Re: [RFC] kvmtool: add support for modern virtio-pci

[Sasha Levin <sasha.levin@oracle.com>]

On 11/19/2015 02:21 AM, Gerd Hoffmann wrote:
> On Mi, 2015-11-18 at 23:01 -0500, Sasha Levin wrote:
>> On 11/18/2015 11:00 PM, Sasha Levin wrote:
>>> Anyways, I debugged it for a bit a found that seabios attempts to write to
>>> the notification BAR, I look further tomorrow to narrow it down and fix it.
>>
>> Err, *read*, obviously.
>>
>> I've never implemented that because the kernel doesn't try to do that (it doesn't
>> make much sense, I think...).
> 
> It doesn't make sense indeed (kvmtool still shouldn't segfault though),
> and on a quick look I can't spot a place in seabios doing that ...
> 
> It's reading ISR, as part of device reset, to make sure any pending
> interrupts are cleared.

That was indeed the ISR field. Fixing that makes seabios reach the same point as
legacy virtio before failing.

I don't see the original correspondence about seabios failures you've reported, if
you want to forward them over we can look at it further.


Thanks,
Sasha