Re: [Qemu-ppc] [PATCH 1/2] tpm_spapr: Support TPM for ppc64 using CRQ based interface

[Cédric Le Goater]

Hello Stefan,

Some comments below. How do we populate the device tree ?

Thanks,

C.


On 12/05/2017 09:35 PM, Stefan Berger wrote:
> Implement support for TPM on ppc64 by implementing the vTPM CRQ
> interface as a frontend.
> 
> The Linux vTPM driver for ppc64 works with this emulation.
> 
> This emualtor also handles the TPM 2 case.
> 
> Signed-off-by: Stefan Berger <address@hidden>
> ---
>  hw/tpm/Makefile.objs |   1 +
>  hw/tpm/tpm_spapr.c   | 380 
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/sysemu/tpm.h |   3 +
>  qapi/tpm.json        |   5 +-
>  4 files changed, 387 insertions(+), 2 deletions(-)
>  create mode 100644 hw/tpm/tpm_spapr.c
> 
> diff --git a/hw/tpm/Makefile.objs b/hw/tpm/Makefile.objs
> index 41f0b7a..71ea63e 100644
> --- a/hw/tpm/Makefile.objs
> +++ b/hw/tpm/Makefile.objs
> @@ -1,3 +1,4 @@
>  common-obj-$(CONFIG_TPM_TIS) += tpm_tis.o
>  common-obj-$(CONFIG_TPM_PASSTHROUGH) += tpm_passthrough.o tpm_util.o
>  common-obj-$(CONFIG_TPM_EMULATOR) += tpm_emulator.o tpm_util.o
> +obj-$(CONFIG_PSERIES) += tpm_spapr.o
> diff --git a/hw/tpm/tpm_spapr.c b/hw/tpm/tpm_spapr.c
> new file mode 100644
> index 0000000..909aeeb
> --- /dev/null
> +++ b/hw/tpm/tpm_spapr.c
> @@ -0,0 +1,380 @@
> +/*
> + * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System 
> Emulator
> + *
> + * PAPR Virtual TPM
> + *
> + * Copyright (c) 2015, 2017 IBM Corporation.
> + *
> + * Authors:
> + *    Stefan Berger <address@hidden>
> + *
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a 
> copy
> + * of this software and associated documentation files (the "Software"), to 
> deal
> + * in the Software without restriction, including without limitation the 
> rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
> FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.

May be reduce a bit the header.

> + */
> +
> +#include "qemu/osdep.h"
> +#include "qapi/error.h"
> +
> +#include "sysemu/tpm_backend.h"
> +#include "tpm_int.h"
> +#include "tpm_util.h"
> +
> +#include "hw/ppc/spapr.h"
> +#include "hw/ppc/spapr_vio.h"
> +
> +#define DEBUG_SPAPR_VTPM 0
> +
> +#define DPRINTF(fmt, ...) do { \
> +    if (DEBUG_SPAPR_VTPM) { \
> +        printf(fmt, ## __VA_ARGS__); \
> +    } \
> +} while (0)

traces are prefered over printfs

> +#define VIO_SPAPR_VTPM_DEVICE(obj) \

I think you can trim the _DEVICE.

> +     OBJECT_CHECK(SPAPRvTPMState, (obj), TYPE_TPM_SPAPR)
> +
> +typedef struct vio_crq {

type definitions should always use CamelCase.

> +    uint8_t valid;  /* 0x80: cmd; 0xc0: init crq
> +                       0x81-0x83: CRQ message response */
> +    uint8_t msg;    /* see below */
> +    uint16_t len;   /* len of TPM request; len of TPM response */
> +    uint32_t data;  /* rtce_dma_handle when sending TPM request */
> +    uint64_t reserved;
> +} vio_crq;
> +
> +typedef union tpm_spapr_crq {

ditto.

