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    Subject[PATCH v2] ACPI S3 to work under Xen.
    Date
    Attached is an [v2] set of patches to enable S3 to work with the Xen hypervisor.

    Changes since the RFC posting [http://comments.gmane.org/gmane.linux.acpi.devel/50701] by
    Liang Tang:
    - Per review comments added: __unused__ attribute, support for PM1A/B if more than 16-bit,
    copyright/license.
    - Added support for PHYSDEVOP_restore_msi_ext call.

    The relationship that Xen has with Linux kernel is symbiotic. The Linux
    kernel does the ACPI "stuff" and tells the hypervisor to do the low-level
    stuff (such as program the IOAPIC, setup vectors, etc). The realm of
    ACPI S3 is more complex as we need to save the CPU state (and Intel TXT
    values - which the hypervisor has to do).

    The major difficulties we hit was with 'acpi_suspend_lowlevel' - which tweaks
    a lot of lowlevel values and some of them are not properly handled by Xen.
    Liang Tang has figured which ones of them we trip over (read below) - and he
    suggested that perhaps we can provide a registration mechanism to abstract
    this away. The reason for all of this is that Linux does not talk to the
    BIOS directly - instead it simply walks through the necessary ACPI methods
    and then issues hypercall to Xen which then further completes the remaining
    suspend steps.

    So the attached patches do exactly that - there are two entry points
    in the ACPI.

    1). For S3: acpi_suspend_lowlevel -> .. lots of code -> acpi_enter_sleep_state
    2). For S1/S4/S5: acpi_enter_sleep_state

    The first naive idea was of abstracting away in the 'acpi_enter_sleep_state'
    function the tboot_sleep code so that we can use it too. And low-behold - it
    worked splendidly for powering off (S5 I believe)

    For S3 that did not work - during suspend the hypervisor tripped over when
    saving cr8. During resume it tripped over at restoring the cr3, cr8, idt,
    and gdt values.

    When I posted the RFC, the feedback I got was to use a higher upper interface
    to make the call to the hypervisor. Instead of doing it at the lower pv-ops
    case for cr3, cr8, idt, gdt, etc. The code I've to say - is much nicer than
    doing it via pv-ops.

    Anyhow, please take a look!

    Konrad Rzeszutek Wilk (5):
    x86: Expand the x86_msi_ops to have a restore MSIs.
    x86, acpi, tboot: Have a ACPI sleep override instead of calling tboot_sleep.
    xen: Utilize the restore_msi_irqs hook.
    xen/acpi/sleep: Enable ACPI sleep via the __acpi_override_sleep
    xen/acpi/sleep: Register to the acpi_suspend_lowlevel a callback.

    Liang Tang (2):
    x86/acpi/sleep: Provide registration for acpi_suspend_lowlevel.
    xen/pci:use hypercall PHYSDEVOP_restore_msi_ext to restore MSI/MSI-X vectors

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


    arch/ia64/include/asm/xen/interface.h | 1 +
    arch/x86/include/asm/acpi.h | 6 +-
    arch/x86/include/asm/pci.h | 9 +
    arch/x86/include/asm/x86_init.h | 1 +
    arch/x86/include/asm/xen/hypercall.h | 8 +
    arch/x86/include/asm/xen/interface.h | 1 +
    arch/x86/kernel/acpi/boot.c | 6 +
    arch/x86/kernel/acpi/sleep.c | 4 +-
    arch/x86/kernel/acpi/sleep.h | 2 +
    arch/x86/kernel/tboot.c | 14 +-
    arch/x86/kernel/x86_init.c | 1 +
    arch/x86/pci/xen.c | 29 +++
    arch/x86/xen/enlighten.c | 3 +
    drivers/acpi/acpica/hwsleep.c | 12 +-
    drivers/acpi/sleep.c | 2 +
    drivers/pci/msi.c | 29 +++-
    drivers/xen/Makefile | 2 +-
    drivers/xen/acpi.c | 65 +++++++
    include/linux/tboot.h | 3 +-
    include/xen/acpi.h | 70 +++++++
    include/xen/interface/physdev.h | 15 ++
    include/xen/interface/platform.h | 320 +++++++++++++++++++++++++++++++++
    include/xen/interface/xen.h | 1 +
    23 files changed, 591 insertions(+), 13 deletions(-)



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