Merge tag 'loongarch-kvm-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson into HEAD

LoongArch KVM changes for v6.19 1. Get VM PMU capability from HW GCFG register. 2. Add AVEC basic support. 3. Use 64-bit register definition for EIOINTC. 4. Add KVM timer test cases for tools/selftests.
2025-12-27 11:06:41 -05:00 · 2025-12-02 18:34:22 +01:00
parent 679fcce002 0f90fa6e2e
commit 8040280405
15 changed files with 536 additions and 109 deletions
--- a/arch/loongarch/include/asm/kvm_eiointc.h
+++ b/arch/loongarch/include/asm/kvm_eiointc.h
@@ -10,10 +10,7 @@

 #define EIOINTC_IRQS			256
 #define EIOINTC_ROUTE_MAX_VCPUS		256
-#define EIOINTC_IRQS_U8_NUMS		(EIOINTC_IRQS / 8)
-#define EIOINTC_IRQS_U16_NUMS		(EIOINTC_IRQS_U8_NUMS / 2)
-#define EIOINTC_IRQS_U32_NUMS		(EIOINTC_IRQS_U8_NUMS / 4)
-#define EIOINTC_IRQS_U64_NUMS		(EIOINTC_IRQS_U8_NUMS / 8)
+#define EIOINTC_IRQS_U64_NUMS		(EIOINTC_IRQS / 64)
 /* map to ipnum per 32 irqs */
 #define EIOINTC_IRQS_NODETYPE_COUNT	16

@@ -64,54 +61,18 @@ struct loongarch_eiointc {
 	uint32_t status;

 	/* hardware state */
-	union nodetype {
-		u64 reg_u64[EIOINTC_IRQS_NODETYPE_COUNT / 4];
-		u32 reg_u32[EIOINTC_IRQS_NODETYPE_COUNT / 2];
-		u16 reg_u16[EIOINTC_IRQS_NODETYPE_COUNT];
-		u8 reg_u8[EIOINTC_IRQS_NODETYPE_COUNT * 2];
-	} nodetype;
+	u64 nodetype[EIOINTC_IRQS_NODETYPE_COUNT / 4];

 	/* one bit shows the state of one irq */
-	union bounce {
-		u64 reg_u64[EIOINTC_IRQS_U64_NUMS];
-		u32 reg_u32[EIOINTC_IRQS_U32_NUMS];
-		u16 reg_u16[EIOINTC_IRQS_U16_NUMS];
-		u8 reg_u8[EIOINTC_IRQS_U8_NUMS];
-	} bounce;
-
-	union isr {
-		u64 reg_u64[EIOINTC_IRQS_U64_NUMS];
-		u32 reg_u32[EIOINTC_IRQS_U32_NUMS];
-		u16 reg_u16[EIOINTC_IRQS_U16_NUMS];
-		u8 reg_u8[EIOINTC_IRQS_U8_NUMS];
-	} isr;
-	union coreisr {
-		u64 reg_u64[EIOINTC_ROUTE_MAX_VCPUS][EIOINTC_IRQS_U64_NUMS];
-		u32 reg_u32[EIOINTC_ROUTE_MAX_VCPUS][EIOINTC_IRQS_U32_NUMS];
-		u16 reg_u16[EIOINTC_ROUTE_MAX_VCPUS][EIOINTC_IRQS_U16_NUMS];
-		u8 reg_u8[EIOINTC_ROUTE_MAX_VCPUS][EIOINTC_IRQS_U8_NUMS];
-	} coreisr;
-	union enable {
-		u64 reg_u64[EIOINTC_IRQS_U64_NUMS];
-		u32 reg_u32[EIOINTC_IRQS_U32_NUMS];
-		u16 reg_u16[EIOINTC_IRQS_U16_NUMS];
-		u8 reg_u8[EIOINTC_IRQS_U8_NUMS];
-	} enable;
+	u64 bounce[EIOINTC_IRQS_U64_NUMS];
+	u64 isr[EIOINTC_IRQS_U64_NUMS];
+	u64 coreisr[EIOINTC_ROUTE_MAX_VCPUS][EIOINTC_IRQS_U64_NUMS];
+	u64 enable[EIOINTC_IRQS_U64_NUMS];

 	/* use one byte to config ipmap for 32 irqs at once */
-	union ipmap {
-		u64 reg_u64;
-		u32 reg_u32[EIOINTC_IRQS_U32_NUMS / 4];
-		u16 reg_u16[EIOINTC_IRQS_U16_NUMS / 4];
-		u8 reg_u8[EIOINTC_IRQS_U8_NUMS / 4];
-	} ipmap;
+	u64 ipmap;
 	/* use one byte to config coremap for one irq */
-	union coremap {
-		u64 reg_u64[EIOINTC_IRQS / 8];
-		u32 reg_u32[EIOINTC_IRQS / 4];
-		u16 reg_u16[EIOINTC_IRQS / 2];
-		u8 reg_u8[EIOINTC_IRQS];
-	} coremap;
+	u64 coremap[EIOINTC_IRQS / 8];

 	DECLARE_BITMAP(sw_coreisr[EIOINTC_ROUTE_MAX_VCPUS][LOONGSON_IP_NUM], EIOINTC_IRQS);
 	uint8_t  sw_coremap[EIOINTC_IRQS];
--- a/arch/loongarch/include/asm/kvm_host.h
+++ b/arch/loongarch/include/asm/kvm_host.h
@@ -126,6 +126,8 @@ struct kvm_arch {
 	struct kvm_phyid_map  *phyid_map;
 	/* Enabled PV features */
 	unsigned long pv_features;
+	/* Supported KVM features */
+	unsigned long kvm_features;

 	s64 time_offset;
 	struct kvm_context __percpu *vmcs;
@@ -293,6 +295,12 @@ static inline int kvm_get_pmu_num(struct kvm_vcpu_arch *arch)
 	return (arch->cpucfg[6] & CPUCFG6_PMNUM) >> CPUCFG6_PMNUM_SHIFT;
 }

+/* Check whether KVM support this feature (VMM may disable it) */
+static inline bool kvm_vm_support(struct kvm_arch *arch, int feature)
+{
+	return !!(arch->kvm_features & BIT_ULL(feature));
+}
+
 bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu);

