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SubjectRe: [PATCH] KVM: x86: Unconditionally call x86 ops that are always implemented
On Thu, Aug 01, 2019 at 02:42:07PM -0700, Sean Christopherson wrote:
> On Thu, Aug 01, 2019 at 02:39:38PM -0700, Krish Sadhukhan wrote:
> >
> >
> > On 08/01/2019 09:46 AM, Sean Christopherson wrote:
> > >Remove two stale checks for non-NULL ops now that they're implemented 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")
> > >Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> > >---
> > > arch/x86/kvm/x86.c | 8 ++------
> > > 1 file changed, 2 insertions(+), 6 deletions(-)
> > >
> > >diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > >index 01e18caac825..2c25a19d436f 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)
> >
> > The following two ops are also implemented by both VMX and SVM:
> >
> >         update_cr8_intercept
> >         update_pi_irte
>
> Drat, I didn't think to grep for !kvm_x86_ops. I'll spin a v2. Thanks!

Ah, but update_cr8_intercept is zapped by VMX if hardware doesn't support
the TPR shadow.

P.S. I meant to send this before posting v2, but I got distracted...

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