> +    vio_crq s;
> +    uint8_t raw[sizeof(vio_crq)];
> +} tpm_spapr_crq;
> +
> +#define SPAPR_VTPM_VALID_INIT_CRQ_COMMAND  0xC0
> +#define SPAPR_VTPM_VALID_COMMAND           0x80
> +#define SPAPR_VTPM_MSG_RESULT              0x80
> +
> +/* msg types for valid = SPAPR_VTPM_VALID_INIT_CRQ */
> +#define SPAPR_VTPM_INIT_CRQ_RESULT           0x1
> +#define SPAPR_VTPM_INIT_CRQ_COMPLETE_RESULT  0x2
> +
> +/* msg types for valid = SPAPR_VTPM_VALID_CMD */
> +#define SPAPR_VTPM_GET_VERSION               0x1
> +#define SPAPR_VTPM_TPM_COMMAND               0x2
> +#define SPAPR_VTPM_GET_RTCE_BUFFER_SIZE      0x3
> +#define SPAPR_VTPM_PREPARE_TO_SUSPEND        0x4
> +
> +#define MAX_BUFFER_SIZE TARGET_PAGE_SIZE
> +
> +typedef struct {
> +    VIOsPAPRDevice vdev;
> +
> +    tpm_spapr_crq crq; /* track single TPM command */
> +
> +    uint8_t state;
> +#define SPAPR_VTPM_STATE_NONE         0
> +#define SPAPR_VTPM_STATE_EXECUTION    1
> +#define SPAPR_VTPM_STATE_COMPLETION   2
> +
> +    unsigned char buffer[MAX_BUFFER_SIZE];
> +
> +    TPMBackendCmd cmd;
> +
> +    TPMBackend *be_driver;
> +    TPMVersion be_tpm_version;
> +
> +    size_t be_buffer_size;
> +} SPAPRvTPMState;
> +
> +static void tpm_spapr_show_buffer(const unsigned char *buffer,
> +                                  size_t buffer_len, const char *string)
> +{
> +#if DEBUG_SPAPR_VTPM
> +    size_t i, len;
> +
> +    len = MIN(tpm_cmd_get_size(buffer), buffer_len);
> +    printf("spapr_vtpm: %s length = %zu\n", string, len);
> +    for (i = 0; i < len; i++) {
> +        if (i && !(i % 16)) {
> +            printf("\n");
> +        }
> +        printf("%.2X ", buffer[i]);
> +    }
> +    printf("\n");
> +#endif
> +}
> +
> +/*
> + * Send a request to the TPM.
> + */
> +static void tpm_spapr_tpm_send(SPAPRvTPMState *s)
> +{
> +    tpm_spapr_show_buffer(s->buffer, sizeof(s->buffer), "spapr_vtpm: Tx 
> TPM");
> +
> +    s->state = SPAPR_VTPM_STATE_EXECUTION;
> +    s->cmd = (TPMBackendCmd) {
> +        .locty = 0,
> +        .in = s->buffer,
> +        .in_len = MIN(tpm_cmd_get_size(s->buffer), sizeof(s->buffer)),
> +        .out = s->buffer,
> +        .out_len = sizeof(s->buffer),
> +    };
> +
> +    tpm_backend_deliver_request(s->be_driver, &s->cmd);
> +}
> +
> +static void tpm_spapr_got_payload(SPAPRvTPMState *s, tpm_spapr_crq *crq)
> +{
> +    long rc;
> +    DPRINTF("tpm_spapr_got_payload: crq->s.data = 0x%x  crq->s.len = %d\n",
> +            crq->s.data, crq->s.len);
> +
> +    /* a max. of be_buffer_size bytes can be transported */
> +    rc = spapr_vio_dma_read(&s->vdev, crq->s.data,
> +                            s->buffer, s->be_buffer_size);
> +    if (rc) {
> +        fprintf(stderr, "tpm_spapr_got_payload: DMA read failure !\n");

may be use error_report ? or error_setg()

> +    }
> +
> +    /* let vTPM handle any malformed request */
> +    tpm_spapr_tpm_send(s);

why not return rc ? tpm_spapr_do_crq() is a VIO 'crq.SendFunc' handler
which returns hcall errors. 

