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Violators will be prosecuted for from ; Mon, 29 Jan 2018 17:25:40 -0500 From: Stefan Berger Date: Mon, 29 Jan 2018 17:25:17 -0500 In-Reply-To: <1517264719-18288-1-git-send-email-stefanb@linux.vnet.ibm.com> References: <1517264719-18288-1-git-send-email-stefanb@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Message-Id: <1517264719-18288-5-git-send-email-stefanb@linux.vnet.ibm.com> Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PULL v2 4/6] tpm: replace GThreadPool with AIO threadpool List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: stefanb@linux.vnet.ibm.com, marcandre.lureau@redhat.com, peter.maydell@linaro.org From: Marc-Andr=C3=A9 Lureau The TPM backend uses a GThreadPool to handle IO in a seperate thread. However, GThreadPool isn't integrated with Qemu main loops, making it unnecessarily complicated to deal with. Qemu has a AIO threadpool, that is better integrated with loops and various IO functions, provides completion BH by default etc. Remove the only user of GThreadPool from qemu, use AIO threadpool. Note that the backend: - no longer accepts queing multiple requests (unneeded so far) - increase ref to itself when handling a command, for extra safety - tpm_backend_thread_end() is renamed tpm_backend_finish_sync() and will wait for completion of BH (request_completed), which will help migration handling. Signed-off-by: Marc-Andr=C3=A9 Lureau Reviewed-by: Stefan Berger Signed-off-by: Stefan Berger --- backends/tpm.c | 52 +++++++++++++++++++++++---------------= ------ include/sysemu/tpm_backend.h | 12 ++++++++-- 2 files changed, 37 insertions(+), 27 deletions(-) diff --git a/backends/tpm.c b/backends/tpm.c index 91222c5..143807a 100644 --- a/backends/tpm.c +++ b/backends/tpm.c @@ -19,30 +19,35 @@ #include "sysemu/tpm.h" #include "qemu/thread.h" #include "qemu/main-loop.h" +#include "block/thread-pool.h" +#include "qemu/error-report.h" =20 -static void tpm_backend_request_completed_bh(void *opaque) +static void tpm_backend_request_completed(void *opaque, int ret) { TPMBackend *s =3D TPM_BACKEND(opaque); TPMIfClass *tic =3D TPM_IF_GET_CLASS(s->tpmif); =20 tic->request_completed(s->tpmif); + + /* no need for atomic, as long the BQL is taken */ + s->cmd =3D NULL; + object_unref(OBJECT(s)); } =20 -static void tpm_backend_worker_thread(gpointer data, gpointer user_data) +static int tpm_backend_worker_thread(gpointer data) { - TPMBackend *s =3D TPM_BACKEND(user_data); + TPMBackend *s =3D TPM_BACKEND(data); TPMBackendClass *k =3D TPM_BACKEND_GET_CLASS(s); =20 - k->handle_request(s, (TPMBackendCmd *)data); + k->handle_request(s, s->cmd); =20 - qemu_bh_schedule(s->bh); + return 0; } =20 -static void tpm_backend_thread_end(TPMBackend *s) +void tpm_backend_finish_sync(TPMBackend *s) { - if (s->thread_pool) { - g_thread_pool_free(s->thread_pool, FALSE, TRUE); - s->thread_pool =3D NULL; + while (s->cmd) { + aio_poll(qemu_get_aio_context(), true); } } =20 @@ -74,10 +79,7 @@ int tpm_backend_startup_tpm(TPMBackend *s, size_t buff= ersize) TPMBackendClass *k =3D TPM_BACKEND_GET_CLASS(s); =20 /* terminate a running TPM */ - tpm_backend_thread_end(s); - - s->thread_pool =3D g_thread_pool_new(tpm_backend_worker_thread, s, 1= , TRUE, - NULL); + tpm_backend_finish_sync(s); =20 res =3D k->startup_tpm ? k->startup_tpm(s, buffersize) : 0; =20 @@ -93,7 +95,17 @@ bool tpm_backend_had_startup_error(TPMBackend *s) =20 void tpm_backend_deliver_request(TPMBackend *s, TPMBackendCmd *cmd) { - g_thread_pool_push(s->thread_pool, cmd, NULL); + ThreadPool *pool =3D aio_get_thread_pool(qemu_get_aio_context()); + + if (s->cmd !=3D NULL) { + error_report("There is a TPM request pending"); + return; + } + + s->cmd =3D cmd; + object_ref(OBJECT(s)); + thread_pool_submit_aio(pool, tpm_backend_worker_thread, s, + tpm_backend_request_completed, s); } =20 void tpm_backend_reset(TPMBackend *s) @@ -104,7 +116,7 @@ void tpm_backend_reset(TPMBackend *s) k->reset(s); } =20 - tpm_backend_thread_end(s); + tpm_backend_finish_sync(s); =20 s->had_startup_error =3D false; } @@ -159,28 +171,18 @@ TPMInfo *tpm_backend_query_tpm(TPMBackend *s) return info; } =20 -static void tpm_backend_instance_init(Object *obj) -{ - TPMBackend *s =3D TPM_BACKEND(obj); - - s->bh =3D qemu_bh_new(tpm_backend_request_completed_bh, s); -} - static void tpm_backend_instance_finalize(Object *obj) { TPMBackend *s =3D TPM_BACKEND(obj); =20 object_unref(OBJECT(s->tpmif)); g_free(s->id); - tpm_backend_thread_end(s); - qemu_bh_delete(s->bh); } =20 static const TypeInfo tpm_backend_info =3D { .name =3D TYPE_TPM_BACKEND, .parent =3D TYPE_OBJECT, .instance_size =3D sizeof(TPMBackend), - .instance_init =3D tpm_backend_instance_init, .instance_finalize =3D tpm_backend_instance_finalize, .class_size =3D sizeof(TPMBackendClass), .abstract =3D true, diff --git a/include/sysemu/tpm_backend.h b/include/sysemu/tpm_backend.h index 0d6c994..a69593e 100644 --- a/include/sysemu/tpm_backend.h +++ b/include/sysemu/tpm_backend.h @@ -45,9 +45,8 @@ struct TPMBackend { /*< protected >*/ TPMIf *tpmif; bool opened; - GThreadPool *thread_pool; bool had_startup_error; - QEMUBH *bh; + TPMBackendCmd *cmd; =20 /* */ char *id; @@ -197,6 +196,15 @@ TPMVersion tpm_backend_get_tpm_version(TPMBackend *s= ); size_t tpm_backend_get_buffer_size(TPMBackend *s); =20 /** + * tpm_backend_finish_sync: + * @s: the backend to call into + * + * Finish the pending command synchronously (this will call aio_poll() + * on qemu main AIOContext until it ends) + */ +void tpm_backend_finish_sync(TPMBackend *s); + +/** * tpm_backend_query_tpm: * @s: the backend * --=20 2.5.5