When Linux refuses to overcommit a seriously wild allocation we get:
$ qemu-system-i386 -m 40000000
qemu-system-i386: cannot set up guest memory 'pc.ram': Cannot
allocate memory
Slighly improve the error message, displaying the memory size
requested (in case the user didn't expect unspecified memory size
unit is in MiB):
$ qemu-system-i386 -m 40000000
qemu-system-i386: Cannot set up 38.1 TiB of guest memory 'pc.ram':
Cannot allocate memory
Reported-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
softmmu/physmem.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index 2e18947598e..2f300a9e79b 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -1982,8 +1982,10 @@ static void ram_block_add(RAMBlock *new_block,
Error **errp)
&new_block->mr->align,
shared, noreserve);
if (!new_block->host) {
+ g_autofree char *size_s =
size_to_str(new_block->max_length);
error_setg_errno(errp, errno,
- "cannot set up guest memory '%s'",
+ "Cannot set up %s of guest memory
'%s'",
+ size_s,
memory_region_name(new_block->mr));
qemu_mutex_unlock_ramlist();
return;