| Message ID | 1412692807-12398-8-git-send-email-cornelia.huck@de.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, 7 Oct 2014 16:40:03 +0200 Cornelia Huck <cornelia.huck@de.ibm.com> wrote: > Handle endianness conversion for virtio-1 virtqueues correctly. > > Note that dataplane now needs to be built per-target. > It also affects hw/virtio/virtio-pci.c: In file included from include/hw/virtio/dataplane/vring.h:23:0, from include/hw/virtio/virtio-scsi.h:21, from hw/virtio/virtio-pci.c:24: include/hw/virtio/virtio-access.h: In function ‘virtio_access_is_big_endian’: include/hw/virtio/virtio-access.h:28:15: error: attempt to use poisoned "TARGET_WORDS_BIGENDIAN" #elif defined(TARGET_WORDS_BIGENDIAN) ^ FWIW when I added endian ambivalent support to virtio, I remember *some people* getting angry at the idea of turning common code into per-target... :) See comment below. > Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> > --- > hw/block/dataplane/virtio-blk.c | 3 +- > hw/scsi/virtio-scsi-dataplane.c | 2 +- > hw/virtio/Makefile.objs | 2 +- > hw/virtio/dataplane/Makefile.objs | 2 +- > hw/virtio/dataplane/vring.c | 85 +++++++++++++++++++---------------- > include/hw/virtio/dataplane/vring.h | 64 ++++++++++++++++++++++++-- > 6 files changed, 113 insertions(+), 45 deletions(-) > > diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c > index 5458f9d..eb45a3d 100644 > --- a/hw/block/dataplane/virtio-blk.c > +++ b/hw/block/dataplane/virtio-blk.c > @@ -16,6 +16,7 @@ > #include "qemu/iov.h" > #include "qemu/thread.h" > #include "qemu/error-report.h" > +#include "hw/virtio/virtio-access.h" > #include "hw/virtio/dataplane/vring.h" > #include "block/block.h" > #include "hw/virtio/virtio-blk.h" > @@ -75,7 +76,7 @@ static void complete_request_vring(VirtIOBlockReq *req, unsigned char status) > VirtIOBlockDataPlane *s = req->dev->dataplane; > stb_p(&req->in->status, status); > > - vring_push(&req->dev->dataplane->vring, &req->elem, > + vring_push(s->vdev, &req->dev->dataplane->vring, &req->elem, > req->qiov.size + sizeof(*req->in)); > > /* Suppress notification to guest by BH and its scheduled > diff --git a/hw/scsi/virtio-scsi-dataplane.c b/hw/scsi/virtio-scsi-dataplane.c > index b778e05..3e2b706 100644 > --- a/hw/scsi/virtio-scsi-dataplane.c > +++ b/hw/scsi/virtio-scsi-dataplane.c > @@ -81,7 +81,7 @@ VirtIOSCSIReq *virtio_scsi_pop_req_vring(VirtIOSCSI *s, > > void virtio_scsi_vring_push_notify(VirtIOSCSIReq *req) > { > - vring_push(&req->vring->vring, &req->elem, > + vring_push((VirtIODevice *)req->dev, &req->vring->vring, &req->elem, > req->qsgl.size + req->resp_iov.size); > event_notifier_set(&req->vring->guest_notifier); > } > diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs > index d21c397..19b224a 100644 > --- a/hw/virtio/Makefile.objs > +++ b/hw/virtio/Makefile.objs > @@ -2,7 +2,7 @@ common-obj-y += virtio-rng.o > common-obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o > common-obj-y += virtio-bus.o > common-obj-y += virtio-mmio.o > -common-obj-$(CONFIG_VIRTIO) += dataplane/ > +obj-$(CONFIG_VIRTIO) += dataplane/ > > obj-y += virtio.o virtio-balloon.o > obj-$(CONFIG_LINUX) += vhost.o vhost-backend.o vhost-user.o > diff --git a/hw/virtio/dataplane/Makefile.objs b/hw/virtio/dataplane/Makefile.objs > index 9a8cfc0..753a9ca 100644 > --- a/hw/virtio/dataplane/Makefile.objs > +++ b/hw/virtio/dataplane/Makefile.objs > @@ -1 +1 @@ > -common-obj-y += vring.o > +obj-y += vring.o > diff --git a/hw/virtio/dataplane/vring.c b/hw/virtio/dataplane/vring.c > index b84957f..4624521 100644 > --- a/hw/virtio/dataplane/vring.c > +++ b/hw/virtio/dataplane/vring.c > @@ -18,6 +18,7 @@ > #include "hw/hw.h" > #include "exec/memory.h" > #include "exec/address-spaces.h" > +#include "hw/virtio/virtio-access.h" > #include "hw/virtio/dataplane/vring.h" > #include "qemu/error-report.h" > > @@ -83,7 +84,7 @@ bool vring_setup(Vring *vring, VirtIODevice *vdev, int n) > vring_init(&vring->vr, virtio_queue_get_num(vdev, n), vring_ptr, 4096); > > vring->last_avail_idx = virtio_queue_get_last_avail_idx(vdev, n); > - vring->last_used_idx = vring->vr.used->idx; > + vring->last_used_idx = vring_get_used_idx(vdev, vring); > vring->signalled_used = 0; > vring->signalled_used_valid = false; > > @@ -104,7 +105,7 @@ void vring_teardown(Vring *vring, VirtIODevice *vdev, int n) > void vring_disable_notification(VirtIODevice *vdev, Vring *vring) > { > if (!