Unverified Commit c8f45a0c authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!4261 [22.03-LTS-SP3] Fix crash on platfoms using legacy KVM MMU Notifier APIs 

Merge Pull Request from: @yuzhang_intel 
 
Title: Fix crash on platfoms using legacy KVM MMU Notifier APIs

Content:
This PR is to fix a bug in KVM MMU. The bug can cause a kernel panic, if the host is still using old KVM MMU notifier APIs (e.g., on LoongArch). 

Issue is reported by https://gitee.com/openeuler/kernel/issues/I8YDCS. 
 
Link:https://gitee.com/openeuler/kernel/pulls/4261

 

Reviewed-by: default avatarAichun Shi <aichun.shi@intel.com>
Reviewed-by: default avatarJason Zeng <jason.zeng@intel.com>
Signed-off-by: default avatarJialin Zhang <zhangjialin11@huawei.com>
parents 8d60eec4 348acf74

virt/kvm/kvm_main.c

+4 −1
Original line number Diff line number Diff line
@@ -662,6 +662,7 @@ static __always_inline int kvm_handle_hva_range_no_flush(struct mmu_notifier *mn 


	return __kvm_handle_hva_range(kvm, &range);

}

#endif /* KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS */



static void kvm_inc_notifier_count(struct kvm *kvm, unsigned long start,

				   unsigned long end)
@@ -691,7 +692,6 @@ static void kvm_inc_notifier_count(struct kvm *kvm, unsigned long start, 
			max(kvm->mmu_notifier_range_end, end);

	}

}

#endif /* KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS */



static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,

					struct mm_struct *mm,
@@ -748,6 +748,9 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, 
#else

	idx = srcu_read_lock(&kvm->srcu);

	KVM_MMU_LOCK(kvm);



	kvm_inc_notifier_count(kvm, range->start, range->end);



	need_tlb_flush = kvm_unmap_hva_range(kvm, range->start, range->end,

					     range->flags);

	/* we've to flush the tlb before the pages can be freed */