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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 || (ARM64 && !CPU_BIG_ENDIAN)
9 select PARAVIRT
10 select X86_HV_CALLBACK_VECTOR if X86
11 select OF_EARLY_FLATTREE if OF
12 select SYSFB if EFI && !HYPERV_VTL_MODE
13 help
14 Select this option to run Linux as a Hyper-V client operating
15 system.
16
17config HYPERV_VTL_MODE
18 bool "Enable Linux to boot in VTL context"
19 depends on (X86_64 || ARM64) && HYPERV
20 depends on SMP
21 default n
22 help
23 Virtual Secure Mode (VSM) is a set of hypervisor capabilities and
24 enlightenments offered to host and guest partitions which enables
25 the creation and management of new security boundaries within
26 operating system software.
27
28 VSM achieves and maintains isolation through Virtual Trust Levels
29 (VTLs). Virtual Trust Levels are hierarchical, with higher levels
30 being more privileged than lower levels. VTL0 is the least privileged
31 level, and currently only other level supported is VTL2.
32
33 Select this option to build a Linux kernel to run at a VTL other than
34 the normal VTL0, which currently is only VTL2. This option
35 initializes the kernel to run in VTL2, and adds the ability to boot
36 secondary CPUs directly into 64-bit context as required for VTLs other
37 than 0. A kernel built with this option must run at VTL2, and will
38 not run as a normal guest.
39
40 If unsure, say N
41
42config HYPERV_TIMER
43 def_bool HYPERV && X86
44
45config HYPERV_UTILS
46 tristate "Microsoft Hyper-V Utilities driver"
47 depends on HYPERV && CONNECTOR && NLS
48 depends on PTP_1588_CLOCK_OPTIONAL
49 help
50 Select this option to enable the Hyper-V Utilities.
51
52config HYPERV_BALLOON
53 tristate "Microsoft Hyper-V Balloon driver"
54 depends on HYPERV
55 select PAGE_REPORTING
56 help
57 Select this option to enable Hyper-V Balloon driver.
58
59config MSHV_ROOT
60 tristate "Microsoft Hyper-V root partition support"
61 depends on HYPERV && (X86_64 || ARM64)
62 depends on !HYPERV_VTL_MODE
63 # The hypervisor interface operates on 4k pages. Enforcing it here
64 # simplifies many assumptions in the root partition code.
65 # e.g. When withdrawing memory, the hypervisor gives back 4k pages in
66 # no particular order, making it impossible to reassemble larger pages
67 depends on PAGE_SIZE_4KB
68 select EVENTFD
69 default n
70 help
71 Select this option to enable support for booting and running as root
72 partition on Microsoft Hyper-V.
73
74 If unsure, say N.
75
76endmenu