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Commit 2329d46d authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
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KVM: MMU: Make walk_addr_generic capable for two-level walking 



This patch uses kvm_read_guest_page_tdp to make the
walk_addr_generic functions suitable for two-level page
table walking.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent ec92fe44

arch/x86/kvm/paging_tmpl.h

+23 −7
Original line number Diff line number Diff line
@@ -124,6 +124,8 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, 
	unsigned index, pt_access, uninitialized_var(pte_access);

	gpa_t pte_gpa;

	bool eperm, present, rsvd_fault;

	int offset;

	u32 access = 0;



	trace_kvm_mmu_pagetable_walk(addr, write_fault, user_fault,

				     fetch_fault);
@@ -153,12 +155,14 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, 
		index = PT_INDEX(addr, walker->level);



		table_gfn = gpte_to_gfn(pte);

		pte_gpa = gfn_to_gpa(table_gfn);

		pte_gpa += index * sizeof(pt_element_t);

		offset    = index * sizeof(pt_element_t);

		pte_gpa   = gfn_to_gpa(table_gfn) + offset;

		walker->table_gfn[walker->level - 1] = table_gfn;

		walker->pte_gpa[walker->level - 1] = pte_gpa;



		if (kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte))) {

		if (kvm_read_guest_page_mmu(vcpu, mmu, table_gfn, &pte,

					    offset, sizeof(pte),

					    PFERR_USER_MASK|PFERR_WRITE_MASK)) {

			present = false;

			break;

		}
@@ -209,15 +213,27 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, 
				is_large_pte(pte) &&

				mmu->root_level == PT64_ROOT_LEVEL)) {

			int lvl = walker->level;

			gpa_t real_gpa;

			gfn_t gfn;



			walker->gfn = gpte_to_gfn_lvl(pte, lvl);

			walker->gfn += (addr & PT_LVL_OFFSET_MASK(lvl))

					>> PAGE_SHIFT;

			gfn = gpte_to_gfn_lvl(pte, lvl);

			gfn += (addr & PT_LVL_OFFSET_MASK(lvl)) >> PAGE_SHIFT;



			if (PTTYPE == 32 &&

			    walker->level == PT_DIRECTORY_LEVEL &&

			    is_cpuid_PSE36())

				walker->gfn += pse36_gfn_delta(pte);

				gfn += pse36_gfn_delta(pte);



			access |= write_fault ? PFERR_WRITE_MASK : 0;

			access |= fetch_fault ? PFERR_FETCH_MASK : 0;

			access |= user_fault  ? PFERR_USER_MASK  : 0;



			real_gpa = mmu->translate_gpa(vcpu, gfn_to_gpa(gfn),

						      access);

			if (real_gpa == UNMAPPED_GVA)

				return 0;



			walker->gfn = real_gpa >> PAGE_SHIFT;



			break;

		}