linux-kernel - Re: [PATCH v4 1/2] vTPM: support little endian guests

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Date:	Mon, 13 Jul 2015 23:08:00 +0200
From:	Peter Hüwe <PeterHuewe@....de>
To:	"Hon Ching(Vicky) Lo" <honclo@...ux.vnet.ibm.com>
Cc:	tpmdd-devel@...ts.sourceforge.net,
	Ashley Lai <ashley@...leylai.com>,
	Vicky Lo <honclo2014@...il.com>, linux-kernel@...r.kernel.org,
	Joy Latten <jmlatten@...ux.vnet.ibm.com>
Subject: Re: [PATCH v4 1/2] vTPM: support little endian guests

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@...ux.vnet.ibm.com>
> Signed-off-by: Joy Latten <jmlatten@...ux.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
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