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Commit 7a1638ce authored by Yang Zhang's avatar Yang Zhang Committed by Paolo Bonzini
Browse files

nEPT: Redefine EPT-specific link_shadow_page() 



Since nEPT doesn't support A/D bit, so we should not set those bit
when build shadow page table.

Reviewed-by: default avatarXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: default avatarYang Zhang <yang.z.zhang@Intel.com>
Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 37406aaa

arch/x86/kvm/mmu.c

+9 −3
Original line number Diff line number Diff line
@@ -2047,12 +2047,18 @@ static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator) 
	return __shadow_walk_next(iterator, *iterator->sptep);

}



static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp)

static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp, bool accessed)

{

	u64 spte;



	BUILD_BUG_ON(VMX_EPT_READABLE_MASK != PT_PRESENT_MASK ||

			VMX_EPT_WRITABLE_MASK != PT_WRITABLE_MASK);



	spte = __pa(sp->spt) | PT_PRESENT_MASK | PT_WRITABLE_MASK |

	       shadow_user_mask | shadow_x_mask | shadow_accessed_mask;

	       shadow_user_mask | shadow_x_mask;



	if (accessed)

		spte |= shadow_accessed_mask;



	mmu_spte_set(sptep, spte);

}
@@ -2677,7 +2683,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write, 
					      iterator.level - 1,

					      1, ACC_ALL, iterator.sptep);



			link_shadow_page(iterator.sptep, sp);

			link_shadow_page(iterator.sptep, sp, true);

		}

	}

	return emulate;

arch/x86/kvm/paging_tmpl.h

+2 −2
Original line number Diff line number Diff line
@@ -555,7 +555,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, 
			goto out_gpte_changed;



		if (sp)

			link_shadow_page(it.sptep, sp);

			link_shadow_page(it.sptep, sp, PT_GUEST_ACCESSED_MASK);

	}



	for (;
@@ -575,7 +575,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, 


		sp = kvm_mmu_get_page(vcpu, direct_gfn, addr, it.level-1,

				      true, direct_access, it.sptep);

		link_shadow_page(it.sptep, sp);

		link_shadow_page(it.sptep, sp, PT_GUEST_ACCESSED_MASK);

	}



	clear_sp_write_flooding_count(it.sptep);