The patchset adds bits and pieces to get kexec (and crashkernel) work on TDX guest. The last patch implements CPU offlining according to the approved ACPI spec change poposal[1]. It unlocks kexec with all CPUs visible in the target kernel. It requires BIOS-side enabling. If it missing we fallback to booting 2nd kernel with single CPU. Please review. I would be glad for any feedback. v2: - Rework how unsharing hook ups into kexec codepath; - Rework kvmclock_disable() fix based on Sean's; - s/cpu_hotplug_not_supported()/cpu_hotplug_disable_offlining()/; - use play_dead_common() to implement acpi_mp_play_dead(); - cond_resched() in tdx_shared_memory_show(); - s/target kernel/second kernel/; - Update commit messages and comments; [1] https://lore.kernel.org/all/13356251.uLZWGnKmhe@kreacher Kirill A. Shutemov (13): x86/acpi: Extract ACPI MADT wakeup code into a separate file kernel/cpu: Add support for declaring CPU offlining not supported cpu/hotplug, x86/acpi: Disable CPU offlining for ACPI MADT wakeup x86/kvm: Do not try to disable kvmclock if it was not enabled x86/kexec: Keep CR4.MCE set during kexec for TDX guest x86/mm: Make x86_platform.guest.enc_status_change_*() return errno x86/mm: Return correct level from lookup_address() if pte is none x86/tdx: Account shared memory x86/tdx: Convert shared memory back to private on kexec x86/mm: Make e820_end_ram_pfn() cover E820_TYPE_ACPI ranges x86/acpi: Do not attempt to bring up secondary CPUs in kexec case x86/acpi: Rename fields in acpi_madt_multiproc_wakeup structure x86/acpi: Add support for CPU offlining for ACPI MADT wakeup method arch/x86/Kconfig | 7 + arch/x86/coco/core.c | 1 - arch/x86/coco/tdx/kexec.c | 0 arch/x86/coco/tdx/tdx.c | 205 +++++++++++++++++++- arch/x86/hyperv/ivm.c | 9 +- arch/x86/include/asm/acpi.h | 5 + arch/x86/include/asm/pgtable_types.h | 1 + arch/x86/include/asm/x86_init.h | 5 +- arch/x86/kernel/acpi/Makefile | 11 +- arch/x86/kernel/acpi/boot.c | 88 +-------- arch/x86/kernel/acpi/madt.S | 24 +++ arch/x86/kernel/acpi/madt_wakeup.c | 267 +++++++++++++++++++++++++++ arch/x86/kernel/crash.c | 4 + arch/x86/kernel/e820.c | 9 +- arch/x86/kernel/kvmclock.c | 12 +- arch/x86/kernel/reboot.c | 5 + arch/x86/kernel/relocate_kernel_64.S | 5 + arch/x86/kernel/x86_init.c | 4 +- arch/x86/mm/mem_encrypt_amd.c | 8 +- arch/x86/mm/pat/set_memory.c | 17 +- include/acpi/actbl2.h | 19 +- include/linux/cc_platform.h | 10 - include/linux/cpu.h | 2 + kernel/cpu.c | 12 +- 24 files changed, 586 insertions(+), 144 deletions(-) create mode 100644 arch/x86/coco/tdx/kexec.c create mode 100644 arch/x86/kernel/acpi/madt.S create mode 100644 arch/x86/kernel/acpi/madt_wakeup.c -- 2.41.0 _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
