MSI-X mask support for assigned device on userspace

index 733d0a9..fbb68f6 100644
@@ -540,6 +540,22 @@ int kvm_set_xcrs(CPUState *env, struct kvm_xcrs *xcrs)
 }
 #endif
 
+#ifdef KVM_CAP_ENABLE_CAP
+int kvm_enable_cap(CPUState *env, uint32_t cap)
+{
+    int r = 0;
+    struct kvm_enable_cap enable_cap = {
+        .cap = cap,
+        .flags = 0,
+    };
+
+    r = kvm_ioctl(kvm_state, KVM_CHECK_EXTENSION, KVM_CAP_ENABLE_CAP);
+    if (r > 0)
+	    r = kvm_vcpu_ioctl(env, KVM_ENABLE_CAP, &enable_cap);
+    return r;
+}
+#endif
+
 static int handle_mmio(CPUState *env)
 {
     unsigned long addr = env->kvm_run->mmio.phys_addr;

index 9c08ab4..5cac0c2 100644
@@ -316,6 +316,14 @@ int kvm_get_xcrs(CPUState *env, struct kvm_xcrs *xcrs);
 int kvm_set_xcrs(CPUState *env, struct kvm_xcrs *xcrs);
 #endif
 
+#ifdef KVM_ENABLE_CAP
+/*!
+ *  * \brief Enable specific capability of KVM
+ *
+ */
+int kvm_enable_cap(CPUState *env, uint32_t cap);
+#endif
+
 /*!
  * \brief Simulate an external vectored interrupt
  *

index fbb68f6..bb817d6 100644
@@ -1108,6 +1108,15 @@ int kvm_assign_set_msix_entry(kvm_context_t kvm,
 {
     return kvm_vm_ioctl(kvm_state, KVM_ASSIGN_SET_MSIX_ENTRY, entry);
 }
+
+#ifdef KVM_CAP_DEVICE_MSIX_MASK
+int kvm_assign_reg_msix_mmio(kvm_context_t kvm,
+                           struct kvm_assigned_msix_mmio *msix_mmio)
+{
+    return kvm_vm_ioctl(kvm_state, KVM_ASSIGN_REG_MSIX_MMIO, msix_mmio);
+}
+#endif
+
 #endif
 
 #if defined(KVM_CAP_IRQFD) && defined(CONFIG_EVENTFD)

index 5cac0c2..ff8ca00 100644
@@ -751,6 +751,10 @@ int kvm_assign_set_msix_nr(kvm_context_t kvm,
                            struct kvm_assigned_msix_nr *msix_nr);
 int kvm_assign_set_msix_entry(kvm_context_t kvm,
                               struct kvm_assigned_msix_entry *entry);
+#ifdef KVM_CAP_DEVICE_MSIX_MASK
+int kvm_assign_reg_msix_mmio(kvm_context_t kvm,
+                           struct kvm_assigned_msix_mmio *msix_mmio);
+#endif
 #endif
 
 #else                           /* !CONFIG_KVM */

index 2605bd1..8a98876 100644
@@ -1106,15 +1106,10 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev, unsigned int ctrl_pos)
 #endif
 
 #ifdef KVM_CAP_DEVICE_MSIX
-static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
+static int get_msix_entries_max_nr(AssignedDevice *adev)
 {
-    AssignedDevice *adev = container_of(pci_dev, AssignedDevice, dev);
-    uint16_t entries_nr = 0, entries_max_nr;
-    int pos = 0, i, r = 0;
-    uint32_t msg_addr, msg_upper_addr, msg_data, msg_ctrl;
-    struct kvm_assigned_msix_nr msix_nr;
-    struct kvm_assigned_msix_entry msix_entry;
-    void *va = adev->msix_table_page;
+    int pos, entries_max_nr;
+    PCIDevice *pci_dev = &adev->dev;
 
     if (adev->cap.available & ASSIGNED_DEVICE_CAP_MSI)
         pos = pci_dev->cap.start + PCI_CAPABILITY_CONFIG_MSI_LENGTH;

@@ -1125,6 +1120,17 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
     entries_max_nr &= PCI_MSIX_TABSIZE;
     entries_max_nr += 1;
 
