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    SubjectRe: [patch 00/26] x64, x2apic/intr-remap: Interrupt-remapping and x2apic support
    On Sat, Jul 12, 2008 at 1:11 AM, Eric W. Biederman
    <> wrote:
    > "Yinghai Lu" <> writes:
    >>>> also read the x2APIC spec pdf, it doesn't say anything about interrupt
    >>>> remapping...need to be used with x2apic...
    >>> Clustered logical mode won't work as it requires > 16 bits of apicid.
    >>> So only flat physical mode will work.
    >> current read_apic_id in genx2apic_cluster and genx2apic_phys is the same...
    > There is a fixed defined mapping between logical & physical mappings,
    > so that may not be an issue.
    > A logical cluster apicid is encoded with the high 16bits being the
    > cluster number, and the low 16bits being a bitmap of which core
    > in the cluster to send the irq to. It sounded like a single
    > cluster can not span multiple sockets.
    > So in practice if you have 2 sockets you have a cluster id of 1.
    > Which means physical apic ids over 16 and logical apicids over 65536.
    is it like
    0x0001, 0x0002, 0x0004, 0x0008, ...., 0x8000 in one cluster? so every
    cluster only have 16


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