| Message ID | 20190116085442.3836-1-jasowang@redhat.com |
|---|---|
| State | Accepted |
| Delegated to: | David Miller |
| Headers | show |
| Series | [net,V4] vhost: log dirty page correctly | expand |
From: Jason Wang <jasowang@redhat.com> Date: Wed, 16 Jan 2019 16:54:42 +0800 > Vhost dirty page logging API is designed to sync through GPA. But we > try to log GIOVA when device IOTLB is enabled. This is wrong and may > lead to missing data after migration. > > To solve this issue, when logging with device IOTLB enabled, we will: > > 1) reuse the device IOTLB translation result of GIOVA->HVA mapping to > get HVA, for writable descriptor, get HVA through iovec. For used > ring update, translate its GIOVA to HVA > 2) traverse the GPA->HVA mapping to get the possible GPA and log > through GPA. Pay attention this reverse mapping is not guaranteed > to be unique, so we should log each possible GPA in this case. > > This fix the failure of scp to guest during migration. In -next, we > will probably support passing GIOVA->GPA instead of GIOVA->HVA. > > Fixes: 6b1e6cc7855b ("vhost: new device IOTLB API") > Reported-by: Jintack Lim <jintack@cs.columbia.edu> > Cc: Jintack Lim <jintack@cs.columbia.edu> > Signed-off-by: Jason Wang <jasowang@redhat.com> Michaell, can I get a review for this please? Thank you.
On Wed, Jan 16, 2019 at 04:54:42PM +0800, Jason Wang wrote: > Vhost dirty page logging API is designed to sync through GPA. But we > try to log GIOVA when device IOTLB is enabled. This is wrong and may > lead to missing data after migration. > > To solve this issue, when logging with device IOTLB enabled, we will: > > 1) reuse the device IOTLB translation result of GIOVA->HVA mapping to > get HVA, for writable descriptor, get HVA through iovec. For used > ring update, translate its GIOVA to HVA > 2) traverse the GPA->HVA mapping to get the possible GPA and log > through GPA. Pay attention this reverse mapping is not guaranteed > to be unique, so we should log each possible GPA in this case. > > This fix the failure of scp to guest during migration. In -next, we > will probably support passing GIOVA->GPA instead of GIOVA->HVA. > > Fixes: 6b1e6cc7855b ("vhost: new device IOTLB API") > Reported-by: Jintack Lim <jintack@cs.columbia.edu> > Cc: Jintack Lim <jintack@cs.columbia.edu> > Signed-off-by: Jason Wang <jasowang@redhat.com> This one looks good to me Acked-by: Michael S. Tsirkin <mst@redhat.com> > --- > Changes from V3: > - make sure each part of the hva was logged when crossing the boundary > of memory regions > Changes from V2: > - check and log the case of range overlap > - remove unnecessary u64 cast > - use smp_wmb() for the case of device IOTLB as well > Changes from V1: > - return error instead of warn > --- > drivers/vhost/net.c | 3 +- > drivers/vhost/vhost.c | 97 ++++++++++++++++++++++++++++++++++++------- > drivers/vhost/vhost.h | 3 +- > 3 files changed, 87 insertions(+), 16 deletions(-) > > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c > index 36f3d0f49e60..bca86bf7189f 100644 > --- a/drivers/vhost/net.c > +++ b/drivers/vhost/net.c > @@ -1236,7 +1236,8 @@ static void handle_rx(struct vhost_net *net) > if (nvq->done_idx > VHOST_NET_BATCH) > vhost_net_signal_used(nvq); > if (unlikely(vq_log)) > - vhost_log_write(vq, vq_log, log, vhost_len); > + vhost_log_write(vq, vq_log, log, vhost_len, > + vq->iov, in); > total_len += vhost_len; > if (unlikely(vhost_exceeds_weight(++recv_pkts, total_len))) { > vhost_poll_queue(&vq->poll); > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index 9f7942cbcbb2..babbb32b9bf0 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -1733,13 +1733,87 @@ static int log_write(void __user *log_base, > return r; > } > > +static int log_write_hva(struct vhost_virtqueue *vq, u64 hva, u64 len) > +{ > + struct