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Re: [PATCH v1 02/24] vfio-user: add VFIO base abstract class

From: Cédric Le Goater
Subject: Re: [PATCH v1 02/24] vfio-user: add VFIO base abstract class
Date: Fri, 9 Dec 2022 17:04:25 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.1 
Hello John,

On 11/9/22 00:13, John Johnson wrote:

Add an abstract base class both the kernel driver
and user socket implementations can use to share code.

Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>


I would help the reader if the header files came first. You could use :

  [diff]
        orderFile = /path/to/qemu/scripts/git.orderfile


I would simply use 'Kernel' instead of 'Kern' in the type definition.
A part from that,

Reviewed-by: Cédric Le Goater <clg@redhat.com>

Thanks,

C.


---
  hw/vfio/pci.c | 106 +++++++++++++++++++++++++++++++++++-----------------------
  hw/vfio/pci.h |  16 +++++++--
  2 files changed, 78 insertions(+), 44 deletions(-)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 939dcc3..60acde5 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -235,7 +235,7 @@ static void vfio_intx_update(VFIOPCIDevice *vdev, 
PCIINTxRoute *route)
static void vfio_intx_routing_notifier(PCIDevice *pdev) 
  {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
      PCIINTxRoute route;
if (vdev->interrupt != VFIO_INT_INTx) { 
@@ -467,7 +467,7 @@ static void vfio_update_kvm_msi_virq(VFIOMSIVector *vector, 
MSIMessage msg,
  static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr,
                                     MSIMessage *msg, IOHandler *handler)
  {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
      VFIOMSIVector *vector;
      int ret;
@@ -561,7 +561,7 @@ static int vfio_msix_vector_use(PCIDevice *pdev, static void vfio_msix_vector_release(PCIDevice *pdev, unsigned int nr) 
  {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
      VFIOMSIVector *vector = &vdev->msi_vectors[nr];
trace_vfio_msix_vector_release(vdev->vbasedev.name, nr); 
@@ -1109,7 +1109,7 @@ static const MemoryRegionOps vfio_vga_ops = {
   */
  static void vfio_sub_page_bar_update_mapping(PCIDevice *pdev, int bar)
  {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
      VFIORegion *region = &vdev->bars[bar].region;
      MemoryRegion *mmap_mr, *region_mr, *base_mr;
      PCIIORegion *r;
@@ -1155,7 +1155,7 @@ static void vfio_sub_page_bar_update_mapping(PCIDevice 
*pdev, int bar)
   */
  uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len)
  {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
      uint32_t emu_bits = 0, emu_val = 0, phys_val = 0, val;
memcpy(&emu_bits, vdev->emulated_config_bits + addr, len); 
@@ -1188,7 +1188,7 @@ uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t 
addr, int len)
  void vfio_pci_write_config(PCIDevice *pdev,
                             uint32_t addr, uint32_t val, int len)
  {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
      uint32_t val_le = cpu_to_le32(val);
trace_vfio_pci_write_config(vdev->vbasedev.name, addr, val, len); 
@@ -2845,7 +2845,7 @@ static void vfio_unregister_req_notifier(VFIOPCIDevice 
*vdev)
static void vfio_realize(PCIDevice *pdev, Error **errp) 
  {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
      VFIODevice *vbasedev = &vdev->vbasedev;
      VFIODevice *vbasedev_iter;
      VFIOGroup *group;
@@ -3169,7 +3169,7 @@ error:
static void vfio_instance_finalize(Object *obj) 
  {
-    VFIOPCIDevice *vdev = VFIO_PCI(obj);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(obj);
      VFIOGroup *group = vdev->vbasedev.group;
vfio_display_finalize(vdev); 
@@ -3189,7 +3189,7 @@ static void vfio_instance_finalize(Object *obj)
static void vfio_exitfn(PCIDevice *pdev) 
  {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
vfio_unregister_req_notifier(vdev); 
      vfio_unregister_err_notifier(vdev);
@@ -3208,7 +3208,7 @@ static void vfio_exitfn(PCIDevice *pdev)
static void vfio_pci_reset(DeviceState *dev) 
  {
-    VFIOPCIDevice *vdev = VFIO_PCI(dev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(dev);
