linux-kernel - [PATCH v6 4/5] x86/tboot: Fail extended mode reduced hardware sleep

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Message-ID: <1372679333-8473-5-git-send-email-benjamin.guthro@citrix.com>
Date:	Mon, 1 Jul 2013 07:48:52 -0400
From:	Ben Guthro <benjamin.guthro@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	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>
CC:	Ben Guthro <benjamin.guthro@...rix.com>,
	<tboot-devel@...ts.sourceforge.net>, Gang Wei <gang.wei@...el.com>
Subject: [PATCH v6 4/5] x86/tboot: Fail extended mode reduced hardware sleep

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>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
 arch/x86/kernel/tboot.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index d578c9c..76c284f 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -285,6 +285,12 @@ static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control,
 	if (!tboot_enabled())
 		return 0;
 
+	if (extended)
+	if (WARN(extended,"tboot is not able to suspend on platforms with"
+	    " reduced hardware sleep (ACPIv5). Please contact"
+	    " tboot-devel@...ts.sourceforge.net mailing list."))
+		return -1;
+
 	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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