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# SPDX-License-Identifier: GPL-2.0
menu "Microsoft Hyper-V guest support"
config HYPERV
tristate "Microsoft Hyper-V client drivers"
depends on (X86 && X86_LOCAL_APIC && HYPERVISOR_GUEST) \
|| (ACPI && ARM64 && !CPU_BIG_ENDIAN)
select PARAVIRT
select X86_HV_CALLBACK_VECTOR if X86
select OF_EARLY_FLATTREE if OF
help
Select this option to run Linux as a Hyper-V client operating
system.
config HYPERV_VTL_MODE
bool "Enable Linux to boot in VTL context"
depends on X86_64 && HYPERV
default n
help
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
config HYPERV_TIMER
def_bool HYPERV && X86
config HYPERV_UTILS
tristate "Microsoft Hyper-V Utilities driver"
depends on HYPERV && CONNECTOR && NLS
depends on PTP_1588_CLOCK_OPTIONAL
help
Select this option to enable the Hyper-V Utilities.
config HYPERV_BALLOON
tristate "Microsoft Hyper-V Balloon driver"
depends on HYPERV
select PAGE_REPORTING
help
Select this option to enable Hyper-V Balloon driver.
endmenu
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