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

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Date:	Thu, 8 Nov 2012 16:06:14 -0600
From:	Kent Yoder <shpedoikal@...il.com>
To:	"Fioravante, Matthew E." <Matthew.Fioravante@...apl.edu>
Cc:	Kent Yoder <key@...ux.vnet.ibm.com>,
	Jan Beulich <JBeulich@...e.com>,
	"jeremy@...p.org" <jeremy@...p.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mail@...jiv.net" <mail@...jiv.net>,
	"tpmdd-devel@...ts.sourceforge.net" 
	<tpmdd-devel@...ts.sourceforge.net>
Subject: Re: [tpmdd-devel] [Xen-devel] [PATCH] add tpm_xenu.ko: Xen Virtual
 TPM frontend driver

On Thu, Nov 8, 2012 at 9:36 AM, Fioravante, Matthew E.
<Matthew.Fioravante@...apl.edu> wrote:
>> >>> On 07.11.12 at 19:14, Matthew Fioravante <matthew.fioravante@...apl.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).
>
>   Agreed. I'll update tpm_ibmvtpm.
>
> Kent
>
> So what is the consensus, you're going to use accessors in ibmvtpm? I was just about to remove them from my side.

  Yeah I'll use your accessor.  Just modify it to use
chip->vendor.data and I'll add suport to tpm_ibmvtpm after I integrate
your patch.

Thanks!
Kent

>>
>> Jan
>>
>
>
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