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Message-ID: <20090914164750.GB3745@redhat.com> Date: Mon, 14 Sep 2009 19:47:50 +0300 From: "Michael S. Tsirkin" <mst@...hat.com> To: Gregory Haskins <gregory.haskins@...il.com> Cc: "Ira W. Snyder" <iws@...o.caltech.edu>, netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...e.hu, linux-mm@...ck.org, akpm@...ux-foundation.org, hpa@...or.com, Rusty Russell <rusty@...tcorp.com.au>, s.hetze@...ux-ag.com Subject: Re: [PATCHv5 3/3] vhost_net: a kernel-level virtio server On Mon, Sep 14, 2009 at 12:08:55PM -0400, Gregory Haskins wrote: > For Ira's example, the addresses would represent a physical address on > the PCI boards, and would follow any kind of relevant rules for > converting a "GPA" to a host accessible address (even if indirectly, via > a dma controller). I don't think limiting addresses to PCI physical addresses will work well. From what I rememeber, Ira's x86 can not initiate burst transactions on PCI, and it's the ppc that initiates all DMA. > > > But we can't let the guest specify physical addresses. > > Agreed. Neither your proposal nor mine operate this way afaict. But this seems to be what Ira needs. > HTH > > Kind Regards, > -Greg > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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