 /* Debug: dump vcpu state */
--- a/arch/loongarch/include/asm/kvm_vcpu.h
+++ b/arch/loongarch/include/asm/kvm_vcpu.h
@@ -15,6 +15,7 @@
 #define CPU_PMU				(_ULCAST_(1) << 10)
 #define CPU_TIMER			(_ULCAST_(1) << 11)
 #define CPU_IPI				(_ULCAST_(1) << 12)
+#define CPU_AVEC                        (_ULCAST_(1) << 14)

 /* Controlled by 0x52 guest exception VIP aligned to estat bit 5~12 */
 #define CPU_IP0				(_ULCAST_(1))
--- a/arch/loongarch/include/asm/loongarch.h
+++ b/arch/loongarch/include/asm/loongarch.h
@@ -511,6 +511,8 @@
 #define  CSR_GCFG_GPERF_SHIFT		24
 #define  CSR_GCFG_GPERF_WIDTH		3
 #define  CSR_GCFG_GPERF			(_ULCAST_(0x7) << CSR_GCFG_GPERF_SHIFT)
+#define  CSR_GCFG_GPMP_SHIFT		23
+#define  CSR_GCFG_GPMP			(_ULCAST_(0x1) << CSR_GCFG_GPMP_SHIFT)
 #define  CSR_GCFG_GCI_SHIFT		20
 #define  CSR_GCFG_GCI_WIDTH		2
 #define  CSR_GCFG_GCI			(_ULCAST_(0x3) << CSR_GCFG_GCI_SHIFT)
--- a/arch/loongarch/include/uapi/asm/kvm.h
+++ b/arch/loongarch/include/uapi/asm/kvm.h
@@ -104,6 +104,7 @@ struct kvm_fpu {
 #define  KVM_LOONGARCH_VM_FEAT_PV_IPI		6
 #define  KVM_LOONGARCH_VM_FEAT_PV_STEALTIME	7
 #define  KVM_LOONGARCH_VM_FEAT_PTW		8
+#define  KVM_LOONGARCH_VM_FEAT_MSGINT		9

 /* Device Control API on vcpu fd */
 #define KVM_LOONGARCH_VCPU_CPUCFG	0
--- a/arch/loongarch/kvm/intc/eiointc.c
+++ b/arch/loongarch/kvm/intc/eiointc.c
@@ -13,19 +13,19 @@ static void eiointc_set_sw_coreisr(struct loongarch_eiointc *s)
 	struct kvm_vcpu *vcpu;

 	for (irq = 0; irq < EIOINTC_IRQS; irq++) {
-		ipnum = s->ipmap.reg_u8[irq / 32];
+		ipnum = (s->ipmap >> (irq / 32 * 8)) & 0xff;
 		if (!(s->status & BIT(EIOINTC_ENABLE_INT_ENCODE))) {
 			ipnum = count_trailing_zeros(ipnum);
 			ipnum = (ipnum >= 0 && ipnum < 4) ? ipnum : 0;
 		}

-		cpuid = s->coremap.reg_u8[irq];
+		cpuid = ((u8 *)s->coremap)[irq];
 		vcpu = kvm_get_vcpu_by_cpuid(s->kvm, cpuid);
 		if (!vcpu)
 			continue;

 		cpu = vcpu->vcpu_id;
-		if (test_bit(irq, (unsigned long *)s->coreisr.reg_u32[cpu]))
+		if (test_bit(irq, (unsigned long *)s->coreisr[cpu]))
 			__set_bit(irq, s->sw_coreisr[cpu][ipnum]);
 		else
 			__clear_bit(irq, s->sw_coreisr[cpu][ipnum]);
@@ -38,7 +38,7 @@ static void eiointc_update_irq(struct loongarch_eiointc *s, int irq, int level)
 	struct kvm_vcpu *vcpu;
 	struct kvm_interrupt vcpu_irq;

-	ipnum = s->ipmap.reg_u8[irq / 32];
+	ipnum = (s->ipmap >> (irq / 32 * 8)) & 0xff;
 	if (!(s->status & BIT(EIOINTC_ENABLE_INT_ENCODE))) {
 		ipnum = count_trailing_zeros(ipnum);
 		ipnum = (ipnum >= 0 && ipnum < 4) ? ipnum : 0;
@@ -53,13 +53,13 @@ static void eiointc_update_irq(struct loongarch_eiointc *s, int irq, int level)

 	if (level) {
 		/* if not enable return false */
-		if (!test_bit(irq, (unsigned long *)s->enable.reg_u32))
+		if (!test_bit(irq, (unsigned long *)s->enable))
 			return;
-		__set_bit(irq, (unsigned long *)s->coreisr.reg_u32[cpu]);
+		__set_bit(irq, (unsigned long *)s->coreisr[cpu]);
 		found = find_first_bit(s->sw_coreisr[cpu][ipnum], EIOINTC_IRQS);
 		__set_bit(irq, s->sw_coreisr[cpu][ipnum]);
 	} else {
-		__clear_bit(irq, (unsigned long *)s->coreisr.reg_u32[cpu]);
+		__clear_bit(irq, (unsigned long *)s->coreisr[cpu]);
 		__clear_bit(irq, s->sw_coreisr[cpu][ipnum]);
 		found = find_first_bit(s->sw_coreisr[cpu][ipnum], EIOINTC_IRQS);
 	}
@@ -94,7 +94,7 @@ static inline void eiointc_update_sw_coremap(struct loongarch_eiointc *s,
 		if (s->sw_coremap[irq + i] == cpu)
 			continue;

