• Andrey Smetanin's avatar
    kvm/x86: Hyper-V SynIC timers · 1f4b34f8
    Andrey Smetanin authored
    Per Hyper-V specification (and as required by Hyper-V-aware guests),
    SynIC provides 4 per-vCPU timers.  Each timer is programmed via a pair
    of MSRs, and signals expiration by delivering a special format message
    to the configured SynIC message slot and triggering the corresponding
    synthetic interrupt.
    Note: as implemented by this patch, all periodic timers are "lazy"
    (i.e. if the vCPU wasn't scheduled for more than the timer period the
    timer events are lost), regardless of the corresponding configuration
    MSR.  If deemed necessary, the "catch up" mode (the timer period is
    shortened until the timer catches up) will be implemented later.
    Changes v2:
    * Use remainder to calculate periodic timer expiration time
    Signed-off-by: default avatarAndrey Smetanin <asmetanin@virtuozzo.com>
    Reviewed-by: default avatarRoman Kagan <rkagan@virtuozzo.com>
    CC: Gleb Natapov <gleb@kernel.org>
    CC: Paolo Bonzini <pbonzini@redhat.com>
    CC: "K. Y. Srinivasan" <kys@microsoft.com>
    CC: Haiyang Zhang <haiyangz@microsoft.com>
    CC: Vitaly Kuznetsov <vkuznets@redhat.com>
    CC: Roman Kagan <rkagan@virtuozzo.com>
    CC: Denis V. Lunev <den@openvz.org>
    CC: qemu-devel@nongnu.org
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
hyperv.h 2.47 KB