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Fri, 12 Dec 2025 07:05:50 -0800 (PST) X-Google-Smtp-Source: AGHT+IFINyFysyaG3Z7M7nKx2uV1+TcX6mLN4/JurQM2jroBzGQCP/c1s4YHv6IamP+nxOelN0SRRw== X-Received: by 2002:a17:903:2ecc:b0:295:592e:7633 with SMTP id d9443c01a7336-29f26eb34ddmr23525245ad.29.1765551950285; Fri, 12 Dec 2025 07:05:50 -0800 (PST) From: Ani Sinha To: Paolo Bonzini Cc: vkuznets@redhat.com, kraxel@redhat.com, qemu-devel@nongnu.org, Ani Sinha , kvm@vger.kernel.org Subject: [PATCH v1 26/28] kvm/vcpu: add notifiers to inform vcpu file descriptor change Date: Fri, 12 Dec 2025 20:33:54 +0530 Message-ID: <20251212150359.548787-27-anisinha@redhat.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20251212150359.548787-1-anisinha@redhat.com> References: <20251212150359.548787-1-anisinha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=anisinha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1765552074158158500 Content-Type: text/plain; charset="utf-8" When new vcpu file descriptors are created and bound to the new kvm file descriptor as a part of the confidential guest reset mechanism, various subsystems needs to know about it. This change adds notifiers so that vario= us subsystems can take appropriate actions when vcpu fds change by registering their handlers to this notifier. Subsequent changes will register specific handlers to this notifier. Signed-off-by: Ani Sinha --- accel/kvm/kvm-all.c | 27 ++++++++++++++++++++++++++- accel/stubs/kvm-stub.c | 10 ++++++++++ include/system/kvm.h | 17 +++++++++++++++++ 3 files changed, 53 insertions(+), 1 deletion(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 638f193626..7f9c0d454a 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -130,8 +130,10 @@ static NotifierWithReturnList register_vmfd_changed_no= tifiers =3D static NotifierWithReturnList register_vmfd_pre_change_notifiers =3D NOTIFIER_WITH_RETURN_LIST_INITIALIZER(register_vmfd_pre_change_notifie= rs); =20 -static int kvm_rebind_vcpus(Error **errp); +static NotifierWithReturnList register_vcpufd_changed_notifiers =3D + NOTIFIER_WITH_RETURN_LIST_INITIALIZER(register_vcpufd_changed_notifier= s); =20 +static int kvm_rebind_vcpus(Error **errp); static int map_kvm_run(KVMState *s, CPUState *cpu, Error **errp); static int map_kvm_dirty_gfns(KVMState *s, CPUState *cpu, Error **errp); static int vcpu_unmap_regions(KVMState *s, CPUState *cpu); @@ -2327,6 +2329,22 @@ void kvm_vmfd_remove_pre_change_notifier(NotifierWit= hReturn *n) notifier_with_return_remove(n); } =20 +void kvm_vcpufd_add_change_notifier(NotifierWithReturn *n) +{ + notifier_with_return_list_add(®ister_vcpufd_changed_notifiers, n); +} + +void kvm_vcpufd_remove_change_notifier(NotifierWithReturn *n) +{ + notifier_with_return_remove(n); +} + +static int kvm_vcpufd_change_notify(Error **errp) +{ + return notifier_with_return_list_notify(®ister_vcpufd_changed_notif= iers, + &vmfd_notifier, errp); +} + static int kvm_vmfd_pre_change_notify(Error **errp) { return notifier_with_return_list_notify(®ister_vmfd_pre_change_noti= fiers, @@ -2847,6 +2865,13 @@ static int kvm_reset_vmfd(MachineState *ms) } assert(!err); =20 + /* notify everyone that vcpu fd has changed. */ + ret =3D kvm_vcpufd_change_notify(&err); + if (ret < 0) { + return ret; + } + assert(!err); + /* these can be only called after ram_block_rebind() */ memory_listener_register(&kml->listener, &address_space_memory); memory_listener_register(&kvm_io_listener, &address_space_io); diff --git a/accel/stubs/kvm-stub.c b/accel/stubs/kvm-stub.c index 7f4e3c4050..5b94f3dc3c 100644 --- a/accel/stubs/kvm-stub.c +++ b/accel/stubs/kvm-stub.c @@ -95,6 +95,16 @@ void kvm_vmfd_remove_change_notifier(NotifierWithReturn = *n) { } =20 +void kvm_vcpufd_add_change_notifier(NotifierWithReturn *n) +{ + return; +} + +void kvm_vcpufd_remove_change_notifier(NotifierWithReturn *n) +{ + return; +} + int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n, EventNotifier *rn, int virq) { diff --git a/include/system/kvm.h b/include/system/kvm.h index cb5db9ff67..bfd09e70a0 100644 --- a/include/system/kvm.h +++ b/include/system/kvm.h @@ -586,6 +586,23 @@ void kvm_vmfd_add_change_notifier(NotifierWithReturn *= n); */ void kvm_vmfd_remove_change_notifier(NotifierWithReturn *n); =20 +/** + * kvm_vcpufd_add_change_notifier - register a notifier to get notified wh= en + * a KVM vcpu file descriptors changes as a part of the confidential guest + * "reset" process. Various subsystems should use this mechanism to take + * actions such as re-issuing vcpu ioctls as a part of setting up vcpu + * features. + * @n: notifier with return value. + */ +void kvm_vcpufd_add_change_notifier(NotifierWithReturn *n); + +/** + * kvm_vcpufd_remove_change_notifier - de-register a notifer previously + * registered with kvm_vcpufd_add_change_notifier call. + * @n: notifier that was previously registered. + */ +void kvm_vcpufd_remove_change_notifier(NotifierWithReturn *n); + /** * kvm_vmfd_add_pre_change_notifier - register a notifier to get notified = when * kvm vm file descriptor is about to be changed as a part of the confiden= tial --=20 2.42.0