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SubjectRe: [PATCH v2 41/45] KVM: PPC: Move all vcpu init code into kvm_arch_vcpu_create()
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On 20/01/20 04:46, Paul Mackerras wrote:
> On Wed, Dec 18, 2019 at 01:55:26PM -0800, Sean Christopherson wrote:
>> Fold init() into create() now that the two are called back-to-back by
>> common KVM code (kvm_vcpu_init() calls kvm_arch_vcpu_init() as its last
>> action, and kvm_vm_ioctl_create_vcpu() calls kvm_arch_vcpu_create()
>> immediately thereafter). Rinse and repeat for kvm_arch_vcpu_uninit()
>> and kvm_arch_vcpu_destroy(). This paves the way for removing
>> kvm_arch_vcpu_{un}init() entirely.
>>
>> Note, calling kvmppc_mmu_destroy() if kvmppc_core_vcpu_create() fails
>> may or may not be necessary. Move it along with the more obvious call
>> to kvmppc_subarch_vcpu_uninit() so as not to inadvertantly introduce a
>> functional change and/or bug.
>>
>> No functional change intended.
>>
>> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
>
> This doesn't compile. I get:
>
> CC [M] arch/powerpc/kvm/powerpc.o
> /home/paulus/kernel/kvm/arch/powerpc/kvm/powerpc.c: In function ‘kvm_arch_vcpu_create’:
> /home/paulus/kernel/kvm/arch/powerpc/kvm/powerpc.c:733:34: error: ‘kvmppc_decrementer_wakeup’ undeclared (first use in this function)
> vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
> ^
> /home/paulus/kernel/kvm/arch/powerpc/kvm/powerpc.c:733:34: note: each undeclared identifier is reported only once for each function it appears in
> /home/paulus/kernel/kvm/arch/powerpc/kvm/powerpc.c: At top level:
> /home/paulus/kernel/kvm/arch/powerpc/kvm/powerpc.c:794:29: warning: ‘kvmppc_decrementer_wakeup’ defined but not used [-Wunused-function]
> static enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
> ^
> make[3]: *** [/home/paulus/kernel/kvm/scripts/Makefile.build:266: arch/powerpc/kvm/powerpc.o] Error 1
>
> The problem is that kvmppc_decrementer_wakeup() is a static function
> defined in this file (arch/powerpc/kvm/powerpc.c) after
> kvm_arch_vcpu_create() but before kvm_arch_vcpu_init(). You need a
> forward static declaration of kvmppc_decrementer_wakeup() before
> kvm_arch_vcpu_create(), or else move one or other function.
>
> Paul.
>

Squashed:

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 91cf94d4191e..4fbf8690b8c5 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -725,6 +725,16 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
return 0;
}

+static enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
+{
+ struct kvm_vcpu *vcpu;
+
+ vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
+ kvmppc_decrementer_func(vcpu);
+
+ return HRTIMER_NORESTART;
+}
+
int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
int err;
@@ -791,16 +801,6 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
return kvmppc_core_pending_dec(vcpu);
}

-static enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
-{
- struct kvm_vcpu *vcpu;
-
- vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
- kvmppc_decrementer_func(vcpu);
-
- return HRTIMER_NORESTART;
-}
-
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
return 0;
Paolo

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