From patchwork Wed Sep 11 14:36:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 11141213 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7D287912 for ; Wed, 11 Sep 2019 14:38:29 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4D3C12053B for ; Wed, 11 Sep 2019 14:38:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=citrix.com header.i=@citrix.com header.b="QBKgpEKQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4D3C12053B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=citrix.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1i83jR-0005mU-Qu; Wed, 11 Sep 2019 14:36:29 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1i83jQ-0005mH-FL for xen-devel@lists.xenproject.org; Wed, 11 Sep 2019 14:36:28 +0000 X-Inumbo-ID: 8711dc60-d4a1-11e9-b299-bc764e2007e4 Received: from esa1.hc3370-68.iphmx.com (unknown [216.71.145.142]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 8711dc60-d4a1-11e9-b299-bc764e2007e4; Wed, 11 Sep 2019 14:36:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1568212583; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=2eLRyJRvHEIZADs9TRMEGf4YwasJRDQ8z8KRoRRuZjg=; b=QBKgpEKQ6UU3bfy4FyQ/R48rfOumv9qiZQLDjRCUzhxMvaMzLmlC9y0J 6ssMPeDVUQ5q0NOzCxOeBd3ueWw4iYqD8vnR7kihu/hwRf3alOQWHinLH 8BGcZCElO8GGi19JH75RfmZsA0kYo4xetr6YbG3ZsSbxl5Yj7Nf1M3P7j s=; Authentication-Results: esa1.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none; spf=None smtp.pra=paul.durrant@citrix.com; spf=Pass smtp.mailfrom=Paul.Durrant@citrix.com; spf=None smtp.helo=postmaster@mail.citrix.com Received-SPF: None (esa1.hc3370-68.iphmx.com: no sender authenticity information available from domain of paul.durrant@citrix.com) identity=pra; client-ip=162.221.158.21; receiver=esa1.hc3370-68.iphmx.com; envelope-from="Paul.Durrant@citrix.com"; x-sender="paul.durrant@citrix.com"; x-conformance=sidf_compatible Received-SPF: Pass (esa1.hc3370-68.iphmx.com: domain of Paul.Durrant@citrix.com designates 162.221.158.21 as permitted sender) identity=mailfrom; client-ip=162.221.158.21; receiver=esa1.hc3370-68.iphmx.com; envelope-from="Paul.Durrant@citrix.com"; x-sender="Paul.Durrant@citrix.com"; x-conformance=sidf_compatible; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133 ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4 ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88 ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83 ~all" Received-SPF: None (esa1.hc3370-68.iphmx.com: no sender authenticity information available from domain of postmaster@mail.citrix.com) identity=helo; client-ip=162.221.158.21; receiver=esa1.hc3370-68.iphmx.com; envelope-from="Paul.Durrant@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: Q1ViSHd8WY124JeLUl9SVBPzBTGF2Vj6GHFsbXCijqRrz6NrS7WHL0rpuAVRKE0L2qovWOnAW9 pzsiTa3LEVV8cTpmOcEH78mH0G8fi5kbyaFv6HrdOlvks01vpxZs1Odr2i6Y23b/r2dgsHvRuz nckf5f5YZl/XTHpO8d/S1YFNkSjAjSWmbffP4hx9hfYQ/tcgu00Dbxp8gONWZFfJsUIhJ+zgVO Jfi/iUzPwCMefxI5ZIBuL4eaCG8FDMpbYKBjdxRmkMsWVt3sUKbAb6ptt/XZyKUE8oD5JAKlJq vQc= X-SBRS: 2.7 X-MesageID: 5488463 X-Ironport-Server: esa1.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.64,493,1559534400"; d="scan'208";a="5488463" From: Paul Durrant To: , Date: Wed, 11 Sep 2019 15:36:17 +0100 Message-ID: <20190911143618.23477-3-paul.durrant@citrix.com> X-Mailer: git-send-email 2.20.1.2.gb21ebb6 In-Reply-To: <20190911143618.23477-1-paul.durrant@citrix.com> References: <20190911143618.23477-1-paul.durrant@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH 2/3] xen: introduce separate XenWatchList for XenDevice objects X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Anthony Perard , Paul Durrant , Stefano Stabellini Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" This patch uses the XenWatchList abstraction to add a separate watch list for each device. This is more scalable than walking a single notifier list for all watches and is also necessary to implement a bug-fix in a subsequent patch. Signed-off-by: Paul Durrant Reviewed-by: Anthony PERARD --- Cc: Stefano Stabellini Cc: Anthony Perard --- hw/xen/trace-events | 2 ++ hw/xen/xen-bus.c | 72 ++++++++++++++++++++++++++++++++-------- include/hw/xen/xen-bus.h | 2 ++ 3 files changed, 62 insertions(+), 14 deletions(-) diff --git a/hw/xen/trace-events b/hw/xen/trace-events index ac8d9c20d2..80ce3dafad 100644 --- a/hw/xen/trace-events +++ b/hw/xen/trace-events @@ -29,6 +29,8 @@ xen_device_backend_changed(const char *type, char *name) "type: %s name: %s" xen_device_frontend_state(const char *type, char *name, const char *state) "type: %s name: %s -> %s" xen_device_frontend_changed(const char *type, char *name) "type: %s name: %s" xen_device_unplug(const char *type, char *name) "type: %s name: %s" +xen_device_add_watch(const char *type, char *name, const char *node, const char *key) "type: %s name: %s node: %s key: %s" +xen_device_remove_watch(const char *type, char *name, const char *node, const char *key) "type: %s name: %s node: %s key: %s" # xen-bus-helper.c xs_node_create(const char *node) "%s" diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c index 