trace_vfio_pci_reset(vdev->vbasedev.name); @@ -3248,7 +3248,7 @@ post_reset: 
  static void vfio_instance_init(Object *obj)
  {
      PCIDevice *pci_dev = PCI_DEVICE(obj);
-    VFIOPCIDevice *vdev = VFIO_PCI(obj);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(obj);
device_add_bootindex_property(obj, &vdev->bootindex, 
                                    "bootindex", NULL,
@@ -3265,24 +3265,12 @@ static void vfio_instance_init(Object *obj)
      pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
  }
-static Property vfio_pci_dev_properties[] = { 
-    DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIOPCIDevice, host),
-    DEFINE_PROP_STRING("sysfsdev", VFIOPCIDevice, vbasedev.sysfsdev),
+static Property vfio_pci_base_dev_properties[] = {
      DEFINE_PROP_ON_OFF_AUTO("x-pre-copy-dirty-page-tracking", VFIOPCIDevice,
                              vbasedev.pre_copy_dirty_page_tracking,
                              ON_OFF_AUTO_ON),
-    DEFINE_PROP_ON_OFF_AUTO("display", VFIOPCIDevice,
-                            display, ON_OFF_AUTO_OFF),
-    DEFINE_PROP_UINT32("xres", VFIOPCIDevice, display_xres, 0),
-    DEFINE_PROP_UINT32("yres", VFIOPCIDevice, display_yres, 0),
      DEFINE_PROP_UINT32("x-intx-mmap-timeout-ms", VFIOPCIDevice,
                         intx.mmap_timeout, 1100),
-    DEFINE_PROP_BIT("x-vga", VFIOPCIDevice, features,
-                    VFIO_FEATURE_ENABLE_VGA_BIT, false),
-    DEFINE_PROP_BIT("x-req", VFIOPCIDevice, features,
-                    VFIO_FEATURE_ENABLE_REQ_BIT, true),
-    DEFINE_PROP_BIT("x-igd-opregion", VFIOPCIDevice, features,
-                    VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT, false),
      DEFINE_PROP_BOOL("x-enable-migration", VFIOPCIDevice,
                       vbasedev.enable_migration, false),
      DEFINE_PROP_BOOL("x-no-mmap", VFIOPCIDevice, vbasedev.no_mmap, false),
@@ -3291,8 +3279,6 @@ static Property vfio_pci_dev_properties[] = {
      DEFINE_PROP_BOOL("x-no-kvm-intx", VFIOPCIDevice, no_kvm_intx, false),
      DEFINE_PROP_BOOL("x-no-kvm-msi", VFIOPCIDevice, no_kvm_msi, false),
      DEFINE_PROP_BOOL("x-no-kvm-msix", VFIOPCIDevice, no_kvm_msix, false),
-    DEFINE_PROP_BOOL("x-no-geforce-quirks", VFIOPCIDevice,
-                     no_geforce_quirks, false),
      DEFINE_PROP_BOOL("x-no-kvm-ioeventfd", VFIOPCIDevice, no_kvm_ioeventfd,
                       false),
      DEFINE_PROP_BOOL("x-no-vfio-ioeventfd", VFIOPCIDevice, no_vfio_ioeventfd,
@@ -3303,10 +3289,6 @@ static Property vfio_pci_dev_properties[] = {
                         sub_vendor_id, PCI_ANY_ID),
      DEFINE_PROP_UINT32("x-pci-sub-device-id", VFIOPCIDevice,
                         sub_device_id, PCI_ANY_ID),
-    DEFINE_PROP_UINT32("x-igd-gms", VFIOPCIDevice, igd_gms, 0),
-    DEFINE_PROP_UNSIGNED_NODEFAULT("x-nv-gpudirect-clique", VFIOPCIDevice,
-                                   nv_gpudirect_clique,
-                                   qdev_prop_nv_gpudirect_clique, uint8_t),
      DEFINE_PROP_OFF_AUTO_PCIBAR("x-msix-relocation", VFIOPCIDevice, msix_relo,
                                  OFF_AUTOPCIBAR_OFF),
      /*
@@ -3317,28 +3299,25 @@ static Property vfio_pci_dev_properties[] = {
      DEFINE_PROP_END_OF_LIST(),
  };
-static void vfio_pci_dev_class_init(ObjectClass *klass, void *data) 
+static void vfio_pci_base_dev_class_init(ObjectClass *klass, void *data)
  {
      DeviceClass *dc = DEVICE_CLASS(klass);
      PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass);
- dc->reset = vfio_pci_reset; 
-    device_class_set_props(dc, vfio_pci_dev_properties);
-    dc->desc = "VFIO-based PCI device assignment";
+    device_class_set_props(dc, vfio_pci_base_dev_properties);
+    dc->desc = "VFIO PCI base device";
      set_bit(DEVICE_CATEGORY_MISC, dc->categories);
-    pdc->realize = vfio_realize;
      pdc->exit = vfio_exitfn;
      pdc->config_read = vfio_pci_read_config;
      pdc->config_write = vfio_pci_write_config;
  }
-static const TypeInfo vfio_pci_dev_info = { 
-    .name = TYPE_VFIO_PCI,
+static const TypeInfo vfio_pci_base_dev_info = {
+    .name = TYPE_VFIO_PCI_BASE,
