diff options
| author | Roman Kisel <romank@linux.microsoft.com> | 2025-04-28 14:07:37 -0700 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2025-05-23 16:30:55 +0000 |
| commit | e956ee9491d90c4107ca6e7c4f2210d806c89f9b (patch) | |
| tree | 43d71761e446274340f7f3344f762b20226c9171 | |
| parent | 1f5538a8e2fd3602cd507897c16ee647360a0423 (diff) | |
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>
| -rw-r--r-- | arch/arm64/hyperv/mshyperv.c | 2 | ||||
| -rw-r--r-- | arch/x86/hyperv/hv_vtl.c | 7 |
2 files changed, 8 insertions, 1 deletions
diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c index 43f422a7ef34..4fdc26ade1d7 100644 --- a/arch/arm64/hyperv/mshyperv.c +++ b/arch/arm64/hyperv/mshyperv.c @@ -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(); diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c index 13242ed8ff16..ac3d27a766d5 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; |