mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
7b89a44b2e
Commit96959283a5("Drivers: hv: Always select CONFIG_SYSFB for Hyper-V guests") selects CONFIG_SYSFB for Hyper-V guests so that screen_info is available to the VMBus driver to get the location of the framebuffer in Generation 2 VMs. However, if CONFIG_HYPERV is enabled but CONFIG_EFI is not, a kernel link error results in ARM64 builds because screen_info is provided by the EFI firmware interface. While configuring an ARM64 Hyper-V guest without EFI isn't useful since EFI is required to boot, the configuration is still possible and the link error should be prevented. Fix this by making the selection of CONFIG_SYSFB conditional on CONFIG_EFI being defined. For Generation 1 VMs on x86/x64, which don't use EFI, the additional condition is OK because such VMs get the framebuffer information via a mechanism that doesn't use screen_info. Fixes:96959283a5("Drivers: hv: Always select CONFIG_SYSFB for Hyper-V guests") Reported-by: Arnd Bergmann <arnd@arndb.de> Closes: https://lore.kernel.org/linux-hyperv/20250610091810.2638058-1-arnd@kernel.org/ Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202506080820.1wmkQufc-lkp@intel.com/ Signed-off-by: Michael Kelley <mhklinux@outlook.com> Link: https://lore.kernel.org/stable/20250613230059.380483-1-mhklinux%40outlook.com Reviewed-by: Roman Kisel <romank@linux.microsoft.com> Link: https://lore.kernel.org/r/20250613230059.380483-1-mhklinux@outlook.com Signed-off-by: Wei Liu <wei.liu@kernel.org> Message-ID: <20250613230059.380483-1-mhklinux@outlook.com>
76 lines
2.5 KiB
Text
76 lines
2.5 KiB
Text
# 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) \
|
|
|| (ARM64 && !CPU_BIG_ENDIAN)
|
|
select PARAVIRT
|
|
select X86_HV_CALLBACK_VECTOR if X86
|
|
select OF_EARLY_FLATTREE if OF
|
|
select SYSFB if EFI && !HYPERV_VTL_MODE
|
|
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 || ARM64) && HYPERV
|
|
depends on SMP
|
|
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 kernel to run in 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.
|
|
|
|
config MSHV_ROOT
|
|
tristate "Microsoft Hyper-V root partition support"
|
|
depends on HYPERV && (X86_64 || ARM64)
|
|
depends on !HYPERV_VTL_MODE
|
|
# The hypervisor interface operates on 4k pages. Enforcing it here
|
|
# simplifies many assumptions in the root partition code.
|
|
# e.g. When withdrawing memory, the hypervisor gives back 4k pages in
|
|
# no particular order, making it impossible to reassemble larger pages
|
|
depends on PAGE_SIZE_4KB
|
|
select EVENTFD
|
|
default n
|
|
help
|
|
Select this option to enable support for booting and running as root
|
|
partition on Microsoft Hyper-V.
|
|
|
|
If unsure, say N.
|
|
|
|
endmenu
|