[PATCH v2 1/9] KVM: Pass kvm_init()'s opaque param to additional arch funcs

[Sean Christopherson <sean.j.christopherson@xxxxxxxxx>]

Pass @opaque to kvm_arch_hardware_setup() and
kvm_arch_check_processor_compat() to allow architecture specific code to
reference @opaque without having to stash it away in a temporary global
variable.  This will enable x86 to separate its vendor specific callback
ops, which are passed via @opaque, into "init" and "runtime" ops without
having to stash away the "init" ops.

No functional change intended.

Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
Tested-by: Cornelia Huck <cohuck@xxxxxxxxxx> #s390
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
 arch/mips/kvm/mips.c       |  4 ++--
 arch/powerpc/kvm/powerpc.c |  4 ++--
 arch/s390/kvm/kvm-s390.c   |  4 ++--
 arch/x86/kvm/x86.c         |  4 ++--
 include/linux/kvm_host.h   |  4 ++--
 virt/kvm/arm/arm.c         |  4 ++--
 virt/kvm/kvm_main.c        | 18 ++++++++++++++----
 7 files changed, 26 insertions(+), 16 deletions(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 71244bf87c3a..68e27ce8bbba 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -118,12 +118,12 @@ void kvm_arch_hardware_disable(void)
 	kvm_mips_callbacks->hardware_disable();
 }
 
-int kvm_arch_hardware_setup(void)
+int kvm_arch_hardware_setup(void *opaque)
 {
 	return 0;
 }
 
-int kvm_arch_check_processor_compat(void)
+int kvm_arch_check_processor_compat(void *opaque)
 {
 	return 0;
 }
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 1af96fb5dc6f..ffa9d0ac5390 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -416,12 +416,12 @@ int kvm_arch_hardware_enable(void)
 	return 0;
 }
 
-int kvm_arch_hardware_setup(void)
+int kvm_arch_hardware_setup(void *opaque)
 {
 	return 0;
 }
 
-int kvm_arch_check_processor_compat(void)
+int kvm_arch_check_processor_compat(void *opaque)
 {
 	return kvmppc_core_check_processor_compat();
 }
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index d7ff30e45589..5cae22b56ddd 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -228,7 +228,7 @@ int kvm_arch_hardware_enable(void)
 	return 0;
 }
 
-int kvm_arch_check_processor_compat(void)
+int kvm_arch_check_processor_compat(void *opaque)
 {
 	return 0;
 }
@@ -293,7 +293,7 @@ static struct notifier_block kvm_clock_notifier = {
 	.notifier_call = kvm_clock_sync,
 };
 
-int kvm_arch_hardware_setup(void)
+int kvm_arch_hardware_setup(void *opaque)
 {
 	gmap_notifier.notifier_call = kvm_gmap_notifier;
 	gmap_register_pte_notifier(&gmap_notifier);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fbabb2f06273..bdd0a613b374 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9591,7 +9591,7 @@ void kvm_arch_hardware_disable(void)
 	drop_user_return_notifiers();
 }
 
-int kvm_arch_hardware_setup(void)
+int kvm_arch_hardware_setup(void *opaque)
 {
 	int r;
 
@@ -9627,7 +9627,7 @@ void kvm_arch_hardware_unsetup(void)
 	kvm_x86_ops->hardware_unsetup();
 }
 
-int kvm_arch_check_processor_compat(void)
+int kvm_arch_check_processor_compat(void *opaque)
 {
 	struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
 
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index e89eb67356cb..fb33a95067bd 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -882,9 +882,9 @@ void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu);
 
 int kvm_arch_hardware_enable(void);
 void kvm_arch_hardware_disable(void);
-int kvm_arch_hardware_setup(void);
+int kvm_arch_hardware_setup(void *opaque);
 void kvm_arch_hardware_unsetup(void);
-int kvm_arch_check_processor_compat(void);
+int kvm_arch_check_processor_compat(void *opaque);
 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index d65a0faa46d8..c92a70f58966 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -64,12 +64,12 @@ int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
 	return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
 }
 
-int kvm_arch_hardware_setup(void)
+int kvm_arch_hardware_setup(void *opaque)
 {
 	return 0;
 }
 
-int kvm_arch_check_processor_compat(void)
+int kvm_arch_check_processor_compat(void *opaque)
 {
 	return 0;
 }
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 67ae2d5c37b2..d719e4ee9ff7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4425,14 +4425,22 @@ struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
         return &kvm_running_vcpu;
 }
 
-static void check_processor_compat(void *rtn)
+struct kvm_cpu_compat_check {
+	void *opaque;
+	int *ret;
+};
+
+static void check_processor_compat(void *data)
 {
-	*(int *)rtn = kvm_arch_check_processor_compat();
+	struct kvm_cpu_compat_check *c = data;
+
+	*c->ret = kvm_arch_check_processor_compat(c->opaque);
 }
 
 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 		  struct module *module)
 {
+	struct kvm_cpu_compat_check c;
 	int r;
 	int cpu;
 
@@ -4456,12 +4464,14 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 		goto out_free_0;
 	}
 
-	r = kvm_arch_hardware_setup();
+	r = kvm_arch_hardware_setup(opaque);
 	if (r < 0)
 		goto out_free_1;
 
+	c.ret = &r;
+	c.opaque = opaque;
 	for_each_online_cpu(cpu) {
-		smp_call_function_single(cpu, check_processor_compat, &r, 1);
+		smp_call_function_single(cpu, check_processor_compat, &c, 1);
 		if (r < 0)
 			goto out_free_2;
 	}
-- 
2.24.1