[PATCH v3 04/13] nEPT: Define EPT-specific link_shadow_page()

[Jun Nakajima <jun.nakajima@intel.com>]

Since link_shadow_page() is used by a routine in mmu.c, add an
EPT-specific link_shadow_page() in paging_tmp.h, rather than moving
it.

Signed-off-by: Nadav Har'El <nyh@il.ibm.com>
Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Signed-off-by: Xinhao Xu <xinhao.xu@intel.com>
---
 arch/x86/kvm/paging_tmpl.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 4c45654..dc495f9 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -461,6 +461,18 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw,
 	}
 }
 
+#if PTTYPE == PTTYPE_EPT
+static void FNAME(link_shadow_page)(u64 *sptep, struct kvm_mmu_page *sp)
+{
+	u64 spte;
+
+	spte = __pa(sp->spt) | VMX_EPT_READABLE_MASK | VMX_EPT_WRITABLE_MASK |
+		VMX_EPT_EXECUTABLE_MASK;
+
+	mmu_spte_set(sptep, spte);
+}
+#endif
+
 /*
  * Fetch a shadow pte for a specific level in the paging hierarchy.
  * If the guest tries to write a write-protected page, we need to
@@ -513,7 +525,11 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
 			goto out_gpte_changed;
 
 		if (sp)
+#if PTTYPE == PTTYPE_EPT
+			FNAME(link_shadow_page)(it.sptep, sp);
+#else
 			link_shadow_page(it.sptep, sp);
+#endif
 	}
 
 	for (;
@@ -533,7 +549,11 @@ 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);
+#if PTTYPE == PTTYPE_EPT
+		FNAME(link_shadow_page)(it.sptep, sp);
+#else
 		link_shadow_page(it.sptep, sp);
+#endif
 	}
 
 	clear_sp_write_flooding_count(it.sptep);
-- 
1.8.1.2