linux-kernel - Re: [PATCH V2 0/5] rework on the IRQ hardening of virtio

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Date:   Thu, 7 Apr 2022 14:12:27 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, maz@...nel.org, tglx@...utronix.de,
        peterz@...radead.org, sgarzare@...hat.com
Subject: Re: [PATCH V2 0/5] rework on the IRQ hardening of virtio


在 2022/4/6 下午7:36, Michael S. Tsirkin 写道:
> On Wed, Apr 06, 2022 at 04:35:33PM +0800, Jason Wang wrote:
>> Hi All:
>>
>> This is a rework on the IRQ hardening for virtio which is done
>> previously by the following commits are reverted:
>>
>> 9e35276a5344 ("virtio_pci: harden MSI-X interrupts")
>> 080cd7c3ac87 ("virtio-pci: harden INTX interrupts")
>>
>> The reason is that it depends on the IRQF_NO_AUTOEN which may conflict
>> with the assumption of the affinity managed IRQ that is used by some
>> virtio drivers. And what's more, it is only done for virtio-pci but
>> not other transports.
>>
>> In this rework, I try to implement a general virtio solution which
>> borrows the idea of the INTX hardening by introducing a boolean for
>> virtqueue callback enabling and toggle it in virtio_device_ready()
>> and virtio_reset_device(). Then vring_interrupt() can simply check and
>> return early if the driver is not ready.
>
> All of a sudden all patches are having a wrong mime type.
>
> It is application/octet-stream; should be text/plain
>
> Pls fix and repost, thanks!


So the patches are generated via git-format-patch and git-send-email in 
one run.

I can see many upstream patches were converted to 
application/octet-stream if From: tag is different from the sender.

Maxime told me they've also noticed the issue and it looks like a issue 
of mimecast.

Thanks


>
>> Please review.
>>
>> Changes since v1:
>>
>> - Use transport specific irq synchronization method when possible
>> - Drop the module parameter and enable the hardening unconditonally
>> - Tweak the barrier/ordering facilities used in the code
>> - Reanme irq_soft_enabled to driver_ready
>> - Avoid unnecssary IRQ synchornization (e.g during boot)
>>
>> Jason Wang (4):
>>    virtio: use virtio_reset_device() when possible
>>    virtio: introduce config op to synchronize vring callbacks
>>    virtio-pci: implement synchronize_vqs()
>>    virtio: harden vring IRQ
>>
>> Stefano Garzarella (1):
>>    virtio: use virtio_device_ready() in virtio_device_restore()
>>
>>   drivers/virtio/virtio.c            | 20 ++++++++++++++++----
>>   drivers/virtio/virtio_pci_common.c | 14 ++++++++++++++
>>   drivers/virtio/virtio_pci_common.h |  2 ++
>>   drivers/virtio/virtio_pci_legacy.c |  1 +
>>   drivers/virtio/virtio_pci_modern.c |  2 ++
>>   drivers/virtio/virtio_ring.c       |  9 ++++++++-
>>   include/linux/virtio.h             |  2 ++
>>   include/linux/virtio_config.h      | 24 ++++++++++++++++++++++++
>>   8 files changed, 69 insertions(+), 5 deletions(-)
>>
>> -- 
>> 2.25.1