From: Christoph Hellwig <hch@lst.de>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Alexey Kardashevskiy <aik@linux.ibm.com>,
Ram Pai <linuxram@us.ibm.com>,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Paul Mackerras <paulus@ozlabs.org>,
iommu@lists.linux-foundation.org, Christoph Hellwig <hch@lst.de>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [RFC PATCH] virtio_ring: Use DMA API if guest memory is encrypted
Date: Mon, 12 Aug 2019 14:15:32 +0200 [thread overview]
Message-ID: <20190812121532.GB9405__40866.7919387639$1565612150$gmane$org@lst.de> (raw)
In-Reply-To: <20190811044431-mutt-send-email-mst@kernel.org>
On Sun, Aug 11, 2019 at 04:55:27AM -0400, Michael S. Tsirkin wrote:
> On Sun, Aug 11, 2019 at 07:56:07AM +0200, Christoph Hellwig wrote:
> > So we need a flag on the virtio device, exposed by the
> > hypervisor (or hardware for hw virtio devices) that says: hey, I'm real,
> > don't take a shortcut.
>
> The point here is that it's actually still not real. So we would still
> use a physical address. However Linux decides that it wants extra
> security by moving all data through the bounce buffer. The distinction
> made is that one can actually give device a physical address of the
> bounce buffer.
Sure. The problem is just that you keep piling hacks on top of hacks.
We need the per-device flag anyway to properly support hardware virtio
device in all circumstances. Instead of coming up with another ad-hoc
hack to force DMA uses implement that one proper bit and reuse it here.
next prev parent reply other threads:[~2019-08-12 12:15 UTC|newest]
Thread overview: 198+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-29 17:08 [RFC PATCH] virtio_ring: Use DMA API if guest memory is encrypted Thiago Jung Bauermann
2019-01-29 17:08 ` Thiago Jung Bauermann
2019-01-29 17:42 ` Thiago Jung Bauermann
2019-01-29 17:42 ` Thiago Jung Bauermann
2019-01-29 19:02 ` Michael S. Tsirkin
2019-01-29 19:02 ` Michael S. Tsirkin
2019-01-30 2:24 ` Jason Wang
2019-01-30 2:24 ` Jason Wang
2019-01-30 2:36 ` Michael S. Tsirkin
2019-01-30 2:36 ` Michael S. Tsirkin
2019-01-30 2:36 ` Michael S. Tsirkin
2019-01-30 3:05 ` Jason Wang
2019-01-30 3:05 ` Jason Wang
2019-01-30 3:05 ` Jason Wang
2019-01-30 3:26 ` Michael S. Tsirkin
2019-01-30 3:26 ` Michael S. Tsirkin
2019-01-30 3:26 ` Michael S. Tsirkin
2019-01-30 7:44 ` Christoph Hellwig
2019-01-30 7:44 ` Christoph Hellwig
2019-01-30 7:44 ` Christoph Hellwig
2019-02-04 18:15 ` Thiago Jung Bauermann
2019-02-04 18:15 ` Thiago Jung Bauermann
2019-02-04 18:15 ` Thiago Jung Bauermann
2019-02-04 21:38 ` Michael S. Tsirkin
2019-02-04 21:38 ` Michael S. Tsirkin
2019-02-05 7:24 ` Christoph Hellwig
2019-02-05 7:24 ` Christoph Hellwig
2019-02-05 16:13 ` Michael S. Tsirkin
2019-02-05 16:13 ` Michael S. Tsirkin
2019-02-05 16:13 ` Michael S. Tsirkin
2019-02-05 16:13 ` Michael S. Tsirkin
2019-02-05 7:24 ` Christoph Hellwig
2019-02-04 21:38 ` Michael S. Tsirkin
2019-03-26 16:53 ` Michael S. Tsirkin
2019-03-26 16:53 ` Michael S. Tsirkin
2019-03-26 16:53 ` Michael S. Tsirkin
2019-01-30 2:24 ` Jason Wang
