|
 |
22c213 |
From ee360b70f179cf540faebe7e55b34e323e2bb179 Mon Sep 17 00:00:00 2001
|
|
|
22c213 |
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
|
|
|
22c213 |
Date: Mon, 27 Jan 2020 19:02:09 +0100
|
|
|
22c213 |
Subject: [PATCH 098/116] libvhost-user: Fix some memtable remap cases
|
|
|
22c213 |
MIME-Version: 1.0
|
|
|
22c213 |
Content-Type: text/plain; charset=UTF-8
|
|
|
22c213 |
Content-Transfer-Encoding: 8bit
|
|
|
22c213 |
|
|
|
22c213 |
RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
|
22c213 |
Message-id: <20200127190227.40942-95-dgilbert@redhat.com>
|
|
|
22c213 |
Patchwork-id: 93548
|
|
|
22c213 |
O-Subject: [RHEL-AV-8.2 qemu-kvm PATCH 094/112] libvhost-user: Fix some memtable remap cases
|
|
|
22c213 |
Bugzilla: 1694164
|
|
|
22c213 |
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
|
|
|
22c213 |
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
|
|
|
22c213 |
RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
|
|
|
22c213 |
|
|
|
22c213 |
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
|
|
|
22c213 |
|
|
|
22c213 |
If a new setmemtable command comes in once the vhost threads are
|
|
|
22c213 |
running, it will remap the guests address space and the threads
|
|
|
22c213 |
will now be looking in the wrong place.
|
|
|
22c213 |
|
|
|
22c213 |
Fortunately we're running this command under lock, so we can
|
|
|
22c213 |
update the queue mappings so that threads will look in the new-right
|
|
|
22c213 |
place.
|
|
|
22c213 |
|
|
|
22c213 |
Note: This doesn't fix things that the threads might be doing
|
|
|
22c213 |
without a lock (e.g. a readv/writev!) That's for another time.
|
|
|
22c213 |
|
|
|
22c213 |
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
|
22c213 |
(cherry picked from commit 49e9ec749d4db62ae51f76354143cee183912a1d)
|
|
|
22c213 |
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
22c213 |
---
|
|
|
22c213 |
contrib/libvhost-user/libvhost-user.c | 33 +++++++++++++++++++++++++--------
|
|
|
22c213 |
contrib/libvhost-user/libvhost-user.h | 3 +++
|
|
|
22c213 |
2 files changed, 28 insertions(+), 8 deletions(-)
|
|
|
22c213 |
|
|
|
22c213 |
diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/libvhost-user.c
|
|
|
22c213 |
index 63e4106..b89bf18 100644
|
|
|
22c213 |
--- a/contrib/libvhost-user/libvhost-user.c
|
|
|
22c213 |
+++ b/contrib/libvhost-user/libvhost-user.c
|
|
|
22c213 |
@@ -565,6 +565,21 @@ vu_reset_device_exec(VuDev *dev, VhostUserMsg *vmsg)
|
|
|
22c213 |
}
|
|
|
22c213 |
|
|
|
22c213 |
static bool
|
|
|
22c213 |
+map_ring(VuDev *dev, VuVirtq *vq)
|
|
|
22c213 |
+{
|
|
|
22c213 |
+ vq->vring.desc = qva_to_va(dev, vq->vra.desc_user_addr);
|
|
|
22c213 |
+ vq->vring.used = qva_to_va(dev, vq->vra.used_user_addr);
|
|
|
22c213 |
+ vq->vring.avail = qva_to_va(dev, vq->vra.avail_user_addr);
|
|
|
22c213 |
+
|
|
|
22c213 |
