KVM: MMU: Move pse36 handling to the guest walker

Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index 346aa65..a9fed59 100644 (file)
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -218,6 +218,13 @@ static int is_rmap_pte(u64 pte)
                && pte != shadow_notrap_nonpresent_pte;
 }
 
+static gfn_t pse36_gfn_delta(u32 gpte)
+{
+       int shift = 32 - PT32_DIR_PSE36_SHIFT - PAGE_SHIFT;
+
+       return (gpte & PT32_DIR_PSE36_MASK) << shift;
+}
+
 static void set_shadow_pte(u64 *sptep, u64 spte)
 {
 #ifdef CONFIG_X86_64

diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index 6f79ae8..dceb4b9 100644 (file)
--- a/drivers/kvm/paging_tmpl.h
+++ b/drivers/kvm/paging_tmpl.h
@@ -149,6 +149,8 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
                    && (PTTYPE == 64 || is_pse(vcpu))) {
                        walker->gfn = gpte_to_gfn_pde(pte);
                        walker->gfn += PT_INDEX(addr, PT_PAGE_TABLE_LEVEL);
+                       if (PTTYPE == 32 && is_cpuid_PSE36())
+                               walker->gfn += pse36_gfn_delta(pte);
                        break;
                }
 
@@ -320,9 +322,6 @@ static void FNAME(set_pde)(struct kvm_vcpu *vcpu, pt_element_t gpde,
 
        access_bits &= gpde;
        gaddr = (gpa_t)gfn << PAGE_SHIFT;
-       if (PTTYPE == 32 && is_cpuid_PSE36())
-               gaddr |= (gpde & PT32_DIR_PSE36_MASK) <<
-                       (32 - PT32_DIR_PSE36_SHIFT);
        FNAME(set_pte_common)(vcpu, shadow_pte, gaddr,
                              gpde, access_bits, user_fault, write_fault,
                              ptwrite, walker, gfn);