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authorRusty Russell <rusty@rustcorp.com.au>2007-11-12 13:39:18 +1100
committerRusty Russell <rusty@rustcorp.com.au>2007-11-12 13:59:40 +1100
commit42b36cc0ce717deeb10030141a43dede763a3ebe (patch)
treeb2dc48b4f16c5dc59461ad24b027d631edda1da4 /net
parent1200e646ae238afc536be70257290eb33fb6e364 (diff)
virtio: Force use of power-of-two for descriptor ring sizes
The virtio descriptor rings of size N-1 were nicely set up to be aligned to an N-byte boundary. But as Anthony Liguori points out, the free-running indices used by virtio require that the sizes be a power of 2, otherwise we get problems on wrap (demonstrated with lguest). So we replace the clever "2^n-1" scheme with a simple "align to page boundary" scheme: this means that all virtio rings take at least two pages, but it's safer than guessing cache alignment. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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