To lower the entry level for new developers, add a link to the 9p developer docs (i.e. qemu wiki) to MAINTAINERS and to the beginning of 9p source files, that is to: https://wiki.qemu.org/Documentation/9p Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com> Acked-by: Greg Kurz <groug@kaod.org> Message-Id: <E1leeDf-0008GZ-9q@lizzy.crudebyte.com>
291 lines
8.4 KiB
C
291 lines
8.4 KiB
C
/*
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* libqos driver framework
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*
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* Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>
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*/
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/*
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* Not so fast! You might want to read the 9p developer docs first:
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* https://wiki.qemu.org/Documentation/9p
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*/
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#include "qemu/osdep.h"
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#include "libqtest.h"
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#include "qemu/module.h"
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#include "standard-headers/linux/virtio_ids.h"
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#include "virtio-9p.h"
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#include "qgraph.h"
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static QGuestAllocator *alloc;
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static char *local_test_path;
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/* Concatenates the passed 2 pathes. Returned result must be freed. */
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static char *concat_path(const char* a, const char* b)
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{
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return g_build_filename(a, b, NULL);
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}
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static void init_local_test_path(void)
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{
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char *pwd = g_get_current_dir();
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char *template = concat_path(pwd, "qtest-9p-local-XXXXXX");
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local_test_path = mkdtemp(template);
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if (!local_test_path) {
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g_test_message("mkdtemp('%s') failed: %s", template, strerror(errno));
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}
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g_assert(local_test_path);
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g_free(pwd);
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}
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void virtio_9p_create_local_test_dir(void)
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{
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struct stat st;
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int res;
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init_local_test_path();
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g_assert(local_test_path != NULL);
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res = mkdir(local_test_path, 0777);
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if (res < 0) {
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g_test_message("mkdir('%s') failed: %s", local_test_path,
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strerror(errno));
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}
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/* ensure test directory exists now ... */
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g_assert(stat(local_test_path, &st) == 0);
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/* ... and is actually a directory */
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g_assert((st.st_mode & S_IFMT) == S_IFDIR);
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}
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void virtio_9p_remove_local_test_dir(void)
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{
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g_assert(local_test_path != NULL);
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char *cmd = g_strdup_printf("rm -fr '%s'\n", local_test_path);
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int res = system(cmd);
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if (res < 0) {
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/* ignore error, dummy check to prevent compiler error */
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}
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g_free(cmd);
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}
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char *virtio_9p_test_path(const char *path)
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{
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g_assert(local_test_path);
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return concat_path(local_test_path, path);
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}
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static void virtio_9p_cleanup(QVirtio9P *interface)
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{
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qvirtqueue_cleanup(interface->vdev->bus, interface->vq, alloc);
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}
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static void virtio_9p_setup(QVirtio9P *interface)
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{
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uint64_t features;
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features = qvirtio_get_features(interface->vdev);
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features &= ~(QVIRTIO_F_BAD_FEATURE | (1ull << VIRTIO_RING_F_EVENT_IDX));
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qvirtio_set_features(interface->vdev, features);
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interface->vq = qvirtqueue_setup(interface->vdev, alloc, 0);
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qvirtio_set_driver_ok(interface->vdev);
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}
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/* virtio-9p-device */
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static void virtio_9p_device_destructor(QOSGraphObject *obj)
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{
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QVirtio9PDevice *v_9p = (QVirtio9PDevice *) obj;
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QVirtio9P *v9p = &v_9p->v9p;
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virtio_9p_cleanup(v9p);
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}
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static void virtio_9p_device_start_hw(QOSGraphObject *obj)
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{
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QVirtio9PDevice *v_9p = (QVirtio9PDevice *) obj;
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QVirtio9P *v9p = &v_9p->v9p;
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virtio_9p_setup(v9p);
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}
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static void *virtio_9p_get_driver(QVirtio9P *v_9p,
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const char *interface)
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{
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if (!g_strcmp0(interface, "virtio-9p")) {
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return v_9p;
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}
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if (!g_strcmp0(interface, "virtio")) {
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return v_9p->vdev;
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}
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fprintf(stderr, "%s not present in virtio-9p-device\n", interface);
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g_assert_not_reached();
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}
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static void *virtio_9p_device_get_driver(void *object, const char *interface)
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{
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QVirtio9PDevice *v_9p = object;
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return virtio_9p_get_driver(&v_9p->v9p, interface);
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}
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static void *virtio_9p_device_create(void *virtio_dev,
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QGuestAllocator *t_alloc,
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void *addr)
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{
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QVirtio9PDevice *virtio_device = g_new0(QVirtio9PDevice, 1);
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QVirtio9P *interface = &virtio_device->v9p;
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interface->vdev = virtio_dev;
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alloc = t_alloc;
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virtio_device->obj.destructor = virtio_9p_device_destructor;
