Re: [Qemu-devel] [PULL 12/23] virtio: use VRingMemoryRegionCaches for avail and used rings

[Paolo Bonzini]

On 21/02/2017 13:57, Gerd Hoffmann wrote:
> This change breaks ovmf for me, although it isn't obvious to me why.
> Bisect landed here, and reverting indeed makes things going again.
> 
> Using q35 machine type, pcie virtio devices, with the rhel ovmf build
> (OVMF-20160608b-1.git988715a.el7.noarch).
> 
> First thing I've tried is swapping virtio-net for another nic,
> suspecting this change might trigger a bug in the ovmf virtio-net
> driver, but that didn't change things.
> 
> Effect is that qemu just exits, without logging some error, looks like a
> normal guest shutdown.  Firmware log doesn't give a clue either, it just
> stops at some point, again without any error message.  Here are the last
> lines of the log:
> 
> SataControllerStart START
> SataControllerStart error return status = Already started
> SetPciIntLine: [00:1C.0] PciRoot(0x0)/Pci(0x1C,0x0) -> 0x0A
> SetPciIntLine: [01:00.0] PciRoot(0x0)/Pci(0x1C,0x0)/Pci(0x0,0x0) -> 0x0A
> SetPciIntLine: [00:1C.1] PciRoot(0x0)/Pci(0x1C,0x1) -> 0x0A
> SetPciIntLine: [02:00.0] PciRoot(0x0)/Pci(0x1C,0x1)/Pci(0x0,0x0) -> 0x0A
> SetPciIntLine: [00:1C.2] PciRoot(0x0)/Pci(0x1C,0x2) -> 0x0A
> SetPciIntLine: [00:1C.3] PciRoot(0x0)/Pci(0x1C,0x3) -> 0x0A
> SetPciIntLine: [00:1C.4] PciRoot(0x0)/Pci(0x1C,0x4) -> 0x0A
> SetPciIntLine: [05:00.0] PciRoot(0x0)/Pci(0x1C,0x4)/Pci(0x0,0x0) -> 0x0A
> SetPciIntLine: [05:00.1] PciRoot(0x0)/Pci(0x1C,0x4)/Pci(0x0,0x1) -> 0x0A
> SetPciIntLine: [05:00.2] PciRoot(0x0)/Pci(0x1C,0x4)/Pci(0x0,0x2) -> 0x0A
> SetPciIntLine: [00:1C.5] PciRoot(0x0)/Pci(0x1C,0x5) -> 0x0A
> SetPciIntLine: [06:00.0] PciRoot(0x0)/Pci(0x1C,0x5)/Pci(0x0,0x0) -> 0x0A
> SetPciIntLine: [00:1C.6] PciRoot(0x0)/Pci(0x1C,0x6) -> 0x0A
> SetPciIntLine: [00:1C.7] PciRoot(0x0)/Pci(0x1C,0x7) -> 0x0A
> SetPciIntLine: [00:1F.2] PciRoot(0x0)/Pci(0x1F,0x2) -> 0x0A
> SetPciIntLine: [00:1F.3] PciRoot(0x0)/Pci(0x1F,0x3) -> 0x0A
> Select Item: 0x8
> Select Item: 0x17
> qemu -kernel was not used.

Command line?  I tried with

x86_64-softmmu/qemu-system-x86_64 \
  -pflash /usr/share/edk2/ovmf/OVMF_CODE.fd \
  -pflash /usr/share/edk2/ovmf/OVMF_VARS.fd  \
  --enable-kvm -M q35 -debugcon stdio \
  -global isa-debugcon.iobase=0x402 \
  -net nic,model=virtio \
  -net bridge,helper=/usr/libexec/qemu-bridge-helper,br=virbr0 \
  -snapshot foo.raw

and after the above lines I get:

Select Item: 0x19
[Bds]OsIndication: 0000000000000000
[Bds]=============Begin Load Options Dumping ...=============
  Driver Options:
  SysPrep Options:
  Boot Options:
    Boot0000: UiApp              0x0109
    Boot0001: UEFI QEMU DVD-ROM QM00005                  0x0001
    Boot0002: UEFI QEMU HARDDISK QM00001                 0x0001
    Boot0003: EFI Internal Shell                 0x0001
  PlatformRecovery Options:
    PlatformRecovery0000: Default PlatformRecovery               0x0001

(but I'm using a different OVMF build,
edk2-ovmf-20161105git3b25ca8-2.fc25.noarch; dinner time now).

Thanks,

Paolo