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    Subject[PATCH 0/7] PV on HVM: receive interrupts as xen events
    Hi all,
    this patch series introduces some performance improvements for xen PV on
    HVM guests: interacting with the emulated APIC is slow because it causes
    traps in the hypervisor while receiving xen events using the vector callback
    mechanism allow us to skip all that. For this reason we remap interrupts
    and MSIs into xen pirqs so that from that point on we can receive them
    as xen events instead.
    This series is based on Konrad's pcifront series (not upstream yet):

    http://lkml.org/lkml/2010/8/4/374

    and requires a patch to xen and a patch to qemu-xen (just sent to
    xen-devel).


    The list of patches with diffstat follows:

    Jeremy Fitzhardinge (2):
    xen: add xen hvm acpi_register_gsi variant
    acpi: use indirect call to register gsi in different modes

    Stefano Stabellini (5):
    xen: xen: map MSIs into pirqs
    xen: support GSI -> pirq remapping in PV on HVM guests
    xen: implement xen_hvm_register_pirq
    xen: get the maximum number of pirqs from xen
    xen: support pirq != irq


    arch/x86/include/asm/acpi.h | 3 +
    arch/x86/include/asm/xen/pci.h | 10 +++
    arch/x86/kernel/acpi/boot.c | 60 ++++++++++++++------
    arch/x86/pci/xen.c | 114 ++++++++++++++++++++++++++++++++++++++
    drivers/pci/xen-pcifront.c | 2 +-
    drivers/xen/events.c | 106 +++++++++++++++++++++++++++++++----
    include/xen/events.h | 3 +
    include/xen/interface/features.h | 3 +
    include/xen/interface/physdev.h | 36 ++++++++++++
    9 files changed, 308 insertions(+), 29 deletions(-)


    A git tree with this series and Konrad's pcifront series on top of Linux
    2.6.36-rc1 is available here:

    git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 2.6.36-rc1-pvhvm-pirq-v3

    Cheers,

    Stefano Stabellini


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