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Subject[PATCHv3 00/14] x86/tdx: Add kexec support
Date
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.

v3:
- Rework acpi_mp_crash_stop_other_cpus() to avoid invoking hotplug state
machine;
- Free page tables if reset vector setup failed;
- Change asm_acpi_mp_play_dead() to pass reset vector and PGD as arguments;
- Mark acpi_mp_* variables as static and __ro_after_init;
- Use u32 for apicid;
- Disable CPU offlining if reset vector setup failed;
- Rename madt.S -> madt_playdead.S;
- Mark tdx_kexec_unshare_mem() as static;
- Rebase onto up-to-date tip/master;
- Whitespace fixes;
- Reorder patches;
- Add Reviewed-bys;
- Update comments and commit messages;
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 (14):
x86/acpi: Extract ACPI MADT wakeup code into a separate file
x86/apic: Mark acpi_mp_wake_* variables as __ro_after_init
cpu/hotplug: 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: Rename fields in acpi_madt_multiproc_wakeup structure
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 | 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_playdead.S | 21 ++
arch/x86/kernel/acpi/madt_wakeup.c | 400 +++++++++++++++++++++++++++
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, 716 insertions(+), 144 deletions(-)
create mode 100644 arch/x86/coco/tdx/kexec.c
create mode 100644 arch/x86/kernel/acpi/madt_playdead.S
create mode 100644 arch/x86/kernel/acpi/madt_wakeup.c

--
2.41.0

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