linux-kernel - [PATCH hyperv-next v5 06/11] arm64, x86: hyperv: Report the VTL the system boots in

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250307220304.247725-7-romank@linux.microsoft.com>
Date: Fri,  7 Mar 2025 14:02:58 -0800
From: Roman Kisel <romank@...ux.microsoft.com>
To: arnd@...db.de,
	bhelgaas@...gle.com,
	bp@...en8.de,
	catalin.marinas@....com,
	conor+dt@...nel.org,
	dave.hansen@...ux.intel.com,
	decui@...rosoft.com,
	haiyangz@...rosoft.com,
	hpa@...or.com,
	joey.gouly@....com,
	krzk+dt@...nel.org,
	kw@...ux.com,
	kys@...rosoft.com,
	lenb@...nel.org,
	lpieralisi@...nel.org,
	manivannan.sadhasivam@...aro.org,
	mark.rutland@....com,
	maz@...nel.org,
	mingo@...hat.com,
	oliver.upton@...ux.dev,
	rafael@...nel.org,
	robh@...nel.org,
	ssengar@...ux.microsoft.com,
	sudeep.holla@....com,
	suzuki.poulose@....com,
	tglx@...utronix.de,
	wei.liu@...nel.org,
	will@...nel.org,
	yuzenghui@...wei.com,
	devicetree@...r.kernel.org,
	kvmarm@...ts.linux.dev,
	linux-acpi@...r.kernel.org,
	linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	x86@...nel.org
Cc: apais@...rosoft.com,
	benhill@...rosoft.com,
	bperkins@...rosoft.com,
	sunilmut@...rosoft.com
Subject: [PATCH hyperv-next v5 06/11] 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@...ux.microsoft.com>
---
 arch/arm64/hyperv/mshyperv.c | 2 ++
 arch/x86/hyperv/hv_vtl.c     | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c
index a7db03f5413d..3bc16dbee758 100644
--- a/arch/arm64/hyperv/mshyperv.c
+++ b/arch/arm64/hyperv/mshyperv.c
@@ -108,6 +108,8 @@ 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 4e1b1e3b5658..c21bee7e8ff3 100644
--- a/arch/x86/hyperv/hv_vtl.c
+++ b/arch/x86/hyperv/hv_vtl.c
@@ -24,7 +24,7 @@ static bool __init hv_vtl_msi_ext_dest_id(void)
 
 void __init hv_vtl_init_platform(void)
 {
-	pr_info("Linux runs in Hyper-V Virtual Trust Level\n");
+	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