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    SubjectRe: [kvm-devel] [PATCH][RFC] pte notifiers -- support for external page tables
    Rusty Russell wrote:
    > On Wed, 2007-09-05 at 22:32 +0300, Avi Kivity wrote:
    >
    >> [resend due to bad alias expansion resulting in some recipients
    >> being bogus]
    >>
    >> Some hardware and software systems maintain page tables outside the normal
    >> Linux page tables, which reference userspace memory. This includes
    >> Infiniband, other RDMA-capable devices, and kvm (with a pending patch).
    >>
    >
    > And lguest. I can't tell until I've actually implemented it, but I
    > think it will seriously reduce the need for page pinning which is why
    > only root can currently launch guests.
    >
    >

    Ah yes, lguest.

    > My concern is locking: this is called with the page lock held, and I
    > guess we have to bump the guest out if it's currently running.
    >

    This will complicate kvm's locking too. We usually take kvm->lock to do
    mmu ops, but that is now a mutex.


    --
    Any sufficiently difficult bug is indistinguishable from a feature.

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