[Skiboot] [RFC 8/8] mowgli: (EXAMPLE) enable mode-switchable drivers for secvar

[Eric Richter]

This example patch enables the new mode-switchable secvar drivers for the
mowgli platform.

RFC NOTE: This is a patch that should likely be carried out-of-tree for
platforms that decide to use these switchable drivers. As this will depend
on having default variables compiled it, there should likely be some
compile-time check to confirm default keys are in use, or some runtime
check to force USER_MODE if no built-in keys are provided.

I am slightly in favor of the latter option, so that it is easier for
users of platforms supported by secvar to enable switchable modes by only
needing to supply default variable data.
---
 platforms/astbmc/mowgli.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/platforms/astbmc/mowgli.c b/platforms/astbmc/mowgli.c
index df83319d..8b0686b6 100644
--- a/platforms/astbmc/mowgli.c
+++ b/platforms/astbmc/mowgli.c
@@ -84,7 +84,9 @@ static bool mowgli_probe(void)
 }
 static int mowgli_secvar_init(void)
 {
-	return secvar_main(secboot_tpm_driver, edk2_compatible_v1);
+	// TODO: Provide a compile-time check to make sure there actually are static keys?
+	//  have switchable mode only in the presence of a mode to switch to
+	return secvar_main(secboot_tpm_switchable_driver, edk2_switchable_driver);
 }
 
 
-- 
2.33.0