arch/arm64/include/asm/kvm_pgtable.h
Source file repositories/reference/linux-study-clean/arch/arm64/include/asm/kvm_pgtable.h
File Facts
- System
- Linux kernel
- Corpus path
arch/arm64/include/asm/kvm_pgtable.h- Extension
.h- Size
- 31439 bytes
- Lines
- 904
- Domain
- Architecture Layer
- Bucket
- arch/arm64
- Inferred role
- Architecture Layer: implementation source
- Status
- source implementation candidate
Why This File Exists
CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/bits.hlinux/kvm_host.hlinux/types.h
Detected Declarations
struct kvm_pgtable_mm_opsstruct kvm_pgtable_visit_ctxstruct kvm_pgtable_walkerstruct kvm_pgtableenum kvm_invalid_pte_typeenum kvm_pgtable_stage2_flagsenum kvm_pgtable_protenum kvm_pgtable_walk_flagsfunction Copyrightfunction kvm_get_parangefunction kvm_pte_validfunction kvm_pte_to_physfunction kvm_phys_to_ptefunction kvm_pte_to_pfnfunction kvm_granule_shiftfunction kvm_granule_sizefunction kvm_level_supports_block_mappingfunction kvm_supported_block_sizesfunction kvm_is_block_size_supportedfunction kvm_pgtable_walk_sharedfunction kvm_pgtable_walk_beginfunction kvm_pgtable_walk_endfunction kvm_pgtable_walk_beginfunction kvm_pgtable_walk_endfunction kvm_pgtable_walk_lock_heldfunction kvm_pgtable_stage2_init
Annotated Snippet
struct kvm_pgtable_mm_ops {
void* (*zalloc_page)(void *arg);
void* (*zalloc_pages_exact)(size_t size);
void (*free_pages_exact)(void *addr, size_t size);
void (*free_unlinked_table)(void *addr, s8 level);
void (*get_page)(void *addr);
void (*put_page)(void *addr);
int (*page_count)(void *addr);
void* (*phys_to_virt)(phys_addr_t phys);
phys_addr_t (*virt_to_phys)(void *addr);
void (*dcache_clean_inval_poc)(void *addr, size_t size);
void (*icache_inval_pou)(void *addr, size_t size);
};
/**
* enum kvm_pgtable_stage2_flags - Stage-2 page-table flags.
* @KVM_PGTABLE_S2_IDMAP: Only use identity mappings.
* @KVM_PGTABLE_S2_AS_S1: Final memory attributes are that of Stage-1.
*/
enum kvm_pgtable_stage2_flags {
KVM_PGTABLE_S2_IDMAP = BIT(0),
KVM_PGTABLE_S2_AS_S1 = BIT(1),
};
/**
* enum kvm_pgtable_prot - Page-table permissions and attributes.
* @KVM_PGTABLE_PROT_UX: Unprivileged execute permission.
* @KVM_PGTABLE_PROT_PX: Privileged execute permission.
* @KVM_PGTABLE_PROT_X: Privileged and unprivileged execute permission.
* @KVM_PGTABLE_PROT_W: Write permission.
* @KVM_PGTABLE_PROT_R: Read permission.
* @KVM_PGTABLE_PROT_DEVICE: Device attributes.
* @KVM_PGTABLE_PROT_NORMAL_NC: Normal noncacheable attributes.
* @KVM_PGTABLE_PROT_SW0: Software bit 0.
* @KVM_PGTABLE_PROT_SW1: Software bit 1.
* @KVM_PGTABLE_PROT_SW2: Software bit 2.
* @KVM_PGTABLE_PROT_SW3: Software bit 3.
*/
enum kvm_pgtable_prot {
KVM_PGTABLE_PROT_PX = BIT(0),
KVM_PGTABLE_PROT_UX = BIT(1),
KVM_PGTABLE_PROT_X = KVM_PGTABLE_PROT_PX |
KVM_PGTABLE_PROT_UX,
KVM_PGTABLE_PROT_W = BIT(2),
KVM_PGTABLE_PROT_R = BIT(3),
KVM_PGTABLE_PROT_DEVICE = BIT(4),
KVM_PGTABLE_PROT_NORMAL_NC = BIT(5),
KVM_PGTABLE_PROT_SW0 = BIT(55),
KVM_PGTABLE_PROT_SW1 = BIT(56),
KVM_PGTABLE_PROT_SW2 = BIT(57),
KVM_PGTABLE_PROT_SW3 = BIT(58),
};
#define KVM_PGTABLE_PROT_RW (KVM_PGTABLE_PROT_R | KVM_PGTABLE_PROT_W)
#define KVM_PGTABLE_PROT_RWX (KVM_PGTABLE_PROT_RW | KVM_PGTABLE_PROT_X)
#define PKVM_HOST_MEM_PROT KVM_PGTABLE_PROT_RWX
#define PKVM_HOST_MMIO_PROT KVM_PGTABLE_PROT_RW
#define PAGE_HYP KVM_PGTABLE_PROT_RW
#define PAGE_HYP_EXEC (KVM_PGTABLE_PROT_R | KVM_PGTABLE_PROT_X)
#define PAGE_HYP_RO (KVM_PGTABLE_PROT_R)
#define PAGE_HYP_DEVICE (PAGE_HYP | KVM_PGTABLE_PROT_DEVICE)
typedef bool (*kvm_pgtable_force_pte_cb_t)(u64 addr, u64 end,
enum kvm_pgtable_prot prot);
/**
* enum kvm_pgtable_walk_flags - Flags to control a depth-first page-table walk.
* @KVM_PGTABLE_WALK_LEAF: Visit leaf entries, including invalid
* entries.
* @KVM_PGTABLE_WALK_TABLE_PRE: Visit table entries before their
* children.
* @KVM_PGTABLE_WALK_TABLE_POST: Visit table entries after their
* children.
* @KVM_PGTABLE_WALK_SHARED: Indicates the page-tables may be shared
* with other software walkers.
* @KVM_PGTABLE_WALK_IGNORE_EAGAIN: Don't terminate the walk early if
* the walker returns -EAGAIN.
* @KVM_PGTABLE_WALK_SKIP_BBM_TLBI: Visit and update table entries
* without Break-before-make's
* TLB invalidation.
* @KVM_PGTABLE_WALK_SKIP_CMO: Visit and update table entries
* without Cache maintenance
* operations required.
*/
enum kvm_pgtable_walk_flags {
KVM_PGTABLE_WALK_LEAF = BIT(0),
Annotation
- Immediate include surface: `linux/bits.h`, `linux/kvm_host.h`, `linux/types.h`.
- Detected declarations: `struct kvm_pgtable_mm_ops`, `struct kvm_pgtable_visit_ctx`, `struct kvm_pgtable_walker`, `struct kvm_pgtable`, `enum kvm_invalid_pte_type`, `enum kvm_pgtable_stage2_flags`, `enum kvm_pgtable_prot`, `enum kvm_pgtable_walk_flags`, `function Copyright`, `function kvm_get_parange`.
- Atlas domain: Architecture Layer / arch/arm64.
- Implementation status: source implementation candidate.
- Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.