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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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65a5d72785
kexec handover (KHO) creates a metadata that the kernels pass between each other during kexec. This metadata is stored in memory and kexec image contains a (physical) pointer to that memory. In addition, KHO keeps "scratch regions" available for kexec: physically contiguous memory regions that are guaranteed to not have any memory that KHO would preserve. The new kernel bootstraps itself using the scratch regions and sets all handed over memory as in use. When subsystems that support KHO initialize, they introspect the KHO metadata, restore preserved memory regions, and retrieve their state stored in the preserved memory. Enlighten x86 kexec-file and boot path about the KHO metadata and make sure it gets passed along to the next kernel. Link: https://lkml.kernel.org/r/20250509074635.3187114-12-changyuanl@google.com Signed-off-by: Alexander Graf <graf@amazon.com> Co-developed-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Co-developed-by: Changyuan Lyu <changyuanl@google.com> Signed-off-by: Changyuan Lyu <changyuanl@google.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Anthony Yznaga <anthony.yznaga@oracle.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Ashish Kalra <ashish.kalra@amd.com> Cc: Ben Herrenschmidt <benh@kernel.crashing.org> Cc: Borislav Betkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Eric Biederman <ebiederm@xmission.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Gowans <jgowans@amazon.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Krzysztof Kozlowski <krzk@kernel.org> Cc: Marc Rutland <mark.rutland@arm.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Pratyush Yadav <ptyadav@amazon.de> Cc: Rob Herring <robh@kernel.org> Cc: Saravana Kannan <saravanak@google.com> Cc: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleinxer <tglx@linutronix.de> Cc: Thomas Lendacky <thomas.lendacky@amd.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_ASM_X86_SETUP_DATA_H
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#define _UAPI_ASM_X86_SETUP_DATA_H
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/* setup_data/setup_indirect types */
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#define SETUP_NONE 0
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#define SETUP_E820_EXT 1
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#define SETUP_DTB 2
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#define SETUP_PCI 3
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#define SETUP_EFI 4
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#define SETUP_APPLE_PROPERTIES 5
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#define SETUP_JAILHOUSE 6
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#define SETUP_CC_BLOB 7
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#define SETUP_IMA 8
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#define SETUP_RNG_SEED 9
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#define SETUP_KEXEC_KHO 10
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#define SETUP_ENUM_MAX SETUP_KEXEC_KHO
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#define SETUP_INDIRECT (1<<31)
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#define SETUP_TYPE_MAX (SETUP_ENUM_MAX | SETUP_INDIRECT)
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#ifndef __ASSEMBLER__
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#include <linux/types.h>
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/* extensible setup data list node */
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struct setup_data {
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__u64 next;
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__u32 type;
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__u32 len;
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__u8 data[];
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};
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/* extensible setup indirect data node */
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struct setup_indirect {
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__u32 type;
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__u32 reserved; /* Reserved, must be set to zero. */
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__u64 len;
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__u64 addr;
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};
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/*
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* The E820 memory region entry of the boot protocol ABI:
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*/
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struct boot_e820_entry {
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__u64 addr;
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__u64 size;
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__u32 type;
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} __attribute__((packed));
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/*
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* The boot loader is passing platform information via this Jailhouse-specific
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* setup data structure.
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*/
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struct jailhouse_setup_data {
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struct {
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__u16 version;
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__u16 compatible_version;
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} __attribute__((packed)) hdr;
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struct {
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__u16 pm_timer_address;
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__u16 num_cpus;
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__u64 pci_mmconfig_base;
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__u32 tsc_khz;
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__u32 apic_khz;
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__u8 standard_ioapic;
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__u8 cpu_ids[255];
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} __attribute__((packed)) v1;
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struct {
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__u32 flags;
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} __attribute__((packed)) v2;
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} __attribute__((packed));
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/*
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* IMA buffer setup data information from the previous kernel during kexec
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*/
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struct ima_setup_data {
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__u64 addr;
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__u64 size;
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} __attribute__((packed));
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/*
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* Locations of kexec handover metadata
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*/
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struct kho_data {
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__u64 fdt_addr;
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__u64 fdt_size;
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__u64 scratch_addr;
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__u64 scratch_size;
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} __attribute__((packed));
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#endif /* __ASSEMBLER__ */
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#endif /* _UAPI_ASM_X86_SETUP_DATA_H */
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