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    SubjectRe: [kvm-devel] [PATCH 01/15] KVM: Use a shared page for kernel/user communication when runing a vcpu
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    On Wed, 2007-03-14 at 21:38 -0500, Hollis Blanchard wrote:
    > On Sun, 2007-03-11 at 15:53 +0200, Avi Kivity wrote:
    > > Instead of passing a 'struct kvm_run' back and forth between the
    > > kernel and userspace, allocate a page and allow the user to mmap() it.
    > > This reduces needless copying and makes the interface expandable by
    > > providing lots of free space.
    >
    > Do you provide for another means of accessing guest memory from host
    > userspace? For example, how do you attach a host debugger to the guest?
    >
    > Xen uses an ioctl followed by mmap for this purpose, which is why I
    > wonder about using mmap(/dev/kvm) for another purpose.

    Never mind: I see now that you have separate device nodes for the VM vs
    each vcpu.

    -Hollis

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