[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Signalling DomU on TPR write
Keir (and anyone else with an opinion on this :), Given that you have suggested that patching from the hypervisor might have synchronisation issues, my current thought on a mechanism for signalling a DomU when a TPR write occurs is this: . DomU allocates a page and makes a hypercall to the hypervisor saying "put info about TPR writes here" and use this event channel to signal me. . When a TPR write occurs, the hypervisor fills in the entry in the buffer nominated above and sets a flag. Until the flag is cleared, the hypervisor does no further signalling. . The guest sees the event (via the interrupt - same as any other event), patches the kernel as appropriate, then clears the flag . Repeat until all the places are patched. Obviously a number of iterations will be required before all the patching is done, but I don't think that's a problem. Patching would occur in the DomU with all processors at HIGH_LEVEL (interrupts disabled). Does that sound acceptable? Thanks James _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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