From: Nageswara R Sastry <nasastry@in.ibm.com>
To: Stefan Berger <stefanb@linux.ibm.com>,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Cc: "nayna@linux.ibm.com" <nayna@linux.ibm.com>,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
Eric Biederman <ebiederm@xmission.com>
Subject: Re: [PATCH 2/3] tpm/kexec: Duplicate TPM measurement log in of-tree for kexec
Date: Tue, 14 Jun 2022 16:46:38 +0000 [thread overview]
Message-ID: <MWHPR15MB1150C0B62285E3F7A1C5B736EBAA9@MWHPR15MB1150.namprd15.prod.outlook.com> (raw)
In-Reply-To: <20220614161258.1741427-3-stefanb@linux.ibm.com>
> The memory area of the TPM measurement log is currently not properly
> duplicated for carrying it across kexec when an Open Firmware
> Devicetree is used. Therefore, the contents of the log get corrupted.
> Fix this for the kexec_file_load() syscall by allocating a buffer and
> copying the contents of the existing log into it. The new buffer is
> preserved across the kexec and a pointer to it is available when the new
> kernel is started. To achieve this, store the allocated buffer's address
> in the flattened device tree (fdt) under the name linux,tpm-kexec-buffer
> and search for this entry early in the kernel startup before the TPM
> subsystem starts up. Adjust the pointer in the of-tree stored under
> linux,sml-base to point to this buffer holding the preserved log. The
> TPM driver can then read the base address from this entry when making
> the log available.
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
...
> --
> 2.35.1
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next prev parent reply other threads:[~2022-06-14 16:46 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-14 16:12 [PATCH 0/3] tpm: Preserve TPM measurement log across kexec Stefan Berger
2022-06-14 16:12 ` [PATCH 1/3] of: kexec: Refactor IMA buffer related functions to make them reusable Stefan Berger
2022-06-14 16:35 ` Nageswara R Sastry
2022-06-14 16:12 ` [PATCH 2/3] tpm/kexec: Duplicate TPM measurement log in of-tree for kexec Stefan Berger
2022-06-14 16:46 ` Nageswara R Sastry [this message]
2022-06-14 17:48 ` Rob Herring
2022-06-15 13:08 ` Stefan Berger
2022-06-15 20:14 ` Rob Herring
2022-06-15 21:45 ` Stefan Berger
2022-06-15 20:18 ` Rob Herring
2022-06-14 18:58 ` kernel test robot
2022-06-15 0:54 ` kernel test robot
2022-06-15 9:42 ` kernel test robot
2022-06-14 16:12 ` [PATCH 3/3] tpm: of: Call of_tpm_get_sml_parameters() to get base and size of log Stefan Berger
2022-06-14 16:47 ` Nageswara R Sastry
2022-06-15 21:25 ` Jarkko Sakkinen
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