Re: [PATCH 2/2] vhost_net: a kernel-level virtio server

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, 14 Aug 2009 12:23:46 am Arnd Bergmann wrote:
> On Thursday 13 August 2009, Michael S. Tsirkin wrote:
> > The best way to do this IMO would be to add zero copy support to raw
> > sockets, vhost will then get it basically for free.
> 
> Yes, that would be nice. I wonder if that could lead to security
> problems on TX though. I guess It will only bring significant performance
> improvements if we leave the data writable in the user space or guest
> during the operation. If the user finds the right timing, it could
> modify the frame headers after they have been checked using netfilter,
> or while the frames are being consumed in the kernel (e.g. an NFS
> server running in a guest).

For this reason, we always linearize parts of packets we're filtering.
ie. copy.

Cheers,
Rusty.
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux