Re: [PATCH v7 05/12] KVM: guest_memfd: Add flag to remove from direct map

"Roy, Patrick" roypat@amazon.co.uk writes:

....

+static int kvm_gmem_folio_zap_direct_map(struct folio *folio) +{

• if (kvm_gmem_folio_no_direct_map(folio))

• return 0;
  

• int r = set_direct_map_valid_noflush(folio_page(folio, 0), folio_nr_pages(folio),

• 			 false);
  

• if (!r) {

• unsigned long addr = (unsigned long) folio_address(folio);
  

• folio->private = (void *) ((u64) folio->private & KVM_GMEM_FOLIO_NO_DIRECT_MAP);
  

• flush_tlb_kernel_range(addr, addr + folio_size(folio));
  

• }
• return r;

+}

These 'noflush' functions are actually doing flush_tlb_kernel

[-] ∘ flush_tlb_kernel_range |-[-] ← __change_memory_common | `-[-] ← set_memory_valid | `- ← set_direct_map_valid_noflush

-aneesh