[{"id":3674425,"web_url":"http://patchwork.ozlabs.org/comment/3674425/","msgid":"","list_archive_url":null,"date":"2026-04-07T08:21:25","subject":"Re: [PATCH v3 04/10] hw/tpm: Implement TPM CRB chunking logic","submitter":{"id":66774,"url":"http://patchwork.ozlabs.org/api/people/66774/","name":"Marc-André Lureau","email":"marcandre.lureau@redhat.com"},"content":"Hi\n\nOn Mon, Apr 6, 2026 at 6:18 PM Arun Menon wrote:\n>\n> From: Arun Menon \n>\n> - Add logic to populate internal TPM command request and response\n> buffers and to toggle the control registers after each operation.\n> - The chunk size is limited to CRB_CTRL_CMD_SIZE which is\n> (TPM_CRB_ADDR_SIZE - A_CRB_DATA_BUFFER). This comes out as 3968 bytes\n> (4096 - 128 or 0x1000 - 0x80), because 128 bytes are reserved for\n> control and status registers. In other words, only 3968 bytes are\n> available for the TPM data.\n> - With this feature, guests can send commands larger than 3968 bytes.\n> - Refer section 6.5.3.9 of [1] for implementation details.\n>\n> [1] https://trustedcomputinggroup.org/wp-content/uploads/PC-Client-Specific-Platform-TPM-Profile-for-TPM-2p0-v1p07_rc1_121225.pdf\n\nhttps://trustedcomputinggroup.org/wp-content/uploads/PC-Client-Specific-Platform-TPM-Profile-for-TPM-2p0-v1p07_Pub.pdf\n\n>\n> Signed-off-by: Arun Menon \n> Reviewed-by: Stefan Berger \n\nReviewed-by: Marc-André Lureau \n\n> ---\n> hw/tpm/tpm_crb.c | 148 +++++++++++++++++++++++++++++++++++++++++------\n> 1 file changed, 131 insertions(+), 17 deletions(-)\n>\n> diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c\n> index d65b3e2cc1..b9f295db7a 100644\n> --- a/hw/tpm/tpm_crb.c\n> +++ b/hw/tpm/tpm_crb.c\n> @@ -17,6 +17,7 @@\n> #include \"qemu/osdep.h\"\n>\n> #include \"qemu/module.h\"\n> +#include \"qemu/error-report.h\"\n> #include \"qapi/error.h\"\n> #include \"system/address-spaces.h\"\n> #include \"hw/core/qdev-properties.h\"\n> @@ -65,6 +66,7 @@ DECLARE_INSTANCE_CHECKER(CRBState, CRB,\n> #define CRB_INTF_CAP_CRB_CHUNK 0b1\n>\n> #define CRB_CTRL_CMD_SIZE (TPM_CRB_ADDR_SIZE - A_CRB_DATA_BUFFER)\n> +#define TPM_HEADER_SIZE 10\n>\n> enum crb_loc_ctrl {\n> CRB_LOC_CTRL_REQUEST_ACCESS = BIT(0),\n> @@ -80,6 +82,8 @@ enum crb_ctrl_req {\n>\n> enum crb_start {\n> CRB_START_INVOKE = BIT(0),\n> + CRB_START_RSP_RETRY = BIT(1),\n> + CRB_START_NEXT_CHUNK = BIT(2),\n> };\n>\n> enum crb_cancel {\n> @@ -122,6 +126,69 @@ static uint8_t tpm_crb_get_active_locty(CRBState *s)\n> return ARRAY_FIELD_EX32(s->regs, CRB_LOC_STATE, activeLocality);\n> }\n>\n> +static bool tpm_crb_append_command_request(CRBState *s)\n> +{\n> + /*\n> + * The linux guest writes the TPM command to the MMIO region in chunks.\n> + * This function appends a chunk from the MMIO region to internal\n> + * command_buffer.\n> + */\n> + void *mem = memory_region_get_ram_ptr(&s->cmdmem);\n> + uint32_t to_copy = 0;\n> + uint32_t total_request_size = 0;\n> +\n> + /*\n> + * The initial call extracts the total TPM command size\n> + * from its header. For the subsequent calls, the data already\n> + * appended in the command_buffer is used to calculate the total\n> + * size, as its header stays the same.