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Szmigiero" Cc: vkuznets@redhat.com, kraxel@redhat.com, pbonzini@redhat.com, qemu-devel@nongnu.org, Ani Sinha Subject: [PATCH v1 21/28] hw/hyperv/vmbus: add support for confidential guest reset Date: Fri, 12 Dec 2025 20:33:49 +0530 Message-ID: <20251212150359.548787-22-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: 8bit 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On confidential guests when the KVM virtual machine file descriptor changes as a part of the reset process, event file descriptors needs to be reassociated with the new KVM VM file descriptor. This is achieved with the help of a callback handler that gets called when KVM VM file descriptor changes during the confidential guest reset process. Signed-off-by: Ani Sinha --- hw/hyperv/vmbus.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c index 961406cdd6..4763c0aebc 100644 --- a/hw/hyperv/vmbus.c +++ b/hw/hyperv/vmbus.c @@ -19,6 +19,7 @@ #include "hw/hyperv/vmbus.h" #include "hw/hyperv/vmbus-bridge.h" #include "hw/sysbus.h" +#include "system/kvm.h" #include "exec/target_page.h" #include "trace.h" @@ -247,6 +248,12 @@ struct VMBus { * interrupt page */ EventNotifier notifier; + + /* + * Notifier to inform when vmfd is changed as a part of confidential guest + * reset mechanism. + */ + NotifierWithReturn vmbus_vmfd_change_notifier; }; static bool gpadl_full(VMBusGpadl *gpadl) @@ -2346,6 +2353,26 @@ static void vmbus_dev_unrealize(DeviceState *dev) free_channels(vdev); } +/* + * If the KVM fd changes because of VM reset in confidential guests, + * reassociate event fd with the new KVM fd. + */ +static int vmbus_handle_vmfd_change(NotifierWithReturn *notifier, + void *data, Error** errp) +{ + VMBus *vmbus = container_of(notifier, VMBus, + vmbus_vmfd_change_notifier); + int ret = 0; + ret = hyperv_set_event_flag_handler(VMBUS_EVENT_CONNECTION_ID, + &vmbus->notifier); + /* if we are only using userland event handler, it may already exist */ + if (ret != 0 && ret != -EEXIST) { + error_setg(errp, "hyperv set event handler failed with %d", ret); + } + + return ret; +} + static const Property vmbus_dev_props[] = { DEFINE_PROP_UUID("instanceid", VMBusDevice, instanceid), }; @@ -2428,6 +2455,9 @@ static void vmbus_realize(BusState *bus, Error **errp) goto clear_event_notifier; } + vmbus->vmbus_vmfd_change_notifier.notify = vmbus_handle_vmfd_change; + kvm_vmfd_add_change_notifier(&vmbus->vmbus_vmfd_change_notifier); + return; clear_event_notifier: -- 2.42.0