The patchset adds bits and pieces to get kexec (and crashkernel) work on TDX guest. They bring kexec support to the point when we can start the new kernel, but it will only be able to use single CPU. It should be enough to cover the most common case: crashkernel. 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. Please review. I would be glad for any feedback. [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 hotplug not supported cpu/hotplug, x86/acpi: Disable CPU hotplug 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 KVM: x86: Add config option to gate emergency virt callback support 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: Add support for CPU offlining for ACPI MADT wakeup method arch/x86/Kconfig | 8 + arch/x86/coco/core.c | 1 - arch/x86/coco/tdx/kexec.c | 0 arch/x86/coco/tdx/tdx.c | 220 +++++++++++++++++++++- 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/reboot.h | 4 +- arch/x86/include/asm/x86_init.h | 4 +- arch/x86/kernel/acpi/Makefile | 11 +- arch/x86/kernel/acpi/boot.c | 88 +-------- arch/x86/kernel/acpi/madt.S | 28 +++ arch/x86/kernel/acpi/madt_wakeup.c | 262 +++++++++++++++++++++++++++ arch/x86/kernel/e820.c | 9 +- arch/x86/kernel/kvmclock.c | 9 +- arch/x86/kernel/reboot.c | 4 +- arch/x86/kernel/relocate_kernel_64.S | 5 + arch/x86/kernel/x86_init.c | 4 +- arch/x86/kvm/Kconfig | 5 + 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 | 17 +- 25 files changed, 604 insertions(+), 146 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