-		if (notify && test_bit(irq + i, (unsigned long *)s->isr.reg_u8)) {
+		if (notify && test_bit(irq + i, (unsigned long *)s->isr)) {
 			/* lower irq at old cpu and raise irq at new cpu */
 			eiointc_update_irq(s, irq + i, 0);
 			s->sw_coremap[irq + i] = cpu;
@@ -108,7 +108,7 @@ static inline void eiointc_update_sw_coremap(struct loongarch_eiointc *s,
 void eiointc_set_irq(struct loongarch_eiointc *s, int irq, int level)
 {
 	unsigned long flags;
-	unsigned long *isr = (unsigned long *)s->isr.reg_u8;
+	unsigned long *isr = (unsigned long *)s->isr;

 	spin_lock_irqsave(&s->lock, flags);
 	level ? __set_bit(irq, isr) : __clear_bit(irq, isr);
@@ -127,27 +127,27 @@ static int loongarch_eiointc_read(struct kvm_vcpu *vcpu, struct loongarch_eioint
 	switch (offset) {
 	case EIOINTC_NODETYPE_START ... EIOINTC_NODETYPE_END:
 		index = (offset - EIOINTC_NODETYPE_START) >> 3;
-		data = s->nodetype.reg_u64[index];
+		data = s->nodetype[index];
 		break;
 	case EIOINTC_IPMAP_START ... EIOINTC_IPMAP_END:
 		index = (offset - EIOINTC_IPMAP_START) >> 3;
-		data = s->ipmap.reg_u64;
+		data = s->ipmap;
 		break;
 	case EIOINTC_ENABLE_START ... EIOINTC_ENABLE_END:
 		index = (offset - EIOINTC_ENABLE_START) >> 3;
-		data = s->enable.reg_u64[index];
+		data = s->enable[index];
 		break;
 	case EIOINTC_BOUNCE_START ... EIOINTC_BOUNCE_END:
 		index = (offset - EIOINTC_BOUNCE_START) >> 3;
-		data = s->bounce.reg_u64[index];
+		data = s->bounce[index];
 		break;
 	case EIOINTC_COREISR_START ... EIOINTC_COREISR_END:
 		index = (offset - EIOINTC_COREISR_START) >> 3;
-		data = s->coreisr.reg_u64[vcpu->vcpu_id][index];
+		data = s->coreisr[vcpu->vcpu_id][index];
 		break;
 	case EIOINTC_COREMAP_START ... EIOINTC_COREMAP_END:
 		index = (offset - EIOINTC_COREMAP_START) >> 3;
-		data = s->coremap.reg_u64[index];
+		data = s->coremap[index];
 		break;
 	default:
 		ret = -EINVAL;
@@ -223,26 +223,26 @@ static int loongarch_eiointc_write(struct kvm_vcpu *vcpu,
 	switch (offset) {
 	case EIOINTC_NODETYPE_START ... EIOINTC_NODETYPE_END:
 		index = (offset - EIOINTC_NODETYPE_START) >> 3;
-		old = s->nodetype.reg_u64[index];
-		s->nodetype.reg_u64[index] = (old & ~mask) | data;
+		old = s->nodetype[index];
+		s->nodetype[index] = (old & ~mask) | data;
 		break;
 	case EIOINTC_IPMAP_START ... EIOINTC_IPMAP_END:
 		/*
 		 * ipmap cannot be set at runtime, can be set only at the beginning
 		 * of irqchip driver, need not update upper irq level
 		 */
-		old = s->ipmap.reg_u64;
-		s->ipmap.reg_u64 = (old & ~mask) | data;
+		old = s->ipmap;
+		s->ipmap = (old & ~mask) | data;
 		break;
 	case EIOINTC_ENABLE_START ... EIOINTC_ENABLE_END:
 		index = (offset - EIOINTC_ENABLE_START) >> 3;
-		old = s->enable.reg_u64[index];
-		s->enable.reg_u64[index] = (old & ~mask) | data;
+		old = s->enable[index];
+		s->enable[index] = (old & ~mask) | data;
 		/*
 		 * 1: enable irq.
 		 * update irq when isr is set.
 		 */
-		data = s->enable.reg_u64[index] & ~old & s->isr.reg_u64[index];
+		data = s->enable[index] & ~old & s->isr[index];
 		while (data) {
 			irq = __ffs(data);
 			eiointc_update_irq(s, irq + index * 64, 1);
@@ -252,7 +252,7 @@ static int loongarch_eiointc_write(struct kvm_vcpu *vcpu,
 		 * 0: disable irq.
 		 * update irq when isr is set.
 		 */
-		data = ~s->enable.reg_u64[index] & old & s->isr.reg_u64[index];
+		data = ~s->enable[index] & old & s->isr[index];
 		while (data) {
 			irq = __ffs(data);
 			eiointc_update_irq(s, irq + index * 64, 0);
@@ -262,16 +262,16 @@ static int loongarch_eiointc_write(struct kvm_vcpu *vcpu,
 	case EIOINTC_BOUNCE_START ... EIOINTC_BOUNCE_END:
 		/* do not emulate hw bounced irq routing */
 		index = (offset - EIOINTC_BOUNCE_START) >> 3;
-		old = s->bounce.reg_u64[index];
-		s->bounce.reg_u64[index] = (old & ~mask) | data;
+		old = s->bounce[index];
+		s->bounce[index] = (old & ~mask) | data;
 		break;
 	case EIOINTC_COREISR_START ... EIOINTC_COREISR_END:
 		index = (offset - EIOINTC_COREISR_START) >> 3;
 		/* use attrs to get current cpu index */
 		cpu = vcpu->vcpu_id;
-		old = s->coreisr.reg_u64[cpu][index];
+		old = s->coreisr[cpu][index];
 		/* write 1 to clear interrupt */
-		s->coreisr.reg_u64[cpu][index] = old & ~data;
+		s->coreisr[cpu][index] = old & ~data;
 		data &= old;
 		while (data) {
 			irq = __ffs(data);
@@ -281,9 +281,9 @@ static int loongarch_eiointc_write(struct kvm_vcpu *vcpu,
 		break;
 	case EIOINTC_COREMAP_START ... EIOINTC_COREMAP_END:
 		index = (offset - EIOINTC_COREMAP_START) >> 3;
-		old = s->coremap.reg_u64[index];
-		s->coremap.reg_u64[index] = (old & ~mask) | data;
-		data = s->coremap.reg_u64[index];
+		old = s->coremap[index];
+		s->coremap[index] = (old & ~mask) | data;
+		data = s->coremap[index];
 		eiointc_update_sw_coremap(s, index * 8, data, sizeof(data), true);
 		break;
 	default:
@@ -451,10 +451,10 @@ static int kvm_eiointc_ctrl_access(struct kvm_device *dev,
 		break;
 	case KVM_DEV_LOONGARCH_EXTIOI_CTRL_LOAD_FINISHED:
 		eiointc_set_sw_coreisr(s);
-		for (i = 0; i < (EIOINTC_IRQS / 4); i++) {
-			start_irq = i * 4;
+		for (i = 0; i < (EIOINTC_IRQS / 8); i++) {
+			start_irq = i * 8;
 			eiointc_update_sw_coremap(s, start_irq,
-					s->coremap.reg_u32[i], sizeof(u32), false);
+					s->coremap[i], sizeof(u64), false);
 		}
 		break;
 	default:
@@ -481,34 +481,34 @@ static int kvm_eiointc_regs_access(struct kvm_device *dev,
 	switch (addr) {
 	case EIOINTC_NODETYPE_START ... EIOINTC_NODETYPE_END:
 		offset = (addr - EIOINTC_NODETYPE_START) / 4;
-		p = &s->nodetype.reg_u32[offset];
+		p = s->nodetype + offset * 4;
 		break;
 	case EIOINTC_IPMAP_START ... EIOINTC_IPMAP_END:
 		offset = (addr - EIOINTC_IPMAP_START) / 4;
-		p = &s->ipmap.reg_u32[offset];
+		p = &s->ipmap + offset * 4;
 		break;
 	case EIOINTC_ENABLE_START ... EIOINTC_ENABLE_END:
 		offset = (addr - EIOINTC_ENABLE_START) / 4;
-		p = &s->enable.reg_u32[offset];
+		p = s->enable + offset * 4;
 		break;
 	case EIOINTC_BOUNCE_START ... EIOINTC_BOUNCE_END:
 		offset = (addr - EIOINTC_BOUNCE_START) / 4;
-		p = &s->bounce.reg_u32[offset];
+		p = s->bounce + offset * 4;
 		break;
 	case EIOINTC_ISR_START ... EIOINTC_ISR_END:
 		offset = (addr - EIOINTC_ISR_START) / 4;
-		p = &s->isr.reg_u32[offset];
+		p = s->isr + offset * 4;
 		break;
 	case EIOINTC_COREISR_START ... EIOINTC_COREISR_END:
 		if (cpu >= s->num_cpu)
 			return -EINVAL;

