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    Subject[PATCH 0/3] x86/microcode: support for microcode update in Xen dom0
    From: Jeremy Fitzhardinge <>

    Hi all,

    I'm proposing this for the next merge window v3.2.

    I originally posted this early this year, and it prompted a debate
    about what the "proper" way that Linux should do microcode updates,
    with the general concensus being "earlier", ideally in the bootloader
    (or in the case of Xen, as the hypervisor boots before starting any
    domains). However, as far as I know there has been no progress along
    those lines.

    I would like to therefore merge this so that a Linux kernel booting as
    dom0 under Xen can update the microcode in the same manner as a kernel
    booting natively. When we work out how boot-time microcode updates
    can be done, then we'll look at modifying Xen accordingly. In the
    meantime, we should have a functional parity.

    The only change to this code from the previous posting is some patch
    restructuring so that regardless of how the platform.h ABI header gets
    merged (since there are some other pending branches containing it), it
    will be identical and cause no merge headaches.

    From original posting:

    This series adds a new "Xen" microcode update type, in addition to
    Intel and AMD.

    The Xen hypervisor is responsible for performing the actual microcode
    update (since only it knows what physical CPUs are in the system and
    has sufficient privilege to access them), but it requires the dom0
    kernel to provide the actual microcode update data.

    Xen update mechanism is uniform independent of the CPU type, but the
    driver must know where to find the data file, which depends on the CPU
    type. And since the update hypercall updates all CPUs, we only need
    to execute it once on any CPU - but for simplicity it just runs it only
    on (V)CPU 0.


    Jeremy Fitzhardinge (2):
    xen: add dom0_op hypercall
    xen: add CPU microcode update driver

    Yu Ke (1):
    xen/acpi: Domain0 acpi parser related platform hypercall

    arch/ia64/include/asm/xen/interface.h | 1 +
    arch/x86/include/asm/microcode.h | 9 +
    arch/x86/include/asm/xen/hypercall.h | 8 +
    arch/x86/include/asm/xen/interface.h | 1 +
    arch/x86/kernel/Makefile | 1 +
    arch/x86/kernel/microcode_core.c | 5 +-
    arch/x86/kernel/microcode_xen.c | 198 ++++++++++++++++++++
    arch/x86/xen/Kconfig | 4 +
    include/xen/interface/platform.h | 320 +++++++++++++++++++++++++++++++++
    include/xen/interface/xen.h | 1 +
    10 files changed, 547 insertions(+), 1 deletions(-)
    create mode 100644 arch/x86/kernel/microcode_xen.c
    create mode 100644 include/xen/interface/platform.h


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