Re: [PATCH 5/5] KVM: x86: Set kvm_x86_ops only after ->hardware_setup() completes

2020-01-31 Thread Sean Christopherson
On Thu, Jan 30, 2020 at 06:44:09AM +0100, Paolo Bonzini wrote:
> On 30/01/20 01:10, Sean Christopherson wrote:
> > Set kvm_x86_ops with the vendor's ops only after ->hardware_setup()
> > completes to "prevent" using kvm_x86_ops before they are ready, i.e. to
> > generate a null pointer fault instead of silently consuming unconfigured
> > state.
> 
> What about even copying kvm_x86_ops by value, so that they can be
> accessed with "kvm_x86_ops.callback()" and save one memory access?

Oooh, I like that idea.  And {svm,vmx}_x86_ops could be marked __initdata
to save a few bytes and force all the runtime stuff through kvm_x86_ops.
___
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm


Re: [PATCH 5/5] KVM: x86: Set kvm_x86_ops only after ->hardware_setup() completes

2020-01-29 Thread Paolo Bonzini
On 30/01/20 01:10, Sean Christopherson wrote:
> Set kvm_x86_ops with the vendor's ops only after ->hardware_setup()
> completes to "prevent" using kvm_x86_ops before they are ready, i.e. to
> generate a null pointer fault instead of silently consuming unconfigured
> state.

What about even copying kvm_x86_ops by value, so that they can be
accessed with "kvm_x86_ops.callback()" and save one memory access?

Paolo

___
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm