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Wed, 6 Mar 2024 16:08:23 GMT Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 69A5158067; Wed, 6 Mar 2024 16:08:21 +0000 (GMT) Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D0BF558052; Wed, 6 Mar 2024 16:08:20 +0000 (GMT) Received: from [9.47.158.152] (unknown [9.47.158.152]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Wed, 6 Mar 2024 16:08:20 +0000 (GMT) Message-ID: Date: Wed, 6 Mar 2024 11:08:20 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] Preserve TPM log across kexec Content-Language: en-US To: mpe@ellerman.id.au, linux-integrity@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, jarkko@kernel.org, rnsastry@linux.ibm.com, peterhuewe@gmx.de, viparash@in.ibm.com References: <20240306155511.974517-1-stefanb@linux.ibm.com> From: Stefan Berger In-Reply-To: <20240306155511.974517-1-stefanb@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: CizILsSMrSfNKbP7kCQ9XhxIyaOzFfT8 X-Proofpoint-GUID: Vt9-ZaL_JWo0hGOQxy1b3juNtgpFLarn Content-Transfer-Encoding: 7bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-03-06_10,2024-03-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 adultscore=0 phishscore=0 clxscore=1015 spamscore=0 suspectscore=0 mlxscore=0 malwarescore=0 bulkscore=0 mlxlogscore=895 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2403060130 On 3/6/24 10:55, Stefan Berger wrote: > This series resolves an issue on PowerVM and KVM on Power where the memory > the TPM log was held in may become inaccessible or corrupted after a kexec > soft reboot. The solution on these two platforms is to store the whole log > in the device tree because the device tree is preserved across a kexec with > either of the two kexec syscalls. > FYI: This was the previous attempt that didn't work with the older kexec syscall: https://lore.kernel.org/lkml/4afde78d-e138-9eee-50e0-dbd32f4dcfe0@linux.ibm.com/T/#m158630d214837e41858b03d4b025e6f96cb8f251 > Regards, > Stefan > > Stefan Berger (2): > powerpc/prom_init: Replace linux,sml-base/sml-size with linux,sml-log > tpm: of: If available Use linux,sml-log to get the log and its size > > arch/powerpc/kernel/prom_init.c | 8 ++------ > drivers/char/tpm/eventlog/of.c | 36 ++++++++++----------------------- > 2 files changed, 13 insertions(+), 31 deletions(-) >