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: Karim Taha <kariem.taha2.7@gmail.com>
This is missing the 'Signed-off-by' line of the author (me in this case). All the others suffer from this as well.
I'll see about downloading these patches and testing them locally. The changes themselves look good
to me as far as breaking them up, at least initially. I'll take a closer look when I queue them for upstreaming
to see what else I can recommend.
Warner
---
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