From patchwork Mon Mar 20 18:19:08 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 741124 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3vn49V0S3Pz9s7D for ; Tue, 21 Mar 2017 05:24:46 +1100 (AEDT) Received: from localhost ([::1]:34329 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cq1z1-0001oj-II for incoming@patchwork.ozlabs.org; Mon, 20 Mar 2017 14:24:43 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34487) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cq1tt-0006XV-PU for qemu-devel@nongnu.org; Mon, 20 Mar 2017 14:19:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cq1tr-0007jh-Tr for qemu-devel@nongnu.org; Mon, 20 Mar 2017 14:19:25 -0400 Received: from mail.kernel.org ([198.145.29.136]:46138) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cq1tr-0007jD-Jo for qemu-devel@nongnu.org; Mon, 20 Mar 2017 14:19:23 -0400 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8AD9C2038A; Mon, 20 Mar 2017 18:19:21 +0000 (UTC) Received: from sstabellini-ThinkPad-X260.hsd1.ca.comcast.net (96-82-76-110-static.hfc.comcastbusiness.net [96.82.76.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 16EB120396; Mon, 20 Mar 2017 18:19:20 +0000 (UTC) From: Stefano Stabellini To: qemu-devel@nongnu.org Date: Mon, 20 Mar 2017 11:19:08 -0700 Message-Id: <1490033952-26735-4-git-send-email-sstabellini@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1490033952-26735-1-git-send-email-sstabellini@kernel.org> References: <1490033952-26735-1-git-send-email-sstabellini@kernel.org> X-Virus-Scanned: ClamAV using ClamSMTP X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 198.145.29.136 Subject: [Qemu-devel] [PATCH v4 4/8] xen/9pfs: connect to the frontend 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: jgross@suse.com, sstabellini@kernel.org, groug@kaod.org, Stefano Stabellini , "Aneesh Kumar K.V" , anthony.perard@citrix.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Write the limits of the backend to xenstore. Connect to the frontend. Upon connection, allocate the rings according to the protocol specification. Initialize a QEMUBH to schedule work upon receiving an event channel notification from the frontend. Signed-off-by: Stefano Stabellini CC: anthony.perard@citrix.com CC: jgross@suse.com CC: Aneesh Kumar K.V CC: Greg Kurz --- hw/9pfs/xen-9p-backend.c | 182 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 181 insertions(+), 1 deletion(-) diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c index 960e690..bb0157b 100644 --- a/hw/9pfs/xen-9p-backend.c +++ b/hw/9pfs/xen-9p-backend.c @@ -21,8 +21,41 @@ #define PAGE_SHIFT XC_PAGE_SHIFT DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs); +#define VERSIONS "1" +#define MAX_RINGS 8 +#define MAX_RING_ORDER 8 + +typedef struct Xen9pfsRing { + struct Xen9pfsDev *priv; + + int ref; + xenevtchn_handle *evtchndev; + int evtchn; + int local_port; + int ring_order; + struct xen_9pfs_data_intf *intf; + unsigned char *data; + struct xen_9pfs_data ring; + + struct iovec *sg; + QEMUBH *bh; + + /* local copies, so that we can read/write PDU data directly from + * the ring */ + RING_IDX out_cons, out_size, in_cons; + bool inprogress; +} Xen9pfsRing; + typedef struct Xen9pfsDev { struct XenDevice xendev; /* must be first */ + V9fsState state; + char *path; + char *security_model; + char *tag; + char *id; + + int num_rings; + Xen9pfsRing *rings; } Xen9pfsDev; static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu, @@ -71,22 +104,169 @@ static int xen_9pfs_init(struct XenDevice *xendev) return 0; } +static void xen_9pfs_bh(void *opaque) +{ +} + +static void xen_9pfs_evtchn_event(void *opaque) +{ +} + static int xen_9pfs_free(struct XenDevice *xendev) { - return -1; + int i; + Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev); + + g_free(xen_9pdev->id); + g_free(xen_9pdev->tag); + g_free(xen_9pdev->path); + g_free(xen_9pdev->security_model); + + for (i = 0; i < xen_9pdev->num_rings; i++) { + if (xen_9pdev->rings[i].data != NULL) { + xengnttab_unmap(xen_9pdev->xendev.gnttabdev, + xen_9pdev->rings[i].data, + (1 << xen_9pdev->rings[i].ring_order)); + } + if (xen_9pdev->rings[i].intf != NULL) { + xengnttab_unmap(xen_9pdev->xendev.gnttabdev, + xen_9pdev->rings[i].intf, + 