Re: [PATCH v12 66/84] KVM: LoongArch: Mark "struct page" pfn accessed before dropping mmu_lock

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On 2024/7/27 上午7:52, Sean Christopherson wrote:
Mark pages accessed before dropping mmu_lock when faulting in guest memory
so that LoongArch can convert to kvm_release_faultin_page() without
tripping its lockdep assertion on mmu_lock being held.

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
  arch/loongarch/kvm/mmu.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/kvm/mmu.c b/arch/loongarch/kvm/mmu.c
index 52b5c16cf250..230cafa178d7 100644
--- a/arch/loongarch/kvm/mmu.c
+++ b/arch/loongarch/kvm/mmu.cBibo Mao <maobibo@xxxxxxxxxxx>
@@ -902,13 +902,13 @@ static int kvm_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, bool write)
if (writeable)
  		kvm_set_pfn_dirty(pfn);
+	kvm_release_pfn_clean(pfn);
spin_unlock(&kvm->mmu_lock); if (prot_bits & _PAGE_DIRTY)
  		mark_page_dirty_in_slot(kvm, memslot, gfn);
- kvm_release_pfn_clean(pfn);
  out:
  	srcu_read_unlock(&kvm->srcu, srcu_idx);
  	return err;

Reviewed-by: Bibo Mao <maobibo@xxxxxxxxxxx>





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