netdev - Re: [PATCH 0/2] vhot-net: Use kvm_memslots instead of vhost

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Date:	Fri, 16 Dec 2011 09:05:51 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	zanghongyong@...wei.com
Cc:	linux-kernel@...r.kernel.org, mst@...hat.com, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	xiaowei.yang@...wei.com, hanweidong@...wei.com,
	wusongwei@...wei.com
Subject: Re: [PATCH 0/2] vhot-net: Use kvm_memslots instead of vhost_memory
 to translate GPA to HVA

On Fri, 2011-12-16 at 13:32 +0800, zanghongyong@...wei.com wrote:
> From: Hongyong Zang <zanghongyong@...wei.com>
> 
> Vhost-net uses its own vhost_memory, which results from user space (qemu) info,
> to translate GPA to HVA. Since kernel's kvm structure already maintains the 
> address relationship in its member *kvm_memslots*, these patches use kernel's 
> kvm_memslots directly without the need of initialization and maintenance of 
> vhost_memory.

Conceptually, vhost isn't aware of KVM - it's just a driver which moves
data from vq to a tap device and back. You can't simply add KVM specific
code into vhost.

Whats the performance benefit?

-- 

Sasha.

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