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From: Hongyan Xia <hx242@xen.org>
To: xen-devel@lists.xenproject.org
Cc: jgrall@amazon.com, "Jan Beulich" <jbeulich@suse.com>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>, "Wei Liu" <wl@xen.org>
Subject: [PATCH v10 03/13] x86/mm: switch to new APIs in modify_xen_mappings
Date: Wed, 21 Apr 2021 15:15:31 +0100	[thread overview]
Message-ID: <8a15361c10f2cdcf2bd4a973d10c45be6a2536e3.1619014052.git.hongyxia@amazon.com> (raw)
In-Reply-To: <cover.1619014052.git.hongyxia@amazon.com>
In-Reply-To: <cover.1619014052.git.hongyxia@amazon.com>

From: Wei Liu <wei.liu2@citrix.com>

Page tables allocated in that function should be mapped and unmapped
now.

Note that pl2e now maybe mapped and unmapped in different iterations, so
we need to add clean-ups for that.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

---
Changed in v7:
- use normal unmap in the error path.
---
 xen/arch/x86/mm.c | 57 ++++++++++++++++++++++++++++++-----------------
 1 file changed, 36 insertions(+), 21 deletions(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 8a68da26f45f..832e654294b4 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -5546,6 +5546,7 @@ int map_pages_to_xen(
 
  out:
     L3T_UNLOCK(current_l3page);
+    unmap_domain_page(pl2e);
     unmap_domain_page(pl3e);
     unmap_domain_page(pl2e);
     return rc;
@@ -5572,7 +5573,7 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf)
 {
     bool locking = system_state > SYS_STATE_boot;
     l3_pgentry_t *pl3e = NULL;
-    l2_pgentry_t *pl2e;
+    l2_pgentry_t *pl2e = NULL;
     l1_pgentry_t *pl1e;
     unsigned int  i;
     unsigned long v = s;
@@ -5592,6 +5593,7 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf)
     {
         /* Clean up the previous iteration. */
         L3T_UNLOCK(current_l3page);
+        UNMAP_DOMAIN_PAGE(pl2e);
         UNMAP_DOMAIN_PAGE(pl3e);
 
         pl3e = virt_to_xen_l3e(v);
@@ -5614,6 +5616,7 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf)
         if ( l3e_get_flags(*pl3e) & _PAGE_PSE )
         {
             l2_pgentry_t *l2t;
+            mfn_t l2mfn;
 
             if ( l2_table_offset(v) == 0 &&
                  l1_table_offset(v) == 0 &&
@@ -5630,35 +5633,38 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf)
             }
 
             /* PAGE1GB: shatter the superpage and fall through. */
-            l2t = alloc_xen_pagetable();
-            if ( !l2t )
+            l2mfn = alloc_xen_pagetable_new();
+            if ( mfn_eq(l2mfn, INVALID_MFN) )
                 goto out;
 
+            l2t = map_domain_page(l2mfn);
             for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ )
                 l2e_write(l2t + i,
                           l2e_from_pfn(l3e_get_pfn(*pl3e) +
                                        (i << PAGETABLE_ORDER),
                                        l3e_get_flags(*pl3e)));
+            UNMAP_DOMAIN_PAGE(l2t);
+
             if ( locking )
                 spin_lock(&map_pgdir_lock);
             if ( (l3e_get_flags(*pl3e) & _PAGE_PRESENT) &&
                  (l3e_get_flags(*pl3e) & _PAGE_PSE) )
             {
-                l3e_write_atomic(pl3e, l3e_from_mfn(virt_to_mfn(l2t),
-                                                    __PAGE_HYPERVISOR));
-                l2t = NULL;
+                l3e_write_atomic(pl3e,
+                                 l3e_from_mfn(l2mfn, __PAGE_HYPERVISOR));
+                l2mfn = INVALID_MFN;
             }
             if ( locking )
                 spin_unlock(&map_pgdir_lock);
-            if ( l2t )
-                free_xen_pagetable(l2t);
+
+            free_xen_pagetable_new(l2mfn);
         }
 
         /*
          * The L3 entry has been verified to be present, and we've dealt with
          * 1G pages as well, so the L2 table cannot require allocation.
          */
-        pl2e = l3e_to_l2e(*pl3e) + l2_table_offset(v);
+        pl2e = map_l2t_from_l3e(*pl3e) + l2_table_offset(v);
 
         if ( !(l2e_get_flags(*pl2e) & _PAGE_PRESENT) )
         {
@@ -5686,41 +5692,45 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf)
             else
             {
                 l1_pgentry_t *l1t;
-
                 /* PSE: shatter the superpage and try again. */
-                l1t = alloc_xen_pagetable();
-                if ( !l1t )
+                mfn_t l1mfn = alloc_xen_pagetable_new();
+
+                if ( mfn_eq(l1mfn, INVALID_MFN) )
                     goto out;
 
