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[184.144.111.238]) by smtp.gmail.com with ESMTPSA id b7sm2529301qti.21.2021.06.24.11.13.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Jun 2021 11:14:01 -0700 (PDT) From: Peter Xu To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Paolo Bonzini , Vitaly Kuznetsov , Maxim Levitsky , peterx@redhat.com, Sean Christopherson Subject: [PATCH 2/9] KVM: Introduce kvm_get_kvm_safe() Date: Thu, 24 Jun 2021 14:13:49 -0400 Message-Id: <20210624181356.10235-3-peterx@redhat.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210624181356.10235-1-peterx@redhat.com> References: <20210624181356.10235-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce this safe version of kvm_get_kvm() so that it can be called even during vm destruction. Use it in kvm_debugfs_open() and remove the verbose comment. Prepare to be used elsewhere. Signed-off-by: Peter Xu --- include/linux/kvm_host.h | 1 + virt/kvm/kvm_main.c | 17 +++++++++++------ 2 files changed, 12 insertions(+), 6 deletions(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 2f34487e21f2..53d7d09eebd7 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -698,6 +698,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, void kvm_exit(void); void kvm_get_kvm(struct kvm *kvm); +bool kvm_get_kvm_safe(struct kvm *kvm); void kvm_put_kvm(struct kvm *kvm); bool file_is_kvm(struct file *file); void kvm_put_kvm_no_destroy(struct kvm *kvm); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d170f65e15b0..0b4f55370b18 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1049,6 +1049,16 @@ void kvm_get_kvm(struct kvm *kvm) } EXPORT_SYMBOL_GPL(kvm_get_kvm); +/* + * Make sure the vm is not during destruction, which is a safe version of + * kvm_get_kvm(). Return true if kvm referenced successfully, false otherwise. + */ +bool kvm_get_kvm_safe(struct kvm *kvm) +{ + return refcount_inc_not_zero(&kvm->users_count); +} +EXPORT_SYMBOL_GPL(kvm_get_kvm_safe); + void kvm_put_kvm(struct kvm *kvm) { if (refcount_dec_and_test(&kvm->users_count)) @@ -4713,12 +4723,7 @@ static int kvm_debugfs_open(struct inode *inode, struct file *file, struct kvm_stat_data *stat_data = (struct kvm_stat_data *) inode->i_private; - /* The debugfs files are a reference to the kvm struct which - * is still valid when kvm_destroy_vm is called. - * To avoid the race between open and the removal of the debugfs - * directory we test against the users count. - */ - if (!refcount_inc_not_zero(&stat_data->kvm->users_count)) + if (!kvm_get_kvm_safe(stat_data->kvm)) return -ENOENT; if (simple_attr_open(inode, file, get, -- 2.31.1