Re: [PATCH v2 07/20] kvm: x86/mmu: Support zapping SPTEs in the TDP MMU

[Paolo Bonzini]

On 21/10/20 17:02, Yu Zhang wrote:
>>  void kvm_tdp_mmu_free_root(struct kvm *kvm, struct kvm_mmu_page *root)
>>  {
>> +	gfn_t max_gfn = 1ULL << (boot_cpu_data.x86_phys_bits - PAGE_SHIFT);
>> +
> boot_cpu_data.x86_phys_bits is the host address width. Value of the guest's
> may vary. So maybe we should just traverse the memslots and zap the gfn ranges
> in each of them?
> 

It must be smaller than the host value for two-dimensional paging, though.

Paolo