On Mon, Jan 18, 2016 at 05:45:24PM +0000, Stefano Stabellini wrote:

On Mon, 18 Jan 2016, Mark Rutland wrote:

quoted

On Fri, Jan 15, 2016 at 02:55:29PM +0800, Shannon Zhao wrote:

quoted

+void __init xen_efi_runtime_setup(void)
+{
+	efi.get_time                 = xen_efi_get_time;
+	efi.set_time                 = xen_efi_set_time;
+	efi.get_wakeup_time          = xen_efi_get_wakeup_time;
+	efi.set_wakeup_time          = xen_efi_set_wakeup_time;
+	efi.get_variable             = xen_efi_get_variable;
+	efi.get_next_variable        = xen_efi_get_next_variable;
+	efi.set_variable             = xen_efi_set_variable;
+	efi.query_variable_info      = xen_efi_query_variable_info;
+	efi.update_capsule           = xen_efi_update_capsule;
+	efi.query_capsule_caps       = xen_efi_query_capsule_caps;
+	efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
+	efi.reset_system             = NULL;
+}

How do capsules work in the absence of an EFI system reset?

Actually I don't think that capsules are available in Xen on ARM64 yet,
see "TODO - disabled until implemented on ARM" in
xen/common/efi/runtime.c.

FYI system reset is available, but it is provided via a different
mechanism (HYPERVISOR_sched_op(xen_restart...)

Will that trigger Xen to do the right thing to trigger capsule updates
when implemented in Xen? Or do we need a xen_efi_reset_system?

Does that override PSCI?

In machine_restart we try efi_reboot first specifically to allow for
capsule updates. Similarly drivers/firmware/efi/reboot.c registers
efi_power_off late in order to override anything else, though that's
best-effort at present.

Thanks,
Mark.