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bh=t1l85CW0elmLDKPawBz3akud2XKIuETu6q7m9idSpyw=; b=C//FhbjTn2sblB3lLJyYq8RvjoqBoawzgu+3lDp5U5V0sZkq7JTuc+hrqzJH7uJNjFNGHC Ep4zjue/FiI4dsjPcIsGOCapg866swBtWTj3bq5PVgwI6v07K6BgiyqGA8QpU0sb2S/Cqo Dw7HGlfdgKLy4VfHD1q4C9PWoCVa/Lc= X-MC-Unique: H-M28opqNZ2WMaCjyK-jCw-1 From: Gavin Shan To: qemu-arm@nongnu.org Cc: qemu-devel@nongnu.org, pbonzini@redhat.com, david@redhat.com, philmd@linaro.org, peter.maydell@linaro.org, shan.gavin@gmail.com Subject: [PATCH] kvm: Fix crash by initializing kvm_state early Date: Mon, 31 Jul 2023 09:48:40 +1000 Message-ID: <20230730234840.1989974-1-gshan@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 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=gshan@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_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1690760992409100003 Content-Type: text/plain; charset="utf-8" Runs into core dump on arm64 and the backtrace extracted from the core dump is shown as below. It's caused by accessing @kvm_state which isn't initialized at that point due to commit 176d073029 ("hw/arm/virt: Use machine_memory_devices_init()"), where the machine's memory region is added ealier than before. main qemu_init configure_accelerators qemu_opts_foreach do_configure_accelerator accel_init_machine kvm_init virt_kvm_type virt_set_memmap machine_memory_devices_init memory_region_add_subregion memory_region_add_subregion_common memory_region_update_container_subregions memory_region_transaction_begin qemu_flush_coalesced_mmio_buffer kvm_flush_coalesced_mmio_buffer Fix it by initializing @kvm_state early. With this applied, no crash is observed on arm64. Fixes: 176d073029 ("hw/arm/virt: Use machine_memory_devices_init()") Signed-off-by: Gavin Shan --- accel/kvm/kvm-all.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 373d876c05..c825cba12f 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -2464,6 +2464,7 @@ static int kvm_init(MachineState *ms) qemu_mutex_init(&kml_slots_lock); =20 s =3D KVM_STATE(ms->accelerator); + kvm_state =3D s; =20 /* * On systems where the kernel can support different base page @@ -2695,8 +2696,6 @@ static int kvm_init(MachineState *ms) #endif } =20 - kvm_state =3D s; - ret =3D kvm_arch_init(ms, s); if (ret < 0) { goto err; --=20 2.41.0