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[Qemu-devel] [PATCH 30/40] xenner: libxc emu: memory mapping
From: |
Alexander Graf |
Subject: |
[Qemu-devel] [PATCH 30/40] xenner: libxc emu: memory mapping |
Date: |
Mon, 1 Nov 2010 16:01:43 +0100 |
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 <address@hidden>
---
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 <address@hidden>
+ * Alexander Graf <address@hidden>
+ *
+ * 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
- Re: [Qemu-devel] [PATCH 33/40] xenner: core, (continued)
[Qemu-devel] [PATCH 19/40] xenner: kernel: Makefile, Alexander Graf, 2010/11/01
[Qemu-devel] [PATCH 14/40] xenner: kernel: Instruction emulator, Alexander Graf, 2010/11/01
[Qemu-devel] [PATCH 30/40] xenner: libxc emu: memory mapping,
Alexander Graf <=
[Qemu-devel] [PATCH 06/40] qdev-ify: xen backends, Alexander Graf, 2010/11/01
[Qemu-devel] [PATCH 24/40] xenner: kernel: printk, Alexander Graf, 2010/11/01
[Qemu-devel] [PATCH 25/40] xenner: kernel: KVM PV code, Alexander Graf, 2010/11/01
[Qemu-devel] [PATCH 02/40] elf: Add notes implementation, Alexander Graf, 2010/11/01