1); + } + if (xen_9pdev->rings[i].evtchndev > 0) { + qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev), + NULL, NULL, NULL); + xenevtchn_unbind(xen_9pdev->rings[i].evtchndev, + xen_9pdev->rings[i].local_port); + } + if (xen_9pdev->rings[i].bh != NULL) { + qemu_bh_delete(xen_9pdev->rings[i].bh); + } + } + g_free(xen_9pdev->rings); + return 0; } static int xen_9pfs_connect(struct XenDevice *xendev) { + int i; + Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev); + V9fsState *s = &xen_9pdev->state; + QemuOpts *fsdev; + + if (xenstore_read_fe_int(&xen_9pdev->xendev, "num-rings", + &xen_9pdev->num_rings) == -1 || + xen_9pdev->num_rings > MAX_RINGS || xen_9pdev->num_rings < 1) { + return -1; + } + + xen_9pdev->rings = g_malloc0(xen_9pdev->num_rings * sizeof(Xen9pfsRing)); + for (i = 0; i < xen_9pdev->num_rings; i++) { + char *str; + int ring_order; + + xen_9pdev->rings[i].priv = xen_9pdev; + xen_9pdev->rings[i].evtchn = -1; + xen_9pdev->rings[i].local_port = -1; + + str = g_strdup_printf("ring-ref%u", i); + if (xenstore_read_fe_int(&xen_9pdev->xendev, str, + &xen_9pdev->rings[i].ref) == -1) { + goto out; + } + g_free(str); + str = g_strdup_printf("event-channel-%u", i); + if (xenstore_read_fe_int(&xen_9pdev->xendev, str, + &xen_9pdev->rings[i].evtchn) == -1) { + goto out; + } + g_free(str); + + xen_9pdev->rings[i].intf = xengnttab_map_grant_ref( + xen_9pdev->xendev.gnttabdev, + xen_9pdev->xendev.dom, + xen_9pdev->rings[i].ref, + PROT_READ | PROT_WRITE); + if (!xen_9pdev->rings[i].intf) { + goto out; + } + ring_order = xen_9pdev->rings[i].intf->ring_order; + if (ring_order > MAX_RING_ORDER) { + goto out; + } + xen_9pdev->rings[i].ring_order = ring_order; + xen_9pdev->rings[i].data = xengnttab_map_domain_grant_refs( + xen_9pdev->xendev.gnttabdev, + (1 << ring_order), + xen_9pdev->xendev.dom, + xen_9pdev->rings[i].intf->ref, + PROT_READ | PROT_WRITE); + if (!xen_9pdev->rings[i].data) { + goto out; + } + xen_9pdev->rings[i].ring.in = xen_9pdev->rings[i].data; + xen_9pdev->rings[i].ring.out = xen_9pdev->rings[i].data + + XEN_FLEX_RING_SIZE(ring_order); + + xen_9pdev->rings[i].bh = qemu_bh_new(xen_9pfs_bh, &xen_9pdev->rings[i]); + xen_9pdev->rings[i].out_cons = 0; + xen_9pdev->rings[i].out_size = 0; + xen_9pdev->rings[i].inprogress = false; + + + xen_9pdev->rings[i].evtchndev = xenevtchn_open(NULL, 0); + if (xen_9pdev->rings[i].evtchndev == NULL) { + goto out; + } + fcntl(xenevtchn_fd(xen_9pdev->rings[i].evtchndev), F_SETFD, FD_CLOEXEC); + xen_9pdev->rings[i].local_port = xenevtchn_bind_interdomain + (xen_9pdev->rings[i].evtchndev, + xendev->dom, + xen_9pdev->rings[i].evtchn); + if (xen_9pdev->rings[i].local_port == -1) { + xen_pv_printf(xendev, 0, + "xenevtchn_bind_interdomain failed port=%d\n", + xen_9pdev->rings[i].evtchn); + goto out; + } + xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port); + qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev), + xen_9pfs_evtchn_event, NULL, &xen_9pdev->rings[i]); + } + + xen_9pdev->security_model = xenstore_read_be_str(xendev, "security_model"); + xen_9pdev->path = xenstore_read_be_str(xendev, "path"); + xen_9pdev->id = s->fsconf.fsdev_id = + g_strdup_printf("xen9p%d", xendev->dev); + xen_9pdev->tag = s->fsconf.tag = xenstore_read_fe_str(xendev, "tag"); + v9fs_register_transport(s, &xen_9p_transport); + fsdev = qemu_opts_create(qemu_find_opts("fsdev"), + s->fsconf.tag, + 1, NULL); + qemu_opt_set(fsdev, "fsdriver", "local", NULL); + qemu_opt_set(fsdev, "path", xen_9pdev->path, NULL); + qemu_opt_set(fsdev, "security_model", xen_9pdev->security_model, NULL); + qemu_opts_set_id(fsdev, s->fsconf.fsdev_id); + qemu_fsdev_add(fsdev); + v9fs_device_realize_common(s, NULL); + return 0; + +out: + xen_9pfs_free(xendev); + return -1; } static void xen_9pfs_alloc(struct XenDevice *xendev) { + xenstore_write_be_str(xendev, "versions", VERSIONS); + xenstore_write_be_int(xendev, "max-rings", MAX_RINGS); + xenstore_write_be_int(xendev, "max-ring-page-order", MAX_RING_ORDER); } static void xen_9pfs_disconnect(struct XenDevice *xendev) { + /* Dynamic hotplug of PV filesystems at runtime is not supported. */ } struct XenDevOps xen_9pfs_ops = {