minios: Disable the mfn_is_ram() check, it doesn't work correctly on all systems

This patch disables the mfn_is_ram check in mini-os. The current check
is insufficient and fails on some systems with larger than 4gb memory.

Signed-off-by: Matthew Fioravante <matthew.fioravante@jhuapl.edu>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyons.org>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

1 files changed, 0 insertions, 16 deletions

diff --git a/extras/mini-os/arch/x86/mm.c b/extras/mini-os/arch/x86/mm.c
index 80aceacd2a..35df15bd1e 100644
--- a/extras/mini-os/arch/x86/mm.c
+++ b/extras/mini-os/arch/x86/mm.c
@@ -845,18 +845,6 @@ unsigned long alloc_contig_pages(int order, unsigned int addr_bits)
 }
 
 /*
- * Check if a given MFN refers to real memory
- */
-static long system_ram_end_mfn;
-int mfn_is_ram(unsigned long mfn)
-{
-    /* very crude check if a given MFN is memory or not. Probably should
-     * make this a little more sophisticated ;) */
-    return (mfn <= system_ram_end_mfn) ? 1 : 0;
-}
-
-
-/*
  * Clear some of the bootstrap memory
  */
 static void clear_bootstrap(void)
@@ -951,10 +939,6 @@ void arch_init_mm(unsigned long* start_pfn_p, unsigned long* max_pfn_p)
     clear_bootstrap();
     set_readonly(&_text, &_erodata);
 
-    /* get the number of physical pages the system has. Used to check for
-     * system memory. */
-    system_ram_end_mfn = HYPERVISOR_memory_op(XENMEM_maximum_ram_page, NULL);
-
     *start_pfn_p = start_pfn;
     *max_pfn_p = max_pfn;
 }