On 03/05/2014 09:42 PM, hong-hua....@freescale.com wrote:
> Hi Gibson,
>
> I noticed your patch http://git.qemu.org/?p=qemu.git;a=commitdiff;h=89dfd6e1
> and have some question about PCI bus name on PowerPC.
>
> When I use libvirt to start VM on PowerPC platforms, it failed as below:
> # virsh start sdk
> error: Failed to start domain sdk
> error: internal error: early end of file from monitor: possible problem:
> qemu-system-ppc: -device piix3-usb-uhci,id=usb,bus=pci,addr=0x1: Bus 'pci'
> not found
I just tried current upstresm QEMU and it handles bus=pci fine, it prints
an error on bus=pci.0 so I am confused - what qemu are you trying?
I am adding our libvirt developer Li, she might help with this.
> Exactly it should be 'pci.0' according to the default qdev core logic.
>
> But currently in libvirt it only recognize PCI bus name as 'pci.0' on
> x86_64/i686 Arch.
> -------------------------------------------------------------------
> libvirt/src/qemu/qemu_capabilities.c
> /* Currently only x86_64 and i686 support PCI-multibus. */
> if (qemuCaps->arch == VIR_ARCH_X86_64 ||
> qemuCaps->arch == VIR_ARCH_I686) {
> virQEMUCapsSet(qemuCaps, QEMU_CAPS_PCI_MULTIBUS);
>
> libvirt/src/qemu/qemu_capabilities.h:
> QEMU_CAPS_PCI_MULTIBUS = 52, /* bus=pci.0 vs bus=pci */
> -------------------------------------------------------------------
>
> Looking at 'info qtree' output it seems "pseries" is the only PPC machine
> type
> using "pci" (out of those we managed to run):
>
> $ ./ppc64-softmmu/qemu-system-ppc64 -M ?
> Supported machines are:
> virtex-ml507 Xilinx Virtex ML507 reference design
> pseries pSeries Logical Partition (PAPR compliant) (default)
> prep PowerPC PREP platform
> bamboo bamboo
> ref405ep ref405ep
> taihu taihu
> mpc8544ds mpc8544ds
> g3beige Heathrow based PowerMAC
> mac99 Mac99 based PowerMAC
> ppce500 generic paravirt e500 platform
> none empty machine
>
> 1) virtex-ml507
> 2) pseries
> Warning: Disabling some instructions which are not emulated by TCG (0x0, 0x4)
> bus: pci
> 3) prep
> bus: pci.0
> 4) bamboo
> bus: pci.0
> 5) ref405ep
> qemu-system-ppc64: Could not load PowerPC BIOS 'ppc405_rom.bin'
> 6) taihu
> qemu-system-ppc64: Could not load PowerPC BIOS 'ppc405_rom.bin'
> 7) mpc8544ds
> bus: pci.0
> 8) g3beige
> bus: pci.0
> 9) mac99
> bus: pci.0
> 10) ppce500
> bus: pci.0
>
>
> Could pseries also use 'pci.0' as PCI bus name?
> If yes, could we set QEMU_CAPS_PCI_MULTIBUS in libvirt for all the
> PowerPC platforms? Otherwise, we need detect the machine to fix this issue.
>
> The discussion in libvirt mailing list is here:
> https://www.redhat.com/archives/libvir-list/2014-March/msg00228.html
>
> I think we need reach an agreement in QEMU and then work on libvirt.
>
> Best Regards,
> Olivia
>
--
Alexey
