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virtio: change memcpy to guest reads 

When accessing the device specific virtio config space, we memcpy
the data into a variable in QEMU. At that point we're basically
pulling host endianness into the game which is a really bad idea.

So instead, let's use the target specific load/store helpers for
memory pointers which fetch things in target endianness. The whole
array is already populated in target endianness anyways
(see virtio-blk).

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Alexander Graf 2012-01-10 23:33:10 +01:00
parent 82afa58641
commit 06dbfc6f88
1 changed files with 6 additions and 6 deletions

12
hw/virtio.c
View File

@ -539,7 +539,7 @@ uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr)
if (addr > (vdev->config_len - sizeof(val)))
return (uint32_t)-1;
memcpy(&val, vdev->config + addr, sizeof(val));
val = ldub_p(vdev->config + addr);
return val;
}
@ -552,7 +552,7 @@ uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr)
if (addr > (vdev->config_len - sizeof(val)))
return (uint32_t)-1;
memcpy(&val, vdev->config + addr, sizeof(val));
val = lduw_p(vdev->config + addr);
return val;
}
@ -565,7 +565,7 @@ uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr)
if (addr > (vdev->config_len - sizeof(val)))
return (uint32_t)-1;
memcpy(&val, vdev->config + addr, sizeof(val));
val = ldl_p(vdev->config + addr);
return val;
}
@ -576,7 +576,7 @@ void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
if (addr > (vdev->config_len - sizeof(val)))
return;
memcpy(vdev->config + addr, &val, sizeof(val));
stb_p(vdev->config + addr, val);
if (vdev->set_config)
vdev->set_config(vdev, vdev->config);
@ -589,7 +589,7 @@ void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
if (addr > (vdev->config_len - sizeof(val)))
return;
memcpy(vdev->config + addr, &val, sizeof(val));
stw_p(vdev->config + addr, val);
if (vdev->set_config)
vdev->set_config(vdev, vdev->config);
@ -602,7 +602,7 @@ void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
if (addr > (vdev->config_len - sizeof(val)))
return;
memcpy(vdev->config + addr, &val, sizeof(val));
stl_p(vdev->config + addr, val);
if (vdev->set_config)
vdev->set_config(vdev, vdev->config);