+    return entries_max_nr;
+}
+
+static int get_msix_valid_entries_nr(AssignedDevice *adev,
+				     uint16_t entries_max_nr)
+{
+    void *va = adev->msix_table_page;
+    uint32_t msg_data, msg_ctrl;
+    uint16_t entries_nr = 0;
+    int i;
+
     /* Get the usable entry number for allocating */
     for (i = 0; i < entries_max_nr; i++) {
         memcpy(&msg_ctrl, va + i * 16 + 12, 4);

@@ -1134,11 +1140,20 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
             continue;
         entries_nr ++;
     }
+    return entries_nr;
+}
+
+static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev,
+                                         uint16_t entries_nr,
+                                         uint16_t entries_max_nr)
+{
+    AssignedDevice *adev = container_of(pci_dev, AssignedDevice, dev);
+    int i, r = 0;
+    uint32_t msg_addr, msg_upper_addr, msg_data, msg_ctrl;
+    struct kvm_assigned_msix_nr msix_nr;
+    struct kvm_assigned_msix_entry msix_entry;
+    void *va = adev->msix_table_page;
 
-    if (entries_nr == 0) {
-        fprintf(stderr, "MSI-X entry number is zero!\n");
-        return -EINVAL;
-    }
     msix_nr.assigned_dev_id = calc_assigned_dev_id(adev->h_segnr, adev->h_busnr,
                                           (uint8_t)adev->h_devfn);
     msix_nr.entry_nr = entries_nr;

@@ -1180,8 +1195,8 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
         adev->entry[entries_nr].u.msi.address_lo = msg_addr;
         adev->entry[entries_nr].u.msi.address_hi = msg_upper_addr;
         adev->entry[entries_nr].u.msi.data = msg_data;
-        DEBUG("MSI-X data 0x%x, MSI-X addr_lo 0x%x\n!", msg_data, msg_addr);
-	kvm_add_routing_entry(&adev->entry[entries_nr]);
+        DEBUG("MSI-X data 0x%x, MSI-X addr_lo 0x%x!\n", msg_data, msg_addr);
+        kvm_add_routing_entry(&adev->entry[entries_nr]);
 
         msix_entry.gsi = adev->entry[entries_nr].gsi;
         msix_entry.entry = i;

@@ -1190,7 +1205,7 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
             fprintf(stderr, "fail to set MSI-X entry! %s\n", strerror(-r));
             break;
         }
-        DEBUG("MSI-X entry gsi 0x%x, entry %d\n!",
+        DEBUG("MSI-X entry gsi 0x%x, entry %d!\n",
                 msix_entry.gsi, msix_entry.entry);
         entries_nr ++;
     }

@@ -1203,12 +1218,12 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
     return r;
 }
 
-static void assigned_dev_update_msix(PCIDevice *pci_dev, unsigned int ctrl_pos)
+static void assigned_dev_update_msix(PCIDevice *pci_dev, int enable_msix)
 {
     struct kvm_assigned_irq assigned_irq_data;
     AssignedDevice *assigned_dev = container_of(pci_dev, AssignedDevice, dev);
-    uint16_t *ctrl_word = (uint16_t *)(pci_dev->config + ctrl_pos);
     int r;
+    uint16_t entries_nr, entries_max_nr;
 
     memset(&assigned_irq_data, 0, sizeof assigned_irq_data);
     assigned_irq_data.assigned_dev_id  =

@@ -1219,8 +1234,7 @@ static void assigned_dev_update_msix(PCIDevice *pci_dev, unsigned int ctrl_pos)
      * try to catch this by only deassigning irqs if the guest is using
      * MSIX or intends to start. */
     if ((assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MSIX) ||
-        (*ctrl_word & PCI_MSIX_ENABLE)) {
-
+            enable_msix) {
         assigned_irq_data.flags = assigned_dev->irq_requested_type;
         free_dev_irq_entries(assigned_dev);
         r = kvm_deassign_irq(kvm_context, &assigned_irq_data);

@@ -1231,14 +1245,25 @@ static void assigned_dev_update_msix(PCIDevice *pci_dev, unsigned int ctrl_pos)
         assigned_dev->irq_requested_type = 0;
     }
 
