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Tue, 24 Feb 2026 19:51:33 -0800 (PST) X-Received: by 2002:a17:90b:528d:b0:34c:f92a:ad05 with SMTP id 98e67ed59e1d1-358ae810f2amr14618552a91.11.1771991493231; Tue, 24 Feb 2026 19:51:33 -0800 (PST) From: Ani Sinha To: "Michael S. Tsirkin" , Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost Cc: Ani Sinha , kraxel@redhat.com, ani@anisinha.ca, qemu-devel@nongnu.org Subject: [PATCH v6 25/35] kvm/i8254: add support for confidential guest reset Date: Wed, 25 Feb 2026 09:19:30 +0530 Message-ID: <20260225035000.385950-26-anisinha@redhat.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20260225035000.385950-1-anisinha@redhat.com> References: <20260225035000.385950-1-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: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 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_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.358, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.659, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no 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: 1771991634923158500 Content-Type: text/plain; charset="utf-8" A confidential guest reset involves closing the old virtual machine KVM file descriptor and opening a new one. Since its a new KVM fd, PIT needs to be re-initialized again. This is done with the help of a notifier which is inv= oked upon KVM vm file descriptor change during the confidential guest reset proc= ess. Signed-off-by: Ani Sinha --- hw/i386/kvm/i8254.c | 23 +++++++++++++++++++++++ hw/i386/kvm/trace-events | 1 + 2 files changed, 24 insertions(+) diff --git a/hw/i386/kvm/i8254.c b/hw/i386/kvm/i8254.c index 255047458a..70e8fd83cd 100644 --- a/hw/i386/kvm/i8254.c +++ b/hw/i386/kvm/i8254.c @@ -35,6 +35,7 @@ #include "hw/core/qdev-properties-system.h" #include "system/kvm.h" #include "target/i386/kvm/kvm_i386.h" +#include "trace.h" #include "qom/object.h" =20 #define KVM_PIT_REINJECT_BIT 0 @@ -52,6 +53,8 @@ struct KVMPITState { LostTickPolicy lost_tick_policy; bool vm_stopped; int64_t kernel_clock_offset; + + NotifierWithReturn kvmpit_vmfd_change_notifier; }; =20 struct KVMPITClass { @@ -203,6 +206,23 @@ static void kvm_pit_put(PITCommonState *pit) } } =20 +static int kvmpit_post_vmfd_change(NotifierWithReturn *notifier, + void *data, Error** errp) +{ + KVMPITState *s =3D container_of(notifier, KVMPITState, + kvmpit_vmfd_change_notifier); + + /* we are not interested in pre vmfd change notification */ + if (((VmfdChangeNotifier *)data)->pre) { + return 0; + } + + do_pit_initialize(s, errp); + + trace_kvmpit_post_vmfd_change(); + return 0; +} + static void kvm_pit_set_gate(PITCommonState *s, PITChannelState *sc, int v= al) { kvm_pit_get(s); @@ -292,6 +312,9 @@ static void kvm_pit_realizefn(DeviceState *dev, Error *= *errp) =20 qemu_add_vm_change_state_handler(kvm_pit_vm_state_change, s); =20 + s->kvmpit_vmfd_change_notifier.notify =3D kvmpit_post_vmfd_change; + kvm_vmfd_add_change_notifier(&s->kvmpit_vmfd_change_notifier); + kpc->parent_realize(dev, errp); } =20 diff --git a/hw/i386/kvm/trace-events b/hw/i386/kvm/trace-events index 67bf7f174e..33680ff82b 100644 --- a/hw/i386/kvm/trace-events +++ b/hw/i386/kvm/trace-events @@ -20,3 +20,4 @@ xenstore_reset_watches(void) "" xenstore_watch_event(const char *path, const char *token) "path %s token %= s" xen_primary_console_create(void) "" xen_primary_console_reset(int port) "port %u" +kvmpit_post_vmfd_change(void) "" --=20 2.42.0