(vdev->guest_features[0] & (1 << VIRTIO_RING_F_EVENT_IDX))) { > - vring->vr.used->flags |= VRING_USED_F_NO_NOTIFY; > + vring_set_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY); > } > } > > @@ -117,10 +118,10 @@ bool vring_enable_notification(VirtIODevice *vdev, Vring *vring) > if (vdev->guest_features[0] & (1 << VIRTIO_RING_F_EVENT_IDX)) { > vring_avail_event(&vring->vr) = vring->vr.avail->idx; > } else { > - vring->vr.used->flags &= ~VRING_USED_F_NO_NOTIFY; > + vring_clear_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY); > } > smp_mb(); /* ensure update is seen before reading avail_idx */ > - return !vring_more_avail(vring); > + return !vring_more_avail(vdev, vring); > } > > /* This is stolen from linux/drivers/vhost/vhost.c:vhost_notify() */ > @@ -134,12 +135,13 @@ bool vring_should_notify(VirtIODevice *vdev, Vring *vring) > smp_mb(); > > if ((vdev->guest_features[0] & VIRTIO_F_NOTIFY_ON_EMPTY) && > - unlikely(vring->vr.avail->idx == vring->last_avail_idx)) { > + unlikely(!vring_more_avail(vdev, vring))) { > return true; > } > > if (!(vdev->guest_features[0] & VIRTIO_RING_F_EVENT_IDX)) { > - return !(vring->vr.avail->flags & VRING_AVAIL_F_NO_INTERRUPT); > + return !(vring_get_avail_flags(vdev, vring) & > + VRING_AVAIL_F_NO_INTERRUPT); > } > old = vring->signalled_used; > v = vring->signalled_used_valid; > @@ -154,15 +156,18 @@ bool vring_should_notify(VirtIODevice *vdev, Vring *vring) > } > > > -static int get_desc(Vring *vring, VirtQueueElement *elem, > +static int get_desc(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem, > struct vring_desc *desc) > { > unsigned *num; > struct iovec *iov; > hwaddr *addr; > MemoryRegion *mr; > + int is_write = virtio_tswap16(vdev, desc->flags) & VRING_DESC_F_WRITE; > + uint32_t len = virtio_tswap32(vdev, desc->len); > + uint64_t desc_addr = virtio_tswap64(vdev, desc->addr); > > - if (desc->flags & VRING_DESC_F_WRITE) { > + if (is_write) { > num = &elem->in_num; > iov = &elem->in_sg[*num]; > addr = &elem->in_addr[*num]; > @@ -186,44 +191,45 @@ static int get_desc(Vring *vring, VirtQueueElement *elem, > } > > /* TODO handle non-contiguous memory across region boundaries */ > - iov->iov_base = vring_map(&mr, desc->addr, desc->len, > - desc->flags & VRING_DESC_F_WRITE); > + iov->iov_base = vring_map(&mr, desc_addr, len, is_write); > if (!iov->iov_base) { > error_report("Failed to map descriptor addr %#" PRIx64 " len %u", > - (uint64_t)desc->addr, desc->len); > + (uint64_t)desc_addr, len); > return -EFAULT; > } > > /* The MemoryRegion is looked up again and unref'ed later, leave the > * ref in place. */ > - iov->iov_len = desc->len; > - *addr = desc->addr; > + iov->iov_len = len; > + *addr = desc_addr; > *num += 1; > return 0; > } > > /* This is stolen from linux/drivers/vhost/vhost.c. */ > -static int get_indirect(Vring *vring, VirtQueueElement *elem, > - struct vring_desc *indirect) > +static int get_indirect(VirtIODevice *vdev, Vring *vring, > + VirtQueueElement *elem, struct vring_desc *indirect) > { > struct vring_desc desc; > unsigned int i = 0, count, found = 0; > int ret; > + uint32_t len = virtio_tswap32(vdev, indirect->len); > + uint64_t addr = virtio_tswap64(vdev, indirect->addr); > > /* Sanity check */ > - if (unlikely(indirect->len % sizeof(desc))) { > + if (unlikely(len % sizeof(desc))) { > error_report("Invalid length in indirect descriptor: " > "len %#x not multiple of %#zx", > - indirect->len, sizeof(desc)); > + len, sizeof(desc)); > vring->broken = true; > return -EFAULT; > } > > - count = indirect->len / sizeof(desc); > + count = len / sizeof(desc); > /* Buffers are chained via a 16 bit next field, so > * we can have at most 2^16 of these. */ > if (unlikely(count > USHRT_MAX + 1)) { > - error_report("Indirect buffer length too big: %d", indirect->len); > + error_report("Indirect buffer length too big: %d", len); > vring->broken = true; > return -EFAULT; > } > @@ -234,12 +240,12 @@ static int get_indirect(Vring *vring, VirtQueueElement *elem, > > /* Translate indirect descriptor */ > desc_ptr = vring_map(&mr, > - indirect->addr + found * sizeof(desc), > + addr + found * sizeof(desc), > sizeof(desc), false); > if (!desc_ptr) { > error_report("Failed to map indirect descriptor " > "addr %#" PRIx64 " len %zu", > - (uint64_t)indirect->addr + found * sizeof(desc), > + (uint64_t)addr + found * sizeof(desc), > sizeof(desc)); > vring->broken = true; > return -EFAULT; > @@ -257,19 +263,20 @@ static int get_indirect(Vring *vring, VirtQueueElement *elem, > return -EFAULT; > } > > - if (unlikely(desc.flags & VRING_DESC_F_INDIRECT)) { > + if (unlikely(virtio_tswap16(vdev, desc.flags) > + & VRING_DESC_F_INDIRECT)) { > error_report("Nested indirect descriptor"); > vring->broken = true; > return -EFAULT; > } > > - ret = get_desc(vring, elem, &desc); > + ret = get_desc(vdev, vring, elem, &desc); > if (ret < 0) { > vring->broken |= (ret == -EFAULT); > return ret; > } > - i = desc.next; > - } while (desc.flags & VRING_DESC_F_NEXT); > + i = virtio_tswap16(vdev, desc.next); > + } while (virtio_tswap16(vdev, desc.flags) & VRING_DESC_F_NEXT); > return 0; > } > > @@ -320,7 +327,7 @@ int vring_pop(VirtIODevice *vdev, Vring *vring, > > /* Check it isn't doing very strange things with descriptor numbers. */ > last_avail_idx = vring->last_avail_idx; > - avail_idx = vring->vr.avail->idx; > + avail_idx = vring_get_avail_idx(vdev, vring); > barrier(); /* load indices now and not again later */ > > if (unlikely((uint16_t)(avail_idx - last_avail_idx) > num)) { > @@ -341,7 +348,7 @@ int vring_pop(VirtIODevice *vdev, Vring *vring, > > /* Grab the next descriptor number they're advertising, and increment > * the index we've seen. */ > - head = vring->vr.avail->ring[last_avail_idx % num]; > + head = vring_get_avail_ring(vdev, vring, last_avail_idx % num); > > elem->index = head; > > @@ -374,21 +381,21 @@ int vring_pop(VirtIODevice *vdev, Vring *vring, > /* Ensure descriptor is loaded before accessing fields */ > barrier(); > > - if (desc.flags & VRING_DESC_F_INDIRECT) { > - ret = get_indirect(vring, elem, &desc); > + if (virtio_tswap16(vdev, desc.flags) & VRING_DESC_F_INDIRECT) { > + ret = get_indirect(vdev, vring, elem, &desc); > if (ret < 0) { > goto out; > } > continue; > } > > - ret = get_desc(vring, elem, &desc); > + ret = get_desc(vdev, vring, elem, &desc); > if (ret < 0) { > goto out; > } > > - i = desc.next; > - } while (desc.flags & VRING_DESC_F_NEXT); > + i = virtio_tswap16(vdev, desc.next); > + } while (virtio_tswap16(vdev, desc.flags) & VRING_DESC_F_NEXT); > > /* On success, increment avail index. */ > vring->last_avail_idx++; > @@ -407,9 +414,9 @@ out: > * > * Stolen from linux/drivers/vhost/vhost.c. > */ > -void vring_push(Vring *vring, VirtQueueElement *elem, int len) > +void vring_push(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem, > + int len) > { > - struct vring_used_elem *used; > unsigned int head = elem->index; > uint16_t new; > > @@ -422,14 +429,16 @@ void vring_push(Vring *vring, VirtQueueElement *elem, int len) > > /* The virtqueue contains a ring of used buffers. Get a pointer to the > * next entry in that used ring. */ > - used = &vring->vr.used->ring[vring->last_used_idx % vring->vr.num]; > - used->id = head; > - used->len = len; > + vring_set_used_ring_id(vdev, vring, vring->last_used_idx % vring->vr.num, > + head); > + vring_set_used_ring_len(vdev, vring, vring->last_used_idx % vring->vr.num, > + len); > > /* Make sure buffer is written before we