xen: Introduce the Xen mapcache

On IA32 host or IA32 PAE host, at present, generally, we can't create
an HVM guest with more than 2G memory, because generally it's almost
impossible for Qemu to find a large enough and consecutive virtual
address space to map an HVM guest's whole physical address space.
The attached patch fixes this issue using dynamic mapping based on
little blocks of memory.

Each call to qemu_get_ram_ptr makes a call to qemu_map_cache with the
lock option, so mapcache will not unmap these ram_ptr.

Blocks that do not belong to the RAM, but usually to a device ROM or to
a framebuffer, are handled in a separate function. So the whole RAMBlock
can be map.

Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 37 insertions, 0 deletions

diff --git a/xen-mapcache.h b/xen-mapcache.h
new file mode 100644
index 0000000..339444c
--- /dev/null
+++ b/xen-mapcache.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2011       Citrix Ltd.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef XEN_MAPCACHE_H
+#define XEN_MAPCACHE_H
+
+#include <sys/mman.h>
+#include "trace.h"
+
+void     qemu_map_cache_init(void);
+uint8_t  *qemu_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size, uint8_t lock);
+void     qemu_map_cache_unlock(void *phys_addr);
+ram_addr_t qemu_ram_addr_from_mapcache(void *ptr);
+void     qemu_invalidate_entry(uint8_t *buffer);
+void     qemu_invalidate_map_cache(void);
+
+uint8_t *xen_map_block(target_phys_addr_t phys_addr, target_phys_addr_t size);
+
+static inline void xen_unmap_block(void *addr, ram_addr_t size)
+{
+    trace_xen_unmap_block(addr, size);
+
+    if (munmap(addr, size) != 0) {
+        hw_error("xen_unmap_block: %s", strerror(errno));
+    }
+}
+
+
+#define mapcache_lock()   ((void)0)
+#define mapcache_unlock() ((void)0)
+
+#endif /* !XEN_MAPCACHE_H */