linux-kernel - Re: [PATCH v1 2/2] virtio-mmio: add features for virtio-mmio specification version 3

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Message-ID: <20200105054142-mutt-send-email-mst@kernel.org>
Date:   Sun, 5 Jan 2020 05:42:49 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     "Liu, Jiang" <gerry@...ux.alibaba.com>
Cc:     Jason Wang <jasowang@...hat.com>,
        Zha Bin <zhabin@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org, slp@...hat.com,
        virtio-dev@...ts.oasis-open.org, jing2.liu@...el.com,
        chao.p.peng@...el.com
Subject: Re: [PATCH v1 2/2] virtio-mmio: add features for virtio-mmio
 specification version 3

On Thu, Dec 26, 2019 at 09:16:19PM +0800, Liu, Jiang wrote:
> > 2) The mask and unmask control is missed
> > 
> > 
> >>  but the extension doesn’t support 3) because
> >> we noticed that the Linux virtio subsystem doesn’t really make use of interrupt masking/unmasking.

Linux uses masking/unmasking in order to migrate interrupts between
CPUs.

-- 
MST