linux-kernel - Re: [PATCH v5 4/5] x86/tboot: Fail extended mode reduced hardware sleep

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Date:	Fri, 28 Jun 2013 12:05:13 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Ben Guthro <benjamin.guthro@...rix.com>
Cc:	Jan Beulich <jbeulich@...e.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, xen-devel@...ts.xen.org,
	tboot-devel@...ts.sourceforge.net, Gang Wei <gang.wei@...el.com>
Subject: Re: [PATCH v5 4/5] x86/tboot: Fail extended mode reduced hardware
 sleep

On Fri, Jun 28, 2013 at 09:46:23AM -0400, Ben Guthro wrote:
> As tboot currently does not support the reduced hardware sleep
> interface, fail this extended call.
> 
> Signed-off-by: Jan Beulich <jbeulich@...e.com>
> Signed-off-by: Ben Guthro <benjamin.guthro@...rix.com>
> Cc: tboot-devel@...ts.sourceforge.net
> Cc: Gang Wei <gang.wei@...el.com>
> ---
>  arch/x86/kernel/tboot.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
> index d578c9c..57383b2 100644
> --- a/arch/x86/kernel/tboot.c
> +++ b/arch/x86/kernel/tboot.c
> @@ -285,6 +285,9 @@ static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control,
>  	if (!tboot_enabled())
>  		return 0;
>  
> +	if (extended)
> +		return -1;

I would add WARN_ON just so that the user is aware of.
Perhaps

	if (WARN(extended,"tboot is not able to suspend on ACPI extended platforms. Contact
tboot-something mailing list please."))
		return -1

Otherwise
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

> +
>  	tboot_copy_fadt(&acpi_gbl_FADT);
>  	tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
>  	tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control;
> -- 
> 1.7.9.5
> 
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