[RFC PATCH v12 11/33] KVM: Introduce per-page memory attributes

[Binbin Wu]

On 9/21/2023 5:03 AM, Sean Christopherson wrote:
> On Mon, Sep 18, 2023, Binbin Wu wrote:
>>
>> On 9/14/2023 9:55 AM, Sean Christopherson wrote:
>>> From: Chao Peng <chao.p.peng at linux.intel.com>
>> [...]
>>> +#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
>>> +/*
>>> + * Returns true if _all_ gfns in the range [@start, @end) have attributes
>>> + * matching @attrs.
>>> + */
>>> +bool kvm_range_has_memory_attributes(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);
>> IIUIC, xas_find() is inclusive for "end", so here should be "end - 1" ?
> Yes, that does appear to be the case.  Inclusive vs. exclusive on gfn ranges has
> is the bane of my existence.

Seems this one is not included in the "KVM: guest_memfd fixes" patch series?
https://lore.kernel.org/kvm/20230921203331.3746712-1-seanjc@google.com/