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    xen: SMP guest support · f87e4cac
    Jeremy Fitzhardinge 提交于
    This is a fairly straightforward Xen implementation of smp_ops.
    
    Xen has its own IPI mechanisms, and has no dependency on any
    APIC-based IPI.  The smp_ops hooks and the flush_tlb_others pv_op
    allow a Xen guest to avoid all APIC code in arch/i386 (the only apic
    operation is a single apic_read for the apic version number).
    
    One subtle point which needs to be addressed is unpinning pagetables
    when another cpu may have a lazy tlb reference to the pagetable. Xen
    will not allow an in-use pagetable to be unpinned, so we must find any
    other cpus with a reference to the pagetable and get them to shoot
    down their references.
    Signed-off-by: NJeremy Fitzhardinge <jeremy@xensource.com>
    Signed-off-by: NChris Wright <chrisw@sous-sol.org>
    Cc: Benjamin LaHaise <bcrl@kvack.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Andi Kleen <ak@suse.de>
    f87e4cac
events.c 13.4 KB