2019-02-04 18:14 ` Thiago Jung Bauermann
2019-02-04 18:14 ` Thiago Jung Bauermann
2019-02-04 18:14 ` Thiago Jung Bauermann
2019-02-04 20:23 ` Michael S. Tsirkin
2019-02-04 20:23 ` Michael S. Tsirkin
2019-03-20 16:13 ` Thiago Jung Bauermann
2019-03-20 16:13 ` Thiago Jung Bauermann
2019-03-20 16:13 ` Thiago Jung Bauermann
2019-03-20 21:17 ` Michael S. Tsirkin
2019-03-20 21:17 ` Michael S. Tsirkin
2019-03-20 21:17 ` Michael S. Tsirkin
2019-03-22 0:05 ` Thiago Jung Bauermann
2019-03-22 0:05 ` Thiago Jung Bauermann
2019-03-22 0:05 ` Thiago Jung Bauermann
2019-03-23 21:01 ` Michael S. Tsirkin
2019-03-23 21:01 ` Michael S. Tsirkin
2019-03-23 21:01 ` Michael S. Tsirkin
2019-03-25 0:57 ` David Gibson
2019-03-25 0:57 ` David Gibson
2019-03-25 0:57 ` David Gibson
2019-04-17 21:42 ` Thiago Jung Bauermann
2019-04-17 21:42 ` Thiago Jung Bauermann
2019-04-17 21:42 ` Thiago Jung Bauermann
2019-04-17 21:42 ` Thiago Jung Bauermann
2019-04-17 21:42 ` Thiago Jung Bauermann
2019-04-17 21:42 ` Thiago Jung Bauermann
2019-04-17 21:42 ` Thiago Jung Bauermann
2019-04-17 21:42 ` Thiago Jung Bauermann
2019-04-17 21:42 ` Thiago Jung Bauermann
2019-04-19 23:09 ` Michael S. Tsirkin
2019-04-19 23:09 ` Michael S. Tsirkin
2019-04-19 23:09 ` Michael S. Tsirkin
2019-04-19 23:09 ` Michael S. Tsirkin
2019-04-25 1:01 ` Thiago Jung Bauermann
2019-04-25 1:01 ` Thiago Jung Bauermann
2019-04-25 1:01 ` Thiago Jung Bauermann
2019-04-25 1:18 ` Michael S. Tsirkin
2019-04-25 1:18 ` Michael S. Tsirkin
2019-04-25 1:18 ` Michael S. Tsirkin
2019-04-25 1:18 ` Michael S. Tsirkin
2019-04-25 1:18 ` Michael S. Tsirkin
2019-04-26 23:56 ` Thiago Jung Bauermann
2019-04-26 23:56 ` Thiago Jung Bauermann
2019-04-26 23:56 ` Thiago Jung Bauermann
2019-04-26 23:56 ` Thiago Jung Bauermann
2019-05-20 13:08 ` Michael S. Tsirkin
2019-05-20 13:08 ` Michael S. Tsirkin
2019-05-20 13:08 ` Michael S. Tsirkin
2019-05-20 13:08 ` Michael S. Tsirkin
2019-04-25 1:01 ` Thiago Jung Bauermann
2019-05-20 13:16 ` Michael S. Tsirkin
2019-05-20 13:16 ` Michael S. Tsirkin
2019-05-20 13:16 ` Michael S. Tsirkin
2019-05-20 13:16 ` Michael S. Tsirkin
2019-06-04 1:13 ` Thiago Jung Bauermann
2019-06-04 1:13 ` Thiago Jung Bauermann
2019-06-04 1:13 ` Thiago Jung Bauermann
2019-06-04 1:42 ` Michael S. Tsirkin
2019-06-04 1:42 ` Michael S. Tsirkin
2019-06-04 1:42 ` Michael S. Tsirkin
2019-06-04 1:42 ` Michael S. Tsirkin
2019-06-28 1:58 ` Thiago Jung Bauermann
2019-06-28 1:58 ` Thiago Jung Bauermann
2019-06-28 1:58 ` Thiago Jung Bauermann
2019-06-28 1:58 ` Thiago Jung Bauermann
2019-07-01 14:17 ` Michael S. Tsirkin
2019-07-01 14:17 ` Michael S. Tsirkin
2019-07-01 14:17 ` Michael S. Tsirkin
2019-07-01 14:17 ` Michael S. Tsirkin
2019-07-14 5:51 ` Thiago Jung Bauermann
2019-07-14 5:51 ` Thiago Jung Bauermann
2019-07-14 5:51 ` Thiago Jung Bauermann
2019-07-14 5:51 ` Thiago Jung Bauermann
2019-07-15 14:35 ` Michael S. Tsirkin
2019-07-15 14:35 ` Michael S. Tsirkin
2019-07-15 14:35 ` Michael S. Tsirkin
2019-07-15 14:35 ` Michael S. Tsirkin
2019-07-15 20:29 ` Thiago Jung Bauermann
2019-07-15 20:29 ` Thiago Jung Bauermann
