic_write_exits++;
 	ret = loongarch_pch_pic_write(s, addr, len, val);
 
 	return ret;

arch/loongarch/kvm/vcpu.c

@@ -20,7 +20,13 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	STATS_DESC_COUNTER(VCPU, idle_exits),
 	STATS_DESC_COUNTER(VCPU, cpucfg_exits),
 	STATS_DESC_COUNTER(VCPU, signal_exits),
-	STATS_DESC_COUNTER(VCPU, hypercall_exits)
+	STATS_DESC_COUNTER(VCPU, hypercall_exits),
+	STATS_DESC_COUNTER(VCPU, ipi_read_exits),
+	STATS_DESC_COUNTER(VCPU, ipi_write_exits),
+	STATS_DESC_COUNTER(VCPU, eiointc_read_exits),
+	STATS_DESC_COUNTER(VCPU, eiointc_write_exits),
+	STATS_DESC_COUNTER(VCPU, pch_pic_read_exits),
+	STATS_DESC_COUNTER(VCPU, pch_pic_write_exits)
 };
 
 const struct kvm_stats_header kvm_vcpu_stats_header = {