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From: "Michael S. Tsirkin" <mst@redhat.com>
To: Linhaifeng <haifeng.lin@huawei.com>
Cc: qemu-devel@nongnu.org, n.nikolaev@virtualopensystems.com,
	jerry.lilijun@huawei.com
Subject: [Qemu-devel]  vhost-user: VHOST_SET_MEM_TABLE, VHOST_SET_VRING_CALL need a reply?
Date: Wed, 17 Sep 2014 11:38:15 +0300	[thread overview]
Message-ID: <20140917083815.GA10450@redhat.com> (raw)

Reply-To: 

Thinking about the vhost-user protocol, VHOST_SET_MEM_TABLE
is used to update the memory mappings.

So shouldn't we want for response?
Otherwise e.g. guest can start using the memory
that vhost-user can't access.

Similarly, with an IOMMU vhost-user might access memory it shouldn't.

VHOST_SET_VRING_CALL is used for MSI-X masking.
Again, after vector is masted by switching the call fd,
backend shouldn't assert the old one.

Thoughts?

             reply	other threads:[~2014-09-17  8:35 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-17  8:38 Michael S. Tsirkin [this message]
2014-09-17  9:39 ` [Qemu-devel] vhost-user: VHOST_SET_MEM_TABLE, VHOST_SET_VRING_CALL need a reply? Linhaifeng
2014-09-17  9:56   ` Michael S. Tsirkin
2014-09-18  0:45     ` Linhaifeng
2014-09-18  5:16       ` Michael S. Tsirkin
2014-09-18 12:39         ` Linhaifeng
2014-09-18 12:54           ` Michael S. Tsirkin
2014-09-18  2:39     ` Linhaifeng
2014-09-18  5:19       ` Michael S. Tsirkin

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