CONFIG_HYPERV_VTL_MODE: Enable Linux to boot in VTL context

General informations

The Linux kernel configuration item CONFIG_HYPERV_VTL_MODE:

• prompt: Enable Linux to boot in VTL context
• type: bool
• depends on: ( CONFIG_X86_64 && CONFIG_HYPERV ) && ( CONFIG_SMP )
• defined in drivers/hv/Kconfig
• found in Linux kernels: 6.4–6.12, 6.13-rc+HEAD

Help text

Virtual Secure Mode (VSM) is a set of hypervisor capabilities and enlightenments offered to host and guest partitions which enables the creation and management of new security boundaries within operating system software.

VSM achieves and maintains isolation through Virtual Trust Levels (VTLs). Virtual Trust Levels are hierarchical, with higher levels being more privileged than lower levels. VTL0 is the least privileged level, and currently only other level supported is VTL2.

Select this option to build a Linux kernel to run at a VTL other than the normal VTL0, which currently is only VTL2. This option initializes the x86 platform for VTL2, and adds the ability to boot secondary CPUs directly into 64-bit context as required for VTLs other than 0. A kernel built with this option must run at VTL2, and will not run as a normal guest.

If unsure, say N

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