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GET /api/patches/2195840/?format=api
{ "id": 2195840, "url": "http://patchwork.ozlabs.org/api/patches/2195840/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260212062522.99565-29-anisinha@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260212062522.99565-29-anisinha@redhat.com>", "list_archive_url": null, "date": "2026-02-12T06:25:12", "name": "[v4,28/31] kvm/vcpu: add notifiers to inform vcpu file descriptor change", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "dcd57c8b3af6cf4606f34e40c393b41624afd392", "submitter": { "id": 86030, "url": "http://patchwork.ozlabs.org/api/people/86030/?format=api", "name": "Ani Sinha", "email": "anisinha@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260212062522.99565-29-anisinha@redhat.com/mbox/", "series": [ { "id": 491935, "url": "http://patchwork.ozlabs.org/api/series/491935/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=491935", "date": "2026-02-12T06:24:45", "name": "Introduce support for confidential guest reset (x86)", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/491935/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2195840/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2195840/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=SCMLHjoy;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=Pep0k52v;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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This change adds notifiers so that various\nsubsystems can take appropriate actions when vcpu fds change by registering\ntheir handlers to this notifier.\nSubsequent changes will register specific handlers to this notifier.\n\nSigned-off-by: Ani Sinha <anisinha@redhat.com>\n---\n accel/kvm/kvm-all.c | 26 ++++++++++++++++++++++++++\n accel/stubs/kvm-stub.c | 10 ++++++++++\n include/system/kvm.h | 17 +++++++++++++++++\n 3 files changed, 53 insertions(+)", "diff": "diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c\nindex 5e81bf8ad2..4d4d361708 100644\n--- a/accel/kvm/kvm-all.c\n+++ b/accel/kvm/kvm-all.c\n@@ -127,6 +127,9 @@ static NotifierList kvm_irqchip_change_notifiers =\n static NotifierWithReturnList register_vmfd_changed_notifiers =\n NOTIFIER_WITH_RETURN_LIST_INITIALIZER(register_vmfd_changed_notifiers);\n \n+static NotifierWithReturnList register_vcpufd_changed_notifiers =\n+ NOTIFIER_WITH_RETURN_LIST_INITIALIZER(register_vcpufd_changed_notifiers);\n+\n static int map_kvm_run(KVMState *s, CPUState *cpu, Error **errp);\n static int map_kvm_dirty_gfns(KVMState *s, CPUState *cpu, Error **errp);\n static int vcpu_unmap_regions(KVMState *s, CPUState *cpu);\n@@ -2314,6 +2317,22 @@ static int kvm_vmfd_change_notify(Error **errp)\n &vmfd_notifier, errp);\n }\n \n+void kvm_vcpufd_add_change_notifier(NotifierWithReturn *n)\n+{\n+ notifier_with_return_list_add(®ister_vcpufd_changed_notifiers, n);\n+}\n+\n+void kvm_vcpufd_remove_change_notifier(NotifierWithReturn *n)\n+{\n+ notifier_with_return_remove(n);\n+}\n+\n+static int kvm_vcpufd_change_notify(Error **errp)\n+{\n+ return notifier_with_return_list_notify(®ister_vcpufd_changed_notifiers,\n+ &vmfd_notifier, errp);\n+}\n+\n int kvm_irqchip_get_virq(KVMState *s)\n {\n int next_virq;\n@@ -2838,6 +2857,13 @@ static int kvm_reset_vmfd(MachineState *ms)\n }\n assert(!err);\n \n+ /* notify everyone that vcpu fd has changed. */\n+ ret = kvm_vcpufd_change_notify(&err);\n+ if (ret < 0) {\n+ return ret;\n+ }\n+ assert(!err);\n+\n /* these can be only called after ram_block_rebind() */\n memory_listener_register(&kml->listener, &address_space_memory);\n memory_listener_register(&kvm_io_listener, &address_space_io);\ndiff --git a/accel/stubs/kvm-stub.c b/accel/stubs/kvm-stub.c\nindex a6e8a6e16c..c4617caac6 100644\n--- a/accel/stubs/kvm-stub.c\n+++ b/accel/stubs/kvm-stub.c\n@@ -87,6 +87,16 @@ void kvm_vmfd_remove_change_notifier(NotifierWithReturn *n)\n {\n }\n \n+void kvm_vcpufd_add_change_notifier(NotifierWithReturn *n)\n+{\n+ return;\n+}\n+\n+void kvm_vcpufd_remove_change_notifier(NotifierWithReturn *n)\n+{\n+ return;\n+}\n+\n int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,\n EventNotifier *rn, int virq)\n {\ndiff --git a/include/system/kvm.h b/include/system/kvm.h\nindex fbe23608a1..4b0e1b4ab1 100644\n--- a/include/system/kvm.h\n+++ b/include/system/kvm.h\n@@ -590,4 +590,21 @@ void kvm_vmfd_add_change_notifier(NotifierWithReturn *n);\n */\n void kvm_vmfd_remove_change_notifier(NotifierWithReturn *n);\n \n+/**\n+ * kvm_vcpufd_add_change_notifier - register a notifier to get notified when\n+ * a KVM vcpu file descriptors changes as a part of the confidential guest\n+ * \"reset\" process. Various subsystems should use this mechanism to take\n+ * actions such as re-issuing vcpu ioctls as a part of setting up vcpu\n+ * features.\n+ * @n: notifier with return value.\n+ */\n+void kvm_vcpufd_add_change_notifier(NotifierWithReturn *n);\n+\n+/**\n+ * kvm_vcpufd_remove_change_notifier - de-register a notifer previously\n+ * registered with kvm_vcpufd_add_change_notifier call.\n+ * @n: notifier that was previously registered.\n+ */\n+void kvm_vcpufd_remove_change_notifier(NotifierWithReturn *n);\n+\n #endif\n", "prefixes": [ "v4", "28/31" ] }