linux-user: Clarify "Unable to reserve guest address space" error

Now that we default to reserving nearly 4GB of RAM for the guest
address space when running a 32 bit linux-user guest on 64 bit
hosts, users are much more likely to run into it. Reword the
message to be more informative about what failed and provide
suggestions for how to fix things.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>

diff --git a/linux-user/main.c b/linux-user/main.c
index b1c228a249a29e6d42f838bbc9a98b5830112a91..1a1c661ee4fb7294e026b415c0f23ff159c79806 100644 (file)
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3519,7 +3519,10 @@ int main(int argc, char **argv, char **envp)
         guest_base = init_guest_space(guest_base, reserved_va, 0,
                                       have_guest_base);
         if (guest_base == (unsigned long)-1) {
-            fprintf(stderr, "Unable to reserve guest address space\n");
+            fprintf(stderr, "Unable to reserve 0x%lx bytes of virtual address "
+                    "space for use as guest address space (check your virtual "
+                    "memory ulimit setting or reserve less using -R option)\n",
+                    reserved_va);
             exit(1);
         }