Il 24/07/2013 15:14, Michael S. Tsirkin ha scritto: > On Wed, Jul 24, 2013 at 02:59:18PM +0200, Paolo Bonzini wrote: >> Il 24/07/2013 11:51, Michael S. Tsirkin ha scritto: >>>> Current seabios uses a slightly different approach: the 64bit hole is >>>> present only in case it is actually used to map bars there, and seabios >>>> tries to fit everything into the 32bit hole first. >>> >>> Yes. But this doesn't work with device hotplug. >> >> Are you preserving that behavior for older machine types? > > Older machine types (1.5 and back) don't report PCI hole size to guests > so there's nothing to preserve.
So pc-1.5 and older always use the SeaBIOS ACPI tables, even on new QEMU? (I guess I should review your ACPI table patches). Paolo > This means there's not much I can do for pc-1.5: as before this > patch, hotplug of devices with large BARs won't work, > and some windows guests will crash if a device with a huge > BAR is added statically. > >> (Also, what happens if you do -global i440FX-pcihost.pci_hole64_size=0? >> Does that return a _CRS with only the 32-bit hole)? >> >> Paolo > > Yes. >