-    if (*ctrl_word & PCI_MSIX_ENABLE) {
-        assigned_irq_data.flags = KVM_DEV_IRQ_HOST_MSIX |
-                                  KVM_DEV_IRQ_GUEST_MSIX;
-
-        if (assigned_dev_update_msix_mmio(pci_dev) < 0) {
+    entries_max_nr = get_msix_entries_max_nr(assigned_dev);
+    if (entries_max_nr == 0) {
+        fprintf(stderr, "assigned_dev_update_msix: MSI-X entries_max_nr == 0");
+        return;
+    }
+    entries_nr = get_msix_valid_entries_nr(assigned_dev, entries_max_nr);
+    if (entries_nr == 0) {
+        if (enable_msix)
+            fprintf(stderr, "MSI-X entry number is zero!\n");
+        return;
+    }
+    if (enable_msix) {
+        if (assigned_dev_update_msix_mmio(pci_dev,
+                    entries_nr, entries_max_nr) < 0) {
             perror("assigned_dev_update_msix_mmio");
             return;
         }
+        assigned_irq_data.flags = KVM_DEV_IRQ_HOST_MSIX |
+                                  KVM_DEV_IRQ_GUEST_MSIX;
         if (kvm_assign_irq(kvm_context, &assigned_irq_data) < 0) {
             perror("assigned_dev_enable_msix: assign irq");
             return;

@@ -1254,6 +1279,7 @@ static void assigned_device_pci_cap_write_config(PCIDevice *pci_dev, uint32_t ad
 {
     AssignedDevice *assigned_dev = container_of(pci_dev, AssignedDevice, dev);
     unsigned int pos = pci_dev->cap.start, ctrl_pos;
+    uint16_t *ctrl_word;
 
     pci_default_cap_write_config(pci_dev, address, val, len);
 #ifdef KVM_CAP_IRQ_ROUTING

@@ -1270,7 +1296,8 @@ static void assigned_device_pci_cap_write_config(PCIDevice *pci_dev, uint32_t ad
         ctrl_pos = pos + 3;
         if (address <= ctrl_pos && address + len > ctrl_pos) {
             ctrl_pos--; /* control is word long */
-            assigned_dev_update_msix(pci_dev, ctrl_pos);
+            ctrl_word = (uint16_t *)(pci_dev->config + ctrl_pos);
+            assigned_dev_update_msix(pci_dev, (*ctrl_word & PCI_MSIX_ENABLE));
 	}
         pos += PCI_CAPABILITY_CONFIG_MSIX_LENGTH;
     }

index 8a98876..d1a6282 100644
@@ -62,6 +62,11 @@ static void assigned_dev_load_option_rom(AssignedDevice *dev);
 
 static void assigned_dev_unregister_msix_mmio(AssignedDevice *dev);
 
+static uint32_t calc_assigned_dev_id(uint16_t seg, uint8_t bus, uint8_t devfn)
+{
+    return (uint32_t)seg << 16 | (uint32_t)bus << 8 | (uint32_t)devfn;
+}
+
 static uint32_t assigned_dev_ioport_rw(AssignedDevRegion *dev_region,
                                        uint32_t addr, int len, uint32_t *val)
 {

@@ -824,11 +829,6 @@ static void free_assigned_device(AssignedDevice *dev)
     }
 }
 
-static uint32_t calc_assigned_dev_id(uint16_t seg, uint8_t bus, uint8_t devfn)
-{
-    return (uint32_t)seg << 16 | (uint32_t)bus << 8 | (uint32_t)devfn;
-}
-
 static void assign_failed_examine(AssignedDevice *dev)
 {
     char name[PATH_MAX], dir[PATH_MAX], driver[PATH_MAX] = {}, *ns;

@@ -1123,6 +1123,7 @@ static int get_msix_entries_max_nr(AssignedDevice *adev)
     return entries_max_nr;
 }
 
+#define MSIX_VECTOR_MASK 0x1
 static int get_msix_valid_entries_nr(AssignedDevice *adev,
 				     uint16_t entries_max_nr)
 {

