linux-kernel - [PATCH v2 7/7] KVM: Bury kvm_{en,dis}able_virtualization() in kvm

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Message-ID: <20251206011054.494190-8-seanjc@google.com>
Date: Fri,  5 Dec 2025 17:10:54 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	Kiryl Shutsemau <kas@...nel.org>, Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev, 
	kvm@...r.kernel.org, Chao Gao <chao.gao@...el.com>, 
	Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH v2 7/7] KVM: Bury kvm_{en,dis}able_virtualization() in
 kvm_main.c once more

Now that TDX handles doing VMXON without KVM's involvement, bury the
top-level APIs to enable and disable virtualization back in kvm_main.c.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 include/linux/kvm_host.h |  8 --------
 virt/kvm/kvm_main.c      | 17 +++++++++++++----
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index a453fe6ce05a..ac9332104793 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2596,12 +2596,4 @@ long kvm_arch_vcpu_pre_fault_memory(struct kvm_vcpu *vcpu,
 				    struct kvm_pre_fault_memory *range);
 #endif
 
-#ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
-int kvm_enable_virtualization(void);
-void kvm_disable_virtualization(void);
-#else
-static inline int kvm_enable_virtualization(void) { return 0; }
-static inline void kvm_disable_virtualization(void) { }
-#endif
-
 #endif
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 3278ee9381bd..ac2633e9cd80 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1111,6 +1111,9 @@ static inline struct kvm_io_bus *kvm_get_bus_for_destruction(struct kvm *kvm,
 					 !refcount_read(&kvm->users_count));
 }
 
+static int kvm_enable_virtualization(void);
+static void kvm_disable_virtualization(void);
+
 static struct kvm *kvm_create_vm(unsigned long type, const char *fdname)
 {
 	struct kvm *kvm = kvm_arch_alloc_vm();
@@ -5693,7 +5696,7 @@ static struct syscore_ops kvm_syscore_ops = {
 	.shutdown = kvm_shutdown,
 };
 
-int kvm_enable_virtualization(void)
+static int kvm_enable_virtualization(void)
 {
 	int r;
 
@@ -5738,9 +5741,8 @@ int kvm_enable_virtualization(void)
 	--kvm_usage_count;
 	return r;
 }
-EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_enable_virtualization);
 
-void kvm_disable_virtualization(void)
+static void kvm_disable_virtualization(void)
 {
 	guard(mutex)(&kvm_usage_lock);
 
@@ -5751,7 +5753,6 @@ void kvm_disable_virtualization(void)
 	cpuhp_remove_state(CPUHP_AP_KVM_ONLINE);
 	kvm_arch_disable_virtualization();
 }
-EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_disable_virtualization);
 
 static int kvm_init_virtualization(void)
 {
@@ -5767,6 +5768,14 @@ static void kvm_uninit_virtualization(void)
 		kvm_disable_virtualization();
 }
 #else /* CONFIG_KVM_GENERIC_HARDWARE_ENABLING */
+static int kvm_enable_virtualization(void)
+{
+	return 0;
+}
+static void kvm_disable_virtualization(void)
+{
+
+}
 static int kvm_init_virtualization(void)
 {
 	return 0;
-- 
2.52.0.223.gf5cc29aaa4-goog