linux-kernel - Re: [PATCH v4 1/5] vsock/virtio: limit the memory used per-socket

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Date:   Tue, 3 Sep 2019 03:52:24 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        virtualization@...ts.linux-foundation.org,
        Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org
Subject: Re: [PATCH v4 1/5] vsock/virtio: limit the memory used per-socket

On Tue, Sep 03, 2019 at 09:45:54AM +0200, Stefano Garzarella wrote:
> On Tue, Sep 03, 2019 at 12:39:19AM -0400, Michael S. Tsirkin wrote:
> > On Mon, Sep 02, 2019 at 11:57:23AM +0200, Stefano Garzarella wrote:
> > > > 
> > > > Assuming we miss nothing and buffers < 4K are broken,
> > > > I think we need to add this to the spec, possibly with
> > > > a feature bit to relax the requirement that all buffers
> > > > are at least 4k in size.
> > > > 
> > > 
> > > Okay, should I send a proposal to virtio-dev@...ts.oasis-open.org?
> > 
> > How about we also fix the bug for now?
> 
> This series unintentionally fix the bug because we are introducing a way
> to split the packet depending on the buffer size ([PATCH 4/5] vhost/vsock:
> split packets to send using multiple buffers) and we removed the limit
> to 4K buffers ([PATCH 5/5] vsock/virtio: change the maximum packet size
> allowed).
> 
> I discovered that there was a bug while we discussed memory accounting.
> 
> Do you think it's enough while we introduce the feature bit in the spec?
> 
> Thanks,
> Stefano

Well locking is also broken (patch 3/5).  It seems that 3/5 and 4/5 work
by themselves, right?  So how about we ask Dave to send these to stable?
Also, how about 1/5? Also needed for stable?


-- 
MST