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    SubjectRe: [RFC] Unify KVM kernel-space and user-space code into a single project
    On Wed, Mar 24, 2010 at 05:49:42PM +0200, Avi Kivity wrote:
    > On 03/24/2010 05:46 PM, Joerg Roedel wrote:
    >> On Wed, Mar 24, 2010 at 05:12:55PM +0200, Avi Kivity wrote:
    >>
    >>> On 03/24/2010 05:01 PM, Joerg Roedel wrote:
    >>>
    >>>> $ cd /sys/kvm/guest0
    >>>> $ ls -l
    >>>> -r-------- 1 root root 0 2009-08-17 12:05 name
    >>>> dr-x------ 1 root root 0 2009-08-17 12:05 fs
    >>>> $ cat name
    >>>> guest0
    >>>> $ # ...
    >>>>
    >>>> The fs/ directory is used as the mount point for the guest root fs.
    >>>>
    >>> The problem is /sys/kvm, not /sys/kvm/fs.
    >>>
    >> I am not tied to /sys/kvm. We could also use /proc/<pid>/kvm/ for
    >> example. This would keep anything in the process space (except for the
    >> global list of VMs which we should have anyway).
    >>
    >
    > How about ~/.qemu/guests/$pid?

    That makes it hard for perf to find it and even harder to get a list of
    all VMs. With /proc/<pid>/kvm/guest we could symlink all guest
    directories to /proc/kvm/ and perf reads the list from there. Also perf
    can easily derive the directory for a guest from its pid.
    Last but not least its kernel-created and thus independent from the
    userspace part being used.

    Joerg



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