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1# SPDX-License-Identifier: GPL-2.0
2
3menu "Microsoft Hyper-V guest support"
4
5config HYPERV
6 tristate "Microsoft Hyper-V client drivers"
7 depends on (X86 && X86_LOCAL_APIC && HYPERVISOR_GUEST) \
8 || (ACPI && ARM64 && !CPU_BIG_ENDIAN)
9 select PARAVIRT
10 select X86_HV_CALLBACK_VECTOR if X86
11 select OF_EARLY_FLATTREE if OF
12 help
13 Select this option to run Linux as a Hyper-V client operating
14 system.
15
16config HYPERV_VTL_MODE
17 bool "Enable Linux to boot in VTL context"
18 depends on X86_64 && HYPERV
19 depends on SMP
20 default n
21 help
22 Virtual Secure Mode (VSM) is a set of hypervisor capabilities and
23 enlightenments offered to host and guest partitions which enables
24 the creation and management of new security boundaries within
25 operating system software.
26
27 VSM achieves and maintains isolation through Virtual Trust Levels
28 (VTLs). Virtual Trust Levels are hierarchical, with higher levels
29 being more privileged than lower levels. VTL0 is the least privileged
30 level, and currently only other level supported is VTL2.
31
32 Select this option to build a Linux kernel to run at a VTL other than
33 the normal VTL0, which currently is only VTL2. This option
34 initializes the x86 platform for VTL2, and adds the ability to boot
35 secondary CPUs directly into 64-bit context as required for VTLs other
36 than 0. A kernel built with this option must run at VTL2, and will
37 not run as a normal guest.
38
39 If unsure, say N
40
41config HYPERV_TIMER
42 def_bool HYPERV && X86
43
44config HYPERV_UTILS
45 tristate "Microsoft Hyper-V Utilities driver"
46 depends on HYPERV && CONNECTOR && NLS
47 depends on PTP_1588_CLOCK_OPTIONAL
48 help
49 Select this option to enable the Hyper-V Utilities.
50
51config HYPERV_BALLOON
52 tristate "Microsoft Hyper-V Balloon driver"
53 depends on HYPERV
54 select PAGE_REPORTING
55 help
56 Select this option to enable Hyper-V Balloon driver.
57
58config MSHV_ROOT
59 tristate "Microsoft Hyper-V root partition support"
60 depends on HYPERV && (X86_64 || ARM64)
61 depends on !HYPERV_VTL_MODE
62 # The hypervisor interface operates on 4k pages. Enforcing it here
63 # simplifies many assumptions in the root partition code.
64 # e.g. When withdrawing memory, the hypervisor gives back 4k pages in
65 # no particular order, making it impossible to reassemble larger pages
66 depends on PAGE_SIZE_4KB
67 select EVENTFD
68 default n
69 help
70 Select this option to enable support for booting and running as root
71 partition on Microsoft Hyper-V.
72
73 If unsure, say N.
74
75endmenu