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Thu, 23 Jan 2020 12:01:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579780863; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UGv6zNVxuKuym9ksnQl50L+mnvqmK9zVXfAcevoknPM=; b=FmfofEkej5usSE6zyZGghb+5Uia/nFTijQq0IcOd3i5KthJdmrt0EBuSFqC1RpYKgIP1yl rj647GvhvyRMZnhGUIhGmFw1YV6O5hFh8hL31d5m9OnKgyjAFIG+ACFBXrzlLnVu1IjQqW 1Uuqs/j1zILKVuQha6JoYrVwQ7yNIsM= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com Subject: [PULL 093/111] libvhost-user: Fix some memtable remap cases Date: Thu, 23 Jan 2020 11:58:23 +0000 Message-Id: <20200123115841.138849-94-dgilbert@redhat.com> In-Reply-To: <20200123115841.138849-1-dgilbert@redhat.com> References: <20200123115841.138849-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: sfrLAFlQOK6tVF1Y6piMPw-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: "Dr. David Alan Gilbert" If a new setmemtable command comes in once the vhost threads are running, it will remap the guests address space and the threads will now be looking in the wrong place. Fortunately we're running this command under lock, so we can update the queue mappings so that threads will look in the new-right place. Note: This doesn't fix things that the threads might be doing without a lock (e.g. a readv/writev!) That's for another time. Signed-off-by: Dr. David Alan Gilbert --- contrib/libvhost-user/libvhost-user.c | 33 ++++++++++++++++++++------- contrib/libvhost-user/libvhost-user.h | 3 +++ 2 files changed, 28 insertions(+), 8 deletions(-) diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/= libvhost-user.c index 63e41062a4..b89bf18501 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -564,6 +564,21 @@ vu_reset_device_exec(VuDev *dev, VhostUserMsg *vmsg) return false; } =20 +static bool +map_ring(VuDev *dev, VuVirtq *vq) +{ + vq->vring.desc =3D qva_to_va(dev, vq->vra.desc_user_addr); + vq->vring.used =3D qva_to_va(dev, vq->vra.used_user_addr); + vq->vring.avail =3D qva_to_va(dev, vq->vra.avail_user_addr); + + DPRINT("Setting virtq addresses:\n"); + DPRINT(" vring_desc at %p\n", vq->vring.desc); + DPRINT(" vring_used at %p\n", vq->vring.used); + DPRINT(" vring_avail at %p\n", vq->vring.avail); + + return !(vq->vring.desc && vq->vring.used && vq->vring.avail); +} + static bool vu_set_mem_table_exec_postcopy(VuDev *dev, VhostUserMsg *vmsg) { @@ -767,6 +782,14 @@ vu_set_mem_table_exec(VuDev *dev, VhostUserMsg *vmsg) close(vmsg->fds[i]); } =20 + for (i =3D 0; i < dev->max_queues; i++) { + if (dev->vq[i].vring.desc) { + if (map_ring(dev, &dev->vq[i])) { + vu_panic(dev, "remaping queue %d during setmemtable", i); + } + } + } + return false; } =20 @@ -853,18 +876,12 @@ vu_set_vring_addr_exec(VuDev *dev, VhostUserMsg *vmsg) DPRINT(" avail_user_addr: 0x%016" PRIx64 "\n", vra->avail_user_add= r); DPRINT(" log_guest_addr: 0x%016" PRIx64 "\n", vra->log_guest_addr= ); =20 + vq->vra =3D *vra; vq->vring.flags =3D vra->flags; - vq->vring.desc =3D qva_to_va(dev, vra->desc_user_addr); - vq->vring.used =3D qva_to_va(dev, vra->used_user_addr); - vq->vring.avail =3D qva_to_va(dev, vra->avail_user_addr); vq->vring.log_guest_addr =3D vra->log_guest_addr; =20 - DPRINT("Setting virtq addresses:\n"); - DPRINT(" vring_desc at %p\n", vq->vring.desc); - DPRINT(" vring_used at %p\n", vq->vring.used); - DPRINT(" vring_avail at %p\n", vq->vring.avail); =20 - if (!(vq->vring.desc && vq->vring.used && vq->vring.avail)) { + if (map_ring(dev, vq)) { vu_panic(dev, "Invalid vring_addr message"); return false; } diff --git a/contrib/libvhost-user/libvhost-user.h b/contrib/libvhost-user/= libvhost-user.h index 1844b6f8d4..5cb7708559 100644 --- a/contrib/libvhost-user/libvhost-user.h +++ b/contrib/libvhost-user/libvhost-user.h @@ -327,6 +327,9 @@ typedef struct VuVirtq { int err_fd; unsigned int enable; bool started; + + /* Guest addresses of our ring */ + struct vhost_vring_addr vra; } VuVirtq; =20 enum VuWatchCondtion { --=20 2.24.1