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Wed, 18 Feb 2026 03:43:38 -0800 (PST) X-Received: by 2002:a17:902:f601:b0:2ab:344e:1400 with SMTP id d9443c01a7336-2ad17524ab4mr175576095ad.37.1771415017711; Wed, 18 Feb 2026 03:43:37 -0800 (PST) From: Ani Sinha To: Paolo Bonzini , Marcelo Tosatti Cc: Ani Sinha , kraxel@redhat.com, kvm@vger.kernel.org, qemu-devel@nongnu.org Subject: [PATCH v5 17/34] i386/tdx: add a pre-vmfd change notifier to reset tdx state Date: Wed, 18 Feb 2026 17:12:10 +0530 Message-ID: <20260218114233.266178-18-anisinha@redhat.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20260218114233.266178-1-anisinha@redhat.com> References: <20260218114233.266178-1-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=170.10.129.124; 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=-0.043, 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_H4=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: 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: 1771415142365158500 Content-Type: text/plain; charset="utf-8" During reset, when the VM file descriptor is changed, the TDX state needs t= o be re-initialized. A notifier callback is implemented to reset the old state and free memory before the new state is initialized post VM file descriptor change. Signed-off-by: Ani Sinha --- target/i386/kvm/tdx.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c index 37e91d95e1..4cae99c281 100644 --- a/target/i386/kvm/tdx.c +++ b/target/i386/kvm/tdx.c @@ -405,6 +405,36 @@ static void tdx_handle_reset(Object *obj, ResetType ty= pe) trace_tdx_handle_reset(); } =20 +/* TDX guest reset will require us to reinitialize some of tdx guest state= . */ +static int set_tdx_vm_uninitialized(NotifierWithReturn *notifier, + void *data, Error** errp) +{ + TdxFirmware *fw =3D &tdx_guest->tdvf; + + if (!((VmfdChangeNotifier *)data)->pre) { + return 0; + } + + if (tdx_guest->initialized) { + tdx_guest->initialized =3D false; + } + + g_free(tdx_guest->ram_entries); + + /* + * the firmware entries will be parsed again, see + * x86_firmware_configure() -> tdx_parse_tdvf() + */ + fw->entries =3D 0; + g_free(fw->entries); + + return 0; +} + +static NotifierWithReturn tdx_vmfd_change_notifier =3D { + .notify =3D set_tdx_vm_uninitialized, +}; + /* * Some CPUID bits change from fixed1 to configurable bits when TDX module * supports TDX_FEATURES0.VE_REDUCTION. e.g., MCA/MCE/MTRR/CORE_CAPABILITY. @@ -1549,6 +1579,7 @@ static void tdx_guest_init(Object *obj) =20 tdx->event_notify_vector =3D -1; tdx->event_notify_apicid =3D -1; + kvm_vmfd_add_change_notifier(&tdx_vmfd_change_notifier); qemu_register_resettable(obj); } =20 --=20 2.42.0