[Xen-devel] [PATCH 7/9] dom0 PCI backend: enable PV guest SR-IOV support

["Zhao, Yu" <yu.zhao@xxxxxxxxx>]

Add SR-IOV support for PV guest.

Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>

diff -r 6b4452adda52 -r 6ae4d1fd7e17 drivers/xen/pciback/conf_space_header.c
--- a/drivers/xen/pciback/conf_space_header.c   Sat Sep 27 01:28:05 2008 -0400
+++ b/drivers/xen/pciback/conf_space_header.c   Sat Sep 27 01:30:04 2008 -0400
@@ -17,6 +17,25 @@

 #define is_enable_cmd(value) ((value)&(PCI_COMMAND_MEMORY|PCI_COMMAND_IO))
 #define is_master_cmd(value) ((value)&PCI_COMMAND_MASTER)
+
+static int command_read(struct pci_dev *dev, int offset, u16 *value, void 
*data)
+{
+       int i;
+       int ret;
+
+       ret = pciback_read_config_word(dev, offset, value, data);
+       if (!dev->is_enabled)
+               return ret;
+
+       for (i = 0; i < PCI_ROM_RESOURCE; i++) {
+               if (dev->resource[i].flags & IORESOURCE_IO)
+                       *value |= PCI_COMMAND_IO;
+               if (dev->resource[i].flags & IORESOURCE_MEM)
+                       *value |= PCI_COMMAND_MEMORY;
+       }
+
+       return ret;
+}

 static int command_write(struct pci_dev *dev, int offset, u16 value, void 
*data)
 {
@@ -141,10 +160,26 @@
                                struct pci_bar_info *bar_info, int offset,
                                u32 len_mask)
 {
-       pci_read_config_dword(dev, offset, &bar_info->val);
-       pci_write_config_dword(dev, offset, len_mask);
-       pci_read_config_dword(dev, offset, &bar_info->len_val);
-       pci_write_config_dword(dev, offset, bar_info->val);
+       int     pos;
+       struct resource *res = dev->resource;
+
+       if (offset == PCI_ROM_ADDRESS || offset == PCI_ROM_ADDRESS1)
+               pos = PCI_ROM_RESOURCE;
+       else {
+               pos = (offset - PCI_BASE_ADDRESS_0) / 4;
+               if (pos && ((res[pos - 1].flags & (PCI_BASE_ADDRESS_SPACE |
+                               PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
+                          (PCI_BASE_ADDRESS_SPACE_MEMORY |
+                               PCI_BASE_ADDRESS_MEM_TYPE_64))) {
+                       bar_info->val = res[pos - 1].start >> 32;
+                       bar_info->len_val = res[pos - 1].end >> 32;
+                       return;
+               }
+       }
+
+       bar_info->val = res[pos].start |
+                       (res[pos].flags & PCI_REGION_FLAG_MASK);
+       bar_info->len_val = res[pos].end - res[pos].start + 1;
 }

 static void *bar_init(struct pci_dev *dev, int offset)
@@ -185,6 +220,22 @@
        kfree(data);
 }

+static int pciback_read_vendor(struct pci_dev *dev, int offset,
+                              u16 *value, void *data)
+{
+       *value = dev->vendor;
+
+       return 0;
+}
+
+static int pciback_read_device(struct pci_dev *dev, int offset,
+                              u16 *value, void *data)
+{
+       *value = dev->device;
+
+       return 0;
+}
+
 static int interrupt_read(struct pci_dev *dev, int offset, u8 * value,
                          void *data)
 {
@@ -212,9 +263,19 @@

 static struct config_field header_common[] = {
        {
+        .offset    = PCI_VENDOR_ID,
+        .size      = 2,
+        .u.w.read  = pciback_read_vendor,
+       },
+       {
+        .offset    = PCI_DEVICE_ID,
+        .size      = 2,
+        .u.w.read  = pciback_read_device,
+       },
+       {
         .offset    = PCI_COMMAND,
         .size      = 2,
-        .u.w.read  = pciback_read_config_word,
+        .u.w.read  = command_read,
         .u.w.write = command_write,
        },
        {

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