update index. */ > smp_wmb(); > > - new = vring->vr.used->idx = ++vring->last_used_idx; > + new = ++vring->last_used_idx; > + vring_set_used_idx(vdev, vring, new); > if (unlikely((int16_t)(new - vring->signalled_used) < (uint16_t)1)) { > vring->signalled_used_valid = false; > } > diff --git a/include/hw/virtio/dataplane/vring.h b/include/hw/virtio/dataplane/vring.h > index d3e086a..fde15f3 100644 > --- a/ > +++ b/include/hw/virtio/dataplane/vring.h > @@ -20,6 +20,7 @@ > #include "qemu-common.h" > #include "hw/virtio/virtio_ring.h" > #include "hw/virtio/virtio.h" > +#include "hw/virtio/virtio-access.h" > Since the following commit: commit 244e2898b7a7735b3da114c120abe206af56a167 Author: Fam Zheng <famz@redhat.com> Date: Wed Sep 24 15:21:41 2014 +0800 virtio-scsi: Add VirtIOSCSIVring in VirtIOSCSIReq The include/hw/virtio/dataplane/vring.h header is indirectly included by hw/virtio/virtio-pci.c. Why don't you move all this target dependent helpers to another header ? Cheers. -- Greg > typedef struct { > MemoryRegion *mr; /* memory region containing the vring */ > @@ -31,15 +32,71 @@ typedef struct { > bool broken; /* was there a fatal error? */ > } Vring; > > +static inline uint16_t vring_get_used_idx(VirtIODevice *vdev, Vring *vring) > +{ > + return virtio_tswap16(vdev, vring->vr.used->idx); > +} > + > +static inline void vring_set_used_idx(VirtIODevice *vdev, Vring *vring, > + uint16_t idx) > +{ > + vring->vr.used->idx = virtio_tswap16(vdev, idx); > +} > + > +static inline uint16_t vring_get_avail_idx(VirtIODevice *vdev, Vring *vring) > +{ > + return virtio_tswap16(vdev, vring->vr.avail->idx); > +} > + > +static inline uint16_t vring_get_avail_ring(VirtIODevice *vdev, Vring *vring, > + int i) > +{ > + return virtio_tswap16(vdev, vring->vr.avail->ring[i]); > +} > + > +static inline void vring_set_used_ring_id(VirtIODevice *vdev, Vring *vring, > + int i, uint32_t id) > +{ > + vring->vr.used->ring[i].id = virtio_tswap32(vdev, id); > +} > + > +static inline void vring_set_used_ring_len(VirtIODevice *vdev, Vring *vring, > + int i, uint32_t len) > +{ > + vring->vr.used->ring[i].len = virtio_tswap32(vdev, len); > +} > + > +static inline uint16_t vring_get_used_flags(VirtIODevice *vdev, Vring *vring) > +{ > + return virtio_tswap16(vdev, vring->vr.used->flags); > +} > + > +static inline uint16_t vring_get_avail_flags(VirtIODevice *vdev, Vring *vring) > +{ > + return virtio_tswap16(vdev, vring->vr.avail->flags); > +} > + > +static inline void vring_set_used_flags(VirtIODevice *vdev, Vring *vring, > + uint16_t flags) > +{ > + vring->vr.used->flags |= virtio_tswap16(vdev, flags); > +} > + > +static inline void vring_clear_used_flags(VirtIODevice *vdev, Vring *vring, > + uint16_t flags) > +{ > + vring->vr.used->flags &= virtio_tswap16(vdev, ~flags); > +} > + > static inline unsigned int vring_get_num(Vring *vring) > { > return vring->vr.num; > } > > /* Are there more descriptors available? */ > -static inline bool vring_more_avail(Vring *vring) > +static inline bool vring_more_avail(VirtIODevice *vdev, Vring *vring) > { > - return vring->vr.avail->idx != vring->last_avail_idx; > + return vring_get_avail_idx(vdev, vring) != vring->last_avail_idx; > } > > /* Fail future vring_pop() and vring_push() calls until reset */ > @@ -54,6 +111,7 @@ void vring_disable_notification(VirtIODevice *vdev, Vring *vring); > bool vring_enable_notification(VirtIODevice *vdev, Vring *vring); > bool vring_should_notify(VirtIODevice *vdev, Vring *vring); > int vring_pop(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem); > -void vring_push(Vring *vring, VirtQueueElement *elem, int len); > +void vring_push(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem, > + int len); > > #endif /* VRING_H */ -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, 28 Oct 2014 16:22:54 +0100 Greg Kurz <gkurz@linux.vnet.ibm.com> wrote: > On Tue, 7 Oct 2014 16:40:03 +0200 > Cornelia Huck <cornelia.huck@de.ibm.com> wrote: > > > Handle endianness conversion for virtio-1 virtqueues correctly. > > > > Note that dataplane now needs to be built per-target. > > > > It also affects hw/virtio/virtio-pci.c: > > In file included from include/hw/virtio/dataplane/vring.h:23:0, > from include/hw/virtio/virtio-scsi.h:21, > from hw/virtio/virtio-pci.c:24: > include/hw/virtio/virtio-access.h: In function ‘virtio_access_is_big_endian’: > include/hw/virtio/virtio-access.h:28:15: error: attempt to use poisoned "TARGET_WORDS_BIGENDIAN" > #elif defined(TARGET_WORDS_BIGENDIAN) > ^ > > FWIW when I added endian ambivalent support to virtio, I remember *some people* > getting angry at the idea of turning common code into per-target... :) Well, it probably can't be helped for something that is endian-sensitive like virtio :( (Although we should try to keep it as local as possible.) > > See comment below. > > > Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> > > --- > > hw/block/dataplane/virtio-blk.c | 3 +- > > hw/scsi/virtio-scsi-dataplane.c | 2 +- > > hw/virtio/Makefile.objs | 2 +- > > hw/virtio/dataplane/Makefile.objs | 2 +- > > hw/virtio/dataplane/vring.c | 85 +++++++++++++++++++---------------- > > include/hw/virtio/dataplane/vring.h | 64 ++++++++++++++++++++++++-- > > 6 files changed, 113 insertions(+), 45 deletions(-) > > > > diff --git a/include/hw/virtio/dataplane/vring.h b/include/hw/virtio/dataplane/vring.h > > index d3e086a..fde15f3 100644 > > --- a/ > > +++ b/include/hw/virtio/dataplane/vring.h > > @@ -20,6 +20,7 @@ > > #include "qemu-common.h" > > #include "hw/virtio/virtio_ring.h" > > #include "hw/virtio/virtio.h" > > +#include "hw/virtio/virtio-access.h" > > > > Since the following commit: > > commit 244e2898b7a7735b3da114c120abe206af56a167 > Author: Fam Zheng <famz@redhat.com> > Date: Wed Sep 24 15:21:41 2014 +0800 > > virtio-scsi: Add VirtIOSCSIVring in VirtIOSCSIReq > > The include/hw/virtio/dataplane/vring.h header is indirectly included > by hw/virtio/virtio-pci.c. Why don't you move all this target dependent > helpers to another header ? Ah, this seems to have come in after I hacked on that code - I'll take a look at splitting off the accessors. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c index 5458f9d..eb45a3d 100644 --- a/hw/block/dataplane/virtio-blk.c +++ b/hw/block/dataplane/virtio-blk.c @@ -16,6 +16,7 @@ #include "qemu/iov.h" #include "qemu/thread.h" #include "qemu/error-report.h" +#include "hw/virtio/virtio-access.h" #include "hw/virtio/dataplane/vring.h" #include "block/block.h" #include "hw/virtio/virtio-blk.h" @@ -75,7 +76,7 @@ static void complete_request_vring(VirtIOBlockReq *req, unsigned char status) VirtIOBlockDataPlane *s = req->dev->dataplane; stb_p(&req->in->status, status); - vring_push(&req->dev->dataplane->vring, &req->elem, + vring_push(s->vdev, &req->dev->dataplane->vring, &req->elem, req->qiov.size + sizeof(*req->in)); /* Suppress notification to guest by BH and its scheduled diff --git a/hw/scsi/virtio-scsi-dataplane.c b/hw/scsi/virtio-scsi-dataplane.c index b778e05..3e2b706 100644 --- a/hw/scsi/virtio-scsi-dataplane.c +++ b/hw/scsi/virtio-scsi-dataplane.c @@ -81,7 +81,7 @@ VirtIOSCSIReq *virtio_scsi_pop_req_vring(VirtIOSCSI *s, void virtio_scsi_vring_push_notify(VirtIOSCSIReq *req) { - vring_push(&req->vring->vring, &req->elem, + vring_push((VirtIODevice *)req->dev, &req->vring->vring, &req->elem, req->qsgl.size + req->resp_iov.size); event_notifier_set(&req->vring->guest_notifier); } diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs index d21c397..19b224a 100644 --- a/hw/virtio/Makefile.objs +++ b/hw/virtio/Makefile.objs @@ -2,7 +2,7 @@ common-obj-y += virtio-rng.o common-obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o common-obj-y += virtio-bus.o common-obj-y += virtio-mmio.o -common-obj-$(CONFIG_VIRTIO) += dataplane/ +obj-$(CONFIG_VIRTIO) += dataplane/ obj-y += virtio.o virtio-balloon.o obj-$(CONFIG_LINUX) += vhost.o vhost-backend.o vhost-user.o diff --git a/hw/virtio/dataplane/Makefile.objs b/hw/virtio/dataplane/Makefile.objs index 9a8cfc0..753a9ca 100644 --- a/hw/virtio/dataplane/Makefile.objs +++ b/hw/virtio/dataplane/Makefile.objs @@ -1 +1 @@ -common-obj-y += vring.o +obj-y += vring.o diff --git a/hw/virtio/dataplane/vring.c b/hw/virtio/dataplane/vring.c index b84957f..4624521 100644 --- a/hw/virtio/dataplane/vring.c +++ b/hw/virtio/dataplane/vring.c @@ -18,6 +18,7 @@ #include "hw/hw.h" #include "exec/memory.h" #include "exec/address-spaces.h" +#include "hw/virtio/virtio-access.h" #include "hw/virtio/dataplane/vring.h" #include "qemu/error-report.h" @@ -83,7 +84,7 @@ bool vring_setup(Vring *vring, VirtIODevice *vdev, int n) vring_init(&vring->vr, virtio_queue_get_num(vdev, n), vring_ptr, 4096); vring->last_avail_idx = virtio_queue_get_last_avail_idx(vdev, n); - vring->last_used_idx = vring->vr.used->idx; + vring->last_used_idx = vring_get_used_idx(vdev, vring); vring->signalled_used = 0; vring->signalled_used_valid = false; @@ -104,7 +105,7 @@ void vring_teardown(Vring *vring, VirtIODevice *vdev, int n) void vring_disable_notification(VirtIODevice *vdev, Vring *vring) { if (!(vdev->guest_features[0] & (1 << VIRTIO_RING_F_EVENT_IDX))) { - vring->vr.used->flags |= VRING_USED_F_NO_NOTIFY; + vring_set_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY); } } @@ -117,10 +118,10 @@ bool vring_enable_notification(VirtIODevice *vdev, Vring *vring) if (vdev->guest_features[0] & (1 << VIRTIO_RING_F_EVENT_IDX)) { vring_avail_event(&vring->vr) = vring->vr.avail->idx; } else { - vring->vr.used->flags &= ~VRING_USED_F_NO_NOTIFY; + vring_clear_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY); } smp_mb(); /* ensure update is seen before reading avail_idx */ - return !vring_more_avail(vring); + return !vring_more_avail(vdev, vring); } /* This is stolen from linux/drivers/vhost/vhost.c:vhost_notify() */ @@ -134,12 +135,13 @@ bool vring_should_notify(VirtIODevice *vdev, Vring *vring) smp_mb(); if ((vdev->guest_features[0] & VIRTIO_F_NOTIFY_ON_EMPTY) && - unlikely(vring->vr.avail->idx == vring->last_avail_idx)) { + unlikely(!vring_more_avail(vdev, vring))) { return true; } if (!(vdev->guest_features[0] & VIRTIO_RING_F_EVENT_IDX)) { - return !(vring->vr.avail->flags & VRING_AVAIL_F_NO_INTERRUPT); + return !(vring_get_avail_flags(vdev, vring) & + VRING_AVAIL_F_NO_INTERRUPT); } old = vring->signalled_used; v = vring->signalled_used_valid; @@ -154,15 +156,18 @@ bool vring_should_notify(VirtIODevice *vdev, Vring *vring) } -static int get_desc(Vring *vring, VirtQueueElement *elem, +static int get_desc(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem, struct vring_desc *desc) { unsigned *num; struct iovec *iov; hwaddr *addr; MemoryRegion *mr; + int is_write = virtio_tswap16(vdev, desc->flags) & VRING_DESC_F_WRITE; + uint32_t len = virtio_tswap32(vdev, desc->len); + uint64_t desc_addr = virtio_tswap64(vdev, desc->addr); - if (desc->flags & VRING_DESC_F_WRITE) { + if (is_write) { num = &elem->in_num; iov = &elem->in_sg[*num]; addr = &elem->in_addr[*num]; @@ -186,44 +191,45 @@ static int get_desc(Vring *vring, VirtQueueElement *elem, } /* TODO handle non-contiguous memory across region boundaries */ - iov->iov_base = vring_map(&mr, desc->addr, desc->len, - desc->flags & VRING_DESC_F_WRITE); + iov->iov_base = vring_map(&mr, desc_addr, len, is_write); if (!iov->iov_base) { error_report("Failed to map descriptor addr %#" PRIx64 " len %u", - (uint64_t)desc->addr, desc->len); + (uint64_t)desc_addr, len); return -EFAULT; } /* The MemoryRegion is looked up again and unref'ed later, leave the * ref in place. */ - iov->iov_len = desc->len; - *addr = desc->addr; + iov->iov_len = len; + *addr = desc_addr; *num += 1; return 0; } /* This is stolen from linux/drivers/vhost/vhost.c. */ -static int get_indirect(Vring *vring, VirtQueueElement *elem, - struct vring_desc *indirect) +static int get_indirect(VirtIODevice *vdev, Vring *vring, + VirtQueueElement *elem, struct vring_desc *indirect) { struct vring_desc desc; unsigned int i = 0, count, found = 0; int ret; + uint32_t len = virtio_tswap32(vdev, indirect->len); + uint64_t addr = virtio_tswap64(vdev, indirect->addr); /* Sanity check */ - if (unlikely(indirect->len % sizeof(desc))) { + if (unlikely(len % sizeof(desc))) { error_report("Invalid length in indirect descriptor: " "len %#x not multiple of %#zx", - indirect->len, sizeof(desc)); + len, sizeof(desc)); vring->broken = true; return -EFAULT; } - count = indirect->len / sizeof(desc); + count = len / sizeof(desc); /* Buffers are chained via a 16 bit next field, so * we can have at most 2^16 of these. */ if (unlikely(count > USHRT_MAX + 1)) { - error_report("Indirect buffer length too big: %d", indirect->len); + error_report("Indirect buffer length too big: %d", len); vring->broken = true; return -EFAULT; } @@ -234,12 +240,12 @@ static int get_indirect(Vring *vring, VirtQueueElement *elem, /* Translate indirect descriptor */ desc_ptr = vring_map(&mr, - indirect->addr + found * sizeof(desc), + addr + found * sizeof(desc), sizeof(desc), false); if (!desc_ptr) { error_report("Failed to map indirect descriptor " "addr %#" PRIx64 " len %zu", - (uint64_t)indirect->addr + found * sizeof(desc), + (uint64_t)addr + found * sizeof(desc), sizeof(desc)); vring->broken = true; return -EFAULT; @@ -257,19 +263,20 @@ static int get_indirect(Vring *vring, VirtQueueElement *elem, return -EFAULT; } - if (unlikely(desc.flags & VRING_DESC_F_INDIRECT)) { + if (unlikely(virtio_tswap16(vdev, desc.flags) + & VRING_DESC_F_INDIRECT)) { error_report("Nested indirect descriptor"); vring->broken = true; return -EFAULT; } - ret = get_desc(vring, elem, &desc); + ret = get_desc(vdev, vring, elem, &desc); if (ret < 0) { vring->broken |= (ret == -EFAULT); return ret; } - i = desc.next; - } while (desc.flags & VRING_DESC_F_NEXT); + i = virtio_tswap16(vdev, desc.next); + } while (virtio_tswap16(vdev, desc.flags) & VRING_DESC_F_NEXT); return 0; } @@ -320,7 +327,7 @@ int vring_pop(VirtIODevice *vdev, Vring *vring, /* Check it isn't doing very strange things with descriptor numbers. */ last_avail_idx = vring->last_avail_idx; - avail_idx = vring->vr.avail->idx; + avail_idx = vring_get_avail_idx(vdev, vring); barrier(); /* load indices now and not again later */ if (unlikely((uint16_t)(avail_idx - last_avail_idx) > num)) { @@ -341,7 +348,7 @@ int vring_pop(VirtIODevice *vdev, Vring *vring, /* Grab the next descriptor number they're advertising, and increment * the index we've seen. */ - head = vring->vr.avail->ring[last_avail_idx % num]; + head = vring_get_avail_ring(vdev, vring, last_avail_idx % num); elem->index = head; @@ -374,21 +381,21 @@ int vring_pop(VirtIODevice *vdev, Vring *vring, /* Ensure descriptor is loaded before accessing fields */ barrier(); - if (desc.flags & VRING_DESC_F_INDIRECT) { - ret = get_indirect(vring, elem, &desc); + if (virtio_tswap16(vdev, desc.flags) & VRING_DESC_F_INDIRECT) { + ret = get_indirect(vdev, vring, elem, &desc); if (ret < 0) { goto out; } continue; } - ret = get_desc(vring, elem, &desc); + ret = get_desc(vdev, vring, elem, &desc); if (ret < 0) { goto out; } - i = desc.next; - } while (desc.flags & VRING_DESC_F_NEXT); + i = virtio_tswap16(vdev, desc.next); + } while (virtio_tswap16(vdev, desc.flags) & VRING_DESC_F_NEXT); /* On success, increment avail index. */ vring->last_avail_idx++; @@ -407,9 +414,9 @@ out: * * Stolen from linux/drivers/vhost/vhost.c. */ -void vring_push(Vring *vring, VirtQueueElement *elem, int len) +void vring_push(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem, + int len) { - struct vring_used_elem *used; unsigned int head = elem->index; uint16_t new; @@ -422,14 +429,16 @@ void vring_push(Vring *vring, VirtQueueElement *elem, int len) /* The virtqueue contains a ring of used buffers. Get a pointer to the * next entry in that used ring. */ - used = &vring->vr.used->ring[vring->last_used_idx % vring->vr.num]; - used->id = head; - used->len = len; + vring_set_used_ring_id(vdev, vring, vring->last_used_idx % vring->vr.num, + head); + vring_set_used_ring_len(vdev, vring, vring->last_used_idx % vring->vr.num, + len); /* Make sure buffer is written before we update index. */ smp_wmb(); - new = vring->vr.used->idx = ++vring->last_used_idx; + new = ++vring->last_used_idx; + vring_set_used_idx(vdev, vring, new); if (unlikely((int16_t)(new - vring->signalled_used) < (uint16_t)1)) { vring->signalled_used_valid = false; } diff --git a/include/hw/virtio/dataplane/vring.h b/include/hw/virtio/dataplane/vring.h index d3e086a..fde15f3 100644 --- a/include/hw/virtio/dataplane/vring.h +++ b/include/hw/virtio/dataplane/vring.h @@ -20,6 +20,7 @@ #include "qemu-common.h" #include "hw/virtio/virtio_ring.h" #include "hw/virtio/virtio.h" +#include "hw/virtio/virtio-access.h" typedef struct { MemoryRegion *mr; /* memory region containing the vring */ @@ -31,15 +32,71 @@ typedef struct { bool broken; /* was there a fatal error? */ } Vring; +static inline uint16_t vring_get_used_idx(VirtIODevice *vdev, Vring *vring) +{ + return virtio_tswap16(vdev, vring->vr.used->idx); +} + +static inline void vring_set_used_idx(VirtIODevice *vdev, Vring *vring, + uint16_t idx) +{ + vring->vr.used->idx = virtio_tswap16(vdev, idx); +} + +static inline uint16_t vring_get_avail_idx(VirtIODevice *vdev, Vring *vring) +{ + return virtio_tswap16(vdev, vring->vr.avail->idx); +} + +static inline uint16_t vring_get_avail_ring(VirtIODevice *vdev, Vring *vring, + int i) +{ + return virtio_tswap16(vdev, vring->vr.avail->ring[i]); +} + +static inline void vring_set_used_ring_id(VirtIODevice *vdev, Vring *vring, + int i, uint32_t id) +{ + vring->vr.used->ring[i].id = virtio_tswap32(vdev, id); +} + +static inline void vring_set_used_ring_len(VirtIODevice *vdev, Vring *vring, + int i, uint32_t len) +{ + vring->vr.used->ring[i].len = virtio_tswap32(vdev, len); +} + +static inline uint16_t vring_get_used_flags(VirtIODevice *vdev, Vring *vring) +{ + return virtio_tswap16(vdev, vring->vr.used->flags); +} + +static inline uint16_t vring_get_avail_flags(VirtIODevice *vdev, Vring *vring) +{ + return virtio_tswap16(vdev, vring->vr.avail->flags); +} + +static inline void vring_set_used_flags(VirtIODevice *vdev, Vring *vring, + uint16_t flags) +{ + vring->vr.used->flags |= virtio_tswap16(vdev, flags); +} + +static inline void vring_clear_used_flags(VirtIODevice *vdev, Vring *vring, + uint16_t flags) +{ + vring->vr.used->flags &= virtio_tswap16(vdev, ~flags); +} + static inline unsigned int vring_get_num(Vring *vring) { return vring->vr.num; } /* Are there more descriptors available? */ -static inline bool vring_more_avail(Vring *vring) +static inline bool vring_more_avail(VirtIODevice *vdev, Vring *vring) { - return vring->vr.avail->idx != vring->last_avail_idx; + return vring_get_avail_idx(vdev, vring) != vring->last_avail_idx; } /* Fail future vring_pop() and vring_push() calls until reset */ @@ -54,6 +111,7 @@ void vring_disable_notification(VirtIODevice *vdev, Vring *vring); bool vring_enable_notification(VirtIODevice *vdev, Vring *vring); bool vring_should_notify(VirtIODevice *vdev, Vring *vring); int vring_pop(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem); -void vring_push(Vring *vring, VirtQueueElement *elem, int len); +void vring_push(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem, + int len); #endif /* VRING_H */
Handle endianness conversion for virtio-1 virtqueues correctly. Note that dataplane now needs to be built per-target. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> --- hw/block/dataplane/virtio-blk.c | 3 +- hw/scsi/virtio-scsi-dataplane.c | 2 +- hw/virtio/Makefile.objs | 2 +- hw/virtio/dataplane/Makefile.objs | 2 +- hw/virtio/dataplane/vring.c | 85 +++++++++++++++++++---------------- include/hw/virtio/dataplane/vring.h | 64 ++++++++++++++++++++++++-- 6 files changed, 113 insertions(+), 45 deletions(-)