vhost_umem *umem = vq->umem; > + struct vhost_umem_node *u; > + u64 start, end, l, min; > + int r; > + bool hit = false; > + > + while (len) { > + min = len; > + /* More than one GPAs can be mapped into a single HVA. So > + * iterate all possible umems here to be safe. > + */ > + list_for_each_entry(u, &umem->umem_list, link) { > + if (u->userspace_addr > hva - 1 + len || > + u->userspace_addr - 1 + u->size < hva) > + continue; > + start = max(u->userspace_addr, hva); > + end = min(u->userspace_addr - 1 + u->size, > + hva - 1 + len); > + l = end - start + 1; > + r = log_write(vq->log_base, > + u->start + start - u->userspace_addr, > + l); > + if (r < 0) > + return r; > + hit = true; > + min = min(l, min); > + } > + > + if (!hit) > + return -EFAULT; > + > + len -= min; > + hva += min; > + } > + > + return 0; > +} > + > +static int log_used(struct vhost_virtqueue *vq, u64 used_offset, u64 len) > +{ > + struct iovec iov[64]; > + int i, ret; > + > + if (!vq->iotlb) > + return log_write(vq->log_base, vq->log_addr + used_offset, len); > + > + ret = translate_desc(vq, (uintptr_t)vq->used + used_offset, > + len, iov, 64, VHOST_ACCESS_WO); > + if (ret) > + return ret; > + > + for (i = 0; i < ret; i++) { > + ret = log_write_hva(vq, (uintptr_t)iov[i].iov_base, > + iov[i].iov_len); > + if (ret) > + return ret; > + } > + > + return 0; > +} > + > int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, > - unsigned int log_num, u64 len) > + unsigned int log_num, u64 len, struct iovec *iov, int count) > { > int i, r; > > /* Make sure data written is seen before log. */ > smp_wmb(); > + > + if (vq->iotlb) { > + for (i = 0; i < count; i++) { > + r = log_write_hva(vq, (uintptr_t)iov[i].iov_base, > + iov[i].iov_len); > + if (r < 0) > + return r; > + } > + return 0; > + } > + > for (i = 0; i < log_num; ++i) { > u64 l = min(log[i].len, len); > r = log_write(vq->log_base, log[i].addr, l); > @@ -1769,9 +1843,8 @@ static int vhost_update_used_flags(struct vhost_virtqueue *vq) > smp_wmb(); > /* Log used flag write. */ > used = &vq->used->flags; > - log_write(vq->log_base, vq->log_addr + > - (used - (void __user *)vq->used), > - sizeof vq->used->flags); > + log_used(vq, (used - (void __user *)vq->used), > + sizeof vq->used->flags); > if (vq->log_ctx) > eventfd_signal(vq->log_ctx, 1); > } > @@ -1789,9 +1862,8 @@ static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event) > smp_wmb(); > /* Log avail event write */ > used = vhost_avail_event(vq); > - log_write(vq->log_base, vq->log_addr + > - (used - (void __user *)vq->used), > - sizeof *vhost_avail_event(vq)); > + log_used(vq, (used - (void __user *)vq->used), > + sizeof *vhost_avail_event(vq)); > if (vq->log_ctx) > eventfd_signal(vq->log_ctx, 1); > } > @@ -2191,10 +2263,8 @@ static int __vhost_add_used_n(struct vhost_virtqueue *vq, > /* Make sure data is seen before log. */ > smp_wmb(); > /* Log used ring entry write. */ > - log_write(vq->log_base, > - vq->log_addr + > - ((void __user *)used - (void __user *)vq->used), > - count * sizeof *used); > + log_used(vq, ((void __user *)used - (void __user *)vq->used), > + count * sizeof *used); > } > old = vq->last_used_idx; > new = (vq->last_used_idx += count); > @@ -2236,9 +2306,8 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads, > /* Make sure used idx is seen before log. */ > smp_wmb(); > /* Log used index update. */ > - log_write(vq->log_base, > - vq->log_addr + offsetof(struct vring_used, idx), > - sizeof vq->used->idx); > + log_used(vq, offsetof(struct vring_used, idx), > + sizeof vq->used->idx); > if (vq->log_ctx) > eventfd_signal(vq->log_ctx, 1); > } > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h > index 466ef7542291..1b675dad5e05 100644 > --- a/drivers/vhost/vhost.h > +++ b/drivers/vhost/vhost.h > @@ -205,7 +205,8 @@ bool vhost_vq_avail_empty(struct vhost_dev *, struct vhost_virtqueue *); > bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *); > > int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, > - unsigned int log_num, u64 len); > + unsigned int log_num, u64 len, > + struct iovec *iov, int count); > int vq_iotlb_prefetch(struct vhost_virtqueue *vq); > > struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type); > -- > 2.17.1
