diff --git a/arch/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c
index 459583c985be0f91105689049713458489d0a076..76845a225e975f904712b6adb9667622bfec6efc 100644
--- a/arch/loongarch/kernel/efi.c
+++ b/arch/loongarch/kernel/efi.c
@@ -328,6 +328,18 @@ void __init efi_init(void)
 		if (efi_memmap_init_early(&data) < 0)
 			panic("Unable to map EFI memory map.\n");
 
+		/*
+		 * Reserve the physical memory region occupied by the EFI
+		 * memory map table (header + descriptors). This is crucial
+		 * for kdump, as the kdump kernel relies on this original
+		 * memmap passed by the bootloader. Without reservation,
+		 * this region could be overwritten by the primary kernel.
+		 * Also, set the EFI_PRESERVE_BS_REGIONS flag to indicate that
+		 * critical boot services data regions like this are preserved.
+		 */
+		memblock_reserve((phys_addr_t)boot_memmap, sizeof(*tbl) + data.size);
+		set_bit(EFI_PRESERVE_BS_REGIONS, &efi.flags);
+
 		early_memunmap(tbl, sizeof(*tbl));
 	}
 }
diff --git a/arch/loongarch/kvm/intc/extioi.c b/arch/loongarch/kvm/intc/extioi.c
index 440bd8733daeb351ea2ea2d4825b2519ec55aed7..227348d5fe72e1472ba9d06e44ecd722633997fc 100644
--- a/arch/loongarch/kvm/intc/extioi.c
+++ b/arch/loongarch/kvm/intc/extioi.c
@@ -244,11 +244,10 @@ static int loongarch_extioi_writew(struct kvm_vcpu *vcpu,
 		 * update irq when isr is set.
 		 */
 		data = s->enable.reg_u32[index] & ~old_data & s->isr.reg_u32[index];
-		index = index << 2;
 		for (i = 0; i < sizeof(data); i++) {
 			u8 mask = (data >> (i * 8)) & 0xff;
 
-			extioi_enable_irq(vcpu, s, index + i, mask, 1);
+			extioi_enable_irq(vcpu, s, index * 4 + i, mask, 1);
 		}
 		/*
 		 * 0: disable irq.
@@ -258,7 +257,7 @@ static int loongarch_extioi_writew(struct kvm_vcpu *vcpu,
 		for (i = 0; i < sizeof(data); i++) {
 			u8 mask = (data >> (i * 8)) & 0xff;
 
-			extioi_enable_irq(vcpu, s, index, mask, 0);
+			extioi_enable_irq(vcpu, s, index * 4 + i, mask, 0);
 		}
 		break;
 	case EXTIOI_BOUNCE_START ... EXTIOI_BOUNCE_END:
@@ -331,11 +330,10 @@ static int loongarch_extioi_writel(struct kvm_vcpu *vcpu,
 		 * update irq when isr is set.
 		 */
 		data = s->enable.reg_u64[index] & ~old_data & s->isr.reg_u64[index];
-		index = index << 3;
 		for (i = 0; i < sizeof(data); i++) {
 			u8 mask = (data >> (i * 8)) & 0xff;
 
-			extioi_enable_irq(vcpu, s, index + i, mask, 1);
+			extioi_enable_irq(vcpu, s, index * 8 + i, mask, 1);
 		}
 		/*
 		 * 0: disable irq.
@@ -345,7 +343,7 @@ static int loongarch_extioi_writel(struct kvm_vcpu *vcpu,
 		for (i = 0; i < sizeof(data); i++) {
 			u8 mask = (data >> (i * 8)) & 0xff;
 
