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arm64, x86: hyperv: Report the VTL the system boots in 

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 <romank@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/20250428210742.435282-7-romank@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250428210742.435282-7-romank@linux.microsoft.com>
pull/1285/head
Roman Kisel 2025-04-28 14:07:37 -07:00 committed by Wei Liu
parent 1f5538a8e2
commit e956ee9491
2 changed files with 8 additions and 1 deletions
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2
arch/arm64/hyperv/mshyperv.c
View File

@ -118,6 +118,8 @@ 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();

7
arch/x86/hyperv/hv_vtl.c
View File

@ -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;