From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Wed, 30 Aug 2017 11:15:49 +0000 (+0100)
Subject: x86/mm: Use mfn_t for new_guest_cr3()
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~1517
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=fe133170f6e75f88b080e441106df9edcf6e769b;p=xen.git

x86/mm: Use mfn_t for new_guest_cr3()

No functional change (as confirmed by diffing the assembly).

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 1f23470cef..326cd33d63 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -2772,23 +2772,23 @@ int vcpu_destroy_pagetables(struct vcpu *v)
     return rc != -EINTR ? rc : -ERESTART;
 }
 
-int new_guest_cr3(unsigned long mfn)
+int new_guest_cr3(mfn_t mfn)
 {
     struct vcpu *curr = current;
     struct domain *d = curr->domain;
     int rc;
-    unsigned long old_base_mfn;
+    mfn_t old_base_mfn;
 
     if ( is_pv_32bit_domain(d) )
     {
-        unsigned long gt_mfn = pagetable_get_pfn(curr->arch.guest_table);
-        l4_pgentry_t *pl4e = map_domain_page(_mfn(gt_mfn));
+        mfn_t gt_mfn = pagetable_get_mfn(curr->arch.guest_table);
+        l4_pgentry_t *pl4e = map_domain_page(gt_mfn);
 
         rc = mod_l4_entry(pl4e,
-                          l4e_from_pfn(mfn,
+                          l4e_from_mfn(mfn,
                                        (_PAGE_PRESENT | _PAGE_RW |
                                         _PAGE_USER | _PAGE_ACCESSED)),
-                          gt_mfn, 0, curr);
+                          mfn_x(gt_mfn), 0, curr);
         unmap_domain_page(pl4e);
         switch ( rc )
         {
@@ -2800,7 +2800,7 @@ int new_guest_cr3(unsigned long mfn)
         default:
             gdprintk(XENLOG_WARNING,
                      "Error while installing new compat baseptr %" PRI_mfn "\n",
-                     mfn);
+                     mfn_x(mfn));
             return rc;
         }
 
@@ -2814,20 +2814,20 @@ int new_guest_cr3(unsigned long mfn)
     if ( unlikely(rc) )
         return rc;
 
-    old_base_mfn = pagetable_get_pfn(curr->arch.guest_table);
+    old_base_mfn = pagetable_get_mfn(curr->arch.guest_table);
     /*
      * This is particularly important when getting restarted after the
      * previous attempt got preempted in the put-old-MFN phase.
      */
-    if ( old_base_mfn == mfn )
+    if ( mfn_eq(old_base_mfn, mfn) )
     {
         write_ptbase(curr);
         return 0;
     }
 
     rc = paging_mode_refcounts(d)
-         ? (get_page_from_mfn(_mfn(mfn), d) ? 0 : -EINVAL)
-         : get_page_and_type_from_mfn(_mfn(mfn), PGT_root_page_table, d, 0, 1);
+         ? (get_page_from_mfn(mfn, d) ? 0 : -EINVAL)
+         : get_page_and_type_from_mfn(mfn, PGT_root_page_table, d, 0, 1);
     switch ( rc )
     {
     case 0:
@@ -2837,22 +2837,23 @@ int new_guest_cr3(unsigned long mfn)
         return -ERESTART;
     default:
         gdprintk(XENLOG_WARNING,
-                 "Error while installing new baseptr %" PRI_mfn "\n", mfn);
+                 "Error while installing new baseptr %" PRI_mfn "\n",
+                 mfn_x(mfn));
         return rc;
     }
 
     invalidate_shadow_ldt(curr, 0);
 
     if ( !VM_ASSIST(d, m2p_strict) && !paging_mode_refcounts(d) )
-        fill_ro_mpt(_mfn(mfn));
-    curr->arch.guest_table = pagetable_from_pfn(mfn);
+        fill_ro_mpt(mfn);
+    curr->arch.guest_table = pagetable_from_mfn(mfn);
     update_cr3(curr);
 
     write_ptbase(curr);
 
-    if ( likely(old_base_mfn != 0) )
+    if ( likely(mfn_x(old_base_mfn) != 0) )
     {
-        struct page_info *page = mfn_to_page(_mfn(old_base_mfn));
+        struct page_info *page = mfn_to_page(old_base_mfn);
 
         if ( paging_mode_refcounts(d) )
             put_page(page);
@@ -3180,7 +3181,7 @@ long do_mmuext_op(
             else if ( unlikely(paging_mode_translate(currd)) )
                 rc = -EINVAL;
             else
-                rc = new_guest_cr3(op.arg1.mfn);
+                rc = new_guest_cr3(_mfn(op.arg1.mfn));
             break;
 
         case MMUEXT_NEW_USER_BASEPTR: {
diff --git a/xen/arch/x86/pv/emul-priv-op.c b/xen/arch/x86/pv/emul-priv-op.c
index af1624ae26..54a63c27f8 100644
--- a/xen/arch/x86/pv/emul-priv-op.c
+++ b/xen/arch/x86/pv/emul-priv-op.c
@@ -774,7 +774,7 @@ static int priv_op_write_cr(unsigned int reg, unsigned long val,
         page = get_page_from_gfn(currd, gfn, NULL, P2M_ALLOC);
         if ( !page )
             break;
-        rc = new_guest_cr3(mfn_x(page_to_mfn(page)));
+        rc = new_guest_cr3(page_to_mfn(page));
         put_page(page);
 
         switch ( rc )
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index ec7ce3c8c8..4c03a33e79 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -539,7 +539,7 @@ void audit_domains(void);
 
 #endif
 
-int new_guest_cr3(unsigned long pfn);
+int new_guest_cr3(mfn_t mfn);
 void make_cr3(struct vcpu *v, unsigned long mfn);
 void update_cr3(struct vcpu *v);
 int vcpu_destroy_pagetables(struct vcpu *);