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 PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 09 Apr 2007 12:50:18 +1000 From: Rusty Russell <rusty@...tcorp.com.au> To: Avi Kivity <avi@...ranet.com> Cc: Ingo Molnar <mingo@...e.hu>, kvm-devel@...ts.sourceforge.net, netdev <netdev@...r.kernel.org> Subject: Re: [kvm-devel] QEMU PIC indirection patch for in-kernel APIC work On Sun, 2007-04-08 at 08:36 +0300, Avi Kivity wrote: > Rusty Russell wrote: > > Hi Avi, > > > > I don't think you've thought about this very hard. The receive copy is > > completely independent with whether the packet is going to the guest via > > a kernel driver or via userspace, so not relevant. > > > > A packet received in the kernel cannot be made available to userspace in > a safe manner without a copy, as it will not be aligned with page > boundaries, so userspace cannot examine the packet until after one copy > has occured. Hi Avi! I'm a little puzzled by your response. Hmm... lguest's userspace network frontend does exactly as many copies as Ingo's in-host-kernel code. One from the Guest, one to the Guest. Does that clarify? Rusty. - 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
Powered by blists - more mailing lists