      .parent = TYPE_PCI_DEVICE,
-    .instance_size = sizeof(VFIOPCIDevice),
-    .class_init = vfio_pci_dev_class_init,
-    .instance_init = vfio_instance_init,
-    .instance_finalize = vfio_instance_finalize,
+    .instance_size = 0,
+    .abstract = true,
+    .class_init = vfio_pci_base_dev_class_init,
      .interfaces = (InterfaceInfo[]) {
          { INTERFACE_PCIE_DEVICE },
          { INTERFACE_CONVENTIONAL_PCI_DEVICE },
@@ -3346,6 +3325,48 @@ static const TypeInfo vfio_pci_dev_info = {
      },
  };
+static Property vfio_pci_dev_properties[] = { 
+    DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIOPCIDevice, host),
+    DEFINE_PROP_STRING("sysfsdev", VFIOPCIDevice, vbasedev.sysfsdev),
+    DEFINE_PROP_ON_OFF_AUTO("display", VFIOPCIDevice,
+                            display, ON_OFF_AUTO_OFF),
+    DEFINE_PROP_UINT32("xres", VFIOPCIDevice, display_xres, 0),
+    DEFINE_PROP_UINT32("yres", VFIOPCIDevice, display_yres, 0),
+    DEFINE_PROP_BIT("x-vga", VFIOPCIDevice, features,
+                    VFIO_FEATURE_ENABLE_VGA_BIT, false),
+    DEFINE_PROP_BIT("x-req", VFIOPCIDevice, features,
+                    VFIO_FEATURE_ENABLE_REQ_BIT, true),
+    DEFINE_PROP_BIT("x-igd-opregion", VFIOPCIDevice, features,
+                    VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT, false),
+    DEFINE_PROP_BOOL("x-no-geforce-quirks", VFIOPCIDevice,
+                     no_geforce_quirks, false),
+    DEFINE_PROP_UINT32("x-igd-gms", VFIOPCIDevice, igd_gms, 0),
+    DEFINE_PROP_UNSIGNED_NODEFAULT("x-nv-gpudirect-clique", VFIOPCIDevice,
+                                   nv_gpudirect_clique,
+                                   qdev_prop_nv_gpudirect_clique, uint8_t),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass);
+
+    dc->reset = vfio_pci_reset;
+    device_class_set_props(dc, vfio_pci_dev_properties);
+    dc->desc = "VFIO-based PCI device assignment";
+    pdc->realize = vfio_realize;
+}
+
+static const TypeInfo vfio_pci_dev_info = {
+    .name = TYPE_VFIO_PCI,
+    .parent = TYPE_VFIO_PCI_BASE,
+    .instance_size = sizeof(VFIOKernPCIDevice),
+    .class_init = vfio_pci_dev_class_init,
+    .instance_init = vfio_instance_init,
+    .instance_finalize = vfio_instance_finalize,
+};
+
  static Property vfio_pci_dev_nohotplug_properties[] = {
      DEFINE_PROP_BOOL("ramfb", VFIOPCIDevice, enable_ramfb, false),
      DEFINE_PROP_END_OF_LIST(),
@@ -3362,12 +3383,13 @@ static void 
vfio_pci_nohotplug_dev_class_init(ObjectClass *klass, void *data)
  static const TypeInfo vfio_pci_nohotplug_dev_info = {
      .name = TYPE_VFIO_PCI_NOHOTPLUG,
      .parent = TYPE_VFIO_PCI,
-    .instance_size = sizeof(VFIOPCIDevice),
+    .instance_size = sizeof(VFIOKernPCIDevice),
      .class_init = vfio_pci_nohotplug_dev_class_init,
  };
static void register_vfio_pci_dev_type(void) 
  {
+    type_register_static(&vfio_pci_base_dev_info);
      type_register_static(&vfio_pci_dev_info);
      type_register_static(&vfio_pci_nohotplug_dev_info);
  }
diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
index 7c236a5..7c5c8ec 100644
--- a/hw/vfio/pci.h
+++ b/hw/vfio/pci.h
@@ -115,8 +115,13 @@ typedef struct VFIOMSIXInfo {
      unsigned long *pending;
  } VFIOMSIXInfo;
-#define TYPE_VFIO_PCI "vfio-pci" 
-OBJECT_DECLARE_SIMPLE_TYPE(VFIOPCIDevice, VFIO_PCI)
+/*
+ * TYPE_VFIO_PCI_BASE is an abstract type used to share code
+ * between VFIO implementations that use a kernel driver
+ * with those that use user sockets.
+ */
+#define TYPE_VFIO_PCI_BASE "vfio-pci-base"
+OBJECT_DECLARE_SIMPLE_TYPE(VFIOPCIDevice, VFIO_PCI_BASE)
struct VFIOPCIDevice { 
      PCIDevice pdev;
@@ -177,6 +182,13 @@ struct VFIOPCIDevice {
      Notifier irqchip_change_notifier;
  };
+#define TYPE_VFIO_PCI "vfio-pci" 
+OBJECT_DECLARE_SIMPLE_TYPE(VFIOKernPCIDevice, VFIO_PCI)
+
+struct VFIOKernPCIDevice {
+    VFIOPCIDevice device;
+};
+
  /* Use uin32_t for vendor & device so PCI_ANY_ID expands and cannot match hw 
*/
  static inline bool vfio_pci_is(VFIOPCIDevice *vdev, uint32_t vendor, uint32_t 
device)
  {
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