diff mbox series

[03/44] KVM: Allocate cpus_hardware_enabled after arch hardware setup

Message ID 20221102231911.3107438-4-seanjc@google.com
State New
Headers
Series KVM: Rework kvm_init() and hardware enabling |

Commit Message

Sean Christopherson Nov. 2, 2022, 11:18 p.m. UTC 
  Allocate cpus_hardware_enabled after arch hardware setup so that arch
"init" and "hardware setup" are called back-to-back and thus can be
combined in a future patch.  cpus_hardware_enabled is never used before
kvm_create_vm(), i.e. doesn't have a dependency with hardware setup and
only needs to be allocated before /dev/kvm is exposed to userspace.

Free the object before the arch hooks are invoked to maintain symmetry,
and so that arch code can move away from the hooks without having to
worry about ordering changes.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 virt/kvm/kvm_main.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

Comments

Yuan Yao Nov. 4, 2022, 5:37 a.m. UTC | #1 
On Wed, Nov 02, 2022 at 11:18:30PM +0000, Sean Christopherson wrote:
> Allocate cpus_hardware_enabled after arch hardware setup so that arch
> "init" and "hardware setup" are called back-to-back and thus can be
> combined in a future patch.  cpus_hardware_enabled is never used before
> kvm_create_vm(), i.e. doesn't have a dependency with hardware setup and
> only needs to be allocated before /dev/kvm is exposed to userspace.
>
> Free the object before the arch hooks are invoked to maintain symmetry,
> and so that arch code can move away from the hooks without having to
> worry about ordering changes.
>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  virt/kvm/kvm_main.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index e0424af52acc..8b7534cc953b 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -5843,15 +5843,15 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
>  	if (r)
>  		return r;
>
> +	r = kvm_arch_hardware_setup(opaque);
> +	if (r < 0)
> +		goto err_hw_setup;
> +
>  	if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
>  		r = -ENOMEM;
>  		goto err_hw_enabled;
>  	}
>
> -	r = kvm_arch_hardware_setup(opaque);
> -	if (r < 0)
> -		goto out_free_1;
> -
>  	c.ret = &r;
>  	c.opaque = opaque;
>  	for_each_online_cpu(cpu) {
> @@ -5937,10 +5937,10 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
>  	unregister_reboot_notifier(&kvm_reboot_notifier);
>  	cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
>  out_free_2:
> -	kvm_arch_hardware_unsetup();
> -out_free_1:
>  	free_cpumask_var(cpus_hardware_enabled);
>  err_hw_enabled:
> +	kvm_arch_hardware_unsetup();
> +err_hw_setup:
>  	kvm_arch_exit();
>  	return r;
>  }
> @@ -5967,9 +5967,9 @@ void kvm_exit(void)
>  	cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
>  	on_each_cpu(hardware_disable_nolock, NULL, 1);
>  	kvm_irqfd_exit();
> +	free_cpumask_var(cpus_hardware_enabled);
>  	kvm_arch_hardware_unsetup();
>  	kvm_arch_exit();
> -	free_cpumask_var(cpus_hardware_enabled);
>  	kvm_vfio_ops_exit();

Looks good to me.

Reviewed-by: Yuan Yao <yuan.yao@intel.com>

>  }
>  EXPORT_SYMBOL_GPL(kvm_exit);
> --
> 2.38.1.431.g37b22c650d-goog
>
diff mbox series

Patch

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e0424af52acc..8b7534cc953b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -5843,15 +5843,15 @@  int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 	if (r)
 		return r;
 
+	r = kvm_arch_hardware_setup(opaque);
+	if (r < 0)
+		goto err_hw_setup;
+
 	if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
 		r = -ENOMEM;
 		goto err_hw_enabled;
 	}
 
-	r = kvm_arch_hardware_setup(opaque);
-	if (r < 0)
-		goto out_free_1;
-
 	c.ret = &r;
 	c.opaque = opaque;
 	for_each_online_cpu(cpu) {
@@ -5937,10 +5937,10 @@  int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 	unregister_reboot_notifier(&kvm_reboot_notifier);
 	cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
 out_free_2:
-	kvm_arch_hardware_unsetup();
-out_free_1:
 	free_cpumask_var(cpus_hardware_enabled);
 err_hw_enabled:
+	kvm_arch_hardware_unsetup();
+err_hw_setup:
 	kvm_arch_exit();
 	return r;
 }
@@ -5967,9 +5967,9 @@  void kvm_exit(void)
 	cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
 	on_each_cpu(hardware_disable_nolock, NULL, 1);
 	kvm_irqfd_exit();
+	free_cpumask_var(cpus_hardware_enabled);
 	kvm_arch_hardware_unsetup();
 	kvm_arch_exit();
-	free_cpumask_var(cpus_hardware_enabled);
 	kvm_vfio_ops_exit();
 }
 EXPORT_SYMBOL_GPL(kvm_exit);