commit 3984890181
pc: limit 64 bit hole to 2G by default
introduced a way for management to control
the window allocated to the 64 bit PCI hole.
This is useful, but existing management tools do not know how to set
this property. As a result, e.g. specifying a large ivshmem device with
size > 4G is broken by default. For example this configuration no
longer works:
-device ivshmem,size=4294967296,chardev=cfoo
-chardev socket,path=/tmp/sock,id=cfoo,server,nowait
Fix this by detecting that hole size was not specified
and defaulting to the backwards-compatible value of 1 << 62.
Cc: qemu-stable@nongnu.org
Cc: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
1466cef32d