KVM: Pass kvm_init()'s opaque param to additional arch funcs

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@redhat.com>
Tested-by: Cornelia Huck <cohuck@redhat.com> #s390
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200321202603.19355-2-sean.j.christopherson@intel.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 7850775..8f05dd0 100644 (file)
--- 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 c48862d..e15166b 100644 (file)
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -415,12 +415,12 @@ 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 6b2649b..f6268df 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -235,7 +235,7 @@ 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;
 }
@@ -302,7 +302,7 @@ 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 1b6d9ac..a656fba 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9626,7 +9626,7 @@ 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;
 
@@ -9667,7 +9667,7 @@ 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 f6a1905..6d58beb 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -886,9 +886,9 @@ 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 376c6a7..48d0ec4 100644 (file)
--- 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 f744bc6..74bdb7b 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4648,14 +4648,22 @@ 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;
 
@@ -4679,12 +4687,14 @@ 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;
        }