On 2014/5/19 19:22, Gerd Hoffmann wrote:
Hi,
I think '-vga none' just guarantees the qemu vga cards doesn't occupy
00:02.0, but this doesn't mean others use this specific slot since in
qemu internal, we always pass -1 to assign a slot automatically to
register a PCI device. So in some cases, we can't get this slot as we
expect since that is already assigned previously before we need this.
Yes, -vga, -net nic, -drive if=scsi (maybe more) can internally create
pci devices with auto slot assignment, which will occupy slot 2 indeed.
Use -device instead to create the devices.
PCI: slot 2 function 0 not available for xen-pci-passthrough, in use
by xen-platform
Ah, the xen platform device. /me looks. Ah, pc_xen_hvm_init creates
this automatically. Two options here IMHO:
(1) Just move it somewhere else explicitly. For example slot 3, or
make it a southbridge function (say 00:01.7).
(2) Don't create it automatically, instead expect management add it
if needed, using -device xen-plaform,addr=...
Gerd,
Sorry I return this discussion again.
As we discussed here, we should never use -vga xxx to avoid occupying
slot 2. Instead, we will just use -device to create that emulated vga
device as you said like this:
-device VGA,vgamem_mb=8,addr=0x4
But looks this may issue another problem. That is we can't see anything
until the vga driver is initialized. I means if we pass `-device
VGA,vgamem_mb=8,addr=0x4', qemu doesn't expose any vga interface to
BIOS. Right? Or I'm still missing something.
Thanks
Tiejun
