Hi Will,
On 10/27/20 1:44 AM, Will Deacon wrote:
For consistency with the rest of the stage-2 page-table page allocations
(performing using a kvm_mmu_memory_cache), ensure that __GFP_ACCOUNT is
included in the GFP flags for the PGD pages.
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Quentin Perret <qperret@xxxxxxxxxx>
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
---
arch/arm64/kvm/hyp/pgtable.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
The patch itself looks good to me:
Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>
Another question is why the page-table pages for hyp mode aren't
allocated with __GFP_ACCOUNT in kvm_pgtable_hyp_init and hyp_map_walker()?
The page-table pages for host or guest are allocated with GFP_PGTABLE_USER
in alloc_pte_one().
#define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO)
Cheers,
Gavin
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 0cdf6e461cbd..95141b0d6088 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -846,7 +846,7 @@ int kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm *kvm)
u32 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
pgd_sz = kvm_pgd_pages(ia_bits, start_level) * PAGE_SIZE;
- pgt->pgd = alloc_pages_exact(pgd_sz, GFP_KERNEL | __GFP_ZERO);
+ pgt->pgd = alloc_pages_exact(pgd_sz, GFP_KERNEL_ACCOUNT | __GFP_ZERO);
if (!pgt->pgd)
return -ENOMEM;
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