 		offset = (addr - EIOINTC_COREISR_START) / 4;
-		p = &s->coreisr.reg_u32[cpu][offset];
+		p = s->coreisr[cpu] + offset * 4;
 		break;
 	case EIOINTC_COREMAP_START ... EIOINTC_COREMAP_END:
 		offset = (addr - EIOINTC_COREMAP_START) / 4;
-		p = &s->coremap.reg_u32[offset];
+		p = s->coremap + offset * 4;
 		break;
 	default:
 		kvm_err("%s: unknown eiointc register, addr = %d\n", __func__, addr);
--- a/arch/loongarch/kvm/interrupt.c
+++ b/arch/loongarch/kvm/interrupt.c
@@ -21,6 +21,7 @@ static unsigned int priority_to_irq[EXCCODE_INT_NUM] = {
 	[INT_HWI5]	= CPU_IP5,
 	[INT_HWI6]	= CPU_IP6,
 	[INT_HWI7]	= CPU_IP7,
+	[INT_AVEC]	= CPU_AVEC,
 };

 static int kvm_irq_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
@@ -31,6 +32,11 @@ static int kvm_irq_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
 	if (priority < EXCCODE_INT_NUM)
 		irq = priority_to_irq[priority];

+	if (cpu_has_msgint && (priority == INT_AVEC)) {
+		set_gcsr_estat(irq);
+		return 1;
+	}
+
 	switch (priority) {
 	case INT_TI:
 	case INT_IPI:
@@ -58,6 +64,11 @@ static int kvm_irq_clear(struct kvm_vcpu *vcpu, unsigned int priority)
 	if (priority < EXCCODE_INT_NUM)
 		irq = priority_to_irq[priority];

+	if (cpu_has_msgint && (priority == INT_AVEC)) {
+		clear_gcsr_estat(irq);
+		return 1;
+	}
+
 	switch (priority) {
 	case INT_TI:
 	case INT_IPI:
@@ -83,10 +94,10 @@ void kvm_deliver_intr(struct kvm_vcpu *vcpu)
 	unsigned long *pending = &vcpu->arch.irq_pending;
 	unsigned long *pending_clr = &vcpu->arch.irq_clear;

-	for_each_set_bit(priority, pending_clr, INT_IPI + 1)
+	for_each_set_bit(priority, pending_clr, EXCCODE_INT_NUM)
 		kvm_irq_clear(vcpu, priority);

-	for_each_set_bit(priority, pending, INT_IPI + 1)
+	for_each_set_bit(priority, pending, EXCCODE_INT_NUM)
 		kvm_irq_deliver(vcpu, priority);
 }

--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -659,8 +659,7 @@ static int _kvm_get_cpucfg_mask(int id, u64 *v)
 		*v = GENMASK(31, 0);
 		return 0;
 	case LOONGARCH_CPUCFG1:
-		/* CPUCFG1_MSGINT is not supported by KVM */
-		*v = GENMASK(25, 0);
+		*v = GENMASK(26, 0);
 		return 0;
 	case LOONGARCH_CPUCFG2:
 		/* CPUCFG2 features unconditionally supported by KVM */
@@ -728,6 +727,10 @@ static int kvm_check_cpucfg(int id, u64 val)
 		return -EINVAL;

 	switch (id) {
+	case LOONGARCH_CPUCFG1:
+		if ((val & CPUCFG1_MSGINT) && !cpu_has_msgint)
+			return -EINVAL;
+		return 0;
 	case LOONGARCH_CPUCFG2:
 		if (!(val & CPUCFG2_LLFTP))
 			/* Guests must have a constant timer */
@@ -1657,6 +1660,12 @@ static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2);
 	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3);
 	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL);
+	if (cpu_has_msgint) {
+		kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ISR0);
+		kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ISR1);
+		kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ISR2);
+		kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ISR3);
+	}

 	/* Restore Root.GINTC from unused Guest.GINTC register */
 	write_csr_gintc(csr->csrs[LOONGARCH_CSR_GINTC]);
@@ -1746,6 +1755,12 @@ static int _kvm_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
 	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1);
 	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2);
 	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3);
+	if (cpu_has_msgint) {
+		kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ISR0);
+		kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ISR1);
+		kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ISR2);
+		kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ISR3);
+	}

 	vcpu->arch.aux_inuse |= KVM_LARCH_SWCSR_LATEST;

