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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