> +}
> +
> +static int tpm_spapr_do_crq(struct VIOsPAPRDevice *dev, uint8_t *crq_data)
> +{
> +    SPAPRvTPMState *s = VIO_SPAPR_VTPM_DEVICE(dev);
> +    tpm_spapr_crq local_crq;
> +    tpm_spapr_crq *crq = &s->crq; /* requests only */
> +
> +    memcpy(&local_crq.raw, crq_data, sizeof(local_crq.raw));
> +
> +    DPRINTF("VTPM: do_crq %02x %02x ...\n",
> +            local_crq.raw[0], local_crq.raw[1]);
> +
> +    switch (local_crq.s.valid) {
> +    case SPAPR_VTPM_VALID_INIT_CRQ_COMMAND: /* Init command/response */
> +
> +        /* Respond to initialization request */
> +        switch (local_crq.s.msg) {
> +        case SPAPR_VTPM_INIT_CRQ_RESULT:
> +            DPRINTF("vtpm_do_crq: SPAPR_VTPM_INIT_CRQ_RESULT\n");
> +            memset(local_crq.raw, 0, sizeof(local_crq.raw));
> +            local_crq.s.valid = SPAPR_VTPM_VALID_INIT_CRQ_COMMAND;
> +            local_crq.s.msg = SPAPR_VTPM_INIT_CRQ_RESULT;
> +            spapr_vio_send_crq(dev, local_crq.raw);
> +            break;
> +
> +        case SPAPR_VTPM_INIT_CRQ_COMPLETE_RESULT:
> +            DPRINTF("vtpm_do_crq: SPAPR_VTPM_INIT_CRQ_COMP_RESULT\n");
> +            memset(local_crq.raw, 0, sizeof(local_crq.raw));
> +            local_crq.s.valid = SPAPR_VTPM_VALID_INIT_CRQ_COMMAND;
> +            local_crq.s.msg = SPAPR_VTPM_INIT_CRQ_COMPLETE_RESULT;
> +            spapr_vio_send_crq(dev, local_crq.raw);
> +            break;
> +        }
> +
> +        break;
> +    case SPAPR_VTPM_VALID_COMMAND: /* Payloads */
> +        switch (local_crq.s.msg) {
> +        case SPAPR_VTPM_TPM_COMMAND:
> +            DPRINTF("vtpm_do_crq: got TPM command payload!\n");
> +            if (s->state == SPAPR_VTPM_STATE_EXECUTION)
> +                return H_BUSY;
> +            /* this crq is tracked */
> +            memcpy(crq->raw, crq_data, sizeof(crq->raw));
> +            crq->s.valid = be16_to_cpu(0);
> +            crq->s.len = be16_to_cpu(crq->s.len);
> +            crq->s.data = be32_to_cpu(crq->s.data);
> +            tpm_spapr_got_payload(s, crq);
> +            break;
> +
> +        case SPAPR_VTPM_GET_RTCE_BUFFER_SIZE:
> +            DPRINTF("vtpm_do_crq: resp: buffer size is %zu\n",
> +                    s->be_buffer_size);
> +            local_crq.s.msg |= SPAPR_VTPM_MSG_RESULT;
> +            local_crq.s.len = cpu_to_be16(s->be_buffer_size);
> +            spapr_vio_send_crq(dev, local_crq.raw);
> +            break;
> +
> +        case SPAPR_VTPM_GET_VERSION:
> +            local_crq.s.msg |= SPAPR_VTPM_MSG_RESULT;
> +            local_crq.s.len = cpu_to_be16(0);
> +            switch (s->be_tpm_version) {
> +            case TPM_VERSION_UNSPEC:
> +                local_crq.s.data = cpu_to_be32(0);
> +                break;
> +            case TPM_VERSION_1_2:
> +                local_crq.s.data = cpu_to_be32(1);
> +                break;
> +            case TPM_VERSION_2_0:
> +                local_crq.s.data = cpu_to_be32(2);
> +                break;
> +            }
> +            DPRINTF("vtpm_do_crq: resp: version %u\n",
> +                    local_crq.s.data);
> +            spapr_vio_send_crq(dev, local_crq.raw);
> +            break;
> +
> +        case SPAPR_VTPM_PREPARE_TO_SUSPEND:
> +            DPRINTF("vtpm_do_crq: resp: prep to suspend\n");
> +            local_crq.s.msg |= SPAPR_VTPM_MSG_RESULT;
> +            spapr_vio_send_crq(dev, local_crq.raw);
> +            break;
> +
> +        default:
> +            DPRINTF("vtpm_do_crq: Unknown message type %02x\n",
> +                    crq->s.msg);
> +        }
> +        break;
> +    default:
> +        DPRINTF("vtpm_do_crq: unknown CRQ %02x %02x ...\n",
> +                local_crq.raw[0], local_crq.raw[1]);
> +    };
> +
> +    return 0;

