From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34327) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cl4cc-00087g-2f for qemu-devel@nongnu.org; Mon, 06 Mar 2017 21:13:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cl4ca-0002bV-Pv for qemu-devel@nongnu.org; Mon, 06 Mar 2017 21:13:06 -0500 Received: from mail.kernel.org ([198.145.29.136]:59570) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cl4ca-0002b7-F2 for qemu-devel@nongnu.org; Mon, 06 Mar 2017 21:13:04 -0500 From: Stefano Stabellini Date: Mon, 6 Mar 2017 18:12:44 -0800 Message-Id: <1488852768-8935-4-git-send-email-sstabellini@kernel.org> In-Reply-To: <1488852768-8935-1-git-send-email-sstabellini@kernel.org> References: <1488852768-8935-1-git-send-email-sstabellini@kernel.org> Subject: [Qemu-devel] [PATCH 4/8] xen/9pfs: connect to the frontend List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: xen-devel@lists.xenproject.org, sstabellini@kernel.org, Stefano Stabellini , anthony.perard@citrix.com, jgross@suse.com, "Aneesh Kumar K.V" , Greg Kurz 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 | 159 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 158 insertions(+), 1 deletion(-) diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c index 924fb64..59e89fd 100644 --- a/hw/9pfs/xen-9p-backend.c +++ b/hw/9pfs/xen-9p-backend.c @@ -17,8 +17,35 @@ #include "qemu/config-file.h" #include "fsdev/qemu-fsdev.h" +#define VERSIONS "1" +#define MAX_RINGS 8 +#define MAX_RING_ORDER 8 + +struct Xen9pfsRing { + struct Xen9pfsDev *priv; + + int ref; + xenevtchn_handle *evtchndev; + int evtchn; + int local_port; + struct xen_9pfs_data_intf *intf; + unsigned char *data; + struct xen_9pfs_data ring; + + 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; +}; + struct Xen9pfsDev { struct XenDevice xendev; /* must be first */ + V9fsState state; + + int num_rings; + struct Xen9pfsRing *rings; }; static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu, @@ -67,22 +94,152 @@ 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; + struct Xen9pfsDev *xen_9pdev = container_of(xendev, struct Xen9pfsDev, xendev); + + 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_9PFS_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; + struct Xen9pfsDev *xen_9pdev = container_of(xendev, struct Xen9pfsDev, xendev); + V9fsState *s = &xen_9pdev->state; + QemuOpts *fsdev; + char *security_model, *path; + + if (xenstore_read_fe_int(&xen_9pdev->xendev, "num-rings", + &xen_9pdev->num_rings) == -1 || + xen_9pdev->num_rings > MAX_RINGS) { + return -1; + } + + xen_9pdev->rings = g_malloc0(xen_9pdev->num_rings * sizeof(struct Xen9pfsRing)); + for (i = 0; i < xen_9pdev->num_rings; i++) { + char str[16]; + + xen_9pdev->rings[i].priv = xen_9pdev; + xen_9pdev->rings[i].evtchn = -1; + xen_9pdev->rings[i].local_port = -1; + + sprintf(str, "ring-ref%u", i); + if (xenstore_read_fe_int(&xen_9pdev->xendev, str, + &xen_9pdev->rings[i].ref) == -1) { + goto out; + } + sprintf(str, "event-channel-%u", i); + if (xenstore_read_fe_int(&xen_9pdev->xendev, str, + &xen_9pdev->rings[i].evtchn) == -1) { + goto out; + } + + 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; + } + xen_9pdev->rings[i].data = xengnttab_map_domain_grant_refs( + xen_9pdev->xendev.gnttabdev, + (1 << XEN_9PFS_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_9PFS_RING_SIZE; + + 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]); + } + + security_model = xenstore_read_be_str(xendev, "security_model"); + path = xenstore_read_be_str(xendev, "path"); + s->fsconf.fsdev_id = g_malloc(strlen("xen9p") + 6); + sprintf(s->fsconf.fsdev_id, "xen9p%d", xendev->dev); + 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", path, NULL); + qemu_opt_set(fsdev, "security_model", 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 = { -- 1.9.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Stabellini Subject: [PATCH 4/8] xen/9pfs: connect to the frontend Date: Mon, 6 Mar 2017 18:12:44 -0800 Message-ID: <1488852768-8935-4-git-send-email-sstabellini@kernel.org> References: <1488852768-8935-1-git-send-email-sstabellini@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail6.bemta6.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cl4cd-00021k-4L for xen-devel@lists.xenproject.org; Tue, 07 Mar 2017 02:13:07 +0000 In-Reply-To: <1488852768-8935-1-git-send-email-sstabellini@kernel.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: qemu-devel@nongnu.org Cc: jgross@suse.com, sstabellini@kernel.org, Greg Kurz , Stefano Stabellini , "Aneesh Kumar K.V" , anthony.perard@citrix.com, xen-devel@lists.xenproject.org List-Id: xen-devel@lists.xenproject.org V3JpdGUgdGhlIGxpbWl0cyBvZiB0aGUgYmFja2VuZCB0byB4ZW5zdG9yZS4gQ29ubmVjdCB0byB0 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