From: Christoph Hellwig <hch@infradead.org>
To: Keir Fraser <keirf@google.com>
Cc: Christoph Hellwig <hch@infradead.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>,
kernel-team@android.com,
virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] virtio: Force DMA restricted devices through DMA API
Date: Tue, 19 Jul 2022 22:16:47 -0700 [thread overview]
Message-ID: <YtePv+AT+pqD2wHe@infradead.org> (raw)
In-Reply-To: <YtbXxl8STUtQkacb@google.com>
On Tue, Jul 19, 2022 at 04:11:50PM +0000, Keir Fraser wrote:
> Well here are two possible approaches:
>
> 1. Revert e41b1355508d outright. I'm not even sure what it would mean
> for reported pages to go through IOMMU. And VIRTIO_F_ACCESS_PLATFORM
> is no longer IOMMU-specific anyway.
>
> 2. Continue to clear the flag during virtio_balloon negotiation, but
> remember that it was offered, and test for that in vring_use_dma_api()
> as well as, or instead of, virtio_has_dma_quirk().
>
> Do either of those appeal?
I'll have to defer to people that actually understand the virtio_balloon
code, because I haven't evey seriously looked at it.
next prev parent reply other threads:[~2022-07-20 5:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 10:02 [PATCH] virtio: Force DMA restricted devices through DMA API Keir Fraser
2022-07-19 11:56 ` Michael S. Tsirkin
2022-07-19 14:05 ` Keir Fraser
2022-07-19 21:31 ` Michael S. Tsirkin
2022-07-19 15:23 ` Christoph Hellwig
2022-07-19 15:46 ` Keir Fraser
2022-07-19 15:51 ` Christoph Hellwig
2022-07-19 16:11 ` Keir Fraser
2022-07-20 5:16 ` Christoph Hellwig [this message]
2022-07-20 6:59 ` Michael S. Tsirkin
2022-07-20 8:27 ` Keir Fraser
2022-07-20 9:58 ` Michael S. Tsirkin
2022-07-21 7:37 ` Keir Fraser
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