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Subject[PATCH v2 2/2] x86: make Hyper-V support optional
Date
Make it possible to opt-out from Hyper-V support, for minimized kernels
that never will by run under Hyper-V. (eg. high-density virtualization
or embedded systems)

Average distro kernel will leave it on, therefore default to y.

Signed-off-by: Enrico Weigelt <info@metux.net>
---
arch/x86/Kconfig | 11 +++++++++++
arch/x86/kernel/cpu/Makefile | 4 ++--
arch/x86/kernel/cpu/hypervisor.c | 2 ++
drivers/hv/Kconfig | 2 +-
4 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index eff12460cb3c..57d20591d6ee 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -812,6 +812,17 @@ config VMWARE_GUEST
density virtualization or embedded systems running (para)virtualized
workloads.

+config HYPERV_GUEST
+ bool "Hyper-V Guest support"
+ default y
+ help
+ This option enables several optimizations for running under the
+ Hyper-V hypervisor.
+
+ Disabling it saves a few kb, for stripped down kernels eg. in high
+ density virtualization or embedded systems running (para)virtualized
+ workloads.
+
config KVM_GUEST
bool "KVM Guest support (including kvmclock)"
depends on PARAVIRT
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index a615b0152bf0..5536b801cb44 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -51,9 +51,9 @@ obj-$(CONFIG_X86_CPU_RESCTRL) += resctrl/

obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o

-obj-$(CONFIG_HYPERVISOR_GUEST) += hypervisor.o mshyperv.o
+obj-$(CONFIG_HYPERVISOR_GUEST) += hypervisor.o
obj-$(CONFIG_VMWARE_GUEST) += vmware.o
-
+obj-$(CONFIG_HYPERV_GUEST) += mshyperv.o
obj-$(CONFIG_ACRN_GUEST) += acrn.o

ifdef CONFIG_X86_FEATURE_NAMES
diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index c0e770a224aa..32d6b2084d05 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -37,7 +37,9 @@ static const __initconst struct hypervisor_x86 * const hypervisors[] =
#ifdef CONFIG_VMWARE_GUEST
&x86_hyper_vmware,
#endif
+#ifdef CONFIG_HYPERV_GUEST
&x86_hyper_ms_hyperv,
+#endif
#ifdef CONFIG_KVM_GUEST
&x86_hyper_kvm,
#endif
diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 79e5356a737a..7b3094c59a81 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -4,7 +4,7 @@ menu "Microsoft Hyper-V guest support"

config HYPERV
tristate "Microsoft Hyper-V client drivers"
- depends on X86 && ACPI && X86_LOCAL_APIC && HYPERVISOR_GUEST
+ depends on X86 && ACPI && X86_LOCAL_APIC && HYPERV_GUEST
select PARAVIRT
select X86_HV_CALLBACK_VECTOR
help
--
2.11.0
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