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[Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Ver
From: |
Pierre Morel |
Subject: |
[Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1 |
Date: |
Mon, 7 Sep 2015 13:33:56 +0200 |
Let dataplane allocate different region for the desc/avail/used
ring regions.
Take VIRTIO_RING_F_EVENT_IDX into account to increase the used/avail
rings accordingly.
Signed-off-by: Pierre Morel <address@hidden>
(changed __virtio16 into uint16_t,
map descriptor table and available ring read-only)
Signed-off-by: Greg Kurz <address@hidden>
---
Changes from V4:
- added comments for VIRTIO_RING_F_EVENT_IDX and mapping
- use uint16_t as in ring definitions instead of __virtio16
- map descriptor table and available ring read-only
Changes from V3:
- added changelog
Changes from V2:
- incorporate the code directly in vring_setup().
- added room for the event indexes used with VIRTIO_RING_F_EVENT_IDX
Changes from v1:
- use a macro to gain LOCs inside of vring_setup()
hw/virtio/dataplane/vring.c | 66 +++++++++++++++++++++++++++++--------
include/hw/virtio/dataplane/vring.h | 4 ++-
2 files changed, 55 insertions(+), 15 deletions(-)
diff --git a/hw/virtio/dataplane/vring.c b/hw/virtio/dataplane/vring.c
index 07fd69c..75db534 100644
--- a/hw/virtio/dataplane/vring.c
+++ b/hw/virtio/dataplane/vring.c
@@ -67,22 +67,50 @@ static void vring_unmap(void *buffer, bool is_write)
/* Map the guest's vring to host memory */
bool vring_setup(Vring *vring, VirtIODevice *vdev, int n)
{
- hwaddr vring_addr = virtio_queue_get_ring_addr(vdev, n);
- hwaddr vring_size = virtio_queue_get_ring_size(vdev, n);
- void *vring_ptr;
+ struct vring *vr = &vring->vr;
+ hwaddr addr;
+ hwaddr size;
+ void *ptr;
vring->broken = false;
-
- vring_ptr = vring_map(&vring->mr, vring_addr, vring_size, true);
- if (!vring_ptr) {
- error_report("Failed to map vring "
- "addr %#" HWADDR_PRIx " size %" HWADDR_PRIu,
- vring_addr, vring_size);
- vring->broken = true;
- return false;
+ vr->num = virtio_queue_get_num(vdev, n);
+
+ addr = virtio_queue_get_desc_addr(vdev, n);
+ size = virtio_queue_get_desc_size(vdev, n);
+ /* Map the descriptor area as read only */
+ ptr = vring_map(&vring->mr_desc, addr, size, false);
+ if (!ptr) {
+ error_report("Failed to map 0x%16lx byte for vring desc at %16lx",
+ size, addr);
+ goto out_err_desc;
}
-
- vring_init(&vring->vr, virtio_queue_get_num(vdev, n), vring_ptr, 4096);
+ vr->desc = ptr;
+
+ addr = virtio_queue_get_avail_addr(vdev, n);
+ size = virtio_queue_get_avail_size(vdev, n);
+ /* Add the size of the used_event_idx */
+ size += sizeof(uint16_t);
+ /* Map the driver area as read only */
+ ptr = vring_map(&vring->mr_avail, addr, size, false);
+ if (!ptr) {
+ error_report("Failed to map 0x%16lx byte for vring avail at %16lx",
+ size, addr);
+ goto out_err_avail;
+ }
+ vr->avail = ptr;
+
+ addr = virtio_queue_get_used_addr(vdev, n);
+ size = virtio_queue_get_used_size(vdev, n);
+ /* Add the size of the avail_event_idx */
+ size += sizeof(uint16_t);
+ /* Map the device area as read-write */
+ ptr = vring_map(&vring->mr_used, addr, size, true);
+ if (!ptr) {
+ error_report("Failed to map 0x%16lx byte for vring used at %16lx",
+ size, addr);
+ goto out_err_used;
+ }
+ vr->used = ptr;
vring->last_avail_idx = virtio_queue_get_last_avail_idx(vdev, n);
vring->last_used_idx = vring_get_used_idx(vdev, vring);
@@ -92,6 +120,14 @@ bool vring_setup(Vring *vring, VirtIODevice *vdev, int n)
trace_vring_setup(virtio_queue_get_ring_addr(vdev, n),
vring->vr.desc, vring->vr.avail, vring->vr.used);
return true;
+
+out_err_used:
+ memory_region_unref(vring->mr_avail);
+out_err_avail:
+ memory_region_unref(vring->mr_desc);
+out_err_desc:
+ vring->broken = true;
+ return false;
}
void vring_teardown(Vring *vring, VirtIODevice *vdev, int n)
@@ -99,7 +135,9 @@ void vring_teardown(Vring *vring, VirtIODevice *vdev, int n)
virtio_queue_set_last_avail_idx(vdev, n, vring->last_avail_idx);
virtio_queue_invalidate_signalled_used(vdev, n);
- memory_region_unref(vring->mr);
+ memory_region_unref(vring->mr_desc);
+ memory_region_unref(vring->mr_avail);
+ memory_region_unref(vring->mr_used);
}
/* Disable guest->host notifies */
diff --git a/include/hw/virtio/dataplane/vring.h
b/include/hw/virtio/dataplane/vring.h
index 8d97db9..a596e4c 100644
--- a/include/hw/virtio/dataplane/vring.h
+++ b/include/hw/virtio/dataplane/vring.h
@@ -22,7 +22,9 @@
#include "hw/virtio/virtio.h"
typedef struct {
- MemoryRegion *mr; /* memory region containing the vring */
+ MemoryRegion *mr_desc; /* memory region for the vring desc */
+ MemoryRegion *mr_avail; /* memory region for the vring avail */
+ MemoryRegion *mr_used; /* memory region for the vring used */
struct vring vr; /* virtqueue vring mapped to host memory */
uint16_t last_avail_idx; /* last processed avail ring index */
uint16_t last_used_idx; /* last processed used ring index */
--
2.3.0
- [Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1,
Pierre Morel <=