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Subject[PATCH 0/2] x86/microcode: support for microcode update in Xen dom0
From: Jeremy Fitzhardinge <>

Hi all,

I'm proposing this for 2.6.39.

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 (1):
xen: add CPU microcode update driver

Stephen Tweedie (1):
xen dom0: Add support for the platform_ops hypercall

arch/x86/include/asm/microcode.h | 9 ++
arch/x86/include/asm/xen/hypercall.h | 8 ++
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 | 222 ++++++++++++++++++++++++++++++++++
include/xen/interface/xen.h | 2 +
8 files changed, 448 insertions(+), 1 deletions(-)
create mode 100644 arch/x86/kernel/microcode_xen.c
create mode 100644 include/xen/interface/platform.h


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