+ DPRINT("Setting virtq addresses:\n");
|
|
|
22c213 |
+ DPRINT(" vring_desc at %p\n", vq->vring.desc);
|
|
|
22c213 |
+ DPRINT(" vring_used at %p\n", vq->vring.used);
|
|
|
22c213 |
+ DPRINT(" vring_avail at %p\n", vq->vring.avail);
|
|
|
22c213 |
+
|
|
|
22c213 |
+ return !(vq->vring.desc && vq->vring.used && vq->vring.avail);
|
|
|
22c213 |
+}
|
|
|
22c213 |
+
|
|
|
22c213 |
+static bool
|
|
|
22c213 |
vu_set_mem_table_exec_postcopy(VuDev *dev, VhostUserMsg *vmsg)
|
|
|
22c213 |
{
|
|
|
22c213 |
int i;
|
|
|
22c213 |
@@ -767,6 +782,14 @@ vu_set_mem_table_exec(VuDev *dev, VhostUserMsg *vmsg)
|
|
|
22c213 |
close(vmsg->fds[i]);
|
|
|
22c213 |
}
|
|
|
22c213 |
|
|
|
22c213 |
+ for (i = 0; i < dev->max_queues; i++) {
|
|
|
22c213 |
+ if (dev->vq[i].vring.desc) {
|
|
|
22c213 |
+ if (map_ring(dev, &dev->vq[i])) {
|
|
|
22c213 |
+ vu_panic(dev, "remaping queue %d during setmemtable", i);
|
|
|
22c213 |
+ }
|
|
|
22c213 |
+ }
|
|
|
22c213 |
+ }
|
|
|
22c213 |
+
|
|
|
22c213 |
return false;
|
|
|
22c213 |
}
|
|
|
22c213 |
|
|
|
22c213 |
@@ -853,18 +876,12 @@ vu_set_vring_addr_exec(VuDev *dev, VhostUserMsg *vmsg)
|
|
|
22c213 |
DPRINT(" avail_user_addr: 0x%016" PRIx64 "\n", vra->avail_user_addr);
|
|
|
22c213 |
DPRINT(" log_guest_addr: 0x%016" PRIx64 "\n", vra->log_guest_addr);
|
|
|
22c213 |
|
|
|
22c213 |
+ vq->vra = *vra;
|
|
|
22c213 |
vq->vring.flags = vra->flags;
|
|
|
22c213 |
- vq->vring.desc = qva_to_va(dev, vra->desc_user_addr);
|
|
|
22c213 |
- vq->vring.used = qva_to_va(dev, vra->used_user_addr);
|
|
|
22c213 |
- vq->vring.avail = qva_to_va(dev, vra->avail_user_addr);
|
|
|
22c213 |
vq->vring.log_guest_addr = vra->log_guest_addr;
|
|
|
22c213 |
|
|
|
22c213 |
- DPRINT("Setting virtq addresses:\n");
|
|
|
22c213 |
- DPRINT(" vring_desc at %p\n", vq->vring.desc);
|
|
|
22c213 |
- DPRINT(" vring_used at %p\n", vq->vring.used);
|
|
|
22c213 |
- DPRINT(" vring_avail at %p\n", vq->vring.avail);
|
|
|
22c213 |
|
|
|
22c213 |
- if (!(vq->vring.desc && vq->vring.used && vq->vring.avail)) {
|
|
|
22c213 |
+ if (map_ring(dev, vq)) {
|
|
|
22c213 |
vu_panic(dev, "Invalid vring_addr message");
|
|
|
22c213 |
return false;
|
|
|
22c213 |
}
|
|
|
22c213 |
diff --git a/contrib/libvhost-user/libvhost-user.h b/contrib/libvhost-user/libvhost-user.h
|
|
|
22c213 |
index 1844b6f..5cb7708 100644
|
|
|
22c213 |
--- a/contrib/libvhost-user/libvhost-user.h
|
|
|
22c213 |
+++ b/contrib/libvhost-user/libvhost-user.h
|
|
|
22c213 |
@@ -327,6 +327,9 @@ typedef struct VuVirtq {
|
|
|
22c213 |
int err_fd;
|
|
|
22c213 |
unsigned int enable;
|
|
|
22c213 |
bool started;
|
|
|
22c213 |
+
|
|
|
22c213 |
+ /* Guest addresses of our ring */
|
|
|
22c213 |
+ struct vhost_vring_addr vra;
|
|
|
22c213 |
} VuVirtq;
|
|
|
22c213 |
|
|
|
22c213 |
enum VuWatchCondtion {
|
|
|
22c213 |
--
|
|
|
22c213 |
1.8.3.1
|
|
|
22c213 |
|