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    SubjectRe: [PATCH v6 13/18] KVM: arm64: Support SDEI_EVENT_{COMPLETE,COMPLETE_AND_RESUME} hypercall
    On Sun, Apr 03, 2022 at 11:39:06PM +0800, Gavin Shan wrote:
    > This supports SDEI_EVENT_{COMPLETE, COMPLETE_AND_RESUME} hypercall.
    > They are used by guest to notify the completion of event in its
    > handler. The previously interrupted or preempted context is restored
    > like below.
    >
    > * x0 - x17, PC and PState are restored to what values we had in
    > the interrupted or preempted context.
    >
    > * If it's SDEI_EVENT_COMPLETE_AND_RESUME hypercall, IRQ exception
    > is injected.

    I don't think that's how COMPLETE_AND_RESUME works. The caller specifies an
    address at which it would like to begin execution within the client
    exception level.

    SDEI spec suggests this behaves like a synchronous exception. DEN 0054C
    5.2.2 'Event Resume Context' speaks more about how it is supposed to
    work.

    --
    Thanks,
    Oliver

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