Thread (97 messages) 97 messages, 6 authors, 2021-02-22

Re: [RFC PATCH v2 24/26] KVM: arm64: Make memcache anonymous in pgtable allocator

From: Will Deacon <will@kernel.org>
Date: 2021-02-03 16:01:20
Also in: kvmarm, linux-devicetree, lkml

On Fri, Jan 08, 2021 at 12:15:22PM +0000, Quentin Perret wrote:
quoted hunk ↗ jump to hunk
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 to
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 <redacted>
---
 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 8e8f1d2c5e0e..d846bc3d3b77 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -176,8 +176,8 @@ 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 memory from which to allocate page-table
+ *		pages.
We should probably mention that this memory must be zeroed, since I don't
think the page-table code takes care of that.

Will

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