xen / ACPI / sleep: Register an acpi_suspend_lowlevel callback.
We piggyback on "x86/acpi: Provide registration for acpi_suspend_lowlevel."
to register a Xen version of the callback. The callback does not
do anything special - except it omits the x86_acpi_suspend_lowlevel.
This is necessary b/c during suspend the generic code tries to write
cr3 values that clashes with what the hypervisor has set up for the guest.
Signed-off-by: Liang Tang <liang.tang@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Ben Guthro <benjamin.guthro@citrix.com>
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/include/xen/acpi.h b/include/xen/acpi.h
index 68d73d0..46aa3d1 100644
--- a/include/xen/acpi.h
+++ b/include/xen/acpi.h
@@ -78,11 +78,25 @@
int xen_acpi_notify_hypervisor_state(u8 sleep_state,
u32 pm1a_cnt, u32 pm1b_cnd);
+static inline int xen_acpi_suspend_lowlevel(void)
+{
+ /*
+ * Xen will save and restore CPU context, so
+ * we can skip that and just go straight to
+ * the suspend.
+ */
+ acpi_enter_sleep_state(ACPI_STATE_S3);
+ return 0;
+}
+
static inline void xen_acpi_sleep_register(void)
{
- if (xen_initial_domain())
+ if (xen_initial_domain()) {
acpi_os_set_prepare_sleep(
&xen_acpi_notify_hypervisor_state);
+
+ acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel;
+ }
}
#else
static inline void xen_acpi_sleep_register(void)
