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From: "Enrico Weigelt, metux IT consult" <info@metux.net>
To: linux-kernel@vger.kernel.org
Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	x86@kernel.org, hpa@zytor.com, dmitry.torokhov@gmail.com,
	derek.kiernan@xilinx.com, dragan.cvetic@xilinx.com,
	richardcochran@gmail.com, linux-hyperv@vger.kernel.org,
	linux-input@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH v2 2/2] x86: make Hyper-V support optional
Date: Wed,  2 Dec 2020 22:19:49 +0100	[thread overview]
Message-ID: <20201202211949.17730-2-info@metux.net> (raw)
In-Reply-To: <20201202211949.17730-1-info@metux.net>

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


  reply	other threads:[~2020-12-02 21:23 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-02 21:19 [PATCH v2 1/2] x86: make VMware " Enrico Weigelt, metux IT consult
2020-12-02 21:19 ` Enrico Weigelt, metux IT consult [this message]
2020-12-02 21:58   ` [PATCH v2 2/2] x86: make Hyper-V " Randy Dunlap
2020-12-02 21:59 ` [PATCH v2 1/2] x86: make VMware " Randy Dunlap
2020-12-03  7:46 ` Borislav Petkov

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