* Re: [Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1
2015-09-07 11:33 [Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1 Pierre Morel
@ 2015-09-07 15:03 ` Greg Kurz
2015-09-08 7:43 ` Greg Kurz
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Greg Kurz @ 2015-09-07 15:03 UTC (permalink / raw)
To: Pierre Morel; +Cc: cornelia.huck, qemu-devel, stefanha, mst
On Mon, 7 Sep 2015 13:33:56 +0200
Pierre Morel <pmorel@linux.vnet.ibm.com> wrote:
> 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 <pmorel@linux.vnet.ibm.com>
> (changed __virtio16 into uint16_t,
> map descriptor table and available ring read-only)
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> ---
>
I have tested it works on ppc64.
Tested-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> 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 */
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1
2015-09-07 11:33 [Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1 Pierre Morel
2015-09-07 15:03 ` Greg Kurz
@ 2015-09-08 7:43 ` Greg Kurz
2015-09-09 9:29 ` Stefan Hajnoczi
2015-09-09 12:02 ` Michael S. Tsirkin
3 siblings, 0 replies; 6+ messages in thread
From: Greg Kurz @ 2015-09-08 7:43 UTC (permalink / raw)
To: Pierre Morel; +Cc: cornelia.huck, qemu-stable, qemu-devel, stefanha, mst
On Mon, 7 Sep 2015 13:33:56 +0200
Pierre Morel <pmorel@linux.vnet.ibm.com> wrote:
> 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 <pmorel@linux.vnet.ibm.com>
> (changed __virtio16 into uint16_t,
> map descriptor table and available ring read-only)
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> ---
>
As suggested by Michael during the review of v2.
Cc: qemu-stable@nongnu.org
--
Greg
> 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 */
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1
2015-09-07 11:33 [Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1 Pierre Morel
2015-09-07 15:03 ` Greg Kurz
2015-09-08 7:43 ` Greg Kurz
@ 2015-09-09 9:29 ` Stefan Hajnoczi
2015-09-09 12:46 ` Greg Kurz
2015-09-09 12:02 ` Michael S. Tsirkin
3 siblings, 1 reply; 6+ messages in thread
From: Stefan Hajnoczi @ 2015-09-09 9:29 UTC (permalink / raw)
To: Pierre Morel; +Cc: cornelia.huck, gkurz, qemu-devel, stefanha, mst
On Mon, Sep 07, 2015 at 01:33:56PM +0200, Pierre Morel wrote:
> 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 <pmorel@linux.vnet.ibm.com>
> (changed __virtio16 into uint16_t,
> map descriptor table and available ring read-only)
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> ---
>
> 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(-)
Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1
2015-09-09 9:29 ` Stefan Hajnoczi
@ 2015-09-09 12:46 ` Greg Kurz
0 siblings, 0 replies; 6+ messages in thread
From: Greg Kurz @ 2015-09-09 12:46 UTC (permalink / raw)
To: Stefan Hajnoczi
Cc: mst, Pierre Morel, qemu-stable, qemu-devel, stefanha,
cornelia.huck
On Wed, 9 Sep 2015 10:29:51 +0100
Stefan Hajnoczi <stefanha@gmail.com> wrote:
> On Mon, Sep 07, 2015 at 01:33:56PM +0200, Pierre Morel wrote:
> > 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 <pmorel@linux.vnet.ibm.com>
> > (changed __virtio16 into uint16_t,
> > map descriptor table and available ring read-only)
> > Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> > ---
> >
> > 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(-)
>
> Thanks, applied to my block tree:
> https://github.com/stefanha/qemu/commits/block
>
> Stefan
>
Cc: qemu-stable@nongnu.org
--
Greg
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1
2015-09-07 11:33 [Qemu-devel] [PATCH v5] virtio dataplane: adapt dataplane for virtio Version 1 Pierre Morel
` (2 preceding siblings ...)
2015-09-09 9:29 ` Stefan Hajnoczi
@ 2015-09-09 12:02 ` Michael S. Tsirkin
3 siblings, 0 replies; 6+ messages in thread
From: Michael S. Tsirkin @ 2015-09-09 12:02 UTC (permalink / raw)
To: Pierre Morel; +Cc: cornelia.huck, qemu-devel, stefanha, gkurz
On Mon, Sep 07, 2015 at 01:33:56PM +0200, Pierre Morel wrote:
> 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 <pmorel@linux.vnet.ibm.com>
> (changed __virtio16 into uint16_t,
> map descriptor table and available ring read-only)
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>
> 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
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