[Qemu-devel] [PATCH 1/2] vl: Round argument of -m up to multiple of 8KiB

[Markus Armbruster <armbru@redhat.com>]

Partial pages make little sense and don't work.  Ensure the RAM size
is a multiple of any possible target's page size.

Fixes

$ qemu-system-x86_64 -nodefaults -S -vnc :0 -monitor stdio -m 0.8
QEMU 1.1.50 monitor - type 'help' for more information
(qemu) qemu-system-x86_64: /work/armbru/qemu/exec.c:2255: register_subpage: Assertion `existing->mr->subpage || existing->mr == &io_mem_unassigned' failed

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
See also
http://lists.nongnu.org/archive/html/qemu-devel/2012-06/msg02813.html

 vl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/vl.c b/vl.c
index d01256a..b411d45 100644
--- a/vl.c
+++ b/vl.c
@@ -2708,11 +2708,13 @@ int main(int argc, char **argv, char **envp)
                     fprintf(stderr, "qemu: invalid ram size: %s\n", optarg);
                     exit(1);
                 }
-
                 if (value != (uint64_t)(ram_addr_t)value) {
                     fprintf(stderr, "qemu: ram size too large\n");
                     exit(1);
                 }
+                if (value & 0x1fff) {
+                    value = (value + 0x1fff) & ~0x1fff;
+                }
                 ram_size = value;
                 break;
             }
-- 
1.7.11.2