From 9375c44fdfc07c0fef3052a3f25a13197a528902 Mon Sep 17 00:00:00 2001 From: Stefan Berger Date: Sat, 4 Nov 2017 19:57:15 -0400 Subject: tpm: tpm_emulator: get and set buffer size of device MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Convert the tpm_emulator backend to get the current buffer size of the external device and set it to the buffer size that the frontend (TIS) requests. Signed-off-by: Stefan Berger Reviewed-by: Marc-André Lureau --- backends/tpm.c | 4 +-- hw/tpm/tpm_emulator.c | 79 +++++++++++++++++++++++++++++++++++++++++--- hw/tpm/tpm_ioctl.h | 28 +++++++++++++++- hw/tpm/tpm_tis.c | 6 ++-- include/sysemu/tpm_backend.h | 6 ++-- 5 files changed, 111 insertions(+), 12 deletions(-) diff --git a/backends/tpm.c b/backends/tpm.c index cb49185d4b..91222c5164 100644 --- a/backends/tpm.c +++ b/backends/tpm.c @@ -68,7 +68,7 @@ int tpm_backend_init(TPMBackend *s, TPMIf *tpmif, Error **errp) return 0; } -int tpm_backend_startup_tpm(TPMBackend *s) +int tpm_backend_startup_tpm(TPMBackend *s, size_t buffersize) { int res = 0; TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); @@ -79,7 +79,7 @@ int tpm_backend_startup_tpm(TPMBackend *s) s->thread_pool = g_thread_pool_new(tpm_backend_worker_thread, s, 1, TRUE, NULL); - res = k->startup_tpm ? k->startup_tpm(s) : 0; + res = k->startup_tpm ? k->startup_tpm(s, buffersize) : 0; s->had_startup_error = (res != 0); diff --git a/hw/tpm/tpm_emulator.c b/hw/tpm/tpm_emulator.c index 44a769d86b..3ae8bf6c5a 100644 --- a/hw/tpm/tpm_emulator.c +++ b/hw/tpm/tpm_emulator.c @@ -232,13 +232,14 @@ static int tpm_emulator_check_caps(TPMEmulator *tpm_emu) switch (tpm_emu->tpm_version) { case TPM_VERSION_1_2: caps = PTM_CAP_INIT | PTM_CAP_SHUTDOWN | PTM_CAP_GET_TPMESTABLISHED | - PTM_CAP_SET_LOCALITY | PTM_CAP_SET_DATAFD; + PTM_CAP_SET_LOCALITY | PTM_CAP_SET_DATAFD | PTM_CAP_STOP | + PTM_CAP_SET_BUFFERSIZE; tpm = "1.2"; break; case TPM_VERSION_2_0: caps = PTM_CAP_INIT | PTM_CAP_SHUTDOWN | PTM_CAP_GET_TPMESTABLISHED | PTM_CAP_SET_LOCALITY | PTM_CAP_RESET_TPMESTABLISHED | - PTM_CAP_SET_DATAFD; + PTM_CAP_SET_DATAFD | PTM_CAP_STOP | PTM_CAP_SET_BUFFERSIZE; tpm = "2"; break; case TPM_VERSION_UNSPEC: @@ -255,12 +256,76 @@ static int tpm_emulator_check_caps(TPMEmulator *tpm_emu) return 0; } -static int tpm_emulator_startup_tpm(TPMBackend *tb) +static int tpm_emulator_stop_tpm(TPMBackend *tb) +{ + TPMEmulator *tpm_emu = TPM_EMULATOR(tb); + ptm_res res; + + if (tpm_emulator_ctrlcmd(tpm_emu, CMD_STOP, &res, 0, sizeof(res)) < 0) { + error_report("tpm-emulator: Could not stop TPM: %s", + strerror(errno)); + return -1; + } + + res = be32_to_cpu(res); + if (res) { + error_report("tpm-emulator: TPM result for CMD_STOP: 0x%x", res); + return -1; + } + + return 0; +} + +static int tpm_emulator_set_buffer_size(TPMBackend *tb, + size_t wanted_size, + size_t *actual_size) +{ + TPMEmulator *tpm_emu = TPM_EMULATOR(tb); + ptm_setbuffersize psbs; + + if (tpm_emulator_stop_tpm(tb) < 0) { + return -1; + } + + psbs.u.req.buffersize = cpu_to_be32(wanted_size); + + if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_BUFFERSIZE, &psbs, + sizeof(psbs.u.req), sizeof(psbs.u.resp)) < 0) { + error_report("tpm-emulator: Could not set buffer size: %s", + strerror(errno)); + return -1; + } + + psbs.u.resp.tpm_result = be32_to_cpu(psbs.u.resp.tpm_result); + if (psbs.u.resp.tpm_result != 0) { + error_report("tpm-emulator: TPM result for set buffer size : 0x%x", + psbs.u.resp.tpm_result); + return -1; + } + + if (actual_size) { + *actual_size = be32_to_cpu(psbs.u.resp.buffersize); + } + + DPRINTF("buffer size: %u, min: %u, max: %u\n", + be32_to_cpu(psbs.u.resp.buffersize), + be32_to_cpu(psbs.u.resp.minsize), + be32_to_cpu(psbs.u.resp.maxsize)); + + return 0; +} + +static int tpm_emulator_startup_tpm(TPMBackend *tb, size_t buffersize) { TPMEmulator *tpm_emu = TPM_EMULATOR(tb); ptm_init init; ptm_res res; + if (buffersize != 0 && + tpm_emulator_set_buffer_size(tb, buffersize, NULL) < 0) { + goto err_exit; + } + DPRINTF("%s", __func__); if (tpm_emulator_ctrlcmd(tpm_emu, CMD_INIT, &init, sizeof(init), sizeof(init)) < 