\n> + */\n> + if (s->command_buffer->len == 0) {\n> + total_request_size = tpm_cmd_get_size(mem);\n> + if (total_request_size < TPM_HEADER_SIZE) {\n> + ARRAY_FIELD_DP32(s->regs, CRB_CTRL_STS, tpmSts, 1);\n> + ARRAY_FIELD_DP32(s->regs, CRB_CTRL_START, invoke, 0);\n> + ARRAY_FIELD_DP32(s->regs, CRB_CTRL_START, nextChunk, 0);\n> + tpm_crb_clear_internal_buffers(s);\n> + error_report(\"Command size %\" PRIu32 \" less than \"\n> + \"TPM header size %\" PRIu32,\n> + total_request_size, (uint32_t)TPM_HEADER_SIZE);\n> + return false;\n> + }\n> + } else {\n> + total_request_size = tpm_cmd_get_size(s->command_buffer->data);\n> + }\n> + total_request_size = MIN(total_request_size, s->be_buffer_size);\n> +\n> + if (total_request_size > s->command_buffer->len) {\n> + uint32_t remaining = total_request_size - s->command_buffer->len;\n> + to_copy = MIN(remaining, CRB_CTRL_CMD_SIZE);\n> + g_byte_array_append(s->command_buffer, (guint8 *)mem, to_copy);\n> + }\n> + return true;\n> +}\n> +\n> +static void tpm_crb_fill_command_response(CRBState *s)\n> +{\n> + /*\n> + * Response from the tpm backend will be stored in the internal\n> + * response_buffer. This function will serve that accumulated response\n> + * to the linux guest in chunks by writing it back to MMIO region.\n> + */\n> + void *mem = memory_region_get_ram_ptr(&s->cmdmem);\n> + uint32_t remaining = s->response_buffer->len - s->response_offset;\n> + uint32_t to_copy = MIN(CRB_CTRL_CMD_SIZE, remaining);\n> +\n> + memcpy(mem, s->response_buffer->data + s->response_offset, to_copy);\n> +\n> + if (to_copy < CRB_CTRL_CMD_SIZE) {\n> + memset((guint8 *)mem + to_copy, 0, CRB_CTRL_CMD_SIZE - to_copy);\n> + }\n> +\n> + s->response_offset += to_copy;\n> + memory_region_set_dirty(&s->cmdmem, 0, CRB_CTRL_CMD_SIZE);\n> +}\n> +\n> static void tpm_crb_mmio_write(void *opaque, hwaddr addr,\n> uint64_t val, unsigned size)\n> {\n> @@ -152,20 +219,55 @@ static void tpm_crb_mmio_write(void *opaque, hwaddr addr,\n> }\n> break;\n> case A_CRB_CTRL_START:\n> - if (val == CRB_START_INVOKE &&\n> - !(s->regs[R_CRB_CTRL_START] & CRB_START_INVOKE) &&\n> - tpm_crb_get_active_locty(s) == locty) {\n> - void *mem = memory_region_get_ram_ptr(&s->cmdmem);\n> -\n> - ARRAY_FIELD_DP32(s->regs, CRB_CTRL_START, invoke, 1);\n> - s->cmd = (TPMBackendCmd) {\n> - .in = mem,\n> - .in_len = MIN(tpm_cmd_get_size(mem), s->be_buffer_size),\n> - .out = mem,\n> - .out_len = s->be_buffer_size,\n> - };\n> -\n> - tpm_backend_deliver_request(s->tpmbe, &s->cmd);\n> + if (tpm_crb_get_active_locty(s) != locty) {\n> + break;\n> + }\n> + if (s->regs[R_CRB_CTRL_START] & CRB_START_INVOKE) {\n> + /*\n> + * Backend TPM is busy processing a request.\n> + */\n> + break;\n> + }\n> + if (val & CRB_START_INVOKE) {\n> + if (!(s->regs[R_CRB_CTRL_START] & CRB_START_INVOKE)) {\n> + if (!tpm_crb_append_command_request(s)) {\n> + break;\n> + }\n> + ARRAY_FIELD_DP32(s->regs, CRB_CTRL_START, invoke, 1);\n> + g_byte_array_set_size(s->response_buffer, s->be_buffer_size);\n> + s->cmd = (TPMBackendCmd) {\n> + .in = s->command_buffer->data,\n> + .in_len = s->command_buffer->len,\n> + .out = s->response_buffer->data,\n> + .out_len = s->response_buffer->len,\n> + };\n> + tpm_backend_deliver_request(s->tpmbe, &s->cmd);\n> + }\n> + } else if (val & CRB_START_NEXT_CHUNK) {\n> + /*\n> + * nextChunk is used both while sending and receiving data.