linux-kernel - [RFC PATCH 15/18] KVM: x86: Delete kvm_arch_hardware

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Date:   Fri, 19 Aug 2022 23:00:21 -0700
From:   isaku.yamahata@...el.com
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kai Huang <kai.huang@...el.com>, Chao Gao <chao.gao@...el.com>,
        Will Deacon <will@...nel.org>
Subject: [RFC PATCH 15/18] 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 | 24 ++++++++----------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a1e8d15aa6b8..5aa6d5308ee8 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) {
@@ -11830,17 +11830,6 @@ 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)
@@ -11852,7 +11841,7 @@ static int __hardware_enable(void)
 
 	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_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
 	else
@@ -11877,12 +11866,13 @@ 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();
+	static_call(kvm_x86_hardware_disable)();
+	drop_user_return_notifiers();
 }
 
 void kvm_arch_pre_hardware_unsetup(void)
 {
-	on_each_cpu(hardware_disable, NULL, 1);
+	/* TODO: eliminate this function */
 }
 
 /*
@@ -11968,7 +11958,7 @@ void kvm_arch_resume(int usage_count)
 
 	if (kvm_arch_check_processor_compat())
 		return;
-	if (kvm_arch_hardware_enable())
+	if (static_call(kvm_x86_hardware_enable)())
 		return;
 
 	local_tsc = rdtsc();
@@ -12109,6 +12099,8 @@ 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)();
-- 
2.25.1