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From: Pierre Morel <pmorel@linux.ibm.com>
To: "Michael S. Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>
Cc: linux-kernel@vger.kernel.org, pasic@linux.ibm.com,
	borntraeger@de.ibm.com, frankja@linux.ibm.com, cohuck@redhat.com,
	kvm@vger.kernel.org, linux-s390@vger.kernel.org,
	thomas.lendacky@amd.com, david@gibson.dropbear.id.au,
	linuxram@us.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com
Subject: Re: [PATCH v7 2/2] s390: virtio: PV needs VIRTIO I/O device protection
Date: Thu, 6 Aug 2020 16:19:23 +0200
Message-ID: <ef819e0e-85c3-0b14-4f8e-0d2a6c452355@linux.ibm.com> (raw)
In-Reply-To: <e41d039c-5fe2-b9db-093b-c0dddcc2ad4f@linux.ibm.com>

On 2020-07-30 13:31, Pierre Morel wrote:
>>>> What bothers me here is that arch code depends on virtio now.
>>>> It works even with a modular virtio when functions are inline,
>>>> but it seems fragile: e.g. it breaks virtio as an out of tree module,
>>>> since layout of struct virtio_device can change.
>>> The code was only called from virtio.c so it should be fine.
>>> And my understanding is that we don't need to care about the kABI issue
>>> during upstream development?
>>> Thanks
>> No, but so far it has been convenient at least for me, for development,
>> to just be able to unload all of virtio and load a different version.
>>>> I'm not sure what to do with this yet, will try to think about it
>>>> over the weekend. Thanks!

After reflection, I am not sure that this problem must be treated on the 
architecture level or inside the VIRTIO transport.
Consequently, I will propose another patch series based on CCW transport.
This also should be more convenient for core development.


Pierre Morel
IBM Lab Boeblingen

  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15  8:31 [PATCH v7 0/2] s390: virtio: let arch validate VIRTIO features Pierre Morel
2020-07-15  8:31 ` [PATCH v7 1/2] " Pierre Morel
2020-07-15  8:31 ` [PATCH v7 2/2] s390: virtio: PV needs VIRTIO I/O device protection Pierre Morel
2020-07-15  9:50   ` Michael S. Tsirkin
2020-07-15 10:16     ` Jason Wang
2020-07-15 11:51       ` Michael S. Tsirkin
2020-07-16 11:19         ` Christian Borntraeger
2020-07-16 21:46           ` Michael S. Tsirkin
2020-07-22 11:48         ` Pierre Morel
2020-07-30 11:31         ` Pierre Morel
2020-08-06 14:19           ` Pierre Morel [this message]
2020-07-15  8:36 ` [PATCH v7 0/2] s390: virtio: let arch validate VIRTIO features Jason Wang
2020-07-15  9:20 ` Cornelia Huck

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