KVM: Drop kvm_arch_{init,exit}() hooks

Drop kvm_arch_init() and kvm_arch_exit() now that all implementations
are nops.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>	# s390
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Anup Patel <anup@brainfault.org>
Message-Id: <20221130230934.1014142-30-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

9 files changed, 2 insertions, 76 deletions

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index ea8057fa113f..04ed741f7b9d 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -2301,17 +2301,6 @@ out_err:
 	return err;
 }
 
-int kvm_arch_init(void *opaque)
-{
-	return 0;
-}
-
-/* NOP: Compiling as a module not supported */
-void kvm_arch_exit(void)
-{
-
-}
-
 static int __init early_kvm_mode_cfg(char *arg)
 {
 	if (!arg)
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index ae7a24342fdf..3cade648827a 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -1010,16 +1010,6 @@ long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 	return r;
 }
 
-int kvm_arch_init(void *opaque)
-{
-	return 0;
-}
-
-void kvm_arch_exit(void)
-{
-
-}
-
 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 				  struct kvm_sregs *sregs)
 {
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 5d2c3a487e73..0a80e80c7b9e 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -881,7 +881,6 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
 static inline void kvm_arch_flush_shadow_all(struct kvm *kvm) {}
 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
-static inline void kvm_arch_exit(void) {}
 static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
 static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
 
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index d44b85ba8cef..01d0f9935e6c 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -2539,11 +2539,6 @@ void kvmppc_init_lpid(unsigned long nr_lpids_param)
 }
 EXPORT_SYMBOL_GPL(kvmppc_init_lpid);
 
-int kvm_arch_init(void *opaque)
-{
-	return 0;
-}
-
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ppc_instr);
 
 void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry)
diff --git a/arch/riscv/kvm/main.c b/arch/riscv/kvm/main.c
index 1cd220e96c26..be951feee27a 100644
--- a/arch/riscv/kvm/main.c
+++ b/arch/riscv/kvm/main.c
@@ -65,15 +65,6 @@ void kvm_arch_hardware_disable(void)
 	csr_write(CSR_HIDELEG, 0);
 }
 
-int kvm_arch_init(void *opaque)
-{
-	return 0;
-}
-
-void kvm_arch_exit(void)
-{
-}
-
 static int __init riscv_kvm_init(void)
 {
 	const char *str;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 66d162723d21..25b08b956888 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -541,16 +541,6 @@ static void __kvm_s390_exit(void)
 	debug_unregister(kvm_s390_dbf_uv);
 }
 
-int kvm_arch_init(void *opaque)
-{
-	return 0;
-}
-
-void kvm_arch_exit(void)
-{
-
-}
-
 /* Section: device related */
 long kvm_arch_dev_ioctl(struct file *filp,
 			unsigned int ioctl, unsigned long arg)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 78cb6a46dd50..accf5a7ab8df 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9292,16 +9292,6 @@ static inline void kvm_ops_update(struct kvm_x86_init_ops *ops)
 	kvm_pmu_ops_update(ops->pmu_ops);
 }
 
-int kvm_arch_init(void *opaque)
-{
-	return 0;
-}
-
-void kvm_arch_exit(void)
-{
-
-}
-
 static int __kvm_x86_vendor_init(struct kvm_x86_init_ops *ops)
 {
 	u64 host_pat;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 7c1009c0e66d..62d977bb1448 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1423,9 +1423,6 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 					struct kvm_guest_debug *dbg);
 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu);
 
-int kvm_arch_init(void *opaque);
-void kvm_arch_exit(void);
-
 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
 
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8393347fd35f..597ff734b312 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -5921,20 +5921,8 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 	int r;
 	int cpu;
 
-	/*
-	 * FIXME: Get rid of kvm_arch_init(), vendor code should call arch code
-	 * directly.  Note, kvm_arch_init() _must_ be called before anything
-	 * else as x86 relies on checks buried in kvm_arch_init() to guard
-	 * against multiple calls to kvm_init().
-	 */
-	r = kvm_arch_init(opaque);
-	if (r)
-		return r;
-
-	if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
-		r = -ENOMEM;
-		goto err_hw_enabled;
-	}
+	if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL))
+		return -ENOMEM;
 
 	c.ret = &r;
 	c.opaque = opaque;
@@ -6022,8 +6010,6 @@ out_free_3:
 	cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
 out_free_2:
 	free_cpumask_var(cpus_hardware_enabled);
-err_hw_enabled:
-	kvm_arch_exit();
 	return r;
 }
 EXPORT_SYMBOL_GPL(kvm_init);
@@ -6051,7 +6037,6 @@ void kvm_exit(void)
 	on_each_cpu(hardware_disable_nolock, NULL, 1);
 	kvm_irqfd_exit();
 	free_cpumask_var(cpus_hardware_enabled);
-	kvm_arch_exit();
 }
 EXPORT_SYMBOL_GPL(kvm_exit);