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lguest: make Launcher see device status updates

Browse source 
This brings us closer to Real Life, where we'd examine the device
features once it's set the DRIVER_OK status bit.

Signed-off-by: Rusty Russell <[email protected]>
This commit is contained in:
Rusty Russell 2008-05-02 21:50:53 -05:00
commit a007a751d9
2 changed files with 48 additions and 22 deletions
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26
drivers/lguest/lguest_device.c
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@ -144,22 +144,28 @@ static u8 lg_get_status(struct virtio_device *vdev)
return to_lgdev(vdev)->desc->status;
}
static void lg_set_status(struct virtio_device *vdev, u8 status)
{
BUG_ON(!status);
to_lgdev(vdev)->desc->status = status;
}
/* To reset the device, we (ab)use the NOTIFY hypercall, with the descriptor
* address of the device. The Host will zero the status and all the
* features. */
static void lg_reset(struct virtio_device *vdev)
/* To notify on status updates, we (ab)use the NOTIFY hypercall, with the
* descriptor address of the device. A zero status means "reset". */
static void set_status(struct virtio_device *vdev, u8 status)
{
unsigned long offset = (void *)to_lgdev(vdev)->desc - lguest_devices;
/* We set the status. */
to_lgdev(vdev)->desc->status = status;
hcall(LHCALL_NOTIFY, (max_pfn<<PAGE_SHIFT) + offset, 0, 0);
}
static void lg_set_status(struct virtio_device *vdev, u8 status)
{
BUG_ON(!status);
set_status(vdev, status);
}
static void lg_reset(struct virtio_device *vdev)
{
set_status(vdev, 0);
}
/*
* Virtqueues
*