28efaccff2..810a4e2df3 100644 --- a/hw/xen/xen-bus.c +++ b/hw/xen/xen-bus.c @@ -235,11 +235,11 @@ static void watch_list_remove(XenWatchList *watch_list, XenWatch *watch, static XenWatch *xen_bus_add_watch(XenBus *xenbus, const char *node, const char *key, XenWatchHandler handler, - void *opaque, Error **errp) + Error **errp) { trace_xen_bus_add_watch(node, key); - return watch_list_add(xenbus->watch_list, node, key, handler, opaque, + return watch_list_add(xenbus->watch_list, node, key, handler, xenbus, errp); } @@ -433,7 +433,7 @@ static void xen_bus_realize(BusState *bus, Error **errp) xenbus->backend_watch = xen_bus_add_watch(xenbus, "", /* domain root node */ - "backend", xen_bus_enumerate, xenbus, &local_err); + "backend", xen_bus_enumerate, &local_err); if (local_err) { /* This need not be treated as a hard error so don't propagate */ error_reportf_err(local_err, @@ -621,6 +621,31 @@ static void xen_device_backend_changed(void *opaque) } } +static XenWatch *xen_device_add_watch(XenDevice *xendev, const char *node, + const char *key, + XenWatchHandler handler, + Error **errp) +{ + const char *type = object_get_typename(OBJECT(xendev)); + + trace_xen_device_add_watch(type, xendev->name, node, key); + + return watch_list_add(xendev->watch_list, node, key, handler, xendev, + errp); +} + +static void xen_device_remove_watch(XenDevice *xendev, XenWatch *watch, + Error **errp) +{ + const char *type = object_get_typename(OBJECT(xendev)); + + trace_xen_device_remove_watch(type, xendev->name, watch->node, + watch->key); + + watch_list_remove(xendev->watch_list, watch, errp); +} + + static void xen_device_backend_create(XenDevice *xendev, Error **errp) { XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); @@ -645,9 +670,9 @@ static void xen_device_backend_create(XenDevice *xendev, Error **errp) } xendev->backend_state_watch = - xen_bus_add_watch(xenbus, xendev->backend_path, - "state", xen_device_backend_changed, - xendev, &local_err); + xen_device_add_watch(xendev, xendev->backend_path, + "state", xen_device_backend_changed, + &local_err); if (local_err) { error_propagate_prepend(errp, local_err, "failed to watch backend state: "); @@ -655,9 +680,9 @@ static void xen_device_backend_create(XenDevice *xendev, Error **errp) } xendev->backend_online_watch = - xen_bus_add_watch(xenbus, xendev->backend_path, - "online", xen_device_backend_changed, - xendev, &local_err); + xen_device_add_watch(xendev, xendev->backend_path, + "online", xen_device_backend_changed, + &local_err); if (local_err) { error_propagate_prepend(errp, local_err, "failed to watch backend online: "); @@ -671,12 +696,12 @@ static void xen_device_backend_destroy(XenDevice *xendev) Error *local_err = NULL; if (xendev->backend_online_watch) { - xen_bus_remove_watch(xenbus, xendev->backend_online_watch, NULL); + xen_device_remove_watch(xendev, xendev->backend_online_watch, NULL); xendev->backend_online_watch = NULL; } if (xendev->backend_state_watch) { - xen_bus_remove_watch(xenbus, xendev->backend_state_watch, NULL); + xen_device_remove_watch(xendev, xendev->backend_state_watch, NULL); xendev->backend_state_watch = NULL; } @@ -812,8 +837,8 @@ static void xen_device_frontend_create(XenDevice *xendev, Error **errp) } xendev->frontend_state_watch = - xen_bus_add_watch(xenbus, xendev->frontend_path, "state", - xen_device_frontend_changed, xendev, &local_err); + xen_device_add_watch(xendev, xendev->frontend_path, "state", + xen_device_frontend_changed, &local_err); if (local_err) { error_propagate_prepend(errp, local_err, "failed to watch frontend state: "); @@ -826,7 +851,8 @@ static void xen_device_frontend_destroy(XenDevice *xendev) Error *local_err = NULL; if (xendev->frontend_state_watch) { - xen_bus_remove_watch(xenbus, xendev->frontend_state_watch, NULL); + xen_device_remove_watch(xendev, xendev->frontend_state_watch, + NULL); xendev->frontend_state_watch = NULL; } @@ -1122,6 +1148,16 @@ static void xen_device_unrealize(DeviceState *dev, Error **errp) xendev->xgth = NULL; } + if (xendev->watch_list) { + watch_list_destroy(xendev->watch_list); + xendev->watch_list = NULL; + } + + if (xendev->xsh) { + xs_close(xendev->xsh); + xendev->xsh = NULL; + } + g_free(xendev->name); xendev->name = NULL; } @@ -1164,6 +1200,14 @@ static void xen_device_realize(DeviceState *dev, Error **errp) trace_xen_device_realize(type, xendev->name); + xendev->xsh = xs_open(0); + if (!xendev->xsh) { + error_setg_errno(errp, errno, "failed xs_open"); + goto unrealize; + } + + xendev->watch_list = watch_list_create(xendev->xsh); + xendev->xgth = xengnttab_open(NULL, 0); if (!xendev->xgth) { error_setg_errno(errp, errno, "failed xengnttab_open"); diff --git a/include/hw/xen/xen-bus.h b/include/hw/xen/xen-bus.h index 88b84e29bb..0d198148f6 100644 --- a/include/hw/xen/xen-bus.h +++ b/include/hw/xen/xen-bus.h @@ -22,6 +22,8 @@ typedef struct XenDevice { DeviceState qdev; domid_t frontend_id; char *name; + struct xs_handle *xsh; + XenWatchList *watch_list; char *backend_path, *frontend_path; enum xenbus_state backend_state, frontend_state; Notifier exit;