linux-kernel - Re: [PATCH v1 0/2] Virtio: fix some vq allocation issues

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Date:   Thu, 03 Jan 2019 14:18:22 +0800
From:   Wei Wang <wei.w.wang@...el.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>,
        virtio-dev@...ts.oasis-open.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        mst@...hat.com, cohuck@...hat.com
CC:     pbonzini@...hat.com, dgilbert@...hat.com,
        Halil Pasic <pasic@...ux.ibm.com>
Subject: Re: [PATCH v1 0/2] Virtio: fix some vq allocation issues

On 12/28/2018 03:57 PM, Christian Borntraeger wrote:
>
> On 28.12.2018 03:26, Wei Wang wrote:
>> Some vqs don't need to be allocated when the related feature bits are
>> disabled. Callers notice the vq allocation layer by setting the related
>> names[i] to be NULL.
>>
>> This patch series fixes the find_vqs implementations to handle this case.
> So the random crashes during boot are gone.
> What still does not work is actually using the balloon.
>
> So in the qemu monitor using lets say "balloon 1000"  will hang the guest.
> Seems to be a deadlock in the virtio-ccw code.  We seem to call the
> config code in the interrupt handler.

Please try with applying both this series and the "virtio-balloon: tweak 
config_changed"
series that I just sent.
This series fixes the ccw booting issue and that series tries to fix the 
ccw deadlock issue.

Best,
Wei