* Juergen Gross [off-list ref] wrote:

In the non-EFI boot path the ACPI RSDP table is currently found via
either EBDA or by searching through low memory for the RSDP magic.
This requires the RSDP to be located in the first 1MB of physical
memory. Xen PVH guests, however, get the RSDP address via the start of
day information block.

In order to support an arbitrary RSDP address this patch series adds
the physical address of the RSDP to the boot params structure filled
by the boot loader.

Juergen Gross (3):
  x86/xen: fix boot loader version reported for pvh guests
  x86/boot: add acpi rsdp address to setup_header
  x86/acpi: take rsdp address for boot params if available

 Documentation/x86/boot.txt            | 32 +++++++++++++++++++++++++++++++-
 arch/x86/boot/header.S                |  6 +++++-
 arch/x86/include/asm/acpi.h           |  7 +++++++
 arch/x86/include/asm/x86_init.h       |  2 ++
 arch/x86/include/uapi/asm/bootparam.h |  4 ++++
 arch/x86/kernel/acpi/boot.c           |  6 ++++++
 arch/x86/kernel/head32.c              |  1 +
 arch/x86/kernel/head64.c              |  2 ++
 arch/x86/kernel/setup.c               | 17 +++++++++++++++++
 arch/x86/kernel/x86_init.c            |  3 +--
 arch/x86/xen/enlighten_pvh.c          |  2 +-
 11 files changed, 77 insertions(+), 5 deletions(-)

I have some vague memories of an older variant of this feature breaking stuff and resulting in 
me involuntarily participating in an overly long bisection session.

If that memory is right and I'm not confusing it with some other patchset, could you please 
provide some more context, what that old problem was, how it was resolved, whether it is 
expected to trigger on any machines, etc., to create some warm fuzzy feelings about this 
patch-set and to reduce my bisectofobia? ;-)

Thanks,

	Ingo