-			extioi_enable_irq(vcpu, s, index, mask, 0);
+			extioi_enable_irq(vcpu, s, index * 8 + i, mask, 0);
 		}
 		break;
 	case EXTIOI_BOUNCE_START ... EXTIOI_BOUNCE_END:
diff --git a/drivers/gpio/gpio-loongson-64bit.c b/drivers/gpio/gpio-loongson-64bit.c
index f916a5ae0290a19f75586fe57e61bd657929c9f9..7363736830e1b80e81f7400814debcd08b01f776 100644
--- a/drivers/gpio/gpio-loongson-64bit.c
+++ b/drivers/gpio/gpio-loongson-64bit.c
@@ -334,10 +334,10 @@ static const struct loongson_gpio_chip_data loongson_gpio_ls7a2000_data0 = {
 
 static const struct loongson_gpio_chip_data loongson_gpio_ls7a2000_data1 = {
 	.label = "ls7a2000_gpio",
-	.mode = BYTE_CTRL_MODE,
-	.conf_offset = 0x84,
-	.in_offset = 0x88,
-	.out_offset = 0x80,
+	.mode = BIT_CTRL_MODE,
+	.conf_offset = 0x4,
+	.in_offset = 0x8,
+	.out_offset = 0x0,
 };
 
 static const struct loongson_gpio_chip_data loongson_gpio_ls3a6000_data = {
diff --git a/drivers/iommu/loongarch_iommu.c b/drivers/iommu/loongarch_iommu.c
index 63d0d2ce3c0ea15740a59d9dd3820d7da77bce59..6905f2d3ddb8f52cd01d04960a260ea8dd36cd04 100644
--- a/drivers/iommu/loongarch_iommu.c
+++ b/drivers/iommu/loongarch_iommu.c
@@ -596,13 +596,14 @@ static struct iommu_domain *la_iommu_domain_alloc(unsigned int type)
 
 	switch (type) {
 	case IOMMU_DOMAIN_BLOCKED:
+	case IOMMU_DOMAIN_IDENTITY:
 	case IOMMU_DOMAIN_UNMANAGED:
 		info = alloc_dom_info();
 		if (info == NULL)
-			return NULL;
+			return ERR_PTR(-ENOMEM);
 		break;
 	default:
-		return NULL;
+		return ERR_PTR(-EINVAL);
 	}
 	return &info->domain;
 }
@@ -756,7 +757,6 @@ static void la_iommu_remove_device(struct device *dev)
 {
 	struct la_iommu_dev_data *dev_data;
 
-	iommu_group_remove_device(dev);
 	dev_data = dev->archdata.iommu;
 	dev->archdata.iommu = NULL;
 	kfree(dev_data);
@@ -846,11 +846,13 @@ static int la_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	struct iommu_info *info;
 	unsigned short bdf;
 
-	if (domain != NULL && domain->type == IOMMU_DOMAIN_BLOCKED) 
-		return 0;
-
 	la_iommu_detach_dev(dev);
 
+	if (domain != NULL &&
+		(domain->type == IOMMU_DOMAIN_IDENTITY ||
+			domain->type == IOMMU_DOMAIN_BLOCKED))
+		return 0;
+
 	if (domain == NULL)
 		return 0;
 
@@ -1186,6 +1188,11 @@ static void la_domain_set_plaform_dma_ops(struct device *dev)
 	 */
 }
 
+static int la_iommu_def_domain_type(struct device *dev)
+{
+	return IOMMU_DOMAIN_IDENTITY;
+}
+
 const struct iommu_ops la_iommu_ops = {
 	.capable = la_iommu_capable,
 	.domain_alloc = la_iommu_domain_alloc,
@@ -1193,6 +1200,7 @@ const struct iommu_ops la_iommu_ops = {
 	.release_device = la_iommu_remove_device,
 	.device_group = la_iommu_device_group,
 	.pgsize_bitmap	= LA_IOMMU_PGSIZE,
+	.def_domain_type = la_iommu_def_domain_type,
 	.owner = THIS_MODULE,
 	.set_platform_dma_ops = la_domain_set_plaform_dma_ops,
 	.default_domain_ops = &(const struct iommu_domain_ops) {