--- a/arch/loongarch/kvm/vm.c
+++ b/arch/loongarch/kvm/vm.c
@@ -6,6 +6,7 @@
 #include <linux/kvm_host.h>
 #include <asm/kvm_mmu.h>
 #include <asm/kvm_vcpu.h>
+#include <asm/kvm_csr.h>
 #include <asm/kvm_eiointc.h>
 #include <asm/kvm_pch_pic.h>

@@ -24,6 +25,23 @@ const struct kvm_stats_header kvm_vm_stats_header = {
 					sizeof(kvm_vm_stats_desc),
 };

+static void kvm_vm_init_features(struct kvm *kvm)
+{
+	unsigned long val;
+
+	val = read_csr_gcfg();
+	if (val & CSR_GCFG_GPMP)
+		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PMU);
+
+	/* Enable all PV features by default */
+	kvm->arch.pv_features = BIT(KVM_FEATURE_IPI);
+	kvm->arch.kvm_features = BIT(KVM_LOONGARCH_VM_FEAT_PV_IPI);
+	if (kvm_pvtime_supported()) {
+		kvm->arch.pv_features |= BIT(KVM_FEATURE_STEAL_TIME);
+		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PV_STEALTIME);
+	}
+}
+
 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 {
 	int i;
@@ -42,11 +60,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 	spin_lock_init(&kvm->arch.phyid_map_lock);

 	kvm_init_vmcs(kvm);
-
-	/* Enable all PV features by default */
-	kvm->arch.pv_features = BIT(KVM_FEATURE_IPI);
-	if (kvm_pvtime_supported())
-		kvm->arch.pv_features |= BIT(KVM_FEATURE_STEAL_TIME);
+	kvm_vm_init_features(kvm);

 	/*
 	 * cpu_vabits means user address space only (a half of total).
@@ -136,20 +150,20 @@ static int kvm_vm_feature_has_attr(struct kvm *kvm, struct kvm_device_attr *attr
 		if (cpu_has_lbt_mips)
 			return 0;
 		return -ENXIO;
-	case KVM_LOONGARCH_VM_FEAT_PMU:
-		if (cpu_has_pmp)
-			return 0;
-		return -ENXIO;
-	case KVM_LOONGARCH_VM_FEAT_PV_IPI:
-		return 0;
-	case KVM_LOONGARCH_VM_FEAT_PV_STEALTIME:
-		if (kvm_pvtime_supported())
-			return 0;
-		return -ENXIO;
 	case KVM_LOONGARCH_VM_FEAT_PTW:
 		if (cpu_has_ptw)
 			return 0;
 		return -ENXIO;
+	case KVM_LOONGARCH_VM_FEAT_MSGINT:
+		if (cpu_has_msgint)
+			return 0;
+		return -ENXIO;
+	case KVM_LOONGARCH_VM_FEAT_PMU:
+	case KVM_LOONGARCH_VM_FEAT_PV_IPI:
+	case KVM_LOONGARCH_VM_FEAT_PV_STEALTIME:
+		if (kvm_vm_support(&kvm->arch, attr->attr))
+			return 0;
+		return -ENXIO;
 	default:
 		return -ENXIO;
 	}
--- a/tools/testing/selftests/kvm/Makefile.kvm
+++ b/tools/testing/selftests/kvm/Makefile.kvm
@@ -212,6 +212,7 @@ TEST_GEN_PROGS_riscv += mmu_stress_test
 TEST_GEN_PROGS_riscv += rseq_test
 TEST_GEN_PROGS_riscv += steal_time

