path: root/drivers/char/tpm/tpm-chip.c
diff options
authorJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2017-01-06 14:03:45 +0200
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2017-04-03 22:46:01 +0300
commit745b361e989af21ad40811c2586b60229f870a68 (patch)
tree3f2cc65ab741d351b25adfd47a978cb3ffecb3d2 /drivers/char/tpm/tpm-chip.c
parent58472f5cd4f6ff02488c8da3cdbf719e9dd21e48 (diff)
tpm: infrastructure for TPM spaces
Added an ability to virtualize TPM commands into an isolated context that we call a TPM space because the word context is already heavily used in the TPM specification. Both the handle areas and bodies (where necessary) are virtualized. The mechanism works by adding a new parameter struct tpm_space to the tpm_transmit() function. This new structure contains the list of virtual handles and a buffer of page size (currently) for backing storage. When tpm_transmit() is called with a struct tpm_space instance it will execute the following sequence: 1. Take locks. 2. Load transient objects from the backing storage by using ContextLoad and map virtual handles to physical handles. 3. Perform the transaction. 4. Save transient objects to backing storage by using ContextSave and map resulting physical handle to virtual handle if there is such. This commit does not implement virtualization support for hmac and policy sessions. Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: James Bottomley <James.Bottomley@HansenPartnership.com> Reviewed-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/char/tpm/tpm-chip.c')
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index c406343848da..993b9ae42876 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -128,6 +128,7 @@ static void tpm_dev_release(struct device *dev)
+ kfree(chip->work_space.context_buf);
@@ -189,6 +190,12 @@ struct tpm_chip *tpm_chip_alloc(struct device *pdev,
chip->cdev.owner = THIS_MODULE;
chip->cdev.kobj.parent = &chip->dev.kobj;
+ chip->work_space.context_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!chip->work_space.context_buf) {
+ rc = -ENOMEM;
+ goto out;
+ }
return chip;

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