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 77