On 04/08/2010 01:51 AM, Cam Macdonell wrote:
This avoids the need of using qemu_ram_alloc and mmap with MAP_FIXED to map a
host file into guest RAM. This function mmaps the opened file anywhere and adds
the memory to the ram blocks.
Usage is
qemu_ram_mmap(fd, size, MAP_SHARED, offset);
---
cpu-common.h | 1 +
exec.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/cpu-common.h b/cpu-common.h
index 49c7fb3..87c82fc 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -32,6 +32,7 @@ static inline void cpu_register_physical_memory(target_phys_addr_t start_addr,
}
ram_addr_t cpu_get_physical_page_desc(target_phys_addr_t addr);
+ram_addr_t qemu_ram_mmap(int, ram_addr_t, int, int);
Use prototypes with argument names please. That's not the style around
it, but that's bad style.
+ram_addr_t qemu_ram_mmap(int fd, ram_addr_t size, int flags, int offset)
off_t offset
+{
+ RAMBlock *new_block;
+
+ size = TARGET_PAGE_ALIGN(size);
+ new_block = qemu_malloc(sizeof(*new_block));
+
+ // map the file passed as a parameter to be this part of memory
/* comments */
+ new_block->host = mmap(0, size, PROT_READ|PROT_WRITE, flags, fd, offset);
Error checking.
+
+#ifdef MADV_MERGEABLE
+ madvise(new_block->host, size, MADV_MERGEABLE);
+#endif
Won't work (ksm only merges anonymous pages), but keep it there in case
it learns about pagecache.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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