@@ -1136,7 +1137,11 @@ static int get_msix_valid_entries_nr(AssignedDevice *adev,
         memcpy(&msg_ctrl, va + i * 16 + 12, 4);
         memcpy(&msg_data, va + i * 16 + 8, 4);
         /* Ignore unused entry even it's unmasked */
+#ifdef KVM_CAP_DEVICE_MSIX_MASK
+        if (msg_data == 0 || (msg_ctrl & MSIX_VECTOR_MASK))
+#else
         if (msg_data == 0)
+#endif
             continue;
         entries_nr ++;
     }

@@ -1165,6 +1170,8 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev,
     }
 
     free_dev_irq_entries(adev);
+    memset(pci_dev->msix_entry_used, 0, KVM_MAX_MSIX_PER_DEV *
+                                        sizeof(*pci_dev->msix_entry_used));
     adev->irq_entries_nr = entries_nr;
     adev->entry = calloc(entries_nr, sizeof(struct kvm_irq_routing_entry));
     if (!adev->entry) {

@@ -1179,7 +1186,11 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev,
             break;
         memcpy(&msg_ctrl, va + i * 16 + 12, 4);
         memcpy(&msg_data, va + i * 16 + 8, 4);
+#ifdef KVM_CAP_DEVICE_MSIX_MASK
+        if (msg_data == 0 || (msg_ctrl & MSIX_VECTOR_MASK))
+#else
         if (msg_data == 0)
+#endif
             continue;
 
         memcpy(&msg_addr, va + i * 16, 4);

@@ -1200,6 +1211,7 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev,
 
         msix_entry.gsi = adev->entry[entries_nr].gsi;
         msix_entry.entry = i;
+        pci_dev->msix_entry_used[i] = 1;
         r = kvm_assign_set_msix_entry(kvm_context, &msix_entry);
         if (r) {
             fprintf(stderr, "fail to set MSI-X entry! %s\n", strerror(-r));

@@ -1243,6 +1255,8 @@ static void assigned_dev_update_msix(PCIDevice *pci_dev, int enable_msix)
             perror("assigned_dev_update_msix: deassign irq");
 
         assigned_dev->irq_requested_type = 0;
+        memset(pci_dev->msix_entry_used, 0, KVM_MAX_MSIX_PER_DEV *
+                                        sizeof(*pci_dev->msix_entry_used));
     }
 
     entries_max_nr = get_msix_entries_max_nr(assigned_dev);

@@ -1250,10 +1264,16 @@ static void assigned_dev_update_msix(PCIDevice *pci_dev, int enable_msix)
         fprintf(stderr, "assigned_dev_update_msix: MSI-X entries_max_nr == 0");
         return;
     }
+    /*
+     * Guest may try to enable MSI-X before setting MSI-X entry done, so
+     * let's wait until guest unmask the entries.
+     */
     entries_nr = get_msix_valid_entries_nr(assigned_dev, entries_max_nr);
     if (entries_nr == 0) {
+#ifndef KVM_CAP_DEVICE_MSIX_MASK
         if (enable_msix)
             fprintf(stderr, "MSI-X entry number is zero!\n");
+#endif
         return;
     }
     if (enable_msix) {

@@ -1297,7 +1317,8 @@ static void assigned_device_pci_cap_write_config(PCIDevice *pci_dev, uint32_t ad
         if (address <= ctrl_pos && address + len > ctrl_pos) {
             ctrl_pos--; /* control is word long */
             ctrl_word = (uint16_t *)(pci_dev->config + ctrl_pos);
-            assigned_dev_update_msix(pci_dev, (*ctrl_word & PCI_MSIX_ENABLE));
+            assigned_dev_update_msix(pci_dev,
+                    (*ctrl_word & PCI_MSIX_ENABLE) && !(*ctrl_word & PCI_MSIX_MASK));
 	}
         pos += PCI_CAPABILITY_CONFIG_MSIX_LENGTH;
     }

@@ -1389,6 +1410,104 @@ static uint32_t msix_mmio_readw(void *opaque, target_phys_addr_t addr)
             (8 * (addr & 3))) & 0xffff;
 }
 
