mirror of
https://github.com/xen-project/xen.git
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Viresh Kumar
5e3463af07
Only the VirtIO backend will watch xenstore to find out when a new instance needs to be created for a guest, and read the parameters from there. VirtIO frontend are only virtio, so they will not do anything with the xenstore nodes. They can be removed. While at it, also add a comment to the libxl_virtio.c file. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
/*
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* Setup VirtIO backend. This is intended to interact with a VirtIO
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* backend that is watching xenstore, and create new VirtIO devices
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* with the parameter found in xenstore (VirtIO frontend don't
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* interact with xenstore.)
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*
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* Copyright (C) 2022 Linaro Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; version 2.1 only. with the special
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* exception on linking described in file LICENSE.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*/
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#include "libxl_internal.h"
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static int libxl__device_virtio_setdefault(libxl__gc *gc, uint32_t domid,
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libxl_device_virtio *virtio,
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bool hotplug)
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{
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return libxl__resolve_domid(gc, virtio->backend_domname,
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&virtio->backend_domid);
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}
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static int libxl__device_from_virtio(libxl__gc *gc, uint32_t domid,
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libxl_device_virtio *virtio,
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libxl__device *device)
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{
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device->backend_devid = virtio->devid;
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device->backend_domid = virtio->backend_domid;
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device->devid = virtio->devid;
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device->domid = domid;
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device->backend_kind = LIBXL__DEVICE_KIND_VIRTIO;
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device->kind = LIBXL__DEVICE_KIND_VIRTIO;
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return 0;
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}
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static int libxl__set_xenstore_virtio(libxl__gc *gc, uint32_t domid,
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libxl_device_virtio *virtio,
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flexarray_t *back, flexarray_t *front,
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flexarray_t *ro_front)
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{
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const char *transport = libxl_virtio_transport_to_string(virtio->transport);
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flexarray_append_pair(back, "irq", GCSPRINTF("%u", virtio->irq));
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flexarray_append_pair(back, "base", GCSPRINTF("%#"PRIx64, virtio->base));
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flexarray_append_pair(back, "type", GCSPRINTF("%s", virtio->type));
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flexarray_append_pair(back, "transport", GCSPRINTF("%s", transport));
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return 0;
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}
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static int libxl__virtio_from_xenstore(libxl__gc *gc, const char *libxl_path,
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libxl_devid devid,
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libxl_device_virtio *virtio)
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{
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const char *be_path, *tmp = NULL;
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int rc;
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virtio->devid = devid;
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rc = libxl__xs_read_mandatory(gc, XBT_NULL,
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GCSPRINTF("%s/backend", libxl_path),
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&be_path);
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if (rc) goto out;
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rc = libxl__backendpath_parse_domid(gc, be_path, &virtio->backend_domid);
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if (rc) goto out;
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rc = libxl__xs_read_checked(gc, XBT_NULL,
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GCSPRINTF("%s/irq", be_path), &tmp);
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if (rc) goto out;
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if (tmp) {
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virtio->irq = strtoul(tmp, NULL, 0);
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}
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tmp = NULL;
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rc = libxl__xs_read_checked(gc, XBT_NULL,
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GCSPRINTF("%s/base", be_path), &tmp);
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if (rc) goto out;
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if (tmp) {
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virtio->base = strtoul(tmp, NULL, 0);
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}
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tmp = NULL;
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rc = libxl__xs_read_checked(gc, XBT_NULL,
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GCSPRINTF("%s/transport", be_path), &tmp);
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if (rc) goto out;
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if (tmp) {
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if (!strcmp(tmp, "mmio")) {
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virtio->transport = LIBXL_VIRTIO_TRANSPORT_MMIO;
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} else {
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return ERROR_INVAL;
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}
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}
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tmp = NULL;
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rc = libxl__xs_read_checked(gc, XBT_NULL,
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GCSPRINTF("%s/type", be_path), &tmp);
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if (rc) goto out;
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if (tmp) {
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int len = sizeof(VIRTIO_DEVICE_TYPE_GENERIC) - 1;
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if (!strncmp(tmp, VIRTIO_DEVICE_TYPE_GENERIC, len)) {
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virtio->type = libxl__strdup(NOGC, tmp);
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} else {
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return ERROR_INVAL;
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}
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}
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out:
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return rc;
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}
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static LIBXL_DEFINE_UPDATE_DEVID(virtio)
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#define libxl__add_virtios NULL
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#define libxl_device_virtio_compare NULL
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DEFINE_DEVICE_TYPE_STRUCT(virtio, VIRTIO, virtios,
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.set_xenstore_config = (device_set_xenstore_config_fn_t)
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libxl__set_xenstore_virtio,
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.from_xenstore = (device_from_xenstore_fn_t)libxl__virtio_from_xenstore,
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.skip_attach = 1
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);
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/*
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* Local variables:
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* mode: C
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* c-basic-offset: 4
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* indent-tabs-mode: nil
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* End:
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*/
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