linux-kernel - [PATCH v4 21/26] KVM: x86: Delete kvm_arch_hardware

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Date:   Thu,  8 Sep 2022 16:25:37 -0700
From:   isaku.yamahata@...el.com
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        Yuan Yao <yuan.yao@...ux.intel.com>
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Kai Huang <kai.huang@...el.com>, Chao Gao <chao.gao@...el.com>,
        Atish Patra <atishp@...shpatra.org>,
        Shaokun Zhang <zhangshaokun@...ilicon.com>,
        Qi Liu <liuqi115@...wei.com>,
        John Garry <john.garry@...wei.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Huang Ying <ying.huang@...el.com>,
        Huacai Chen <chenhuacai@...nel.org>
Subject: [PATCH v4 21/26] KVM: x86: Delete kvm_arch_hardware_enable/disable()

From: Isaku Yamahata <isaku.yamahata@...el.com>

Now they're function call and there is no point to keep them.
Opportunistically make kvm_arch_pre_hardware_unsetup() empty.

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/x86.c       | 27 +++++++--------------------
 include/linux/kvm_host.h |  6 ++++--
 2 files changed, 11 insertions(+), 22 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6dcc6ed90421..0c9d965859c6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -354,7 +354,7 @@ static void kvm_on_user_return(struct user_return_notifier *urn)
 
 	/*
 	 * Disabling irqs at this point since the following code could be
-	 * interrupted and executed through kvm_arch_hardware_disable()
+	 * interrupted and executed through hardware_disable()
 	 */
 	local_irq_save(flags);
 	if (msrs->registered) {
@@ -11834,17 +11834,6 @@ 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)
-{
-	return static_call(kvm_x86_hardware_enable)();
-}
-
-void kvm_arch_hardware_disable(void)
-{
-	static_call(kvm_x86_hardware_disable)();
-	drop_user_return_notifiers();
-}
-
 static cpumask_t cpus_hardware_enabled = CPU_MASK_NONE;
 
 static int __hardware_enable(void *caller_name)
@@ -11856,7 +11845,7 @@ static int __hardware_enable(void *caller_name)
 
 	if (cpumask_test_cpu(cpu, &cpus_hardware_enabled))
 		return 0;
-	r = kvm_arch_hardware_enable();
+	r = static_call(kvm_x86_hardware_enable)();
 	if (r)
 		pr_warn("kvm: enabling virtualization on CPU%d failed during %s()\n",
 			cpu, (const char *)caller_name);
@@ -11882,12 +11871,8 @@ static void hardware_disable(void *junk)
 	if (!cpumask_test_cpu(cpu, &cpus_hardware_enabled))
 		return;
 	cpumask_clear_cpu(cpu, &cpus_hardware_enabled);
-	kvm_arch_hardware_disable();
-}
-
-void kvm_arch_pre_hardware_unsetup(void)
-{
-	on_each_cpu(hardware_disable, NULL, 1);
+	static_call(kvm_x86_hardware_disable)();
+	drop_user_return_notifiers();
 }
 
 /*
@@ -12019,7 +12004,7 @@ void kvm_arch_resume(int usage_count)
 		return;
 
 	preempt_disable();
-	if (kvm_arch_hardware_enable()) {
+	if (static_call(kvm_x86_hardware_enable)()) {
 		preempt_enable();
 		return;
 	}
@@ -12163,6 +12148,8 @@ int kvm_arch_hardware_setup(void *opaque)
 
 void kvm_arch_hardware_unsetup(void)
 {
+	on_each_cpu(hardware_disable, NULL, 1);
+
 	kvm_unregister_perf_callbacks();
 
 	static_call(kvm_x86_hardware_unsetup)();
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f538fc3356a9..5f4d6f641b03 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1434,13 +1434,15 @@ void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_
 static inline void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) {}
 #endif
 
-#ifndef CONFIG_HAVE_KVM_OVERRIDE_HARDWARE_ENABLE
+#ifdef CONFIG_HAVE_KVM_OVERRIDE_HARDWARE_ENABLE
+static inline void kvm_arch_pre_hardware_unsetup(void) {}
+#else
+void kvm_arch_pre_hardware_unsetup(void);
 int kvm_arch_hardware_enable(void);
 void kvm_arch_hardware_disable(void);
 #endif
 
 int kvm_arch_hardware_setup(void *opaque);
-void kvm_arch_pre_hardware_unsetup(void);
 void kvm_arch_hardware_unsetup(void);
 int kvm_arch_check_processor_compat(void);
 int kvm_arch_check_processor_compat_all(void);
-- 
2.25.1