shouldn't it be H_SUCCESS.

> +}
> +
> +static void tpm_spapr_request_completed(TPMIf *ti)
> +{
> +    SPAPRvTPMState *s = VIO_SPAPR_VTPM_DEVICE(ti);
> +    tpm_spapr_crq *crq = &s->crq;
> +    uint32_t len;
> +    int rc;
> +
> +    tpm_spapr_show_buffer(s->buffer, sizeof(s->buffer), "spapr_vtpm: Rx 
> TPM");
> +
> +    s->state = SPAPR_VTPM_STATE_COMPLETION;
> +
> +    /* a max. of be_buffer_size bytes can be transported */
> +    len = MIN(tpm_cmd_get_size(s->buffer), s->be_buffer_size);
> +    rc = spapr_vio_dma_write(&s->vdev, crq->s.data, s->buffer, len);
> +
> +    crq->s.valid = SPAPR_VTPM_MSG_RESULT;
> +    crq->s.msg = SPAPR_VTPM_TPM_COMMAND | SPAPR_VTPM_MSG_RESULT;
> +    crq->s.len = cpu_to_be16(len);
> +    crq->s.data = cpu_to_be32(crq->s.data);
> +
> +    if (rc == 0) {
> +        rc = spapr_vio_send_crq(&s->vdev, crq->raw);
> +        if (rc) {
> +            DPRINTF("%s: Error sending response\n", __func__);
> +        }
> +    } else {
> +        DPRINTF("%s: Error with DMA write\n", __func__);
> +    }

These DPRINTF look like errors to me.

> +}
> +
> +static int tpm_spapr_do_startup_tpm(SPAPRvTPMState *s, size_t buffersize)
> +{
> +    return tpm_backend_startup_tpm(s->be_driver, buffersize);
> +}
> +
> +static void tpm_spapr_reset(VIOsPAPRDevice *dev)
> +{
> +    SPAPRvTPMState *s = VIO_SPAPR_VTPM_DEVICE(dev);
> +
> +    s->state = SPAPR_VTPM_STATE_NONE;
> +
> +    s->be_tpm_version = tpm_backend_get_tpm_version(s->be_driver);
> +
> +    s->be_buffer_size = 
> MAX(ROUND_UP(tpm_backend_get_buffer_size(s->be_driver),
> +                                     TARGET_PAGE_SIZE),
> +                            sizeof(s->buffer));
> +
> +    tpm_backend_reset(s->be_driver);
> +    tpm_spapr_do_startup_tpm(s, s->be_buffer_size);
> +}
> +
> +static enum TPMVersion tpm_spapr_get_version(TPMIf *ti)
> +{
> +    SPAPRvTPMState *s = VIO_SPAPR_VTPM_DEVICE(ti);
> +
> +    if (tpm_backend_had_startup_error(s->be_driver)) {
> +        return TPM_VERSION_UNSPEC;
> +    }
> +
> +    return tpm_backend_get_tpm_version(s->be_driver);
> +}
> +
> +static const VMStateDescription vmstate_spapr_vtpm = {
> +    .name = "tpm_spapr",
> +    .unmigratable = 1,
> +};
> +
> +static Property tpm_spapr_properties[] = {
> +    DEFINE_SPAPR_PROPERTIES(SPAPRvTPMState, vdev),
> +    DEFINE_PROP_TPMBE("tpmdev", SPAPRvTPMState, be_driver),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void tpm_spapr_realizefn(VIOsPAPRDevice *dev, Error **errp)
> +{
> +    SPAPRvTPMState *s = VIO_SPAPR_VTPM_DEVICE(dev);
> +
> +    if (!tpm_find()) {
> +        error_setg(errp, "at most one TPM device is permitted");
> +        return;
> +    }
>
tpm_find() does not exist anymore. It was replaced by tpm_get_version()
AFAICT in commit 5cb18b3d7bff.