+                l1t = map_domain_page(l1mfn);
                 for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
                     l1e_write(&l1t[i],
                               l1e_from_pfn(l2e_get_pfn(*pl2e) + i,
                                            l2e_get_flags(*pl2e) & ~_PAGE_PSE));
+                UNMAP_DOMAIN_PAGE(l1t);
+
                 if ( locking )
                     spin_lock(&map_pgdir_lock);
                 if ( (l2e_get_flags(*pl2e) & _PAGE_PRESENT) &&
                      (l2e_get_flags(*pl2e) & _PAGE_PSE) )
                 {
-                    l2e_write_atomic(pl2e, l2e_from_mfn(virt_to_mfn(l1t),
+                    l2e_write_atomic(pl2e, l2e_from_mfn(l1mfn,
                                                         __PAGE_HYPERVISOR));
-                    l1t = NULL;
+                    l1mfn = INVALID_MFN;
                 }
                 if ( locking )
                     spin_unlock(&map_pgdir_lock);
-                if ( l1t )
-                    free_xen_pagetable(l1t);
+
+                free_xen_pagetable_new(l1mfn);
             }
         }
         else
         {
             l1_pgentry_t nl1e, *l1t;
+            mfn_t l1mfn;
 
             /*
              * Ordinary 4kB mapping: The L2 entry has been verified to be
              * present, and we've dealt with 2M pages as well, so the L1 table
              * cannot require allocation.
              */
-            pl1e = l2e_to_l1e(*pl2e) + l1_table_offset(v);
+            pl1e = map_l1t_from_l2e(*pl2e) + l1_table_offset(v);
 
             /* Confirm the caller isn't trying to create new mappings. */
             if ( !(l1e_get_flags(*pl1e) & _PAGE_PRESENT) )
@@ -5731,6 +5741,7 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf)
                                (l1e_get_flags(*pl1e) & ~FLAGS_MASK) | nf);
 
             l1e_write_atomic(pl1e, nl1e);
+            UNMAP_DOMAIN_PAGE(pl1e);
             v += PAGE_SIZE;
 
             /*
@@ -5760,10 +5771,12 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf)
                 continue;
             }
 
-            l1t = l2e_to_l1e(*pl2e);
+            l1mfn = l2e_get_mfn(*pl2e);
+            l1t = map_domain_page(l1mfn);
             for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
                 if ( l1e_get_intpte(l1t[i]) != 0 )
                     break;
+            UNMAP_DOMAIN_PAGE(l1t);
             if ( i == L1_PAGETABLE_ENTRIES )
             {
                 /* Empty: zap the L2E and free the L1 page. */
@@ -5771,7 +5784,7 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf)
                 if ( locking )
                     spin_unlock(&map_pgdir_lock);
                 flush_area(NULL, FLUSH_TLB_GLOBAL); /* flush before free */
-                free_xen_pagetable(l1t);
+                free_xen_pagetable_new(l1mfn);
             }
             else if ( locking )
                 spin_unlock(&map_pgdir_lock);
@@ -5802,11 +5815,13 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf)
 
         {
             l2_pgentry_t *l2t;
+            mfn_t l2mfn = l3e_get_mfn(*pl3e);
 
-            l2t = l3e_to_l2e(*pl3e);
+            l2t = map_domain_page(l2mfn);
             for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ )
                 if ( l2e_get_intpte(l2t[i]) != 0 )
                     break;
+            UNMAP_DOMAIN_PAGE(l2t);
             if ( i == L2_PAGETABLE_ENTRIES )
             {
                 /* Empty: zap the L3E and free the L2 page. */
@@ -5814,7 +5829,7 @@ int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf)
                 if ( locking )
                     spin_unlock(&map_pgdir_lock);
                 flush_area(NULL, FLUSH_TLB_GLOBAL); /* flush before free */
-                free_xen_pagetable(l2t);
+                free_xen_pagetable_new(l2mfn);
             }
             else if ( locking )
                 spin_unlock(&map_pgdir_lock);
-- 
2.23.4



  parent reply	other threads:[~2021-04-21 14:16 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21 14:15 [PATCH v10 00/13] switch to domheap for Xen page tables Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 01/13] x86/mm: rewrite virt_to_xen_l*e Hongyan Xia
2021-04-22 11:54   ` Jan Beulich
2021-04-21 14:15 ` [PATCH v10 02/13] x86/mm: switch to new APIs in map_pages_to_xen Hongyan Xia
2021-04-22 12:01   ` Jan Beulich
2021-04-21 14:15 ` Hongyan Xia [this message]
2021-04-22 13:10   ` [PATCH v10 03/13] x86/mm: switch to new APIs in modify_xen_mappings Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 04/13] x86_64/mm: introduce pl2e in paging_init Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 05/13] x86_64/mm: switch to new APIs " Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 06/13] x86_64/mm: switch to new APIs in setup_m2p_table Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 07/13] efi: use new page table APIs in copy_mapping Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 08/13] efi: switch to new APIs in EFI code Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 09/13] x86/smpboot: add exit path for clone_mapping() Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 10/13] x86/smpboot: switch clone_mapping() to new APIs Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 11/13] x86/mm: drop old page table APIs Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 12/13] x86: switch to use domheap page for page tables Hongyan Xia
2021-04-21 14:15 ` [PATCH v10 13/13] x86/mm: drop _new suffix for page table APIs Hongyan Xia
2021-04-22 16:21 ` [PATCH v10 00/13] switch to domheap for Xen page tables Andrew Cooper
2021-04-22 16:35   ` Hongyan Xia
2021-04-22 17:27     ` Julien Grall
2021-04-22 17:28     ` Andrew Cooper

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