2021-03-04 06:32:36

by Quentin Perret

Subject: [PATCH v3 23/32] KVM: arm64: Make memcache anonymous in pgtable allocator

The current stage2 page-table allocator uses a memcache to get
pre-allocated pages when it needs any. To allow re-using this code at
EL2 which uses a concept of memory pools, make the memcache argument of
kvm_pgtable_stage2_map() anonymous, and let the mm_ops zalloc_page()
callbacks use it the way they need to.

Signed-off-by: Quentin Perret <[email protected]>
---
arch/arm64/include/asm/kvm_pgtable.h | 6 +++---
arch/arm64/kvm/hyp/pgtable.c | 4 ++--
2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index 21e0985d2e00..9935dbae2cc1 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -213,8 +213,8 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt);
* @size: Size of the mapping.
* @phys: Physical address of the memory to map.
* @prot: Permissions and attributes for the mapping.
- * @mc: Cache of pre-allocated GFP_PGTABLE_USER memory from which to
- * allocate page-table pages.
+ * @mc: Cache of pre-allocated and zeroed memory from which to allocate
+ * page-table pages.
*
* The offset of @addr within a page is ignored, @size is rounded-up to
* the next page boundary and @phys is rounded-down to the previous page
@@ -236,7 +236,7 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt);
*/
int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
u64 phys, enum kvm_pgtable_prot prot,
- struct kvm_mmu_memory_cache *mc);
+ void *mc);

/**
* kvm_pgtable_stage2_unmap() - Remove a mapping from a guest stage-2 page-table.
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 296675e5600d..bdd6e3d4eeb6 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -445,7 +445,7 @@ struct stage2_map_data {
kvm_pte_t *anchor;

struct kvm_s2_mmu *mmu;
- struct kvm_mmu_memory_cache *memcache;
+ void *memcache;

struct kvm_pgtable_mm_ops *mm_ops;
};
@@ -669,7 +669,7 @@ static int stage2_map_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,

int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
u64 phys, enum kvm_pgtable_prot prot,
- struct kvm_mmu_memory_cache *mc)
+ void *mc)
{
int ret;
struct stage2_map_data map_data = {
--
2.30.1.766.gb4fecdf3b7-goog

2021-03-04 19:47:05

by Will Deacon

Subject: Re: [PATCH v3 23/32] KVM: arm64: Make memcache anonymous in pgtable allocator

On Tue, Mar 02, 2021 at 02:59:53PM +0000, Quentin Perret wrote:
> The current stage2 page-table allocator uses a memcache to get
> pre-allocated pages when it needs any. To allow re-using this code at
> EL2 which uses a concept of memory pools, make the memcache argument of
> kvm_pgtable_stage2_map() anonymous, and let the mm_ops zalloc_page()
> callbacks use it the way they need to.
>
> Signed-off-by: Quentin Perret <[email protected]>
> ---
> arch/arm64/include/asm/kvm_pgtable.h | 6 +++---
> arch/arm64/kvm/hyp/pgtable.c | 4 ++--
> 2 files changed, 5 insertions(+), 5 deletions(-)

Acked-by: Will Deacon <[email protected]>

Will