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(-) -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
