linux-kernel - [PATCH] KVM: x86: move kvm_create_vcpu

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Message-Id: <20200331224222.393439-1-pbonzini@redhat.com>
Date:   Wed,  1 Apr 2020 00:42:22 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     eesposit@...hat.com
Subject: [PATCH] KVM: x86: move kvm_create_vcpu_debugfs after last failure point

The placement of kvm_create_vcpu_debugfs is more or less irrelevant, since
it cannot fail and userspace should not care about the debugfs entries until
it knows the vcpu has been created.  Moving it after the last failure
point removes the need to remove the directory when unwinding the creation.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 virt/kvm/kvm_main.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 027259af883e..0a78e1d874ed 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2823,8 +2823,6 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 	if (r)
 		goto vcpu_free_run_page;
 
-	kvm_create_vcpu_debugfs(vcpu);
-
 	mutex_lock(&kvm->lock);
 	if (kvm_get_vcpu_by_id(kvm, id)) {
 		r = -EEXIST;
@@ -2853,11 +2851,11 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 
 	mutex_unlock(&kvm->lock);
 	kvm_arch_vcpu_postcreate(vcpu);
+	kvm_create_vcpu_debugfs(vcpu);
 	return r;
 
 unlock_vcpu_destroy:
 	mutex_unlock(&kvm->lock);
-	debugfs_remove_recursive(vcpu->debugfs_dentry);
 	kvm_arch_vcpu_destroy(vcpu);
 vcpu_free_run_page:
 	free_page((unsigned long)vcpu->run);
-- 
2.24.1