From: "Peter Hüwe" <PeterHuewe@gmx.de>
To: "Hon Ching(Vicky) Lo" <honclo@linux.vnet.ibm.com>
Cc: tpmdd-devel@lists.sourceforge.net,
Ashley Lai <ashley@ashleylai.com>,
Vicky Lo <honclo2014@gmail.com>,
linux-kernel@vger.kernel.org,
Joy Latten <jmlatten@linux.vnet.ibm.com>
Subject: Re: [PATCH v4 1/2] vTPM: support little endian guests
Date: Thu, 16 Jul 2015 20:43:52 +0200 [thread overview]
Message-ID: <201507162043.52754.PeterHuewe@gmx.de> (raw)
In-Reply-To: <1437069255.29298.5.camel@vtpm2014.ibm.com>
Hi Vicky,
Am Donnerstag, 16. Juli 2015, 19:54:15 schrieb Hon Ching(Vicky) Lo:
> Hi Peter,
>
> On Mon, 2015-07-13 at 23:08 +0200, Peter Hüwe wrote:
> > Hi Vicky,
> >
> > sorry for the late reply
> >
> > > This patch makes the code endianness independent. We defined a
> > > macro do_endian_conversion to apply endianness to raw integers
> > > in the event entries so that they will be displayed properly.
> > > tpm_binary_bios_measurements_show() is modified for the display.
> > >
> > > Signed-off-by: Hon Ching(Vicky) Lo <honclo@linux.vnet.ibm.com>
> > > Signed-off-by: Joy Latten <jmlatten@linux.vnet.ibm.com>
> > >
> > > b/drivers/char/tpm/tpm_eventlog.h index e7da086..267bfbd 100644
> > > --- a/drivers/char/tpm/tpm_eventlog.h
> > > +++ b/drivers/char/tpm/tpm_eventlog.h
> > > @@ -6,6 +6,12 @@
> > >
> > > #define MAX_TEXT_EVENT 1000 /* Max event string length */
> > > #define ACPI_TCPA_SIG "TCPA" /* 0x41504354 /'TCPA' */
> > >
> > > +#ifdef CONFIG_PPC64
> > > +#define do_endian_conversion(x) be32_to_cpu(x)
> > > +#else
> > > +#define do_endian_conversion(x) x
> > > +#endif
> >
> > Why is this macro needed?
> > shouldn't the be32_to_cpu macro already do correct thing?
> > Or am I missing something here?
> >
> >
> > Thanks,
> > Peter
>
> The macro is defined to not do the conversion in the architecture
> that does not need it.
Unfortunately I'm still not convinced this is needed?
be32_to_cpu(x)
should already do the right thing if no conversion is needed ? (being defined
as (x))
Or is it not?
Peter
next prev parent reply other threads:[~2015-07-16 18:42 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-17 22:17 [PATCH v4 1/2] vTPM: support little endian guests Hon Ching(Vicky) Lo
2015-06-17 22:17 ` [PATCH v4 2/2] TPM: remove unnecessary little endian conversion Hon Ching(Vicky) Lo
2015-06-18 13:23 ` Ashley Lai
2015-06-29 18:52 ` Hon Ching(Vicky) Lo
2015-06-18 13:23 ` [PATCH v4 1/2] vTPM: support little endian guests Ashley Lai
2015-06-29 18:43 ` Hon Ching(Vicky) Lo
2015-06-29 18:51 ` Hon Ching(Vicky) Lo
2015-07-13 21:08 ` Peter Hüwe
2015-07-16 17:54 ` Hon Ching(Vicky) Lo
2015-07-16 18:43 ` Peter Hüwe [this message]
2015-07-17 20:07 ` Hon Ching(Vicky) Lo
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