[Qemu-devel] [PATCH] Allocate translation buffer before guest RAM, in case guest RAM is too large on 64 bit hosts

[Juergen Lock]

Hi!

 The following patch appears to fix -m >= 1024 on recent FreeBSD/amd64 hosts
(RELENG_7/HEAD) that no longer return high addresses for allocations by
default (which was the original reason for r5331.)  As this makes sense
in any case when you pass something like -m 4096 on hosts that allocate
from low addresses by default (there would be no room left for the
translation buffer in the low vm where it needs to be), I patched it like
this instead of conditionalizing the mmap hack from r5331 on the FreeBSD
version.

Index: qemu/vl.c
@@ -9850,15 +9850,15 @@
         phys_ram_size += ram_size;
     }
 
+    /* init the dynamic translator */
+    cpu_exec_init_all(tb_size * 1024 * 1024);
+
     phys_ram_base = qemu_vmalloc(phys_ram_size);
     if (!phys_ram_base) {
         fprintf(stderr, "Could not allocate physical memory\n");
         exit(1);
     }
 
-    /* init the dynamic translator */
-    cpu_exec_init_all(tb_size * 1024 * 1024);
-
     bdrv_init(emulate_aio);
 
     /* we always create the cdrom drive, even if no disk is there */

Signed-off-by: Juergen Lock <address@hidden>