Report an error when ramblock's sizes mismatch with a suggestion to the user as to what went wrong. If a user has a managedsave state by libvirt, which is the default now, and upgrades their distro, which in turn upgrades QEMU, they will be surprised by the fact that their VMs fail to start. The reason for this is that the default ROM sizes changed recently which makes it not possible to migrate from that saved state. However the error message really does not provide details as to what went wrong. This patch attempts to provide more details
see: http://lists.nongnu.org/archive/html/qemu-devel/2012-10/msg03746.html http://lists.nongnu.org/archive/html/qemu-devel/2012-10/msg04108.html --- arch_init.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch_init.c b/arch_init.c index 8c3bb0d..33f783b 100644 --- a/arch_init.c +++ b/arch_init.c @@ -810,6 +810,11 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) QLIST_FOREACH(block, &ram_list.blocks, next) { if (!strncmp(id, block->idstr, sizeof(id))) { if (block->length != length) { + fprintf(stderr, "qemu: warning: error ramblock " + "'%s' length %ld != %ld. Did you " + "change the ROM/BIOS or RAM size " + "between restarts?\n", id, + block->length, length); ret = -EINVAL; goto done; } -- 1.7.8.6
