virtio: Do not init non-bootable devices

Because initializing a virtio-blk or virtio-scsi device requires a large
amount of memory, you cannot create more than about 10 virtio devices.
Since initialization is required for booting from media, we will not
initialize those devices that are not in the boot order list.

Signed-off-by: Alexey Kirillov <lekiravi@yandex-team.ru>
Message-id: 20200107171917.7535-3-lekiravi@yandex-team.ru
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/src/hw/virtio-scsi.c b/src/hw/virtio-scsi.c
index e1e2f5d..a27bdc1 100644
--- a/src/hw/virtio-scsi.c
+++ b/src/hw/virtio-scsi.c
@@ -18,7 +18,7 @@
 #include "stacks.h" // run_thread
 #include "std/disk.h" // DISK_RET_SUCCESS
 #include "string.h" // memset
-#include "util.h" // usleep
+#include "util.h" // usleep, bootprio_find_pci_device, is_bootprio_strict
 #include "virtio-pci.h"
 #include "virtio-ring.h"
 #include "virtio-scsi.h"
@@ -205,6 +205,8 @@ fail:
 void
 virtio_scsi_setup(void)
 {
+    u8 skip_nonbootable = is_bootprio_strict();
+
     ASSERT32FLAT();
     if (! CONFIG_VIRTIO_SCSI)
         return;
@@ -217,6 +219,13 @@ virtio_scsi_setup(void)
             (pci->device != PCI_DEVICE_ID_VIRTIO_SCSI_09 &&
              pci->device != PCI_DEVICE_ID_VIRTIO_SCSI_10))
             continue;
+
+        if (skip_nonbootable && bootprio_find_pci_device(pci) < 0) {
+            dprintf(1, "skipping init of a non-bootable virtio-scsi at %pP\n",
+                    pci);
+            continue;
+        }
+
         run_thread(init_virtio_scsi, pci);
     }
 }