[PATCH hyperv-next v6 06/11] arm64, x86: hyperv: Report the VTL the system boots in

[Roman Kisel]

The hyperv guest code might run in various Virtual Trust Levels.

Report the level when the kernel boots in the non-default (0)
one.

Signed-off-by: Roman Kisel <rom...@linux.microsoft.com>
---
 arch/arm64/hyperv/mshyperv.c | 2 ++
 arch/x86/hyperv/hv_vtl.c     | 7 ++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c
index f251a08ada5b..ecbd2f5c955e 100644
--- a/arch/arm64/hyperv/mshyperv.c
+++ b/arch/arm64/hyperv/mshyperv.c
@@ -110,6 +110,8 @@ static int __init hyperv_init(void)
        if (ms_hyperv.priv_high & HV_ACCESS_PARTITION_ID)
                hv_get_partition_id();
        ms_hyperv.vtl = get_vtl();
+       if (ms_hyperv.vtl > 0) /* non default VTL */
+               pr_info("Linux runs in Hyper-V Virtual Trust Level %d\n", 
ms_hyperv.vtl);
 
        ms_hyperv_late_init();
 
diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c
index 582fe820e29c..038c896fdd60 100644
--- a/arch/x86/hyperv/hv_vtl.c
+++ b/arch/x86/hyperv/hv_vtl.c
@@ -55,7 +55,12 @@ static void  __noreturn hv_vtl_restart(char __maybe_unused 
*cmd)
 
 void __init hv_vtl_init_platform(void)
 {
-       pr_info("Linux runs in Hyper-V Virtual Trust Level\n");
+       /*
+        * This function is a no-op if the VTL mode is not enabled.
+        * If it is, this function runs if and only the kernel boots in
+        * VTL2 which the x86 hv initialization path makes sure of.
+        */
+       pr_info("Linux runs in Hyper-V Virtual Trust Level %d\n", 
ms_hyperv.vtl);
 
        x86_platform.realmode_reserve = x86_init_noop;
        x86_platform.realmode_init = x86_init_noop;
-- 
2.43.0