Subject: Re: [RFC PATCH v11 09/29] KVM: x86: Disallow hugepages when memory attributes are mixed

From: Sean Christopherson <[email-masked]>
Date: Fri, 21 Jul 2023 10:41:14 -0700

On Fri, Jul 21, 2023, Paolo Bonzini wrote:
> On 7/19/23 01:44, Sean Christopherson wrote:
> > +static bool range_has_attrs(struct kvm *kvm, gfn_t start, gfn_t end,
> > +			    unsigned long attrs)
> > +{
> > +	XA_STATE(xas, &kvm->mem_attr_array, start);
> > +	unsigned long index;
> > +	bool has_attrs;
> > +	void *entry;
> > +
> > +	rcu_read_lock();
> > +
> > +	if (!attrs) {
> > +		has_attrs = !xas_find(&xas, end);
> > +		goto out;
> > +	}
> > +
> > +	has_attrs = true;
> > +	for (index = start; index < end; index++) {
> > +		do {
> > +			entry = xas_next(&xas);
> > +		} while (xas_retry(&xas, entry));
> > +
> > +		if (xas.xa_index != index || xa_to_value(entry) != attrs) {
> > +			has_attrs = false;
> > +			break;
> > +		}
> > +	}
> > +
> > +out:
> > +	rcu_read_unlock();
> > +	return has_attrs;
> > +}
> > +
> 
> Can you move this function to virt/kvm/kvm_main.c?

Ah, yeah, that's a good idea.

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