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 guest memory mapping. Signed-off-by: Alexander Graf <ag...@suse.de> --- hw/xenner_libxc_if.c | 124 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 124 insertions(+), 0 deletions(-) create mode 100644 hw/xenner_libxc_if.c diff --git a/hw/xenner_libxc_if.c b/hw/xenner_libxc_if.c new file mode 100644 index 0000000..7ccd3c0 --- /dev/null +++ b/hw/xenner_libxc_if.c @@ -0,0 +1,124 @@ +/* + * Copyright (C) Red Hat 2007 + * Copyright (C) Novell Inc. 2010 + * + * Author(s): Gerd Hoffmann <kra...@redhat.com> + * Alexander Graf <ag...@suse.de> + * + * Xenner Emulation -- memory management + * + * 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 <sys/mman.h> +#include <xenctrl.h> + +#include "hw.h" +#include "xen_interfaces.h" +#include "xenner.h" + +/* ------------------------------------------------------------- */ + +static int _qemu_open(void) +{ + return 42; +} + +static int qemu_close(int xc_handle) +{ + return 0; +} + +static void *qemu_map_foreign_range(int xc_handle, uint32_t dom, + int size, int prot, unsigned long mfn) +{ + target_phys_addr_t addr, len; + void *ptr; + + addr = (target_phys_addr_t)mfn << PAGE_SHIFT; + len = size; + ptr = cpu_physical_memory_map(addr, &len, 1); + + if (len != size) { + fprintf(stderr, "%s: couldn't allocate %d bytes\n", __FUNCTION__, size); + return NULL; + } + + return ptr; +} + +static void *qemu_map_foreign_batch(int xc_handle, uint32_t dom, int prot, + xen_pfn_t *arr, int num) +{ + ram_addr_t offset; + void *ptr; + int i; + target_phys_addr_t len = num * TARGET_PAGE_SIZE; + + char filename[] = "/dev/shm/qemu-vmcore.XXXXXX"; + int rc, fd; + + fd = mkstemp(filename); + if (fd == -1) { + fprintf(stderr, "mkstemp(%s): %s\n", filename, strerror(errno)); + return NULL; + }; + unlink(filename); + + rc = ftruncate(fd, len); + if (rc != 0) { + fprintf(stderr, "ftruncate(0x%" PRIx64 "): %s\n", + (uint64_t)len, strerror(errno)); + return NULL; + } + + ptr = mmap(NULL, len, PROT_WRITE | PROT_READ, MAP_SHARED | MAP_POPULATE, + fd, 0); + + for (i = 0; i < num; i++) { + void *map; + target_phys_addr_t pagelen = TARGET_PAGE_SIZE; + + printf("arr[%d] = %#lx\n", i, cpu_get_physical_page_desc(arr[i] << PAGE_SHIFT)); + + /* fetch the pointer in qemu's own virtual memory */ + offset = cpu_get_physical_page_desc(arr[i] << PAGE_SHIFT); + map = cpu_physical_memory_map(offset, &pagelen, 1); + + /* copy current mem to new map */ + memcpy(ptr + (i * TARGET_PAGE_SIZE), map, TARGET_PAGE_SIZE); + + if (mmap(map, TARGET_PAGE_SIZE, prot, MAP_SHARED | MAP_FIXED, + fd, i * TARGET_PAGE_SIZE) == (void*)-1) { + fprintf(stderr, "%s: mmap(#%d, mfn 0x%lx): %s\n", + __FUNCTION__, i, arr[i], strerror(errno)); + return NULL; + } + } + + return ptr; +} + +static void *qemu_map_foreign_pages(int xc_handle, uint32_t dom, int prot, + const xen_pfn_t *arr, int num) +{ + return qemu_map_foreign_batch(xc_handle, dom, prot, (void*)arr, num); +} + +struct XenIfOps xc_xenner = { + .interface_open = _qemu_open, + .interface_close = qemu_close, + .map_foreign_range = qemu_map_foreign_range, + .map_foreign_batch = qemu_map_foreign_batch, + .map_foreign_pages = qemu_map_foreign_pages, +}; -- 1.6.0.2
