linux-kernel - [RFC PATCH 14/18] KVM: Eliminate kvm_arch_post_init

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Message-Id: <efde8ff8e65bb396363dce6a27de2bf4789ad617.1660974106.git.isaku.yamahata@intel.com>
Date:   Fri, 19 Aug 2022 23:00:20 -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 14/18] KVM: Eliminate kvm_arch_post_init_vm()

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

Now kvm_arch_post_init_vm() is used only by x86 kvm_arch_add_vm().  Other
arch doesn't define it. Merge x86 kvm_arch_post_init_vm() int x86
kvm_arch_add_vm() and eliminate kvm_arch_post_init_vm().

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/x86.c       |  7 +------
 include/linux/kvm_host.h |  1 -
 virt/kvm/kvm_arch.c      | 12 +-----------
 3 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 71e90d0f0da9..a1e8d15aa6b8 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11843,11 +11843,6 @@ void kvm_arch_hardware_disable(void)
 
 static cpumask_t cpus_hardware_enabled = CPU_MASK_NONE;
 
-int kvm_arch_post_init_vm(struct kvm *kvm)
-{
-	return kvm_mmu_post_init_vm(kvm);
-}
-
 static int __hardware_enable(void)
 {
 	int cpu = raw_smp_processor_id();
@@ -11910,7 +11905,7 @@ int kvm_arch_add_vm(struct kvm *kvm, int usage_count)
 		goto err;
 	}
 
-	r = kvm_arch_post_init_vm(kvm);
+	r = kvm_mmu_post_init_vm(kvm);
 err:
 	if (r && usage_count == 1)
 		on_each_cpu(hardware_disable, NULL, 1);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 9584500eb4fa..7983744addbf 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1445,7 +1445,6 @@ bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
 bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu);
 bool kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu);
-int kvm_arch_post_init_vm(struct kvm *kvm);
 int kvm_arch_add_vm(struct kvm *kvm, int usage_count);
 int kvm_arch_del_vm(int usage_count);
 void kvm_arch_pre_destroy_vm(struct kvm *kvm);
diff --git a/virt/kvm/kvm_arch.c b/virt/kvm/kvm_arch.c
index 20971f43df95..94dd57bbc8bd 100644
--- a/virt/kvm/kvm_arch.c
+++ b/virt/kvm/kvm_arch.c
@@ -14,11 +14,6 @@
 
 static cpumask_t cpus_hardware_enabled = CPU_MASK_NONE;
 
-__weak int kvm_arch_post_init_vm(struct kvm *kvm)
-{
-	return 0;
-}
-
 static int __hardware_enable(void)
 {
 	int cpu = raw_smp_processor_id();
@@ -78,13 +73,8 @@ __weak int kvm_arch_add_vm(struct kvm *kvm, int usage_count)
 
 	if (atomic_read(&failed)) {
 		r = -EBUSY;
-		goto err;
-	}
-
-	r = kvm_arch_post_init_vm(kvm);
-err:
-	if (r)
 		on_each_cpu(hardware_disable, NULL, 1);
+	}
 	return r;
 }
 
-- 
2.25.1