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[virtio] Cap queue size to MAX_QUEUE_NUM

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vpm_find_vqs incorrectly accepted the host provided queue size with no
regard to iPXE's internal limitations. Virtio 1.0 makes it possible for
the driver to override the queue size to reduce memory requirements and
iPXE is a great use case for this feature.

Also removing the extra vq->vring.num assignment which is already
handled in vring_init.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Ladi Prosek
2016-12-16 10:54:32 +01:00
committed by Michael Brown
parent dfbbc16ae3
commit e45451c699
2 changed files with 10 additions and 4 deletions
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6
src/include/ipxe/virtio-ring.h
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@@ -95,7 +95,7 @@ static inline void vring_init(struct vring *vr,
unsigned int i;
unsigned long pa;
vr->num = num;
vr->num = num;
/* physical address of desc must be page aligned */
@@ -103,13 +103,13 @@ static inline void vring_init(struct vring *vr,
pa = (pa + PAGE_MASK) & ~PAGE_MASK;
vr->desc = phys_to_virt(pa);
vr->avail = (struct vring_avail *)&vr->desc[num];
vr->avail = (struct vring_avail *)&vr->desc[num];
/* physical address of used must be page aligned */
pa = virt_to_phys(&vr->avail->ring[num]);
pa = (pa + PAGE_MASK) & ~PAGE_MASK;
vr->used = phys_to_virt(pa);
vr->used = phys_to_virt(pa);
for (i = 0; i < num - 1; i++)
vr->desc[i].next = i + 1;