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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