From: Jason Wang <jasowang@redhat.com> Date: Wed, 16 Jan 2019 16:54:42 +0800 > Vhost dirty page logging API is designed to sync through GPA. But we > try to log GIOVA when device IOTLB is enabled. This is wrong and may > lead to missing data after migration. > > To solve this issue, when logging with device IOTLB enabled, we will: > > 1) reuse the device IOTLB translation result of GIOVA->HVA mapping to > get HVA, for writable descriptor, get HVA through iovec. For used > ring update, translate its GIOVA to HVA > 2) traverse the GPA->HVA mapping to get the possible GPA and log > through GPA. Pay attention this reverse mapping is not guaranteed > to be unique, so we should log each possible GPA in this case. > > This fix the failure of scp to guest during migration. In -next, we > will probably support passing GIOVA->GPA instead of GIOVA->HVA. > > Fixes: 6b1e6cc7855b ("vhost: new device IOTLB API") > Reported-by: Jintack Lim <jintack@cs.columbia.edu> > Cc: Jintack Lim <jintack@cs.columbia.edu> > Signed-off-by: Jason Wang <jasowang@redhat.com> Applied and queued up for -stable.
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 36f3d0f49e60..bca86bf7189f 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -1236,7 +1236,8 @@ static void handle_rx(struct vhost_net *net) if (nvq->done_idx > VHOST_NET_BATCH) vhost_net_signal_used(nvq); if (unlikely(vq_log)) - vhost_log_write(vq, vq_log, log, vhost_len); + vhost_log_write(vq, vq_log, log, vhost_len, + vq->iov, in); total_len += vhost_len; if (unlikely(vhost_exceeds_weight(++recv_pkts, total_len))) { vhost_poll_queue(&vq->poll); diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 9f7942cbcbb2..babbb32b9bf0 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1733,13 +1733,87 @@ static int log_write(void __user *log_base, return r; } +static int log_write_hva(struct vhost_virtqueue *vq, u64 hva, u64 len) +{ + struct vhost_umem *umem = vq->umem; + struct vhost_umem_node *u; + u64 start, end, l, min; + int r; + bool hit = false; + + while (len) { + min = len; + /* More than one GPAs can be mapped into a single HVA. So + * iterate all possible umems here to be safe. + */ + list_for_each_entry(u, &umem->umem_list, link) { + if (u->userspace_addr > hva - 1 + len || + u->userspace_addr - 1 + u->size < hva) + continue; + start = max(u->userspace_addr, hva); + end = min(u->userspace_addr - 1 + u->size, + hva - 1 + len); + l = end - start + 1; + r = log_write(vq->log_base, + u->start + start - u->userspace_addr, + l); + if (r < 0) + return r; + hit = true; + min = min(l, min); + } + + if (!hit) + return -EFAULT; + + len -= min; + hva += min; + } + + return 0; +} + +static int log_used(struct vhost_virtqueue *vq, u64 used_offset, u64 len) +{ + struct iovec iov[64]; + int i, ret; + + if (!vq->iotlb) + return log_write(vq->log_base, vq->log_addr + used_offset, len); + + ret = translate_desc(vq, (uintptr_t)vq->used + used_offset, + len, iov, 64, VHOST_ACCESS_WO); + if (ret) + return ret; + + for (i = 0; i < ret; i++) { + ret = log_write_hva(vq, (uintptr_t)iov[i].iov_base, + iov[i].iov_len); + if (ret) + return ret; + } + + return 0; +} + int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, - unsigned int log_num, u64 len) + unsigned int log_num, u64 len, struct iovec *iov, int count) { int i, r; /* Make sure data written is seen before log. */ smp_wmb(); + + if (vq->iotlb) { + for (i = 0; i < count; i++) { + r = log_write_hva(vq, (uintptr_t)iov[i].iov_base, + iov[i].iov_len); + if (r < 0) + return r; + } + return 0; + } + for (i = 0; i < log_num; ++i) { u64 l = min(log[i].len, len); r = log_write(vq->log_base, log[i].addr, l); @@ -1769,9 +1843,8 @@ static int vhost_update_used_flags(struct vhost_virtqueue *vq) smp_wmb(); /* Log used flag write. */ used = &vq->used->flags; - log_write(vq->log_base, vq->log_addr + - (used - (void __user *)vq->used), - sizeof vq->used->flags); + log_used(vq, (used - (void __user *)vq->used), + sizeof vq->used->flags); if (vq->log_ctx) eventfd_signal(vq->log_ctx, 1); } @@ -1789,9 +1862,8 @@ static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event) smp_wmb(); /* Log avail event write */ used = vhost_avail_event(vq); - log_write(vq->log_base, vq->log_addr + - (used - (void __user *)vq->used), - sizeof *vhost_avail_event(vq)); + log_used(vq, (used - (void __user *)vq->used), + sizeof *vhost_avail_event(vq)); if (vq->log_ctx) eventfd_signal(vq->log_ctx, 1); } @@ -2191,10 +2263,8 @@ static int __vhost_add_used_n(struct vhost_virtqueue *vq, /* Make sure data is seen before log. */ smp_wmb(); /* Log used ring entry write. */ - log_write(vq->log_base, - vq->log_addr + - ((void __user *)used - (void __user *)vq->used), - count * sizeof *used); + log_used(vq, ((void __user *)used - (void __user *)vq->used), + count * sizeof *used); } old = vq->last_used_idx; new = (vq->last_used_idx += count); @@ -2236,9 +2306,8 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads, /* Make sure used idx is seen before log. */ smp_wmb(); /* Log used index update. */ - log_write(vq->log_base, - vq->log_addr + offsetof(struct vring_used, idx), - sizeof vq->used->idx); + log_used(vq, offsetof(struct vring_used, idx), + sizeof vq->used->idx); if (vq->log_ctx) eventfd_signal(vq->log_ctx, 1); } diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 466ef7542291..1b675dad5e05 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -205,7 +205,8 @@ bool vhost_vq_avail_empty(struct vhost_dev *, struct vhost_virtqueue *); bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *); int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, - unsigned int log_num, u64 len); + unsigned int log_num, u64 len, + struct iovec *iov, int count); int vq_iotlb_prefetch(struct vhost_virtqueue *vq); struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type);
Vhost dirty page logging API is designed to sync through GPA. But we try to log GIOVA when device IOTLB is enabled. This is wrong and may lead to missing data after migration. To solve this issue, when logging with device IOTLB enabled, we will: 1) reuse the device IOTLB translation result of GIOVA->HVA mapping to get HVA, for writable descriptor, get HVA through iovec. For used ring update, translate its GIOVA to HVA 2) traverse the GPA->HVA mapping to get the possible GPA and log through GPA. Pay attention this reverse mapping is not guaranteed to be unique, so we should log each possible GPA in this case. This fix the failure of scp to guest during migration. In -next, we will probably support passing GIOVA->GPA instead of GIOVA->HVA. Fixes: 6b1e6cc7855b ("vhost: new device IOTLB API") Reported-by: Jintack Lim <jintack@cs.columbia.edu> Cc: Jintack Lim <jintack@cs.columbia.edu> Signed-off-by: Jason Wang <jasowang@redhat.com> --- Changes from V3: - make sure each part of the hva was logged when crossing the boundary of memory regions Changes from V2: - check and log the case of range overlap - remove unnecessary u64 cast - use smp_wmb() for the case of device IOTLB as well Changes from V1: - return error instead of warn --- drivers/vhost/net.c | 3 +- drivers/vhost/vhost.c | 97 ++++++++++++++++++++++++++++++++++++------- drivers/vhost/vhost.h | 3 +- 3 files changed, 87 insertions(+), 16 deletions(-)