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SubjectRe: [PATCH v2] KVM: x86: Unconditionally call x86 ops that are always implemented
On Fri, Aug 02, 2019 at 03:48:27PM -0700, Krish Sadhukhan wrote:
>
> On 08/02/2019 03:06 PM, Sean Christopherson wrote:
> >Remove a few stale checks for non-NULL ops now that the ops in question
> >are implemented by both VMX and SVM.
> >
> >Note, this is **not** stable material, the Fixes tags are there purely
> >to show when a particular op was first supported by both VMX and SVM.
> >
> >Fixes: 74f169090b6f ("kvm/svm: Setup MCG_CAP on AMD properly")
> >Fixes: b31c114b82b2 ("KVM: X86: Provide a capability to disable PAUSE intercepts")
> >Fixes: 411b44ba80ab ("svm: Implements update_pi_irte hook to setup posted interrupt")
> >Cc: Krish Sadhukhan <krish.sadhukhan@oracle.com>
> >Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> >---
> >
> >v2: Give update_pi_iret the same treatment [Krish].
> >
> > arch/x86/kvm/x86.c | 13 +++----------
> > 1 file changed, 3 insertions(+), 10 deletions(-)
> >
> >diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> >index 01e18caac825..e7c993f0cbed 100644
> >--- a/arch/x86/kvm/x86.c
> >+++ b/arch/x86/kvm/x86.c
> >@@ -3506,8 +3506,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
> > for (bank = 0; bank < bank_num; bank++)
> > vcpu->arch.mce_banks[bank*4] = ~(u64)0;
> >- if (kvm_x86_ops->setup_mce)
> >- kvm_x86_ops->setup_mce(vcpu);
> >+ kvm_x86_ops->setup_mce(vcpu);
> > out:
> > return r;
> > }
> >@@ -9313,10 +9312,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
> > kvm_page_track_init(kvm);
> > kvm_mmu_init_vm(kvm);
> >- if (kvm_x86_ops->vm_init)
> >- return kvm_x86_ops->vm_init(kvm);
> >-
> >- return 0;
> >+ return kvm_x86_ops->vm_init(kvm);
> > }
> > static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
> >@@ -9992,7 +9988,7 @@ EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma);
> > bool kvm_arch_has_irq_bypass(void)
>
> Now that this is returning true always and that this is called only in
> kvm_irqfd_assign(), this can perhaps be removed altogether ?

No go, PowerPC has a conditional implementation.

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