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Sat, 12 Apr 2025 19:16:05 +0000 Received: from DS7PR10MB5328.namprd10.prod.outlook.com ([fe80::ea13:c6c1:9956:b29c]) by DS7PR10MB5328.namprd10.prod.outlook.com ([fe80::ea13:c6c1:9956:b29c%6]) with mapi id 15.20.8632.030; Sat, 12 Apr 2025 19:16:05 +0000 Message-ID: <40d90268-272c-45b1-add5-220e9e162101@oracle.com> Date: Sun, 13 Apr 2025 00:45:52 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 16/19] tpm, tpm_tis: Allow locality to be set to a different value To: Ross Philipson , linux-kernel@vger.kernel.org, x86@kernel.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org, kexec@lists.infradead.org, linux-efi@vger.kernel.org, iommu@lists.linux.dev Cc: dpsmith@apertussolutions.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, ardb@kernel.org, mjg59@srcf.ucam.org, James.Bottomley@hansenpartnership.com, peterhuewe@gmx.de, jarkko@kernel.org, jgg@ziepe.ca, luto@amacapital.net, nivedita@alum.mit.edu, herbert@gondor.apana.org.au, davem@davemloft.net, corbet@lwn.net, ebiederm@xmission.com, dwmw2@infradead.org, baolu.lu@linux.intel.com, kanth.ghatraju@oracle.com, andrew.cooper3@citrix.com, trenchboot-devel@googlegroups.com References: <20250410204149.2576104-1-ross.philipson@oracle.com> <20250410204149.2576104-17-ross.philipson@oracle.com> Content-Language: en-US From: ALOK TIWARI In-Reply-To: <20250410204149.2576104-17-ross.philipson@oracle.com> Content-Type: text/plain; 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Provide > a one-shot function tpm_chip_set_locality() for the purpose. > > Signed-off-by: Ross Philipson > Signed-off-by: Jarkko Sakkinen > --- > drivers/char/tpm/tpm-chip.c | 33 ++++++++++++++++++++++++++++++++- > drivers/char/tpm/tpm_tis_core.c | 2 ++ > include/linux/tpm.h | 4 ++++ > 3 files changed, 38 insertions(+), 1 deletion(-) > > +/** > + * tpm_chip_set_locality() - Set the TPM locality kernel uses > + * @chip: &tpm_chip instance > + * @locality: new locality > + * > + * This a one-shot function. Returns zero or POSIX error on failure. > + */ > +int tpm_chip_set_locality(struct tpm_chip *chip, u8 locality) > +{ > + int ret; > + > + if (locality < 0 || locality >= TPM_MAX_LOCALITY) > + return -EINVAL; > + > + ret = tpm_try_get_ops(chip); > + if (ret) > + return ret; > + > + if (!(chip->flags & TPM_CHIP_FLAG_SET_LOCALITY_ENABLED)) { > + tpm_put_ops(chip); > + return -EINVAL; > + } > + > + chip->kernel_locality = locality; > + chip->flags &= ~TPM_CHIP_FLAG_SET_LOCALITY_ENABLED; > + tpm_put_ops(chip); > + return 0; a '\n' before return is customary > +} > +EXPORT_SYMBOL_GPL(tpm_chip_set_locality); > diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c Thanks, Alok