[Xen-devel] [PATCH v8 2/3] x86/tboot: Fail extended mode reduced hardware sleep

[Ben Guthro <benjamin.guthro@xxxxxxxxxx>]

Register for the extended sleep callback from acpi.
As tboot currently does not support the reduced hardware sleep
interface, fail this extended call.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Signed-off-by: Ben Guthro <benjamin.guthro@xxxxxxxxxx>
Cc: tboot-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Gang Wei <gang.wei@xxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 arch/x86/kernel/tboot.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index addf7b5..ade00c8 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -301,6 +301,17 @@ static int tboot_sleep(u8 sleep_state, u32 pm1a_control, 
u32 pm1b_control)
        return 0;
 }
 
+static int tboot_extended_sleep(u8 sleep_state, u32 val_a, u32 val_b)
+{
+       if (!tboot_enabled())
+               return 0;
+
+       pr_warning("tboot is not able to suspend on platforms with"
+                  " reduced hardware sleep (ACPIv5). Please contact"
+                  " tboot-devel@xxxxxxxxxxxxxxxxxxxxx mailing list.");
+       return -ENODEV;
+}
+
 static atomic_t ap_wfs_count;
 
 static int tboot_wait_for_aps(int num_aps)
@@ -422,6 +433,7 @@ static __init int tboot_late_init(void)
 #endif
 
        acpi_os_set_prepare_sleep(&tboot_sleep);
+       acpi_os_set_prepare_extended_sleep(&tboot_extended_sleep);
        return 0;
 }
 
-- 
1.7.9.5


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