To run in the VTL mode, Hyper-V drivers have to know what
VTL the system boots in, and the arm64/hyperv code does not
update the variable that stores the value.
Update the variable to enable the Hyper-V drivers to boot
in the VTL mode and print the VTL the code runs in.
Signed-off-by: Roman Kisel <romank@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/hyperv/Makefile | 1 +
arch/arm64/hyperv/hv_vtl.c | 13 +++++++++++++
arch/arm64/hyperv/mshyperv.c | 4 ++++
arch/arm64/include/asm/mshyperv.h | 7 +++++++
4 files changed, 25 insertions(+)
create mode 100644 arch/arm64/hyperv/hv_vtl.c
diff --git a/arch/arm64/hyperv/Makefile b/arch/arm64/hyperv/Makefile
index 87c31c001da9..9701a837a6e1 100644
--- a/arch/arm64/hyperv/Makefile
+++ b/arch/arm64/hyperv/Makefile
@@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
obj-y := hv_core.o mshyperv.o
+obj-$(CONFIG_HYPERV_VTL_MODE) += hv_vtl.o
diff --git a/arch/arm64/hyperv/hv_vtl.c b/arch/arm64/hyperv/hv_vtl.c
new file mode 100644
index 000000000000..38642b7b6be0
--- /dev/null
+++ b/arch/arm64/hyperv/hv_vtl.c
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2024, Microsoft, Inc.
+ *
+ * Author : Roman Kisel <romank@xxxxxxxxxxxxxxxxxxx>
+ */
+
+#include <asm/mshyperv.h>
+
+void __init hv_vtl_init_platform(void)
+{
+ pr_info("Linux runs in Hyper-V Virtual Trust Level\n");
+}
diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c
index 341f98312667..8fd04d6e4800 100644
--- a/arch/arm64/hyperv/mshyperv.c
+++ b/arch/arm64/hyperv/mshyperv.c
@@ -98,6 +98,10 @@ static int __init hyperv_init(void)
return ret;
}
+ /* Find the VTL */
+ ms_hyperv.vtl = get_vtl();
+ hv_vtl_init_platform();
+
ms_hyperv_late_init();
hyperv_initialized = true;
diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h
index a7a3586f7cb1..63d6bb6998fc 100644
--- a/arch/arm64/include/asm/mshyperv.h
+++ b/arch/arm64/include/asm/mshyperv.h
@@ -49,6 +49,13 @@ static inline u64 hv_get_msr(unsigned int reg)
ARM_SMCCC_OWNER_VENDOR_HYP, \
HV_SMCCC_FUNC_NUMBER)
+#ifdef CONFIG_HYPERV_VTL_MODE
+void __init hv_vtl_init_platform(void);
+int __init hv_vtl_early_init(void);
+#else
+static inline void __init hv_vtl_init_platform(void) {}
+#endif
+
#include <asm-generic/mshyperv.h>
#define ARM_SMCCC_VENDOR_HYP_UID_HYPERV_REG_0 0x7948734d
--
2.34.1
