Re: [PATCH 2/2] KVM: VMX: Enable memory mapped TPR shadow(FlexPriority)

[Izik Eidus <izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Yang, Sheng wrote:
>  
> +static int alloc_apic_access_page(struct kvm *kvm)
> +{
> +	struct kvm_userspace_memory_region kvm_userspace_mem;
> +	int r;
> +
> +	r = -EFAULT;
> +	/* Top memslot for apic access page */
> +	if (kvm->nmemslots == KVM_MEMORY_SLOTS)
> +		return r;
> +	kvm_userspace_mem.slot = kvm->nmemslots + 1;
> +	kvm_userspace_mem.flags = 0;
> +	kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
> +	kvm_userspace_mem.memory_size = PAGE_SIZE;
> +	r = kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
> +	if (r)
> +		return r;
> +	kvm->apic_access_page = gfn_to_page(kvm, 0xfee00);
> +	return 0;
> +}
you probably want to use slot number 9 (every slot above KVM_MEMORY_SLOT 
and below KVM_MEMORY_SLOT + KVM+PRIVATE_MEM_SLOTS are private slots that 
meant to be used like you use them in your patch,) using the number 9 
slot will make the slot invisible to the guest
and insure that at runtime the user can still allocate and remove slots 
without clashing with your slots.
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