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Tsirkin" , Marcel Apfelbaum Cc: Ani Sinha , qemu-devel@nongnu.org Subject: [PATCH v2 29/32] kvm/i386/apic: set local apic after vcpu file descriptors changed Date: Mon, 12 Jan 2026 18:52:42 +0530 Message-ID: <20260112132259.76855-30-anisinha@redhat.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20260112132259.76855-1-anisinha@redhat.com> References: <20260112132259.76855-1-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 (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_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_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: qemu development 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: 1768224407904158500 Content-Type: text/plain; charset="utf-8" Once the vcpu file descriptors changed after confidential guest reset, the local apic needs to be reinitialized. This change adds a callback from the vcpu fd change notifiers to reinitialize local apic for kvm x86. Signed-off-by: Ani Sinha --- hw/i386/kvm/apic.c | 13 +++++++++++++ include/hw/i386/apic_internal.h | 1 + 2 files changed, 14 insertions(+) diff --git a/hw/i386/kvm/apic.c b/hw/i386/kvm/apic.c index 82355f0463..f6f8ac2764 100644 --- a/hw/i386/kvm/apic.c +++ b/hw/i386/kvm/apic.c @@ -229,6 +229,16 @@ static void kvm_apic_reset(APICCommonState *s) run_on_cpu(CPU(s->cpu), kvm_apic_put, RUN_ON_CPU_HOST_PTR(s)); } =20 +static int apic_vcpufd_change_handler(NotifierWithReturn *n, + void *data, Error** errp) { + APICCommonState *s =3D container_of(n, APICCommonState, + vcpufd_change_notifier); + + run_on_cpu(CPU(s->cpu), kvm_apic_put, RUN_ON_CPU_HOST_PTR(s)); + + return 0; +} + static void kvm_apic_realize(DeviceState *dev, Error **errp) { APICCommonState *s =3D APIC_COMMON(dev); @@ -238,6 +248,9 @@ static void kvm_apic_realize(DeviceState *dev, Error **= errp) =20 assert(kvm_has_gsi_routing()); msi_nonbroken =3D true; + + s->vcpufd_change_notifier.notify =3D apic_vcpufd_change_handler; + kvm_vcpufd_add_change_notifier(&s->vcpufd_change_notifier); } =20 static void kvm_apic_unrealize(DeviceState *dev) diff --git a/include/hw/i386/apic_internal.h b/include/hw/i386/apic_interna= l.h index 4a62fdceb4..ffe5815e7f 100644 --- a/include/hw/i386/apic_internal.h +++ b/include/hw/i386/apic_internal.h @@ -189,6 +189,7 @@ struct APICCommonState { hwaddr vapic_paddr; /* note: persistence via kvmvapic */ bool legacy_instance_id; uint32_t extended_log_dest; + NotifierWithReturn vcpufd_change_notifier; }; =20 typedef struct VAPICState { --=20 2.42.0