From nobody Mon Feb 9 00:19:39 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1503603852840437.0948831365273; Thu, 24 Aug 2017 12:44:12 -0700 (PDT) Received: from localhost ([::1]:50186 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dky31-0008EB-Ef for importer@patchew.org; Thu, 24 Aug 2017 15:44:11 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52361) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dkxo3-0002XS-6A for qemu-devel@nongnu.org; Thu, 24 Aug 2017 15:28:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dkxo1-0004tx-Rh for qemu-devel@nongnu.org; Thu, 24 Aug 2017 15:28:43 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33704) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dkxo1-0004sF-IE for qemu-devel@nongnu.org; Thu, 24 Aug 2017 15:28:41 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 88CF51F56A; Thu, 24 Aug 2017 19:28:40 +0000 (UTC) Received: from dgilbert-t530.redhat.com (ovpn-117-165.ams2.redhat.com [10.36.117.165]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4AED117CC4; Thu, 24 Aug 2017 19:28:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 88CF51F56A Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=dgilbert@redhat.com From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, maxime.coquelin@redhat.com, a.perevalov@samsung.com, mst@redhat.com, marcandre.lureau@redhat.com Date: Thu, 24 Aug 2017 20:27:12 +0100 Message-Id: <20170824192730.8440-15-dgilbert@redhat.com> In-Reply-To: <20170824192730.8440-1-dgilbert@redhat.com> References: <20170824192730.8440-1-dgilbert@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Thu, 24 Aug 2017 19:28:40 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [RFC v2 14/32] vhost+postcopy: Transmit 'listen' to client X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lvivier@redhat.com, aarcange@redhat.com, felipe@nutanix.com, peterx@redhat.com, quintela@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: "Dr. David Alan Gilbert" Notify the vhost-user client on reception of the 'postcopy-listen' event from the source. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Marc-Andr=C3=A9 Lureau --- contrib/libvhost-user/libvhost-user.c | 21 +++++++++++++++++++++ contrib/libvhost-user/libvhost-user.h | 2 ++ docs/interop/vhost-user.txt | 6 ++++++ hw/virtio/trace-events | 3 +++ hw/virtio/vhost-user.c | 30 ++++++++++++++++++++++++++++++ migration/postcopy-ram.h | 1 + migration/savevm.c | 7 +++++++ 7 files changed, 70 insertions(+) diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/= libvhost-user.c index f9b5b12b28..e8accf11db 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -15,7 +15,9 @@ =20 #include #include +#include #include +#include #include =20 #include "qemu/atomic.h" @@ -64,6 +66,7 @@ vu_request_to_string(int req) REQ(VHOST_USER_IOTLB_MSG), REQ(VHOST_USER_SET_VRING_ENDIAN), REQ(VHOST_USER_POSTCOPY_ADVISE), + REQ(VHOST_USER_POSTCOPY_LISTEN), REQ(VHOST_USER_MAX), }; #undef REQ @@ -802,6 +805,22 @@ out: } =20 static bool +vu_set_postcopy_listen(VuDev *dev, VhostUserMsg *vmsg) +{ + vmsg->payload.u64 =3D -1; + vmsg->size =3D sizeof(vmsg->payload.u64); + + if (dev->nregions) { + vu_panic(dev, "Regions already registered at postcopy-listen"); + return true; + } + dev->postcopy_listening =3D true; + + vmsg->flags =3D VHOST_USER_VERSION | VHOST_USER_REPLY_MASK; + vmsg->payload.u64 =3D 0; /* Success */ + return true; +} +static bool vu_process_message(VuDev *dev, VhostUserMsg *vmsg) { int do_reply =3D 0; @@ -868,6 +887,8 @@ vu_process_message(VuDev *dev, VhostUserMsg *vmsg) break; case VHOST_USER_POSTCOPY_ADVISE: return vu_set_postcopy_advise(dev, vmsg); + case VHOST_USER_POSTCOPY_LISTEN: + return vu_set_postcopy_listen(dev, vmsg); default: vmsg_close_fds(vmsg); vu_panic(dev, "Unhandled request: %d", vmsg->request); diff --git a/contrib/libvhost-user/libvhost-user.h b/contrib/libvhost-user/= libvhost-user.h index 3e8efdd919..29c11ba56c 100644 --- a/contrib/libvhost-user/libvhost-user.h +++ b/contrib/libvhost-user/libvhost-user.h @@ -67,6 +67,7 @@ typedef enum VhostUserRequest { VHOST_USER_IOTLB_MSG =3D 22, VHOST_USER_SET_VRING_ENDIAN =3D 