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    SubjectRe: [Qemu-devel] [PATCH 2/2] kvm: exit to userspace with reason KVM_EXIT_VCPU_DEAD
    On Sun, Nov 27, 2011 at 12:36:55PM +0200, Avi Kivity wrote:
    > On 11/27/2011 04:42 AM, Liu Ping Fan wrote:
    > > From: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
    > >
    > > The vcpu can be safely released when
    > > --1.guest tells us that the vcpu is not needed any longer.
    > > --2.vcpu hits the last instruction _halt_
    > >
    > > If both of the conditions are satisfied, kvm exits to userspace
    > > with the reason vcpu dead. So the user thread can exit safely.
    > >
    > >
    >
    > Seems to be completely unnecessary. If you want to exit from the vcpu
    > thread, send it a signal.
    >
    Also if guest "tells us that the vcpu is not needed any longer" (via
    ACPI I presume) and vcpu actually doing something critical instead of
    sitting in 1:hlt; jmp 1b loop then it is guest's problem if it stops
    working after vcpu destruction.

    --
    Gleb.


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