[PATCH v3 3/3] KVM: MMU: Introduce is_last_gpte() to clean up walk_addr_generic()

[Takuya Yoshikawa <takuya.yoshikawa@gmail.com>]

From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>

Suggested by Ingo and Avi.

Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
---
 v2-v3: dropped set_accessed_bit()

 arch/x86/kvm/paging_tmpl.h |   26 +++++++++++++++++++-------
 1 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 92fe275..e9243c8 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -113,6 +113,24 @@ static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte)
 	return access;
 }
 
+static bool FNAME(is_last_gpte)(struct guest_walker *walker,
+				struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+				pt_element_t gpte)
+{
+	if (walker->level == PT_PAGE_TABLE_LEVEL)
+		return true;
+
+	if ((walker->level == PT_DIRECTORY_LEVEL) && is_large_pte(gpte) &&
+	    (PTTYPE == 64 || is_pse(vcpu)))
+		return true;
+
+	if ((walker->level == PT_PDPE_LEVEL) && is_large_pte(gpte) &&
+	    (mmu->root_level == PT64_ROOT_LEVEL))
+		return true;
+
+	return false;
+}
+
 /*
  * Fetch a guest pte for a guest virtual address
  */
@@ -232,13 +250,7 @@ retry_walk:
 
 		walker->ptes[walker->level - 1] = pte;
 
-		if ((walker->level == PT_PAGE_TABLE_LEVEL) ||
-		    ((walker->level == PT_DIRECTORY_LEVEL) &&
-				is_large_pte(pte) &&
-				(PTTYPE == 64 || is_pse(vcpu))) ||
-		    ((walker->level == PT_PDPE_LEVEL) &&
-				is_large_pte(pte) &&
-				mmu->root_level == PT64_ROOT_LEVEL)) {
+		if (FNAME(is_last_gpte)(walker, vcpu, mmu, pte)) {
 			int lvl = walker->level;
 			gpa_t real_gpa;
 			gfn_t gfn;
-- 
1.7.4.1