+TEST_GEN_PROGS_loongarch = arch_timer
 TEST_GEN_PROGS_loongarch += coalesced_io_test
 TEST_GEN_PROGS_loongarch += demand_paging_test
 TEST_GEN_PROGS_loongarch += dirty_log_perf_test
--- a/tools/testing/selftests/kvm/include/loongarch/arch_timer.h
+++ b/tools/testing/selftests/kvm/include/loongarch/arch_timer.h
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * LoongArch Constant Timer specific interface
+ */
+#ifndef SELFTEST_KVM_ARCH_TIMER_H
+#define SELFTEST_KVM_ARCH_TIMER_H
+
+#include "processor.h"
+
+/* LoongArch timer frequency is constant 100MHZ */
+#define TIMER_FREQ		(100UL << 20)
+#define msec_to_cycles(msec)	(TIMER_FREQ * (unsigned long)(msec) / 1000)
+#define usec_to_cycles(usec)	(TIMER_FREQ * (unsigned long)(usec) / 1000000)
+#define cycles_to_usec(cycles)	((unsigned long)(cycles) * 1000000 / TIMER_FREQ)
+
+static inline unsigned long timer_get_cycles(void)
+{
+	unsigned long val = 0;
+
+	__asm__ __volatile__(
+		"rdtime.d %0, $zero\n\t"
+		: "=r"(val)
+		:
+	);
+
+	return val;
+}
+
+static inline unsigned long timer_get_cfg(void)
+{
+	return csr_read(LOONGARCH_CSR_TCFG);
+}
+
+static inline unsigned long timer_get_val(void)
+{
+	return csr_read(LOONGARCH_CSR_TVAL);
+}
+
+static inline void disable_timer(void)
+{
+	csr_write(0, LOONGARCH_CSR_TCFG);
+}
+
+static inline void timer_irq_enable(void)
+{
+	unsigned long val;
+
+	val = csr_read(LOONGARCH_CSR_ECFG);
+	val |= ECFGF_TIMER;
+	csr_write(val, LOONGARCH_CSR_ECFG);
+}
+
+static inline void timer_irq_disable(void)
+{
+	unsigned long val;
+
+	val = csr_read(LOONGARCH_CSR_ECFG);
+	val &= ~ECFGF_TIMER;
+	csr_write(val, LOONGARCH_CSR_ECFG);
+}
+
+static inline void timer_set_next_cmp_ms(unsigned int msec, bool period)
+{
+	unsigned long val;
+
+	val = msec_to_cycles(msec) & CSR_TCFG_VAL;
+	val |= CSR_TCFG_EN;
+	if (period)
+		val |= CSR_TCFG_PERIOD;
+	csr_write(val, LOONGARCH_CSR_TCFG);
+}
+
+static inline void __delay(uint64_t cycles)
+{
+	uint64_t start = timer_get_cycles();
+
+	while ((timer_get_cycles() - start) < cycles)
+		cpu_relax();
+}
+
+static inline void udelay(unsigned long usec)
+{
+	__delay(usec_to_cycles(usec));
+}
+#endif /* SELFTEST_KVM_ARCH_TIMER_H */
--- a/tools/testing/selftests/kvm/include/loongarch/processor.h
+++ b/tools/testing/selftests/kvm/include/loongarch/processor.h
@@ -83,7 +83,14 @@
 #define LOONGARCH_CSR_PRMD		0x1
 #define LOONGARCH_CSR_EUEN		0x2
 #define LOONGARCH_CSR_ECFG		0x4
+#define  ECFGB_TIMER			11
+#define  ECFGF_TIMER			(BIT_ULL(ECFGB_TIMER))
 #define LOONGARCH_CSR_ESTAT		0x5  /* Exception status */
+#define  CSR_ESTAT_EXC_SHIFT		16
+#define  CSR_ESTAT_EXC_WIDTH		6
+#define  CSR_ESTAT_EXC			(0x3f << CSR_ESTAT_EXC_SHIFT)
+#define    EXCCODE_INT			0    /* Interrupt */
+#define      INT_TI			11   /* Timer interrupt*/
 #define LOONGARCH_CSR_ERA		0x6  /* ERA */
 #define LOONGARCH_CSR_BADV		0x7  /* Bad virtual address */
 #define LOONGARCH_CSR_EENTRY		0xc
@@ -106,6 +113,14 @@
 #define LOONGARCH_CSR_KS1		0x31
 #define LOONGARCH_CSR_TMID		0x40
 #define LOONGARCH_CSR_TCFG		0x41
+#define  CSR_TCFG_VAL			(BIT_ULL(48) - BIT_ULL(2))
+#define  CSR_TCFG_PERIOD_SHIFT		1
+#define  CSR_TCFG_PERIOD		(0x1UL << CSR_TCFG_PERIOD_SHIFT)
+#define  CSR_TCFG_EN			(0x1UL)
+#define LOONGARCH_CSR_TVAL		0x42
+#define LOONGARCH_CSR_TINTCLR		0x44 /* Timer interrupt clear */
+#define  CSR_TINTCLR_TI_SHIFT		0
+#define  CSR_TINTCLR_TI			(1 << CSR_TINTCLR_TI_SHIFT)
 /* TLB refill exception entry */
 #define LOONGARCH_CSR_TLBRENTRY		0x88
 #define LOONGARCH_CSR_TLBRSAVE		0x8b
@@ -113,6 +128,28 @@
 #define  CSR_TLBREHI_PS_SHIFT		0
 #define  CSR_TLBREHI_PS			(0x3fUL << CSR_TLBREHI_PS_SHIFT)

+#define csr_read(csr)				\
+({						\
+	register unsigned long __v;		\
+	__asm__ __volatile__(			\
+		"csrrd %[val], %[reg]\n\t"	\
+		: [val] "=r" (__v)		\
+		: [reg] "i" (csr)		\
+		: "memory");			\
+	__v;					\
+})
+
+#define csr_write(v, csr)			\
+({						\
+	register unsigned long __v = v;		\
+	__asm__ __volatile__ (			\
+		"csrwr %[val], %[reg]\n\t"	\
+		: [val] "+r" (__v)		\
+		: [reg] "i" (csr)		\
+		: "memory");			\
+	__v;					\
+})
+
 #define EXREGS_GPRS			(32)

 #ifndef __ASSEMBLER__
@@ -124,18 +161,60 @@ struct ex_regs {
 	unsigned long pc;
 	unsigned long estat;
 	unsigned long badv;
+	unsigned long prmd;
 };

 #define PC_OFFSET_EXREGS		offsetof(struct ex_regs, pc)
 #define ESTAT_OFFSET_EXREGS		offsetof(struct ex_regs, estat)
 #define BADV_OFFSET_EXREGS		offsetof(struct ex_regs, badv)
+#define PRMD_OFFSET_EXREGS		offsetof(struct ex_regs, prmd)
 #define EXREGS_SIZE			sizeof(struct ex_regs)

+#define VECTOR_NUM			64
+
+typedef void(*handler_fn)(struct ex_regs *);
+
+struct handlers {
+	handler_fn exception_handlers[VECTOR_NUM];
+};
+
+void vm_init_descriptor_tables(struct kvm_vm *vm);
+void vm_install_exception_handler(struct kvm_vm *vm, int vector, handler_fn handler);
+
+static inline void cpu_relax(void)
+{
+	asm volatile("nop" ::: "memory");
+}
+
+static inline void local_irq_enable(void)
+{
+	unsigned int flags = CSR_CRMD_IE;
+	register unsigned int mask asm("$t0") = CSR_CRMD_IE;
+
+	__asm__ __volatile__(
+		"csrxchg %[val], %[mask], %[reg]\n\t"
+		: [val] "+r" (flags)
+		: [mask] "r" (mask), [reg] "i" (LOONGARCH_CSR_CRMD)
+		: "memory");
+}
+
+static inline void local_irq_disable(void)
+{
+	unsigned int flags = 0;
+	register unsigned int mask asm("$t0") = CSR_CRMD_IE;
+
+	__asm__ __volatile__(
+		"csrxchg %[val], %[mask], %[reg]\n\t"
+		: [val] "+r" (flags)
+		: [mask] "r" (mask), [reg] "i" (LOONGARCH_CSR_CRMD)
+		: "memory");
+}
 #else
 #define PC_OFFSET_EXREGS		((EXREGS_GPRS + 0) * 8)
 #define ESTAT_OFFSET_EXREGS		((EXREGS_GPRS + 1) * 8)
 #define BADV_OFFSET_EXREGS		((EXREGS_GPRS + 2) * 8)
-#define EXREGS_SIZE			((EXREGS_GPRS + 3) * 8)
+#define PRMD_OFFSET_EXREGS		((EXREGS_GPRS + 3) * 8)
+#define EXREGS_SIZE			((EXREGS_GPRS + 4) * 8)
 #endif