0) { @@ -358,7 +423,13 @@ static TPMVersion tpm_emulator_get_tpm_version(TPMBackend *tb) static size_t tpm_emulator_get_buffer_size(TPMBackend *tb) { - return 4096; + size_t actual_size; + + if (tpm_emulator_set_buffer_size(tb, 0, &actual_size) < 0) { + return 4096; + } + + return actual_size; } static int tpm_emulator_block_migration(TPMEmulator *tpm_emu) diff --git a/hw/tpm/tpm_ioctl.h b/hw/tpm/tpm_ioctl.h index 33564b11de..54c8d345ad 100644 --- a/hw/tpm/tpm_ioctl.h +++ b/hw/tpm/tpm_ioctl.h @@ -169,6 +169,28 @@ struct ptm_getconfig { #define PTM_CONFIG_FLAG_FILE_KEY 0x1 #define PTM_CONFIG_FLAG_MIGRATION_KEY 0x2 +/* + * PTM_SET_BUFFERSIZE: Set the buffer size to be used by the TPM. + * A 0 on input queries for the current buffer size. Any other + * number will try to set the buffer size. The returned number is + * the buffer size that will be used, which can be larger than the + * requested one, if it was below the minimum, or smaller than the + * requested one, if it was above the maximum. + */ +struct ptm_setbuffersize { + union { + struct { + uint32_t buffersize; /* 0 to query for current buffer size */ + } req; /* request */ + struct { + ptm_res tpm_result; + uint32_t buffersize; /* buffer size in use */ + uint32_t minsize; /* min. supported buffer size */ + uint32_t maxsize; /* max. supported buffer size */ + } resp; /* response */ + } u; +}; + typedef uint64_t ptm_cap; typedef struct ptm_est ptm_est; @@ -179,6 +201,7 @@ typedef struct ptm_init ptm_init; typedef struct ptm_getstate ptm_getstate; typedef struct ptm_setstate ptm_setstate; typedef struct ptm_getconfig ptm_getconfig; +typedef struct ptm_setbuffersize ptm_setbuffersize; /* capability flags returned by PTM_GET_CAPABILITY */ #define PTM_CAP_INIT (1) @@ -194,6 +217,7 @@ typedef struct ptm_getconfig ptm_getconfig; #define PTM_CAP_STOP (1 << 10) #define PTM_CAP_GET_CONFIG (1 << 11) #define PTM_CAP_SET_DATAFD (1 << 12) +#define PTM_CAP_SET_BUFFERSIZE (1 << 13) enum { PTM_GET_CAPABILITY = _IOR('P', 0, ptm_cap), @@ -212,6 +236,7 @@ enum { PTM_STOP = _IOR('P', 13, ptm_res), PTM_GET_CONFIG = _IOR('P', 14, ptm_getconfig), PTM_SET_DATAFD = _IOR('P', 15, ptm_res), + PTM_SET_BUFFERSIZE = _IOWR('P', 16, ptm_setbuffersize), }; /* @@ -240,7 +265,8 @@ enum { CMD_SET_STATEBLOB, CMD_STOP, CMD_GET_CONFIG, - CMD_SET_DATAFD + CMD_SET_DATAFD, + CMD_SET_BUFFERSIZE, }; #endif /* _TPM_IOCTL_H */ diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c index bd22e699bb..b8e811b086 100644 --- a/hw/tpm/tpm_tis.c +++ b/hw/tpm/tpm_tis.c @@ -974,9 +974,9 @@ static const MemoryRegionOps tpm_tis_memory_ops = { }, }; -static int tpm_tis_do_startup_tpm(TPMState *s) +static int tpm_tis_do_startup_tpm(TPMState *s, uint32_t buffersize) { - return tpm_backend_startup_tpm(s->be_driver); + return tpm_backend_startup_tpm(s->be_driver, buffersize); } static void tpm_tis_realloc_buffer(TPMSizedBuffer *sb, @@ -1044,7 +1044,7 @@ static void tpm_tis_reset(DeviceState *dev) tpm_tis_realloc_buffer(&s->loc[c].r_buffer, s->be_buffer_size); } - tpm_tis_do_startup_tpm(s); + tpm_tis_do_startup_tpm(s, 0); } static const VMStateDescription vmstate_tpm_tis = { diff --git a/include/sysemu/tpm_backend.h b/include/sysemu/tpm_backend.h index 7c98b6100d..0d6c994a62 100644 --- a/include/sysemu/tpm_backend.h +++ b/include/sysemu/tpm_backend.h @@ -66,7 +66,7 @@ struct TPMBackendClass { TPMBackend *(*create)(QemuOpts *opts); /* start up the TPM on the backend - optional */ - int (*startup_tpm)(TPMBackend *t); + int (*startup_tpm)(TPMBackend *t, size_t buffersize); /* optional */ void (*reset)(TPMBackend *t); @@ -112,10 +112,12 @@ int tpm_backend_init(TPMBackend *s, TPMIf *tpmif, Error **errp); /** * tpm_backend_startup_tpm: * @s: the backend whose TPM support is to be started + * @buffersize: the buffer size the TPM is supposed to use, + * 0 to leave it as-is * * Returns 0 on success. */ -int tpm_backend_startup_tpm(TPMBackend *s); +int tpm_backend_startup_tpm(TPMBackend *s, size_t buffersize); /** * tpm_backend_had_startup_error: -- cgit v1.2.1