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virtio_device->obj.get_driver = virtio_9p_device_get_driver;
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virtio_device->obj.start_hw = virtio_9p_device_start_hw;
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return &virtio_device->obj;
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}
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/* virtio-9p-pci */
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static void virtio_9p_pci_destructor(QOSGraphObject *obj)
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{
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QVirtio9PPCI *v9_pci = (QVirtio9PPCI *) obj;
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QVirtio9P *interface = &v9_pci->v9p;
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QOSGraphObject *pci_vobj = &v9_pci->pci_vdev.obj;
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virtio_9p_cleanup(interface);
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qvirtio_pci_destructor(pci_vobj);
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}
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static void virtio_9p_pci_start_hw(QOSGraphObject *obj)
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{
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QVirtio9PPCI *v9_pci = (QVirtio9PPCI *) obj;
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QVirtio9P *interface = &v9_pci->v9p;
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QOSGraphObject *pci_vobj = &v9_pci->pci_vdev.obj;
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qvirtio_pci_start_hw(pci_vobj);
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virtio_9p_setup(interface);
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}
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static void *virtio_9p_pci_get_driver(void *object, const char *interface)
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{
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QVirtio9PPCI *v_9p = object;
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if (!g_strcmp0(interface, "pci-device")) {
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return v_9p->pci_vdev.pdev;
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}
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return virtio_9p_get_driver(&v_9p->v9p, interface);
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}
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static void *virtio_9p_pci_create(void *pci_bus, QGuestAllocator *t_alloc,
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void *addr)
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{
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QVirtio9PPCI *v9_pci = g_new0(QVirtio9PPCI, 1);
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QVirtio9P *interface = &v9_pci->v9p;
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QOSGraphObject *obj = &v9_pci->pci_vdev.obj;
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virtio_pci_init(&v9_pci->pci_vdev, pci_bus, addr);
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interface->vdev = &v9_pci->pci_vdev.vdev;
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alloc = t_alloc;
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g_assert_cmphex(interface->vdev->device_type, ==, VIRTIO_ID_9P);
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obj->destructor = virtio_9p_pci_destructor;
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obj->start_hw = virtio_9p_pci_start_hw;
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obj->get_driver = virtio_9p_pci_get_driver;
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return obj;
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}
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/**
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* Performs regular expression based search and replace on @a haystack.
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*
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* @param haystack - input string to be parsed, result of replacement is
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* stored back to @a haystack
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* @param pattern - the regular expression pattern for scanning @a haystack
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* @param replace_fmt - matches of supplied @a pattern are replaced by this,
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* if necessary glib printf format can be used to add
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* variable arguments of this function to this
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* replacement string
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*/
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static void regex_replace(GString *haystack, const char *pattern,
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const char *replace_fmt, ...)
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{
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GRegex *regex;
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char *replace, *s;
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va_list argp;
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va_start(argp, replace_fmt);
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replace = g_strdup_vprintf(replace_fmt, argp);
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va_end(argp);
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regex = g_regex_new(pattern, 0, 0, NULL);
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s = g_regex_replace(regex, haystack->str, -1, 0, replace, 0, NULL);
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g_string_assign(haystack, s);
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g_free(s);
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g_regex_unref(regex);
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g_free(replace);
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}
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void virtio_9p_assign_local_driver(GString *cmd_line, const char *args)
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{
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g_assert_nonnull(local_test_path);
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/* replace 'synth' driver by 'local' driver */
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regex_replace(cmd_line, "-fsdev synth,", "-fsdev local,");
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/* append 'path=...' to '-fsdev ...' group */
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regex_replace(cmd_line, "(-fsdev \\w[^ ]*)", "\\1,path='%s'",
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local_test_path);
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if (!args) {
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return;
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}
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/* append passed args to '-fsdev ...' group */
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regex_replace(cmd_line, "(-fsdev \\w[^ ]*)", "\\1,%s", args);
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}
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static void virtio_9p_register_nodes(void)
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{
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const char *str_simple = "fsdev=fsdev0,mount_tag=" MOUNT_TAG;
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const char *str_addr = "fsdev=fsdev0,addr=04.0,mount_tag=" MOUNT_TAG;
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QPCIAddress addr = {
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.devfn = QPCI_DEVFN(4, 0),
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};
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QOSGraphEdgeOptions opts = {
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.before_cmd_line = "-fsdev synth,id=fsdev0",
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};
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/* virtio-9p-device */
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opts.extra_device_opts = str_simple,
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qos_node_create_driver("virtio-9p-device", virtio_9p_device_create);
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qos_node_consumes("virtio-9p-device", "virtio-bus", &opts);
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qos_node_produces("virtio-9p-device", "virtio");
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qos_node_produces("virtio-9p-device", "virtio-9p");
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/* virtio-9p-pci */
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opts.extra_device_opts = str_addr;
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add_qpci_address(&opts, &addr);
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qos_node_create_driver("virtio-9p-pci", virtio_9p_pci_create);
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qos_node_consumes("virtio-9p-pci", "pci-bus", &opts);
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qos_node_produces("virtio-9p-pci", "pci-device");
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qos_node_produces("virtio-9p-pci", "virtio");
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qos_node_produces("virtio-9p-pci", "virtio-9p");
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}
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libqos_init(virtio_9p_register_nodes);
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