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When rngd is run as root then lots of these types of message will appear
in the kernel log if the TPM has been configured to provide random bytes:
[ 7406.275163] tpm tpm0: tpm_transmit: tpm_recv: error -4
The issue is caused by the following call that is interrupted while
waiting for the TPM's response.
sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd);
Rather than waiting for the response in the low level driver, have it use
the polling loop in tpm_try_transmit() that uses a command's duration to
poll until a result has been returned by the TPM, thus ending when the
timeout has occurred but not responding to signals and ctrl-c anymore. To
stay in this polling loop extend tpm_ibmvtpm_status() to return
'true' for as long as the vTPM is indicated as being busy in
tpm_processing_cmd. Since the loop requires the TPM's timeouts, get them
now using tpm_get_timeouts() after setting the TPM2 version flag on the
chip.
To recreat the resolved issue start rngd like this:
sudo rngd -r /dev/hwrng -t
sudo rngd -r /dev/tpm0 -t
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1981473
Fixes: 6674ff145e ("tpm_ibmvtpm: properly handle interrupted packet receptions")
Cc: Nayna Jain <nayna@linux.ibm.com>
Cc: George Wilson <gcwilson@linux.ibm.com>
Reported-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 IBM Corporation
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*
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* Author: Ashley Lai <ashleydlai@gmail.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*/
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#ifndef __TPM_IBMVTPM_H__
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#define __TPM_IBMVTPM_H__
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/* vTPM Message Format 1 */
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struct ibmvtpm_crq {
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u8 valid;
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u8 msg;
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__be16 len;
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__be32 data;
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__be64 reserved;
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} __attribute__((packed, aligned(8)));
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struct ibmvtpm_crq_queue {
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struct ibmvtpm_crq *crq_addr;
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u32 index;
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u32 num_entry;
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wait_queue_head_t wq;
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};
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struct ibmvtpm_dev {
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struct device *dev;
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struct vio_dev *vdev;
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struct ibmvtpm_crq_queue crq_queue;
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dma_addr_t crq_dma_handle;
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u32 rtce_size;
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void __iomem *rtce_buf;
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dma_addr_t rtce_dma_handle;
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spinlock_t rtce_lock;
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wait_queue_head_t wq;
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u16 res_len;
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u32 vtpm_version;
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u8 tpm_processing_cmd;
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};
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#define CRQ_RES_BUF_SIZE PAGE_SIZE
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/* Initialize CRQ */
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#define INIT_CRQ_CMD 0xC001000000000000LL /* Init cmd */
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#define INIT_CRQ_COMP_CMD 0xC002000000000000LL /* Init complete cmd */
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#define INIT_CRQ_RES 0x01 /* Init respond */
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#define INIT_CRQ_COMP_RES 0x02 /* Init complete respond */
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#define VALID_INIT_CRQ 0xC0 /* Valid command for init crq */
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/* vTPM CRQ response is the message type | 0x80 */
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#define VTPM_MSG_RES 0x80
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#define IBMVTPM_VALID_CMD 0x80
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/* vTPM CRQ message types */
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#define VTPM_GET_VERSION 0x01
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#define VTPM_GET_VERSION_RES (0x01 | VTPM_MSG_RES)
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#define VTPM_TPM_COMMAND 0x02
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#define VTPM_TPM_COMMAND_RES (0x02 | VTPM_MSG_RES)
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#define VTPM_GET_RTCE_BUFFER_SIZE 0x03
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#define VTPM_GET_RTCE_BUFFER_SIZE_RES (0x03 | VTPM_MSG_RES)
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#define VTPM_PREPARE_TO_SUSPEND 0x04
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#define VTPM_PREPARE_TO_SUSPEND_RES (0x04 | VTPM_MSG_RES)
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#endif
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