return level >= KVM_PGTABLE_MIN_BLOCK_LEVEL;
}
+static inline u32 kvm_supported_block_sizes(void)
+{
+ u32 level = KVM_PGTABLE_MIN_BLOCK_LEVEL;
+ u32 r = 0;
+
+ for (; level < KVM_PGTABLE_MAX_LEVELS; level++)
+ r |= BIT(kvm_granule_shift(level));
+
+ return r;
+}
+
+static inline bool kvm_is_block_size_supported(u64 size)
+{
+ bool is_power_of_two = IS_ALIGNED(size, size);
+
+ return is_power_of_two && (size & kvm_supported_block_sizes());
+}
+
/**
* struct kvm_pgtable_mm_ops - Memory management callbacks.
* @zalloc_page: Allocate a single zeroed memory page.
* allocation is physically contiguous.
* @free_pages_exact: Free an exact number of memory pages previously
* allocated by zalloc_pages_exact.
- * @free_removed_table: Free a removed paging structure by unlinking and
+ * @free_unlinked_table: Free an unlinked paging structure by unlinking and
* dropping references.
* @get_page: Increment the refcount on a page.
* @put_page: Decrement the refcount on a page. When the
void* (*zalloc_page)(void *arg);
void* (*zalloc_pages_exact)(size_t size);
void (*free_pages_exact)(void *addr, size_t size);
- void (*free_removed_table)(void *addr, u32 level);
+ void (*free_unlinked_table)(void *addr, u32 level);
void (*get_page)(void *addr);
void (*put_page)(void *addr);
int (*page_count)(void *addr);
* with other software walkers.
* @KVM_PGTABLE_WALK_HANDLE_FAULT: Indicates the page-table walk was
* invoked from a fault handler.
+ * @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),
KVM_PGTABLE_WALK_TABLE_POST = BIT(2),
KVM_PGTABLE_WALK_SHARED = BIT(3),
KVM_PGTABLE_WALK_HANDLE_FAULT = BIT(4),
+ KVM_PGTABLE_WALK_SKIP_BBM_TLBI = BIT(5),
+ KVM_PGTABLE_WALK_SKIP_CMO = BIT(6),
};
struct kvm_pgtable_visit_ctx {
void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt);
/**
- * kvm_pgtable_stage2_free_removed() - Free a removed stage-2 paging structure.
+ * kvm_pgtable_stage2_free_unlinked() - Free an unlinked stage-2 paging structure.
* @mm_ops: Memory management callbacks.
* @pgtable: Unlinked stage-2 paging structure to be freed.
* @level: Level of the stage-2 paging structure to be freed.
* The page-table is assumed to be unreachable by any hardware walkers prior to
* freeing and therefore no TLB invalidation is performed.
*/
-void kvm_pgtable_stage2_free_removed(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, u32 level);
+void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, u32 level);
+
+/**
+ * kvm_pgtable_stage2_create_unlinked() - Create an unlinked stage-2 paging structure.
+ * @pgt: Page-table structure initialised by kvm_pgtable_stage2_init*().
+ * @phys: Physical address of the memory to map.
+ * @level: Starting level of the stage-2 paging structure to be created.
+ * @prot: Permissions and attributes for the mapping.
+ * @mc: Cache of pre-allocated and zeroed memory from which to allocate
+ * page-table pages.
+ * @force_pte: Force mappings to PAGE_SIZE granularity.
+ *
+ * Returns an unlinked page-table tree. This new page-table tree is
+ * not reachable (i.e., it is unlinked) from the root pgd and it's
+ * therefore unreachableby the hardware page-table walker. No TLB
+ * invalidation or CMOs are performed.
+ *
+ * If device attributes are not explicitly requested in @prot, then the
+ * mapping will be normal, cacheable.
+ *
+ * Return: The fully populated (unlinked) stage-2 paging structure, or
+ * an ERR_PTR(error) on failure.
+ */
+kvm_pte_t *kvm_pgtable_stage2_create_unlinked(struct kvm_pgtable *pgt,
+ u64 phys, u32 level,
+ enum kvm_pgtable_prot prot,
+ void *mc, bool force_pte);
/**
* kvm_pgtable_stage2_map() - Install a mapping in a guest stage-2 page-table.
int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size);
/**
+ * kvm_pgtable_stage2_split() - Split a range of huge pages into leaf PTEs pointing
+ * to PAGE_SIZE guest pages.
+ * @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
+ * @addr: Intermediate physical address from which to split.
+ * @size: Size of the range.
+ * @mc: Cache of pre-allocated and zeroed memory from which to allocate
+ * page-table pages.
+ *
+ * The function tries to split any level 1 or 2 entry that overlaps
+ * with the input range (given by @addr and @size).
+ *
+ * Return: 0 on success, negative error code on failure. Note that
+ * kvm_pgtable_stage2_split() is best effort: it tries to break as many
+ * blocks in the input range as allowed by @mc_capacity.
+ */
+int kvm_pgtable_stage2_split(struct kvm_pgtable *pgt, u64 addr, u64 size,
+ struct kvm_mmu_memory_cache *mc);
+
+/**
* kvm_pgtable_walk() - Walk a page-table.
* @pgt: Page-table structure initialised by kvm_pgtable_*_init().
* @addr: Input address for the start of the walk.
projects / platform / kernel / linux-starfive.git / blobdiff