Most server-class hardware doesn't support ACPI S3 suspend; but most
bugs we'll run across won't need actual S3 to trigger. Add a
command-line parameter for a "fake" S3, which will do everything
during suspend/restore except actually calling into the ACPI S3
handler.
Signed-off-by: Ben Guthro <benjamin.gut...@citrix.com>
Signed-off-by: George Dunlap <george.dun...@citrix.com>
---
This was originally posted in 2013, but never actually checked in.
I've removed an extraneous line, and changed the underscore in the
option into a dash (as Jan seems to prefer).
Compile-tested only.
If we want osstest to be able to test this functionality it should
probably be backported.
CC: Ian Jackson <ian.jack...@citrix.com>
CC: Dario Faggioli <dfaggi...@suse.com>
CC: Andrew Cooper <andrew.coop...@citrix.com>
CC: Jan Beulich <jbeul...@suse.com>
CC: Marek Marczykowski-Górecki <marma...@invisiblethingslab.com>
---
xen/arch/x86/acpi/power.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/xen/arch/x86/acpi/power.c b/xen/arch/x86/acpi/power.c
index a704c7c340..566cbc38b3 100644
--- a/xen/arch/x86/acpi/power.c
+++ b/xen/arch/x86/acpi/power.c
@@ -33,6 +33,9 @@
uint32_t system_reset_counter = 1;
+static bool_t __read_mostly fake_s3 = 0;
+boolean_param("fake-s3", fake_s3);
+
static char __initdata opt_acpi_sleep[20];
string_param("acpi_sleep", opt_acpi_sleep);
@@ -222,7 +225,8 @@ static int enter_state(u32 state)
switch ( state )
{
case ACPI_STATE_S3:
- do_suspend_lowlevel();
+ if ( !fake_s3 )
+ do_suspend_lowlevel();
system_reset_counter++;
error = tboot_s3_resume();
break;
--
2.17.0
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