+#ifdef KVM_CAP_DEVICE_MSIX_MASK
+static void msix_mmio_access_mask_bit(AssignedDevice *adev, int index)
+{
+    void *page = adev->msix_table_page;
+    uint32_t msg_ctrl, msg_data, msg_upper_addr, msg_addr;
+    struct kvm_assigned_msix_entry msix_entry;
+    int r = 0, pos, ctrl_word, entry_idx, entries_max_nr;
+    struct kvm_irq_routing_entry new_entry = {};
+
+    memcpy(&msg_addr, (char *)page + index * 16, 4);
+    memcpy(&msg_upper_addr, (char *)page + index * 16 + 4, 4);
+    memcpy(&msg_data, (char *)page + index * 16 + 8, 4);
+    memcpy(&msg_ctrl, (char *)page + index * 16 + 12, 4);
+    DEBUG("Access mask bit: MSI-X entries index %d: "
+            "msg_addr 0x%x, msg_upper_addr 0x%x, msg_data 0x%x, vec_ctl 0x%x\n",
+            index, msg_addr, msg_upper_addr, msg_data, msg_ctrl);
+
+    if (adev->cap.available & ASSIGNED_DEVICE_CAP_MSI)
+        pos = adev->dev.cap.start + PCI_CAPABILITY_CONFIG_MSI_LENGTH;
+    else
+        pos = adev->dev.cap.start;
+
+    ctrl_word = *(uint16_t *)(adev->dev.config + pos + 2);
+
+    if (!((ctrl_word & PCI_MSIX_ENABLE) && !(ctrl_word & PCI_MSIX_MASK)))
+        return;
+
+    if (!adev->dev.msix_entry_used[index]) {
+        if ((msg_ctrl & MSIX_VECTOR_MASK) == 0) {
+            DEBUG("Try to modify unenabled MSI-X entry %d's mask. "
+                    "Reenable MSI-X.\n",
+                    index);
+            assigned_dev_update_msix(&adev->dev, 1);
+        }
+        return;
+    }
+
+    /* find the correlated index of adev->entry */
+    entries_max_nr = get_msix_entries_max_nr(adev);
+    entry_idx = 0;
+    while (entry_idx < entries_max_nr) {
+        if (adev->dev.msix_entry_used[entry_idx] && entry_idx == index)
+                break;
+	entry_idx ++;
+    }
+    if (entry_idx >= entries_max_nr) {
+        fprintf(stderr, "msix_mmio_access_mask_bit: Entry idx exceed limit!\n");
+        return;
+    }
+
+    msix_entry.assigned_dev_id = calc_assigned_dev_id(adev->h_segnr,
+            adev->h_busnr,
+            (uint8_t)adev->h_devfn);
+    msix_entry.gsi = adev->entry[entry_idx].gsi;
+    msix_entry.entry = index;
+    if (msg_ctrl & MSIX_VECTOR_MASK)
+        msix_entry.flags = KVM_MSIX_FLAG_MASK;
+    else
+        msix_entry.flags = 0;
+    DEBUG("set MSI-X index %d, esi 0x%x, mask %d\n",
+            index, msix_entry.gsi, msix_entry.flags);
+    r = kvm_assign_set_msix_entry(kvm_context, &msix_entry);
+    if (r) {
+        perror("msix_mmio_access_mask_bit: "
+                "fail to set MSI-X entry!");
+        return;
+    }
+
+    if (msix_entry.flags == 0) {
+        new_entry.gsi = adev->entry[entry_idx].gsi;
+        new_entry.type = KVM_IRQ_ROUTING_MSI;
+        new_entry.flags = 0;
+        new_entry.u.msi.address_lo = msg_addr;
+        new_entry.u.msi.address_hi = msg_upper_addr;
+        new_entry.u.msi.data = msg_data;
+        if (memcmp(&adev->entry[entry_idx].u.msi, &new_entry.u.msi,
+                    sizeof new_entry.u.msi)) {
+            int r;
+            r = kvm_update_routing_entry(&adev->entry[entry_idx], &new_entry);
+            if (r) {
+                perror("msix_mmio_access_mask_bit: "
+                        "kvm_update_routing_entry failed\n");
+                return;
+            }
+            r = kvm_commit_irq_routes();
+            if (r) {
+                perror("msix_mmio_access_mask_bit: "
+                        "kvm_commit_irq_routes failed\n");
+                return;
+            }
+        }
+        adev->entry[entry_idx].u.msi.address_lo = msg_addr;
+        adev->entry[entry_idx].u.msi.address_hi = msg_upper_addr;
+        adev->entry[entry_idx].u.msi.data = msg_data;
+    }
+}
+#endif
+
 static void msix_mmio_writel(void *opaque,
                              target_phys_addr_t addr, uint32_t val)
 {

