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Subject[PATCH v5 24/30] KVM: Add config to not compile kvm_arch.c
Date
From: Isaku Yamahata <isaku.yamahata@intel.com>

So that kvm_arch_hardware_enable/disable() aren't required.

Once the conversion of all KVM archs is done, this config and kvm_arch.c
should be removed.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/Kconfig | 1 +
arch/x86/kvm/x86.c | 4 ++--
include/linux/kvm_host.h | 3 +++
virt/kvm/Kconfig | 3 +++
virt/kvm/Makefile.kvm | 5 ++++-
5 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index e3cbd7706136..e2e16205425d 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -25,6 +25,7 @@ config KVM
depends on X86_LOCAL_APIC
select PREEMPT_NOTIFIERS
select MMU_NOTIFIER
+ select HAVE_KVM_OVERRIDE_HARDWARE_ENABLE
select HAVE_KVM_IRQCHIP
select HAVE_KVM_PFNCACHE
select HAVE_KVM_IRQFD
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bf8d3b901725..01687b553915 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11864,7 +11864,7 @@ void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
}
EXPORT_SYMBOL_GPL(kvm_vcpu_deliver_sipi_vector);

-int kvm_arch_hardware_enable(void)
+static int kvm_arch_hardware_enable(void)
{
return static_call(kvm_x86_hardware_enable)();
}
@@ -11961,7 +11961,7 @@ void kvm_arch_resume(int usage_count)
}
}

-void kvm_arch_hardware_disable(void)
+static void kvm_arch_hardware_disable(void)
{
static_call(kvm_x86_hardware_disable)();
drop_user_return_notifiers();
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 8dfa212b4543..7efc4792ff5f 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1440,8 +1440,11 @@ int kvm_arch_reboot(int val);
int kvm_arch_suspend(int usage_count);
void kvm_arch_resume(int usage_count);

+#ifndef CONFIG_HAVE_KVM_OVERRIDE_HARDWARE_ENABLE
int kvm_arch_hardware_enable(void);
void kvm_arch_hardware_disable(void);
+#endif
+
int kvm_arch_hardware_setup(void *opaque);
void kvm_arch_hardware_unsetup(void);
int kvm_arch_check_processor_compat(void);
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index a8c5c9f06b3c..917314a87696 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -72,3 +72,6 @@ config KVM_XFER_TO_GUEST_WORK

config HAVE_KVM_PM_NOTIFIER
bool
+
+config HAVE_KVM_OVERRIDE_HARDWARE_ENABLE
+ def_bool n
diff --git a/virt/kvm/Makefile.kvm b/virt/kvm/Makefile.kvm
index 428b09b3f80a..c0187ec4f83c 100644
--- a/virt/kvm/Makefile.kvm
+++ b/virt/kvm/Makefile.kvm
@@ -5,7 +5,10 @@

KVM ?= ../../../virt/kvm

-kvm-y := $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/binary_stats.o $(KVM)/kvm_arch.o
+kvm-y := $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/binary_stats.o
+ifneq ($(CONFIG_HAVE_KVM_OVERRIDE_HARDWARE_ENABLE), y)
+kvm-y += $(KVM)/kvm_arch.o
+endif
kvm-$(CONFIG_KVM_VFIO) += $(KVM)/vfio.o
kvm-$(CONFIG_KVM_MMIO) += $(KVM)/coalesced_mmio.o
kvm-$(CONFIG_KVM_ASYNC_PF) += $(KVM)/async_pf.o
--
2.25.1
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