[Xen-devel] [PATCH 14/17] xenpaging: prevent page-out of first 16MB

[Olaf Hering <olaf@xxxxxxxxx>]

This is more a workaround than a bugfix:
Don't page out first 16MB of memory.
When the BIOS does its initialization process and xenpaging removes pages,
crashes will occour due to lack of support of xenpaging.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>

---
 tools/xenpaging/policy_default.c |    4 ++++
 1 file changed, 4 insertions(+)

--- xen-unstable.hg-4.1.22459.orig/tools/xenpaging/policy_default.c
+++ xen-unstable.hg-4.1.22459/tools/xenpaging/policy_default.c
@@ -60,6 +60,10 @@ int policy_init(xenpaging_t *paging)
     for ( i = 0; i < MRU_SIZE; i++ )
         mru[i] = INVALID_MFN;
 
+    /* Don't page out first 16MB */
+    for ( i = 0; i < ((16*1024*1024)/4096); i++ )
+        set_bit(i, bitmap);
+
     /* Leave a hole for pagetables */
     for ( i = 0; i < max_pages; i++ )
         set_bit(i, bitmap);


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