[SeaBIOS] [PATCH] fix two issues with virtio-blk
Gleb Natapov
gleb at redhat.com
Tue May 11 14:21:09 CEST 2010
1. Check if blk_size is valid in virtio_blk config.
2. Disable interrupt otherwise interrupt may stuck
with some guests.
Signed-off-by: Gleb Natapov <gleb at redhat.com>
diff --git a/src/virtio-blk.c b/src/virtio-blk.c
index 6c3f8a5..96334b1 100644
--- a/src/virtio-blk.c
+++ b/src/virtio-blk.c
@@ -138,7 +138,9 @@ virtio_blk_setup(void)
struct virtio_blk_config cfg;
vp_get(ioaddr, 0, &cfg, sizeof(cfg));
- vdrive_g->drive.blksize = cfg.blk_size;
+ u32 f = vp_get_features(ioaddr);
+ vdrive_g->drive.blksize = (f & (1 << VIRTIO_BLK_F_BLK_SIZE)) ?
+ cfg.blk_size : DISK_SECTOR_SIZE;
vdrive_g->drive.sectors = cfg.capacity;
dprintf(3, "virtio-blk %x:%x blksize=%d sectors=%u\n",
pci_bdf_to_bus (bdf), pci_bdf_to_dev(bdf),
diff --git a/src/virtio-blk.h b/src/virtio-blk.h
index 8095d5b..7243704 100644
--- a/src/virtio-blk.h
+++ b/src/virtio-blk.h
@@ -16,6 +16,8 @@ struct virtio_blk_config
u32 opt_io_size;
} __attribute__((packed));
+#define VIRTIO_BLK_F_BLK_SIZE 6
+
/* These two define direction. */
#define VIRTIO_BLK_T_IN 0
#define VIRTIO_BLK_T_OUT 1
diff --git a/src/virtio-ring.h b/src/virtio-ring.h
index 95ae85b..f2f2460 100644
--- a/src/virtio-ring.h
+++ b/src/virtio-ring.h
@@ -105,6 +105,8 @@ static inline void vring_init(struct vring *vr,
vr->desc = phys_to_virt(pa);
vr->avail = (struct vring_avail *)&vr->desc[num];
+ /* disable interrupts */
+ vr->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
/* physical address of used must be page aligned */
--
Gleb.
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