On 09/28/13 20:51, Mark Salter wrote:
> On Fri, 2013-09-27 at 02:31 +0200, Laszlo Ersek wrote:
>> Hi Mark,
>>
>> just my 2 cents:
>>
>> On 09/26/13 21:33, Mark Salter wrote:
>>> I've been trying out this patch series on AArch64 foundation model.
>>> I have UEFI booting a linux kernel image in an EFI system partition.
>>> But the kernel itself doesn't see the virtio device. If I boot with
>>> an UEFI image without virtio support built in, the same kernel does
>>> see the virtio disk device.
>>>
>>> So, could this be a case of the UEFI virtio driver not releasing the
>>> virtio device?
>>
>> Interesting. We'd only know for sure if we debugged into the kernel
>> ("drivers/virtio/virtio_mmio.c" more precisely).
>
> Well, the virtio_blk probe fails with error of -ENOENT. I tracked that
> down to vm_setup_vq() in virtio_mmio.c:
>
> /* Queue shouldn't already be set up. */
> if (readl(vm_dev->base + VIRTIO_MMIO_QUEUE_PFN)) {
> err = -ENOENT;
> goto error_available;
> }
>
> --Mark
Could be a problem in the AArch64 foundation model. Both virtio-mmio and
virtio-pci in the guest seem to have good virtio_config_ops.reset
implementation, and the problem is not reproducible on virtio-pci. Maybe
the host/emulator is not forgetful enough.
Laszlo
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