23, VHOST_USER_POSTCOPY_ADVISE =3D 24, + VHOST_USER_POSTCOPY_LISTEN =3D 25, VHOST_USER_MAX } VhostUserRequest; =20 @@ -237,6 +238,7 @@ struct VuDev { =20 /* Postcopy data */ int postcopy_ufd; + bool postcopy_listening; }; =20 typedef struct VuVirtqElement { diff --git a/docs/interop/vhost-user.txt b/docs/interop/vhost-user.txt index dad2a1b343..73c3dd74db 100644 --- a/docs/interop/vhost-user.txt +++ b/docs/interop/vhost-user.txt @@ -615,6 +615,12 @@ Master message types the slave must open a userfaultfd for later use. Note that at this stage the migration is still in precopy mode. =20 + * VHOST_USER_POSTCOPY_LISTEN + Id: 25 + Master payload: N/A + + Master advises slave that a transition to postcopy mode has happened. + Slave message types ------------------- =20 diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events index 775461ae98..f736c7c84f 100644 --- a/hw/virtio/trace-events +++ b/hw/virtio/trace-events @@ -1,5 +1,8 @@ # See docs/devel/tracing.txt for syntax documentation. =20 +# hw/virtio/vhost-user.c +vhost_user_postcopy_listen(void) "" + # hw/virtio/virtio.c virtqueue_alloc_element(void *elem, size_t sz, unsigned in_num, unsigned o= ut_num) "elem %p size %zd in_num %u out_num %u" virtqueue_fill(void *vq, const void *elem, unsigned int len, unsigned int = idx) "vq %p elem %p len %u idx %u" diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index b7898f8939..9178271ab2 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -69,6 +69,7 @@ typedef enum VhostUserRequest { VHOST_USER_IOTLB_MSG =3D 22, VHOST_USER_SET_VRING_ENDIAN =3D 23, VHOST_USER_POSTCOPY_ADVISE =3D 24, + VHOST_USER_POSTCOPY_LISTEN =3D 25, VHOST_USER_MAX } VhostUserRequest; =20 @@ -788,6 +789,32 @@ static int vhost_user_postcopy_advise(struct vhost_dev= *dev, Error **errp) return 0; } =20 +/* + * Called at the switch to postcopy on reception of the 'listen' command. + */ +static int vhost_user_postcopy_listen(struct vhost_dev *dev, Error **errp) +{ + int ret; + VhostUserMsg msg =3D { + .request =3D VHOST_USER_POSTCOPY_LISTEN, + .flags =3D VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK, + }; + + trace_vhost_user_postcopy_listen(); + if (vhost_user_write(dev, &msg, NULL, 0) < 0) { + error_setg(errp, "Failed to send postcopy_listen to vhost"); + return -1; + } + + ret =3D process_message_reply(dev, &msg); + if (ret) { + error_setg(errp, "Failed to receive reply to postcopy_listen"); + return ret; + } + + return 0; +} + static int vhost_user_postcopy_notifier(NotifierWithReturn *notifier, void *opaque) { @@ -810,6 +837,9 @@ static int vhost_user_postcopy_notifier(NotifierWithRet= urn *notifier, case POSTCOPY_NOTIFY_INBOUND_ADVISE: return vhost_user_postcopy_advise(dev, pnd->errp); =20 + case POSTCOPY_NOTIFY_INBOUND_LISTEN: + return vhost_user_postcopy_listen(dev, pnd->errp); + default: /* We ignore notifications we don't know */ break; diff --git a/migration/postcopy-ram.h b/migration/postcopy-ram.h index 28c216cc7a..873c147b68 100644 --- a/migration/postcopy-ram.h +++ b/migration/postcopy-ram.h @@ -129,6 +129,7 @@ void postcopy_infrastructure_init(void); enum PostcopyNotifyReason { POSTCOPY_NOTIFY_PROBE =3D 0, POSTCOPY_NOTIFY_INBOUND_ADVISE, + POSTCOPY_NOTIFY_INBOUND_LISTEN, }; =20 struct PostcopyNotifyData { diff --git a/migration/savevm.c b/migration/savevm.c index d35911731d..72f084e10d 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -1557,6 +1557,8 @@ static int loadvm_postcopy_handle_listen(MigrationInc= omingState *mis) { PostcopyState ps =3D postcopy_state_set(POSTCOPY_INCOMING_LISTENING); trace_loadvm_postcopy_handle_listen(); + Error *local_err =3D NULL; + if (ps !=3D POSTCOPY_INCOMING_ADVISE && ps !=3D POSTCOPY_INCOMING_DISC= ARD) { error_report("CMD_POSTCOPY_LISTEN in wrong postcopy state (%d)", p= s); return -1; @@ -1578,6 +1580,11 @@ static int loadvm_postcopy_handle_listen(MigrationIn= comingState *mis) return -1; } =20 + if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_LISTEN, &local_err)) { + error_report_err(local_err); + return -1; + } + if (mis->have_listen_thread) { error_report("CMD_POSTCOPY_RAM_LISTEN already has a listen thread"= ); return -1; --=20 2.13.5