 #endif /* SELFTEST_KVM_PROCESSOR_H */
--- a/tools/testing/selftests/kvm/lib/loongarch/exception.S
+++ b/tools/testing/selftests/kvm/lib/loongarch/exception.S
@@ -51,9 +51,15 @@ handle_exception:
 	st.d   t0, sp, ESTAT_OFFSET_EXREGS
 	csrrd  t0, LOONGARCH_CSR_BADV
 	st.d   t0, sp, BADV_OFFSET_EXREGS
+	csrrd  t0, LOONGARCH_CSR_PRMD
+	st.d   t0, sp, PRMD_OFFSET_EXREGS

 	or     a0, sp, zero
 	bl route_exception
+	ld.d   t0, sp, PC_OFFSET_EXREGS
+	csrwr  t0, LOONGARCH_CSR_ERA
+	ld.d   t0, sp, PRMD_OFFSET_EXREGS
+	csrwr  t0, LOONGARCH_CSR_PRMD
 	restore_gprs sp
 	csrrd  sp, LOONGARCH_CSR_KS0
 	ertn
--- a/tools/testing/selftests/kvm/lib/loongarch/processor.c
+++ b/tools/testing/selftests/kvm/lib/loongarch/processor.c
@@ -3,6 +3,7 @@
 #include <assert.h>
 #include <linux/compiler.h>

+#include <asm/kvm.h>
 #include "kvm_util.h"
 #include "processor.h"
 #include "ucall_common.h"
@@ -11,6 +12,7 @@
 #define LOONGARCH_GUEST_STACK_VADDR_MIN		0x200000

 static vm_paddr_t invalid_pgtable[4];
+static vm_vaddr_t exception_handlers;

 static uint64_t virt_pte_index(struct kvm_vm *vm, vm_vaddr_t gva, int level)
 {
@@ -183,7 +185,14 @@ void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)

 void route_exception(struct ex_regs *regs)
 {
+	int vector;
 	unsigned long pc, estat, badv;
+	struct handlers *handlers;
+
+	handlers = (struct handlers *)exception_handlers;
+	vector = (regs->estat & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT;
+	if (handlers && handlers->exception_handlers[vector])
+		return handlers->exception_handlers[vector](regs);

 	pc = regs->pc;
 	badv  = regs->badv;
@@ -192,6 +201,32 @@ void route_exception(struct ex_regs *regs)
 	while (1) ;
 }

+void vm_init_descriptor_tables(struct kvm_vm *vm)
+{
+	void *addr;
+
+	vm->handlers = __vm_vaddr_alloc(vm, sizeof(struct handlers),
+			LOONGARCH_GUEST_STACK_VADDR_MIN, MEM_REGION_DATA);
+
+	addr = addr_gva2hva(vm, vm->handlers);
+	memset(addr, 0, vm->page_size);
+	exception_handlers = vm->handlers;
+	sync_global_to_guest(vm, exception_handlers);
+}
+
+void vm_install_exception_handler(struct kvm_vm *vm, int vector, handler_fn handler)
+{
+	struct handlers *handlers = addr_gva2hva(vm, vm->handlers);
+
+	assert(vector < VECTOR_NUM);
+	handlers->exception_handlers[vector] = handler;
+}
+
+uint32_t guest_get_vcpuid(void)
+{
+	return csr_read(LOONGARCH_CSR_CPUID);
+}
+
 void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
 {
 	int i;
@@ -211,6 +246,11 @@ void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
 	vcpu_regs_set(vcpu, &regs);
 }

+static void loongarch_set_reg(struct kvm_vcpu *vcpu, uint64_t id, uint64_t val)
+{
+	__vcpu_set_reg(vcpu, id, val);
+}
+
 static void loongarch_get_csr(struct kvm_vcpu *vcpu, uint64_t id, void *addr)
 {
 	uint64_t csrid;
@@ -242,8 +282,8 @@ static void loongarch_vcpu_setup(struct kvm_vcpu *vcpu)
 		TEST_FAIL("Unknown guest mode, mode: 0x%x", vm->mode);
 	}

-	/* user mode and page enable mode */
-	val = PLV_USER | CSR_CRMD_PG;
+	/* kernel mode and page enable mode */
+	val = PLV_KERN | CSR_CRMD_PG;
 	loongarch_set_csr(vcpu, LOONGARCH_CSR_CRMD, val);
 	loongarch_set_csr(vcpu, LOONGARCH_CSR_PRMD, val);
 	loongarch_set_csr(vcpu, LOONGARCH_CSR_EUEN, 1);
@@ -251,7 +291,10 @@ static void loongarch_vcpu_setup(struct kvm_vcpu *vcpu)
 	loongarch_set_csr(vcpu, LOONGARCH_CSR_TCFG, 0);
 	loongarch_set_csr(vcpu, LOONGARCH_CSR_ASID, 1);

+	/* time count start from 0 */
 	val = 0;
+	loongarch_set_reg(vcpu, KVM_REG_LOONGARCH_COUNTER, val);
+
 	width = vm->page_shift - 3;

