Re: [Qemu-devel] ARM: PCI devices emulation broken with KVM due to cache issue

[Christoffer Dall]

On Thu, Apr 16, 2015 at 06:02:27PM +0200, Paolo Bonzini wrote:
> 
> 
> On 16/04/2015 17:54, Jérémy Fanguède wrote:
> > The guest kernel driver of the lsi device fails to enable it correctly
> > with a cache error:
> > [...]
> > sym53c8xx 0000:00:01.0: enabling device (0100 -> 0103)
> > sym0: <895a> rev 0x0 at pci 0000:00:01.0 irq 54
> > sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking
> > CACHE TEST FAILED: chip wrote 2, host read 1.
> > sym0: CACHE INCORRECTLY CONFIGURED.
> > sym0: giving up ...
> > [...]
> 
> Note that this is just a failure in the driver self-test.  It has
> nothing to do with the processor cache (though there are other problems
> with PCI and the processor cache in KVM mode).
> 
> Do not use this QEMU device.  The emulation is incomplete and it's slow.
>  Use virtio-scsi or megasas instead.  Still, I'm not sure that would
> work with KVM; as far as I know, most work on the ARM PCI host bridge
> was done using UEFI firmware.
> 
I've been running a number of tests lately using virtio-net-pci and
virtio-blk-pci on XGene at it works like a charm.

-Christoffer