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KVM: arm64: Rename free_removed to free_unlinked

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Normalize on referring to tables outside of an active paging structure
as 'unlinked'.

A subsequent change to KVM will add support for building page tables
that are not part of an active paging structure. The existing
'removed_table' terminology is quite clunky when applied in this
context.

Signed-off-by: Ricardo Koller <ricarkol@google.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Link: https://lore.kernel.org/r/20230426172330.1439644-2-ricarkol@google.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Ricardo Koller 2023-04-26 17:23:19 +00:00 committed by Oliver Upton
parent f1fcbaa18b
commit c14d08c5ad
4 changed files with 15 additions and 15 deletions
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8
arch/arm64/include/asm/kvm_pgtable.h
View File

@ -104,7 +104,7 @@ static inline bool kvm_level_supports_block_mapping(u32 level)
* 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
@ -124,7 +124,7 @@ 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_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);
@ -440,7 +440,7 @@ int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu,
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.
@ -448,7 +448,7 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt);
* 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_map() - Install a mapping in a guest stage-2 page-table.

6
arch/arm64/kvm/hyp/nvhe/mem_protect.c
View File

@ -91,9 +91,9 @@ static void host_s2_put_page(void *addr)
hyp_put_page(&host_s2_pool, addr);
}
static void host_s2_free_removed_table(void *addr, u32 level)
static void host_s2_free_unlinked_table(void *addr, u32 level)
{
kvm_pgtable_stage2_free_removed(&host_mmu.mm_ops, addr, level);
kvm_pgtable_stage2_free_unlinked(&host_mmu.mm_ops, addr, level);
}
static int prepare_s2_pool(void *pgt_pool_base)
@ -110,7 +110,7 @@ static int prepare_s2_pool(void *pgt_pool_base)
host_mmu.mm_ops = (struct kvm_pgtable_mm_ops) {
.zalloc_pages_exact = host_s2_zalloc_pages_exact,
.zalloc_page = host_s2_zalloc_page,
.free_removed_table = host_s2_free_removed_table,
.free_unlinked_table = host_s2_free_unlinked_table,
.phys_to_virt = hyp_phys_to_virt,
.virt_to_phys = hyp_virt_to_phys,
.page_count = hyp_page_count,

6
arch/arm64/kvm/hyp/pgtable.c
View File

@ -860,7 +860,7 @@ static int stage2_map_walk_table_pre(const struct kvm_pgtable_visit_ctx *ctx,
if (ret)
return ret;
mm_ops->free_removed_table(childp, ctx->level);
mm_ops->free_unlinked_table(childp, ctx->level);
return 0;
}
@ -905,7 +905,7 @@ static int stage2_map_walk_leaf(const struct kvm_pgtable_visit_ctx *ctx,
* The TABLE_PRE callback runs for table entries on the way down, looking
* for table entries which we could conceivably replace with a block entry
* for this mapping. If it finds one it replaces the entry and calls
* kvm_pgtable_mm_ops::free_removed_table() to tear down the detached table.
* kvm_pgtable_mm_ops::free_unlinked_table() to tear down the detached table.
*
* Otherwise, the LEAF callback performs the mapping at the existing leaves
* instead.
@ -1276,7 +1276,7 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt)
pgt->pgd = NULL;
}
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_pteref_t ptep = (kvm_pteref_t)pgtable;
struct kvm_pgtable_walker walker = {

10
arch/arm64/kvm/mmu.c
View File

@ -131,21 +131,21 @@ static void kvm_s2_free_pages_exact(void *virt, size_t size)
static struct kvm_pgtable_mm_ops kvm_s2_mm_ops;
static void stage2_free_removed_table_rcu_cb(struct rcu_head *head)
static void stage2_free_unlinked_table_rcu_cb(struct rcu_head *head)
{
struct page *page = container_of(head, struct page, rcu_head);
void *pgtable = page_to_virt(page);
u32 level = page_private(page);
kvm_pgtable_stage2_free_removed(&kvm_s2_mm_ops, pgtable, level);
kvm_pgtable_stage2_free_unlinked(&kvm_s2_mm_ops, pgtable, level);
}
static void stage2_free_removed_table(void *addr, u32 level)
static void stage2_free_unlinked_table(void *addr, u32 level)
{
struct page *page = virt_to_page(addr);
set_page_private(page, (unsigned long)level);
call_rcu(&page->rcu_head, stage2_free_removed_table_rcu_cb);
call_rcu(&page->rcu_head, stage2_free_unlinked_table_rcu_cb);
}
static void kvm_host_get_page(void *addr)
@ -701,7 +701,7 @@ static struct kvm_pgtable_mm_ops kvm_s2_mm_ops = {
.zalloc_page = stage2_memcache_zalloc_page,
.zalloc_pages_exact = kvm_s2_zalloc_pages_exact,
.free_pages_exact = kvm_s2_free_pages_exact,
.free_removed_table = stage2_free_removed_table,
.free_unlinked_table = stage2_free_unlinked_table,
.get_page = kvm_host_get_page,
.put_page = kvm_s2_put_page,
.page_count = kvm_host_page_count,