[PATCH][TOOLS] libxc: mmap fixes for BSD

[Christoph Egger <Christoph.Egger@amd.com>]

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Hi!

On BSD, mmap()ing files works on on-disk files but not on
pseudo filesystems like kernfs or procfs.
Therefore, attached patch mmap()s anonymous memory.

Linux equivalents are sysfs and procfs to above BSD's pseudo-filesystems.
On Linux, mmap is implemented for sysfs but it is questionable to me
how write operations work since (most) files in sysfs have
static content. So this patch may fix some problems
with a Linux Dom0, too.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>


-- 
AMD Saxony, Dresden, Germany
Operating System Research Center

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   Dr. Hans-R. Deppe, Thomas McCoy

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diff -r 57b8c74c35ef tools/libxc/xc_dom_boot.c
--- a/tools/libxc/xc_dom_boot.c	Tue Jun 10 14:17:20 2008 +0100
+++ b/tools/libxc/xc_dom_boot.c	Tue Jun 10 15:47:37 2008 +0200
@@ -166,7 +166,7 @@ void *xc_dom_boot_domU_map(struct xc_dom
     }
 
     ptr = mmap(NULL, count << page_shift, PROT_READ | PROT_WRITE,
-               MAP_SHARED, dom->guest_xc, 0);
+               MAP_ANON | MAP_SHARED, -1, 0);
     if ( ptr == MAP_FAILED )
     {
         err = errno;
diff -r 57b8c74c35ef tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c	Tue Jun 10 14:17:20 2008 +0100
+++ b/tools/libxc/xc_domain_save.c	Tue Jun 10 15:47:37 2008 +0200
@@ -589,7 +589,7 @@ static xen_pfn_t *xc_map_m2p(int xc_hand
     }
 
     if ( (m2p = mmap(NULL, m2p_size, prot,
-                     MAP_SHARED, xc_handle, 0)) == MAP_FAILED )
+                     MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED )
     {
         ERROR("failed to mmap m2p");
         return NULL;
diff -r 57b8c74c35ef tools/libxc/xc_hvm_build.c
--- a/tools/libxc/xc_hvm_build.c	Tue Jun 10 14:17:20 2008 +0100
+++ b/tools/libxc/xc_hvm_build.c	Tue Jun 10 15:47:37 2008 +0200
@@ -123,7 +123,7 @@ static int loadelfimage(
     if ( entries == NULL )
         goto err;
     elf->dest = mmap(NULL, pages << PAGE_SHIFT, PROT_READ | PROT_WRITE,
-                     MAP_SHARED, xch, 0);
+                     MAP_ANON | MAP_SHARED, -1, 0);
     if ( elf->dest == MAP_FAILED )
         goto err;
 

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