\n> + * To distinguish between the two, response_buffer is checked.\n> + * If it does not have data, then that means we have not yet\n> + * sent the command to the tpm backend, and therefore call\n> + * tpm_crb_append_command_request().\n> + */\n> + if (s->response_buffer->len > 0 &&\n> + s->response_offset < s->response_buffer->len) {\n> + tpm_crb_fill_command_response(s);\n> + } else {\n> + if (!tpm_crb_append_command_request(s)) {\n> + break;\n> + }\n> + }\n> + ARRAY_FIELD_DP32(s->regs, CRB_CTRL_START, nextChunk, 0);\n> + } else if (val & CRB_START_RSP_RETRY) {\n> + if (s->response_buffer->len > 0) {\n> + trace_tpm_crb_mmio_write(addr, size, val);\n> + s->response_offset = 0;\n> + tpm_crb_fill_command_response(s);\n> + }\n> + ARRAY_FIELD_DP32(s->regs, CRB_CTRL_START, crbRspRetry, 0);\n> + ARRAY_FIELD_DP32(s->regs, CRB_CTRL_START, nextChunk, 0);\n> }\n> break;\n> case A_CRB_LOC_CTRL:\n> @@ -210,8 +312,21 @@ static void tpm_crb_request_completed(TPMIf *ti, int ret)\n> if (ret != 0) {\n> ARRAY_FIELD_DP32(s->regs, CRB_CTRL_STS,\n> tpmSts, 1); /* fatal error */\n> + tpm_crb_clear_internal_buffers(s);\n> + } else {\n> + uint32_t actual_resp_size = tpm_cmd_get_size(s->response_buffer->data);\n> + uint32_t total_resp_size = MIN(actual_resp_size, s->be_buffer_size);\n> + g_byte_array_set_size(s->response_buffer, total_resp_size);\n> + s->response_offset = 0;\n> }\n> - memory_region_set_dirty(&s->cmdmem, 0, CRB_CTRL_CMD_SIZE);\n> + /*\n> + * Send the first chunk. Subsequent chunks will be sent\n> + * on receiving nextChunk from the guest\n> + */\n> + tpm_crb_fill_command_response(s);\n> + ARRAY_FIELD_DP32(s->regs, CRB_CTRL_START, nextChunk, 0);\n> + ARRAY_FIELD_DP32(s->regs, CRB_CTRL_START, crbRspRetry, 0);\n> + g_byte_array_set_size(s->command_buffer, 0);\n> }\n>\n> static enum TPMVersion tpm_crb_get_version(TPMIf *ti)\n> @@ -288,8 +403,7 @@ static void tpm_crb_reset(void *dev)\n> s->regs[R_CRB_CTRL_RSP_SIZE] = CRB_CTRL_CMD_SIZE;\n> s->regs[R_CRB_CTRL_RSP_ADDR] = TPM_CRB_ADDR_BASE + A_CRB_DATA_BUFFER;\n>\n> - s->be_buffer_size = MIN(tpm_backend_get_buffer_size(s->tpmbe),\n> - CRB_CTRL_CMD_SIZE);\n> + s->be_buffer_size = tpm_backend_get_buffer_size(s->tpmbe);\n>\n> if (tpm_backend_startup_tpm(s->tpmbe, s->be_buffer_size) < 0) {\n> exit(1);\n> --\n> 2.53.0\n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=eSIHCjjm;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=qJ3taXSf;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Tsirkin\" , Yanan Wang ,\n Igor Mammedov ,\n =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= ,\n Stefan Berger ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","Received-SPF":"pass client-ip=170.10.133.124; envelope-from=mlureau@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com","X-Spam_score_int":"-25","X-Spam_score":"-2.6","X-Spam_bar":"--","X-Spam_report":"(-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.54,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n 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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}}]