| From: |
| "Kirill A. Shutemov" <kirill.shutemov-AT-linux.intel.com> |
| To: |
| Thomas Gleixner <tglx-AT-linutronix.de>, Ingo Molnar <mingo-AT-redhat.com>, Borislav Petkov <bp-AT-alien8.de>, Dave Hansen <dave.hansen-AT-linux.intel.com>, x86-AT-kernel.org |
| Subject: |
| [PATCHv2 00/13] x86/tdx: Add kexec support |
| Date: |
| Fri, 20 Oct 2023 18:12:29 +0300 |
| Message-ID: |
| <20231020151242.1814-1-kirill.shutemov@linux.intel.com> |
| Cc: |
| "Rafael J. Wysocki" <rafael-AT-kernel.org>, Peter Zijlstra <peterz-AT-infradead.org>, Adrian Hunter <adrian.hunter-AT-intel.com>, Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy-AT-linux.intel.com>, Elena Reshetova <elena.reshetova-AT-intel.com>, Jun Nakajima <jun.nakajima-AT-intel.com>, Rick Edgecombe <rick.p.edgecombe-AT-intel.com>, Tom Lendacky <thomas.lendacky-AT-amd.com>, "Kalra, Ashish" <ashish.kalra-AT-amd.com>, Sean Christopherson <seanjc-AT-google.com>, "Huang, Kai" <kai.huang-AT-intel.com>, Baoquan He <bhe-AT-redhat.com>, kexec-AT-lists.infradead.org, linux-coco-AT-lists.linux.dev, linux-kernel-AT-vger.kernel.org, "Kirill A. Shutemov" <kirill.shutemov-AT-linux.intel.com> |
| Archive-link: |
| Article |
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
