Messages in this thread Patch in this message | | | From | Wanpeng Li <> | Subject | [PATCH] KVM: SEV: Add lock subtyping in sev_lock_two_vms so lockdep doesn't report false dependencies | Date | Tue, 4 Jan 2022 22:41:03 -0800 |
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From: Wanpeng Li <wanpengli@tencent.com>
Both source and dest vms' kvm->locks are held in sev_lock_two_vms, we should mark one with different subtype to avoid false positives from lockdep.
Fixes: c9d61dcb0bc26 (KVM: SEV: accept signals in sev_lock_two_vms) Reported-by: Yiru Xu <xyru1999@gmail.com> Tested-by: Jinrong Liang <cloudliang@tencent.com> Signed-off-by: Wanpeng Li <wanpengli@tencent.com> --- arch/x86/kvm/svm/sev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 7656a2c..be28831 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -1565,7 +1565,7 @@ static int sev_lock_two_vms(struct kvm *dst_kvm, struct kvm *src_kvm) r = -EINTR; if (mutex_lock_killable(&dst_kvm->lock)) goto release_src; - if (mutex_lock_killable(&src_kvm->lock)) + if (mutex_lock_killable_nested(&src_kvm->lock, SINGLE_DEPTH_NESTING)) goto unlock_dst; return 0; -- 2.7.4
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