[PATCH v4 01/11] Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>

[Karim Taha <kariem.taha2.7@gmail.com>]

From: Warner Losh <imp@bsdimp.com>

Intialize guest_base in bsd-user/main.c.

Allow guest_base to be initialized on 64-bit hosts, the initial value is used by g2h_untagged function defined in include/exec/cpu_ldst.h

Signed-off-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>
---
 bsd-user/main.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/bsd-user/main.c b/bsd-user/main.c
index babc3b009b..afdc1b5f3c 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -50,8 +50,22 @@
 #include "target_arch_cpu.h"
 
 int singlestep;
-uintptr_t guest_base;
+
+/*
+ * Going hand in hand with the va space needed (see below), we need
+ * to find a host address to map the guest to. Assume that qemu
+ * itself doesn't need memory above 32GB (or that we don't collide
+ * with anything interesting). This is selected rather arbitrarily,
+ * but seems to produce good results in tests to date.
+ */
+# if HOST_LONG_BITS >= 64
+uintptr_t guest_base = 0x800000000ul;    /* at 32GB */
+bool have_guest_base = true;
+#else
+uintptr_t guest_base;    /* TODO: use sysctl to find big enough hole */
 bool have_guest_base;
+#endif
+
 /*
  * When running 32-on-64 we should make sure we can fit all of the possible
  * guest address space into a contiguous chunk of virtual host memory.
-- 
2.40.0