Xenner emulates parts of libxc, so we can not use the real xen infrastructure when running xen pv guests without xen.
This patch adds support for grant tables. Signed-off-by: Alexander Graf <ag...@suse.de> --- hw/xenner_libxc_gnttab.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 91 insertions(+), 0 deletions(-) create mode 100644 hw/xenner_libxc_gnttab.c diff --git a/hw/xenner_libxc_gnttab.c b/hw/xenner_libxc_gnttab.c new file mode 100644 index 0000000..c9f4ce2 --- /dev/null +++ b/hw/xenner_libxc_gnttab.c @@ -0,0 +1,91 @@ +/* + * Copyright (C) Red Hat 2007 + * Copyright (C) Novell Inc. 2010 + * + * Author(s): Gerd Hoffmann <kra...@redhat.com> + * Alexander Graf <ag...@suse.de> + * + * Xenner Emulation -- grant tables + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; under version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <xenctrl.h> +#include <xen/grant_table.h> + +#include "hw.h" +#include "xen_interfaces.h" +#include "xenner.h" + +/* ------------------------------------------------------------- */ + +static grant_entry_v1_t *get_grant(uint32_t ref) +{ + grant_entry_v1_t *e; + int page, index; + + page = ref / (PAGE_SIZE / sizeof(grant_entry_v1_t)); + index = ref % (PAGE_SIZE / sizeof(grant_entry_v1_t)); + + e = xenner_get_grant_table(page); + if (!e) { + return NULL; + } + return e + index; +} + +/* ------------------------------------------------------------- */ + +static int _qemu_open(void) +{ + return 42; +} + +static int qemu_close(int xcg_handle) +{ + return 0; +} + +static void *qemu_map_grant_ref(int xcg_handle, uint32_t domid, + uint32_t ref, int prot) +{ + grant_entry_v1_t *e; + + e = get_grant(ref); + if (!e) { + return NULL; + } + + return xenner_mfn_to_ptr(e->frame); +} + +static void *qemu_map_grant_refs(int xcg_handle, uint32_t count, + uint32_t *domids, uint32_t *refs, int prot) +{ + /* Hmm, not so easy ... */ + return NULL; +} + +static int qemu_munmap(int xcg_handle, void *start_address, uint32_t count) +{ + /* nothing as we didn't actually map anything ... */ + return 0; +} + +struct XenGnttabOps xc_gnttab_xenner = { + .open = _qemu_open, + .close = qemu_close, + .map_grant_ref = qemu_map_grant_ref, + .map_grant_refs = qemu_map_grant_refs, + .munmap = qemu_munmap, +}; -- 1.6.0.2