@@ -1399,6 +1518,12 @@ static void msix_mmio_writel(void *opaque,
     DEBUG("write to MSI-X entry table mmio offset 0x%lx, val 0x%x\n",
 		    addr, val);
     memcpy((void *)((char *)page + offset), &val, 4);
+
+#ifdef KVM_CAP_DEVICE_MSIX_MASK
+    /* Check if mask bit is being accessed */
+    if (offset % 16 == 12)
+	    msix_mmio_access_mask_bit(adev, offset / 16);
+#endif
 }
 
 static void msix_mmio_writew(void *opaque,

@@ -1425,6 +1550,16 @@ static CPUReadMemoryFunc *msix_mmio_read[] = {
 
 static int assigned_dev_register_msix_mmio(AssignedDevice *dev)
 {
+#ifdef KVM_CAP_DEVICE_MSIX_MASK
+#ifndef KVM_CAP_DEVICE_MSIX_EXT
+#error
+#endif
+    /* Request for MSI-X masking support */
+    if (kvm_enable_cap(first_cpu, KVM_CAP_DEVICE_MSIX_EXT) != 0) {
+        fprintf(stderr, "fail to enable MSI-X extending support!\n");
+        return -EFAULT;
+    }
+#endif
     dev->msix_table_page = mmap(NULL, 0x1000,
                                 PROT_READ|PROT_WRITE,
                                 MAP_ANONYMOUS|MAP_PRIVATE, 0, 0);

@@ -1436,6 +1571,8 @@ static int assigned_dev_register_msix_mmio(AssignedDevice *dev)
     memset(dev->msix_table_page, 0, 0x1000);
     dev->mmio_index = cpu_register_io_memory(
                         msix_mmio_read, msix_mmio_write, dev);
+    dev->dev.msix_entry_used = qemu_mallocz(KVM_MAX_MSIX_PER_DEV *
+                                        sizeof *dev->dev.msix_entry_used);
     return 0;
 }
 

@@ -1452,6 +1589,8 @@ static void assigned_dev_unregister_msix_mmio(AssignedDevice *dev)
                 strerror(errno));
     }
     dev->msix_table_page = NULL;
+    free(dev->dev.msix_entry_used);
+    dev->dev.msix_entry_used = NULL;
 }
 
 static int assigned_initfn(struct PCIDevice *pci_dev)

index d1a6282..aa3358e 100644
@@ -269,6 +269,9 @@ static void assigned_dev_iomem_map(PCIDevice *pci_dev, int region_num,
     AssignedDevRegion *region = &r_dev->v_addrs[region_num];
     PCIRegion *real_region = &r_dev->real_device.regions[region_num];
     int ret = 0;
+#ifdef KVM_CAP_DEVICE_MSIX_MASK
+    struct kvm_assigned_msix_mmio msix_mmio;
+#endif
 
     DEBUG("e_phys=%08" FMT_PCIBUS " r_virt=%p type=%d len=%08" FMT_PCIBUS " region_num=%d \n",
           e_phys, region->u.r_virtbase, type, e_size, region_num);

@@ -287,6 +290,16 @@ static void assigned_dev_iomem_map(PCIDevice *pci_dev, int region_num,
 
             cpu_register_physical_memory(e_phys + offset,
                     TARGET_PAGE_SIZE, r_dev->mmio_index);
+#ifdef KVM_CAP_DEVICE_MSIX_MASK
+	    memset(&msix_mmio, 0, sizeof(struct kvm_assigned_msix_mmio));
+	    msix_mmio.assigned_dev_id = calc_assigned_dev_id(r_dev->h_segnr,
+			    r_dev->h_busnr, r_dev->h_devfn);
+	    msix_mmio.base_addr = e_phys + offset;
+	    if (kvm_assign_reg_msix_mmio(kvm_context, &msix_mmio))
+                fprintf(stderr, "fail to register in-kernel msix_mmio!\n");
+            /* We can still continue because the MMIO accessing can fall
+             * back to QEmu */
+#endif
         }
     }