 	switch (vm->pgtable_levels) {
--- a/tools/testing/selftests/kvm/loongarch/arch_timer.c
+++ b/tools/testing/selftests/kvm/loongarch/arch_timer.c
@@ -0,0 +1,200 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * The test validates periodic/one-shot constant timer IRQ using
+ * CSR.TCFG and CSR.TVAL registers.
+ */
+#include "arch_timer.h"
+#include "kvm_util.h"
+#include "processor.h"
+#include "timer_test.h"
+#include "ucall_common.h"
+
+static void do_idle(void)
+{
+	unsigned int intid;
+	unsigned long estat;
+
+	__asm__ __volatile__("idle 0" : : : "memory");
+
+	estat = csr_read(LOONGARCH_CSR_ESTAT);
+	intid = !!(estat & BIT(INT_TI));
+
+	/* Make sure pending timer IRQ arrived */
+	GUEST_ASSERT_EQ(intid, 1);
+	csr_write(CSR_TINTCLR_TI, LOONGARCH_CSR_TINTCLR);
+}
+
+static void guest_irq_handler(struct ex_regs *regs)
+{
+	unsigned int intid;
+	uint32_t cpu = guest_get_vcpuid();
+	uint64_t xcnt, val, cfg, xcnt_diff_us;
+	struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
+
+	intid = !!(regs->estat & BIT(INT_TI));
+
+	/* Make sure we are dealing with the correct timer IRQ */
+	GUEST_ASSERT_EQ(intid, 1);
+
+	cfg = timer_get_cfg();
+	if (cfg & CSR_TCFG_PERIOD) {
+		WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter - 1);
+		if (shared_data->nr_iter == 0)
+			disable_timer();
+		csr_write(CSR_TINTCLR_TI, LOONGARCH_CSR_TINTCLR);
+		return;
+	}
+
+	/*
+	 * On real machine, value of LOONGARCH_CSR_TVAL is BIT_ULL(48) - 1
+	 * On virtual machine, its value counts down from BIT_ULL(48) - 1
+	 */
+	val = timer_get_val();
+	xcnt = timer_get_cycles();
+	xcnt_diff_us = cycles_to_usec(xcnt - shared_data->xcnt);
+
+	/* Basic 'timer condition met' check */
+	__GUEST_ASSERT(val > cfg,
+			"val = 0x%lx, cfg = 0x%lx, xcnt_diff_us = 0x%lx",
+			val, cfg, xcnt_diff_us);
+
+	csr_write(CSR_TINTCLR_TI, LOONGARCH_CSR_TINTCLR);
+	WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter + 1);
+}
+
+static void guest_test_period_timer(uint32_t cpu)
+{
+	uint32_t irq_iter, config_iter;
+	uint64_t us;
+	struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
+
+	shared_data->nr_iter = test_args.nr_iter;
+	shared_data->xcnt = timer_get_cycles();
+	us = msecs_to_usecs(test_args.timer_period_ms) + test_args.timer_err_margin_us;
+	timer_set_next_cmp_ms(test_args.timer_period_ms, true);
+
+	for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
+		/* Setup a timeout for the interrupt to arrive */
+		udelay(us);
+	}
+
+	irq_iter = READ_ONCE(shared_data->nr_iter);
+	__GUEST_ASSERT(irq_iter == 0,
+			"irq_iter = 0x%x.\n"
+			"  Guest period timer interrupt was not triggered within the specified\n"
+			"  interval, try to increase the error margin by [-e] option.\n",
+			irq_iter);
+}
+
+static void guest_test_oneshot_timer(uint32_t cpu)
+{
+	uint32_t irq_iter, config_iter;
+	uint64_t us;
+	struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
+
+	shared_data->nr_iter = 0;
+	shared_data->guest_stage = 0;
+	us = msecs_to_usecs(test_args.timer_period_ms) + test_args.timer_err_margin_us;
+	for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
+		shared_data->xcnt = timer_get_cycles();
+
+		/* Setup the next interrupt */
+		timer_set_next_cmp_ms(test_args.timer_period_ms, false);
+		/* Setup a timeout for the interrupt to arrive */
+		udelay(us);
+
+		irq_iter = READ_ONCE(shared_data->nr_iter);
+		__GUEST_ASSERT(config_iter + 1 == irq_iter,
+				"config_iter + 1 = 0x%x, irq_iter = 0x%x.\n"
+				"  Guest timer interrupt was not triggered within the specified\n"
+				"  interval, try to increase the error margin by [-e] option.\n",
+				config_iter + 1, irq_iter);
+	}
+}
+
+static void guest_test_emulate_timer(uint32_t cpu)
+{
+	uint32_t config_iter;
+	uint64_t xcnt_diff_us, us;
+	struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
+
+	local_irq_disable();
+	shared_data->nr_iter = 0;
+	us = msecs_to_usecs(test_args.timer_period_ms);
+	for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
+		shared_data->xcnt = timer_get_cycles();
+
+		/* Setup the next interrupt */
+		timer_set_next_cmp_ms(test_args.timer_period_ms, false);
+		do_idle();
+
+		xcnt_diff_us = cycles_to_usec(timer_get_cycles() - shared_data->xcnt);
+		__GUEST_ASSERT(xcnt_diff_us >= us,
+				"xcnt_diff_us = 0x%lx, us = 0x%lx.\n",
+				xcnt_diff_us, us);
+	}
+	local_irq_enable();
+}
+
+static void guest_time_count_test(uint32_t cpu)
+{
+	uint32_t config_iter;
+	unsigned long start, end, prev, us;
+
+	/* Assuming that test case starts to run in 1 second */
+	start = timer_get_cycles();
+	us = msec_to_cycles(1000);
+	__GUEST_ASSERT(start <= us,
+			"start = 0x%lx, us = 0x%lx.\n",
+			start, us);
+
+	us = msec_to_cycles(test_args.timer_period_ms);
+	for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
+		start = timer_get_cycles();
+		end = start + us;
+		/* test time count growing up always */
+		while (start < end) {
+			prev = start;
+			start = timer_get_cycles();
+			__GUEST_ASSERT(prev <= start,
+					"prev = 0x%lx, start = 0x%lx.\n",
+					prev, start);
+		}
+	}
+}
+
+static void guest_code(void)
+{
+	uint32_t cpu = guest_get_vcpuid();
+
+	/* must run at first */
+	guest_time_count_test(cpu);
+
+	timer_irq_enable();
+	local_irq_enable();
+	guest_test_period_timer(cpu);
+	guest_test_oneshot_timer(cpu);
+	guest_test_emulate_timer(cpu);
+
+	GUEST_DONE();
+}
+
+struct kvm_vm *test_vm_create(void)
+{
+	struct kvm_vm *vm;
+	int nr_vcpus = test_args.nr_vcpus;
+
+	vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus);
+	vm_init_descriptor_tables(vm);
+	vm_install_exception_handler(vm, EXCCODE_INT, guest_irq_handler);
+
+	/* Make all the test's cmdline args visible to the guest */
+	sync_global_to_guest(vm, test_args);
+
+	return vm;
+}
+
+void test_vm_cleanup(struct kvm_vm *vm)
+{
+	kvm_vm_free(vm);
+}