diff options
| -rw-r--r-- | hw/9pfs/xen-9p-backend.c | 182 |
1 files changed, 181 insertions, 1 deletions
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c index da8ae185d7..03dd88126d 100644 --- a/hw/9pfs/xen-9p-backend.c +++ b/hw/9pfs/xen-9p-backend.c @@ -17,8 +17,41 @@ #include "qemu/config-file.h" #include "fsdev/qemu-fsdev.h" +#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, @@ -67,22 +100,169 @@ 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 = { |