netdev - Re: [RFC][PATCH v4 00/18] Provide a zero-copy method on KVM virtio-net.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20100425.025529.123989625.davem@davemloft.net>
Date:	Sun, 25 Apr 2010 02:55:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	xiaohui.xin@...el.com
Cc:	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com, mingo@...e.hu,
	jdike@...ux.intel.com
Subject: Re: [RFC][PATCH v4 00/18] Provide a zero-copy method on KVM
 virtio-net.

From: xiaohui.xin@...el.com
Date: Sun, 25 Apr 2010 17:20:06 +0800

> The idea is simple, just to pin the guest VM user space and then let
> host NIC driver has the chance to directly DMA to it.

Isn't it much easier to map the RX ring of the network device into the
guest's address space, have DMA map calls translate guest addresses to
physical/DMA addresses as well as do all of this crazy page pinning
stuff, and provide the translations and protections via the IOMMU?

What's being proposed here looks a bit over-engineered.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html