2019-07-15 20:29 ` Thiago Jung Bauermann
2019-07-15 20:36 ` Michael S. Tsirkin
2019-07-15 20:36 ` Michael S. Tsirkin
2019-07-15 20:36 ` Michael S. Tsirkin
2019-07-15 20:36 ` Michael S. Tsirkin
2019-07-15 22:03 ` Thiago Jung Bauermann
2019-07-15 22:03 ` Thiago Jung Bauermann
2019-07-15 22:03 ` Thiago Jung Bauermann
2019-07-15 22:03 ` Thiago Jung Bauermann
2019-07-15 22:16 ` Michael S. Tsirkin
2019-07-15 22:16 ` Michael S. Tsirkin
2019-07-15 22:16 ` Michael S. Tsirkin
2019-07-15 22:16 ` Michael S. Tsirkin
2019-07-15 23:05 ` Thiago Jung Bauermann
2019-07-15 23:05 ` Thiago Jung Bauermann
2019-07-15 23:05 ` Thiago Jung Bauermann
2019-07-15 23:05 ` Thiago Jung Bauermann
2019-07-15 23:24 ` Benjamin Herrenschmidt
2019-07-15 23:24 ` Benjamin Herrenschmidt
2019-07-15 23:24 ` Benjamin Herrenschmidt
2019-07-15 23:24 ` Benjamin Herrenschmidt
2019-07-15 20:29 ` Thiago Jung Bauermann
2019-07-18 3:39 ` Thiago Jung Bauermann
2019-07-18 3:39 ` Thiago Jung Bauermann
2019-07-18 3:39 ` Thiago Jung Bauermann
2019-06-04 1:13 ` Thiago Jung Bauermann
2019-03-20 16:13 ` Thiago Jung Bauermann
2019-02-04 20:23 ` Michael S. Tsirkin
2019-01-29 19:02 ` Michael S. Tsirkin
2019-01-29 17:42 ` Thiago Jung Bauermann
2019-08-10 18:57 ` Michael S. Tsirkin
2019-08-10 18:57 ` Michael S. Tsirkin
2019-08-10 18:57 ` Michael S. Tsirkin
2019-08-10 22:07 ` Ram Pai
2019-08-10 22:07 ` Ram Pai
2019-08-10 22:07 ` Ram Pai
2019-08-11 5:56 ` Christoph Hellwig
2019-08-11 5:56 ` Christoph Hellwig
2019-08-11 5:56 ` Christoph Hellwig
2019-08-11 6:46 ` Ram Pai
2019-08-11 6:46 ` Ram Pai
2019-08-11 6:46 ` Ram Pai
2019-08-11 8:44 ` Michael S. Tsirkin
2019-08-11 8:44 ` Michael S. Tsirkin
2019-08-11 8:44 ` Michael S. Tsirkin
2019-08-12 12:13 ` Christoph Hellwig
2019-08-12 12:13 ` Christoph Hellwig
2019-08-12 12:13 ` Christoph Hellwig
2019-08-12 20:29 ` Ram Pai
2019-08-12 20:29 ` Ram Pai
2019-08-12 20:29 ` Ram Pai
2019-08-11 8:42 ` Michael S. Tsirkin
2019-08-11 8:42 ` Michael S. Tsirkin
2019-08-11 8:42 ` Michael S. Tsirkin
2019-08-11 8:55 ` Michael S. Tsirkin
2019-08-11 8:55 ` Michael S. Tsirkin
2019-08-11 8:55 ` Michael S. Tsirkin
2019-08-12 12:15 ` Christoph Hellwig [this message]
2019-08-12 12:15 ` Christoph Hellwig
2019-08-12 12:15 ` Christoph Hellwig
2019-09-06 5:07 ` Michael S. Tsirkin
2019-09-06 5:07 ` Michael S. Tsirkin
2019-09-06 5:07 ` Michael S. Tsirkin
2019-08-12 9:51 ` David Gibson
2019-08-12 9:51 ` David Gibson
2019-08-12 9:51 ` David Gibson
2019-08-13 13:26 ` Christoph Hellwig
2019-08-13 13:26 ` Christoph Hellwig
2019-08-13 14:24 ` David Gibson
2019-08-13 14:24 ` David Gibson
2019-08-13 15:45 ` Ram Pai
2019-08-13 15:45 ` Ram Pai
2019-08-13 15:45 ` Ram Pai
2019-08-26 17:48 ` Ram Pai
2019-08-26 17:48 ` Ram Pai
2019-08-26 17:48 ` Ram Pai
2019-08-13 14:24 ` David Gibson
2019-08-13 13:26 ` Christoph Hellwig
2019-08-11 8:12 ` Michael S. Tsirkin
2019-08-11 8:12 ` Michael S. Tsirkin
2019-08-11 8:12 ` Michael S. Tsirkin
-- strict thread matches above, loose matches on Subject: below --
2019-01-29 17:08 Thiago Jung Bauermann
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