[PATCH 05/12] hw/virtio: Add support for apple virtio-blk

[Alexander Graf <graf@amazon.com>]

Apple has its own virtio-blk PCI device ID where it deviates from the
official virtio-pci spec slightly: It puts a new "apple type"
field at a static offset in config space and introduces a new discard
command.

This patch adds a new qdev property called "apple-type" to virtio-blk-pci.
When that property is set, we assume the virtio-blk device is an Apple one
of the specific type and act accordingly.

Signed-off-by: Alexander Graf <graf@amazon.com>
---
 hw/block/virtio-blk.c                       | 23 +++++++++++++++++++++
 hw/virtio/virtio-blk-pci.c                  |  7 +++++++
 include/hw/pci/pci_ids.h                    |  1 +
 include/hw/virtio/virtio-blk.h              |  1 +
 include/standard-headers/linux/virtio_blk.h |  3 +++
 5 files changed, 35 insertions(+)

diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index 39e7f23fab..76b85bb3cb 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -1120,6 +1120,20 @@ static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb)
 
         break;
     }
+    case VIRTIO_BLK_T_APPLE1:
+    {
+        if (s->conf.x_apple_type) {
+            /* Only valid on Apple Virtio */
+            char buf[iov_size(in_iov, in_num)];
+            memset(buf, 0, sizeof(buf));
+            iov_from_buf(in_iov, in_num, 0, buf, sizeof(buf));
+            virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
+        } else {
+            virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
+        }
+        virtio_blk_free_request(req);
+        break;
+    }
     default:
         virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
         virtio_blk_free_request(req);
@@ -1351,6 +1365,10 @@ static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
     } else {
         blkcfg.zoned.model = VIRTIO_BLK_Z_NONE;
     }
+    if (s->conf.x_apple_type) {
+        /* Apple abuses the same location for its type id */
+        blkcfg.max_secure_erase_sectors = s->conf.x_apple_type;
+    }
     memcpy(config, &blkcfg, s->config_size);
 }
 
@@ -1625,6 +1643,10 @@ static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
 
     s->config_size = virtio_get_config_size(&virtio_blk_cfg_size_params,
                                             s->host_features);
+    if (s->conf.x_apple_type) {
+        /* Apple Virtio puts the blk type at 0x3c, make sure we have space. */
+        s->config_size = MAX(s->config_size, 0x3d);
+    }
     virtio_init(vdev, VIRTIO_ID_BLOCK, s->config_size);
 
     s->blk = conf->conf.blk;
@@ -1734,6 +1756,7 @@ static Property virtio_blk_properties[] = {
                        conf.max_write_zeroes_sectors, BDRV_REQUEST_MAX_SECTORS),
     DEFINE_PROP_BOOL("x-enable-wce-if-config-wce", VirtIOBlock,
                      conf.x_enable_wce_if_config_wce, true),
+    DEFINE_PROP_UINT32("x-apple-type", VirtIOBlock, conf.x_apple_type, 0),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/virtio/virtio-blk-pci.c b/hw/virtio/virtio-blk-pci.c
index 9743bee965..5fbf98f750 100644
--- a/hw/virtio/virtio-blk-pci.c
+++ b/hw/virtio/virtio-blk-pci.c
@@ -62,6 +62,13 @@ static void virtio_blk_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
     }
 
     qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
+
+    if (conf->x_apple_type) {
+        /* Apple virtio-blk uses a different vendor/device id */
+        pci_config_set_vendor_id(vpci_dev->pci_dev.config, PCI_VENDOR_ID_APPLE);
+        pci_config_set_device_id(vpci_dev->pci_dev.config,
+                                 PCI_DEVICE_ID_APPLE_VIRTIO_BLK);
+    }
 }
 
 static void virtio_blk_pci_class_init(ObjectClass *klass, void *data)
diff --git a/include/hw/pci/pci_ids.h b/include/hw/pci/pci_ids.h
index e4386ebb20..74e589a298 100644
--- a/include/hw/pci/pci_ids.h
+++ b/include/hw/pci/pci_ids.h
@@ -188,6 +188,7 @@
 #define PCI_DEVICE_ID_APPLE_UNI_N_AGP    0x0020
 #define PCI_DEVICE_ID_APPLE_U3_AGP       0x004b
 #define PCI_DEVICE_ID_APPLE_UNI_N_GMAC   0x0021
+#define PCI_DEVICE_ID_APPLE_VIRTIO_BLK   0x1a00
 
 #define PCI_VENDOR_ID_SUN                0x108e
 #define PCI_DEVICE_ID_SUN_EBUS           0x1000
diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h
index dafec432ce..7117ce754c 100644
--- a/include/hw/virtio/virtio-blk.h
+++ b/include/hw/virtio/virtio-blk.h
@@ -46,6 +46,7 @@ struct VirtIOBlkConf
     uint32_t max_discard_sectors;
     uint32_t max_write_zeroes_sectors;
     bool x_enable_wce_if_config_wce;
+    uint32_t x_apple_type;
 };
 
 struct VirtIOBlockDataPlane;
diff --git a/include/standard-headers/linux/virtio_blk.h b/include/standard-headers/linux/virtio_blk.h
index 7155b1a470..bbea5d50b9 100644
--- a/include/standard-headers/linux/virtio_blk.h
+++ b/include/standard-headers/linux/virtio_blk.h
@@ -204,6 +204,9 @@ struct virtio_blk_config {
 /* Reset All zones command */
 #define VIRTIO_BLK_T_ZONE_RESET_ALL 26
 
+/* Write zeroes command */
+#define VIRTIO_BLK_T_APPLE1	0x10000
+
 #ifndef VIRTIO_BLK_NO_LEGACY
 /* Barrier before this op. */
 #define VIRTIO_BLK_T_BARRIER	0x80000000
-- 
2.39.2 (Apple Git-143)




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