> +    dev->crq.SendFunc = tpm_spapr_do_crq;
> +
> +    if (!s->be_driver) {
> +        error_setg(errp, "'tpmdev' property is required");
> +        return;
> +    }
> +
> +}
> +
> +static void tpm_spapr_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
> +    TPMIfClass *tc = TPM_IF_CLASS(klass);
> +
> +    k->realize = tpm_spapr_realizefn;
> +    k->reset = tpm_spapr_reset;
> +    //k->devnode = tpm_spapr_devnode;
> +    k->dt_name = "vtpm";
> +    k->dt_type = "IBM,vtpm";
> +    k->dt_compatible = "IBM,vtpm";
> +    k->signal_mask = 0x00000001;
> +    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
> +    dc->props = tpm_spapr_properties;
> +    k->rtce_window_size = 0x10000000;
> +    dc->vmsd = &vmstate_spapr_vtpm;
> +
> +    tc->model = TPM_MODEL_TPM_SPAPR;
> +    tc->get_version = tpm_spapr_get_version;
> +    tc->request_completed = tpm_spapr_request_completed;
> +}
> +
> +static const TypeInfo tpm_spapr_info = {
> +    .name          = TYPE_TPM_SPAPR,
> +    .parent        = TYPE_VIO_SPAPR_DEVICE,
> +    .instance_size = sizeof(SPAPRvTPMState),
> +    .class_init    = tpm_spapr_class_init,
> +    .interfaces = (InterfaceInfo[]) {
> +        { TYPE_TPM_IF },
> +        { }
> +    }
> +};
> +
> +static void tpm_spapr_register_types(void)
> +{
> +    type_register_static(&tpm_spapr_info);
> +}
> +
> +type_init(tpm_spapr_register_types)
> diff --git a/include/sysemu/tpm.h b/include/sysemu/tpm.h
> index 852e026..afefadd 100644
> --- a/include/sysemu/tpm.h
> +++ b/include/sysemu/tpm.h
> @@ -46,9 +46,12 @@ typedef struct TPMIfClass {
>  } TPMIfClass;
>  
>  #define TYPE_TPM_TIS                "tpm-tis"
> +#define TYPE_TPM_SPAPR              "tpm-spapr"
>  
>  #define TPM_IS_TIS(chr)                             \
>      object_dynamic_cast(OBJECT(chr), TYPE_TPM_TIS)
> +#define TPM_IS_SPAPR(chr)                           \
> +    object_dynamic_cast(OBJECT(chr), TYPE_TPM_SPAPR)
>  
>  /* returns NULL unless there is exactly one TPM device */
>  static inline TPMIf *tpm_find(void)
> diff --git a/qapi/tpm.json b/qapi/tpm.json
> index 7093f26..dfa6a32 100644
> --- a/qapi/tpm.json
> +++ b/qapi/tpm.json
> @@ -11,10 +11,11 @@
>  # An enumeration of TPM models
>  #
>  # @tpm-tis: TPM TIS model
> +# @tpm-spapr: TPM PAPR model (since 2.12)
>  #
>  # Since: 1.5
>  ##
> -{ 'enum': 'TpmModel', 'data': [ 'tpm-tis' ] }
> +{ 'enum': 'TpmModel', 'data': [ 'tpm-tis', 'tpm-spapr' ] }
>  
>  ##
>  # @query-tpm-models:
> @@ -28,7 +29,7 @@
>  # Example:
>  #
>  # -> { "execute": "query-tpm-models" }
> -# <- { "return": [ "tpm-tis" ] }
> +# <- { "return": [ "tpm-tis", "tpm-spapr" ] }
>  #
>  ##
>  { 'command': 'query-tpm-models', 'returns': ['TpmModel'] }
>