Re: [Xen-devel] [PATCH] add tpm_xenu.ko: Xen Virtual TPM frontend driver

["Jan Beulich" <JBeulich@suse.com>]

>>> On 07.11.12 at 19:14, Matthew Fioravante <matthew.fioravante@jhuapl.edu> wrote:
> On 11/07/2012 09:46 AM, Kent Yoder wrote:
>>> --- a/drivers/char/tpm/tpm.h
>>> +++ b/drivers/char/tpm/tpm.h
>>> @@ -130,6 +130,9 @@ struct tpm_chip {
>>>
>>>   	struct list_head list;
>>>   	void (*release) (struct device *);
>>> +#if CONFIG_XEN
>>> +	void *priv;
>>> +#endif
>>   Can you use the chip->vendor.data pointer here instead? tpm_ibmvtpm is
>> already using that as a priv pointer. I should probably change that name
>> to make it more obvious what that's used for.
> That makes more sense. I'm guessing your data pointer didn't exist 
> during the 2.6.18 kernel which is why they added their own priv pointer.

It got introduced with 3.7-rc.

>>> @@ -310,6 +313,18 @@ struct tpm_cmd_t {
>>>
>>>   ssize_t	tpm_getcap(struct device *, __be32, cap_t *, const char *);
>>>
>>> +#ifdef CONFIG_XEN
>>> +static inline void *chip_get_private(const struct tpm_chip *chip)
>>> +{
>>> +	return chip->priv;
>>> +}
>>> +
>>> +static inline void chip_set_private(struct tpm_chip *chip, void *priv)
>>> +{
>>> +	chip->priv = priv;
>>> +}
>>> +#endif
>>   Can you put these in tpm_vtpm.c please?  One less #define. :-)
> Agreed, I'd rather not have to modify your shared tpm.h interface at all.

Either such accessors should be defined here, for everyone to
use (and tpm_ibmvtpm.c get changed accordingly), or the Xen
code should access the field without wrappers too (for consistency).

Jan