Re: [PATCH 0/2] vhot-net: Use kvm_memslots instead of vhost_memory totranslate GPA to HVA

[Zang Hongyong]

ä 2011/12/16,ææä 15:05, Sasha Levin åé:
> On Fri, 2011-12-16 at 13:32 +0800, zanghongyong@xxxxxxxxxx wrote:
> > From: Hongyong Zang<zanghongyong@xxxxxxxxxx>
> >
> > 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?
But vhost-net is only used in virtualization situation. vhost_memory is 
maintained
by user space qemu.
In this way, the memory relationship can be accquired from kernel 
without the
need of maintainence of vhost_memory from qemu.

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