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    SubjectRe: [RFC PATCH 0/3] generic hypercall support
    Marcelo Tosatti wrote:
    >>> Also it would be interesting to see the MMIO comparison with EPT/NPT,
    >>> it probably sucks much less than what you're seeing.
    >> Why would NPT improve mmio? If anything, it would be worse, since the
    >> processor has to do the nested walk.
    > I suppose the hardware is much more efficient than walk_addr? There's
    > all this kmalloc, spinlock, etc overhead in the fault path.

    mmio still has to do a walk_addr, even with npt. We don't take the mmu
    lock during walk_addr.

    Do not meddle in the internals of kernels, for they are subtle and quick to panic.

     \ /
      Last update: 2009-05-08 13:41    [W:0.018 / U:55.904 seconds]
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