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[Qemu-devel] [PATCH] qemu: make virtio-blk PCI compliant by default
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PATCH] qemu: make virtio-blk PCI compliant by default |
Date: |
Mon, 7 Sep 2009 21:14:37 +0300 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
commit bf011293faaa7f87e4de83185931e7411b794128 made virtio-blk-pci not
PCI-compliant, since it makes region 0 (which is an i/o region)
size > 256, and, since PCI 2.1, i/o regions are limited to 256 bytes size.
When the ATA serial number feature is off, which is the default,
make the device spec compliant again, by making region 0 smaller.
Signed-off-by: Michael S. Tsirkin <address@hidden>
Reported-by: Vadim Rozenfeld <address@hidden>
Tested-by: Vadim Rozenfeld <address@hidden>
---
Note: the companion feature in guest kernel was added by
1d589bb16b825b3a7b4edd34d997f1f1f953033d in linux 2.6.31-rc1.
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index a33eafb..3652c0a 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -27,6 +27,7 @@ typedef struct VirtIOBlock
void *rq;
char serial_str[BLOCK_SERIAL_STRLEN + 1];
QEMUBH *bh;
+ size_t config_size;
} VirtIOBlock;
static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev)
@@ -362,7 +363,7 @@ static void virtio_blk_update_config(VirtIODevice *vdev,
uint8_t *config)
virtio_identify_template(&blkcfg);
memcpy(&blkcfg.identify[VIRTIO_BLK_ID_SN], s->serial_str,
VIRTIO_BLK_ID_SN_BYTES);
- memcpy(config, &blkcfg, sizeof(blkcfg));
+ memcpy(config, &blkcfg, s->config_size);
}
static uint32_t virtio_blk_get_features(VirtIODevice *vdev)
@@ -419,18 +420,21 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, DriveInfo
*dinfo)
VirtIOBlock *s;
int cylinders, heads, secs;
static int virtio_blk_id;
- char *ps;
+ char *ps = (char *)drive_get_serial(dinfo->bdrv);
+ size_t size = strlen(ps) ? sizeof(struct virtio_blk_config) :
+ offsetof(struct virtio_blk_config, _blk_size);
s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
- sizeof(struct virtio_blk_config),
+ size,
sizeof(VirtIOBlock));
+ s->config_size = size;
s->vdev.get_config = virtio_blk_update_config;
s->vdev.get_features = virtio_blk_get_features;
s->vdev.reset = virtio_blk_reset;
s->bs = dinfo->bdrv;
s->rq = NULL;
- if (strlen(ps = (char *)drive_get_serial(s->bs)))
+ if (strlen(ps))
strncpy(s->serial_str, ps, sizeof(s->serial_str));
else
snprintf(s->serial_str, sizeof(s->serial_str), "0");
--
1.6.2.5
- [Qemu-devel] [PATCH] qemu: make virtio-blk PCI compliant by default,
Michael S. Tsirkin <=
- [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default, john cooper, 2009/09/08
- [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default, Michael S. Tsirkin, 2009/09/08
- [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default, Rusty Russell, 2009/09/21
- [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default, john cooper, 2009/09/21
- Re: [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default, Avi Kivity, 2009/09/22
- Re: [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default, john cooper, 2009/09/22
- Re: [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default, Avi Kivity, 2009/09/22
- Re: [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default, Michael S. Tsirkin, 2009/09/22
- Re: [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default, Avi Kivity, 2009/09/22
- Re: [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default, john cooper, 2009/09/22