I started trying to pass through a PCI-E card to a KVM guest early this
year. Other hardware can be passed through successfully, but the guest
sees the wrong option ROM for this card.
My system is an AMD CPU and GA-970A-D3 motherboard. There are currently
two Radeon HD 3470 cards installed, partially so that I could read their
ROMs into a file.
The host OS is CentOS 6.3, and I've updated seabios and qemu to current
versions.
My guest is started with:
/usr/local/bin/qemu-system-x86_64 ... -vga cirrus \
-device pci-assign,host=05:00.0,id=hostdev1,configfd=27,\
bus=pci.0,addr=0x5,romfile=/var/lib/libvirt/images/Radeon3470-5.rom
However, when the guest tries to read the ROM for the ATI card, it's
seeing the ROM for the emulated cirrus card instead:
# strings /sys/devices/pci0000:00/0000:00:05.0/rom | head -4
Plex86/Bochs VGABios (PCI)
current-cvs 23 Sep 2012
(C) 2008 the LGPL VGABios developers Team
If I don't pass an emulated VGA device (and modify seabios to not run
the VGA ROM), the guess won't read anything from the rom at all.
Can anyone point me at which parts of the code I might review to see
where things are getting mapped and what's going wrong?
On the host system, lspci describes the device:
05:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI
RV620 PRO [Radeon HD 3470] (prog-if 00 [VGA controller])
Subsystem: Dell Device 3243
Flags: fast devsel, IRQ 26
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at fd9f0000 (64-bit, non-prefetchable) [size=64K]
I/O ports at ae00 [size=256]
Expansion ROM at fd900000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information <?>
Kernel driver in use: pci-stub
Kernel modules: radeon
and in the guest (Fedora 17):
00:05.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon
HD 3470 (prog-if 00 [VGA controller])
Subsystem: Dell Device 3243
Physical Slot: 5
Flags: fast devsel, IRQ 11
Memory at e0000000 (32-bit, non-prefetchable) [size=256M]
Memory at f2030000 (32-bit, non-prefetchable) [size=64K]
I/O ports at c100 [size=256]
Expansion ROM at f2040000 [disabled] [size=64K]
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [50] Power Management version 3
Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit-
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