Re: [PATCH] 5/5 Make kvm_init as arch-indepenent

[Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>]

Acked-by: Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
Zhang, Xiantao wrote:
>>From 2d6ee07b96f1a91cef9327f241077af3698ed4dc Mon Sep 17 00:00:00 2001
> From: Zhang Xiantao <xiantao.zhang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> Date: Thu, 8 Nov 2007 13:37:38 +0800
> Subject: [PATCH] Make kvm_init as arch-indepenent, through defining a
> void
> pointer type variable. All archs will register their corresponding arch
> functions
> into kvm module. For example, x86 will use it to register vmx/svm's ops.
> Signed-off-by: Zhang Xiantao <xiantao.zhang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> ---
>  drivers/kvm/kvm.h      |    5 +++--
>  drivers/kvm/kvm_main.c |   26 ++++++--------------------
>  drivers/kvm/x86.c      |   27 ++++++++++++++++++++++++++-
>  3 files changed, 35 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
> index 33b4629..9b6087f 100644
> --- a/drivers/kvm/kvm.h
> +++ b/drivers/kvm/kvm.h
> @@ -494,7 +494,7 @@ void vcpu_load(struct kvm_vcpu *vcpu);
>  void vcpu_put(struct kvm_vcpu *vcpu);
> 
> 
> -int kvm_init(struct kvm_x86_ops *ops, unsigned int vcpu_size,
> +int kvm_init(void *opaque, unsigned int vcpu_size,
>  		  struct module *module);
>  void kvm_exit(void);
> 
> @@ -647,7 +647,8 @@ int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu
> *vcpu,
>  				    struct kvm_debug_guest *dbg);
>  int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run
> *kvm_run);
> 
> -__init void kvm_arch_init(void);
> +int kvm_arch_init(void *opaque);
> +void kvm_arch_exit(void);
> 
> 
>  void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
> diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
> index 8f09170..70bc4d4 100644
> --- a/drivers/kvm/kvm_main.c
> +++ b/drivers/kvm/kvm_main.c
> @@ -1503,7 +1503,7 @@ static void kvm_sched_out(struct preempt_notifier
> *pn,
>  	kvm_arch_vcpu_put(vcpu);
>  }
> 
> -int kvm_init(struct kvm_x86_ops *ops, unsigned int vcpu_size,
> +int kvm_init(void *opaque, unsigned int vcpu_size,
>  		  struct module *module)
>  {
>  	int r;
> @@ -1515,7 +1515,9 @@ int kvm_init(struct kvm_x86_ops *ops, unsigned int
> vcpu_size,
> 
>  	kvm_init_debug();
> 
> -	kvm_arch_init();
> +	r = kvm_arch_init(opaque);
> +	if (r)
> +		goto out4;
> 
>  	bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
> 
> @@ -1524,22 +1526,6 @@ int kvm_init(struct kvm_x86_ops *ops, unsigned
> int vcpu_size,
>  		goto out;
>  	}
> 
> -	if (kvm_x86_ops) {
> -		printk(KERN_ERR "kvm: already loaded the other
> module\n");
> -		return -EEXIST;
> -	}
> -
> -	if (!ops->cpu_has_kvm_support()) {
> -		printk(KERN_ERR "kvm: no hardware support\n");
> -		return -EOPNOTSUPP;
> -	}
> -	if (ops->disabled_by_bios()) {
> -		printk(KERN_ERR "kvm: disabled by bios\n");
> -		return -EOPNOTSUPP;
> -	}
> -
> -	kvm_x86_ops = ops;
> -
>  	r = kvm_arch_hardware_setup();
>  	if (r < 0)
>  		goto out;
> @@ -1603,7 +1589,7 @@ out_free_1:
>  out_free_0:
>  	kvm_arch_hardware_unsetup();
>  out:
> -	kvm_x86_ops = NULL;
> +	kvm_arch_exit();
>  	kvm_exit_debug();
>  	kvm_mmu_module_exit();
>  out4:   
> @@ -1621,7 +1607,7 @@ void kvm_exit(void)
>  	unregister_cpu_notifier(&kvm_cpu_notifier);
>  	on_each_cpu(hardware_disable, NULL, 0, 1);
>  	kvm_arch_hardware_unsetup();
> -	kvm_x86_ops = NULL;
> +	kvm_arch_exit();
>  	kvm_exit_debug();
>  	__free_page(bad_page);
>  	kvm_mmu_module_exit();
> diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
> index 8aea240..22b3cc6 100644
> --- a/drivers/kvm/x86.c
> +++ b/drivers/kvm/x86.c
> @@ -1611,9 +1611,34 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu,
> struct kvm_run *run, int in,
>  }
>  EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
> 
> -__init void kvm_arch_init(void)
> +int kvm_arch_init(void *opaque)
>  {
> +	struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
> +
>  	kvm_init_msr_list();
> +
> +	if (kvm_x86_ops) {
> +		printk(KERN_ERR "kvm: already loaded the other
> module\n");
> +		return -EEXIST;
> +	}
> +
> +	if (!ops->cpu_has_kvm_support()) {
> +		printk(KERN_ERR "kvm: no hardware support\n");
> +		return -EOPNOTSUPP;
> +	}
> +	if (ops->disabled_by_bios()) {
> +		printk(KERN_ERR "kvm: disabled by bios\n");
> +		return -EOPNOTSUPP;
> +	}
> +
> +	kvm_x86_ops = ops;
> +
> +	return 0;
> +}
> +
> +void kvm_arch_exit(void)
> +{
> +	kvm_x86_ops = NULL;
>  }
> 
>  int kvm_emulate_halt(struct kvm_vcpu *vcpu)


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