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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 04/13] x86_64/mm: introduce pl2e in paging_init
Date: Wed, 21 Apr 2021 15:15:32 +0100	[thread overview]
Message-ID: <0a457a23e38ea09a7a62722b44a1a5f47f6cab3b.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>

We will soon map and unmap pages in paging_init(). Introduce pl2e so
that we can use l2_ro_mpt to point to the page table itself.

No functional change.

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

---
Changed in v7:
- reword commit message.
---
 xen/arch/x86/x86_64/mm.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index d7e67311fa69..59049bdf8e83 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -496,7 +496,7 @@ void __init paging_init(void)
     unsigned long i, mpt_size, va;
     unsigned int n, memflags;
     l3_pgentry_t *l3_ro_mpt;
-    l2_pgentry_t *l2_ro_mpt = NULL;
+    l2_pgentry_t *pl2e = NULL, *l2_ro_mpt = NULL;
     struct page_info *l1_pg;
 
     /*
@@ -546,7 +546,7 @@ void __init paging_init(void)
             (L2_PAGETABLE_SHIFT - 3 + PAGE_SHIFT)));
 
         if ( cpu_has_page1gb &&
-             !((unsigned long)l2_ro_mpt & ~PAGE_MASK) &&
+             !((unsigned long)pl2e & ~PAGE_MASK) &&
              (mpt_size >> L3_PAGETABLE_SHIFT) > (i >> PAGETABLE_ORDER) )
         {
             unsigned int k, holes;
@@ -606,7 +606,7 @@ void __init paging_init(void)
             memset((void *)(RDWR_MPT_VIRT_START + (i << L2_PAGETABLE_SHIFT)),
                    0xFF, 1UL << L2_PAGETABLE_SHIFT);
         }
-        if ( !((unsigned long)l2_ro_mpt & ~PAGE_MASK) )
+        if ( !((unsigned long)pl2e & ~PAGE_MASK) )
         {
             if ( (l2_ro_mpt = alloc_xen_pagetable()) == NULL )
                 goto nomem;
@@ -614,13 +614,14 @@ void __init paging_init(void)
             l3e_write(&l3_ro_mpt[l3_table_offset(va)],
                       l3e_from_paddr(__pa(l2_ro_mpt),
                                      __PAGE_HYPERVISOR_RO | _PAGE_USER));
+            pl2e = l2_ro_mpt;
             ASSERT(!l2_table_offset(va));
         }
         /* NB. Cannot be GLOBAL: guest user mode should not see it. */
         if ( l1_pg )
-            l2e_write(l2_ro_mpt, l2e_from_page(
+            l2e_write(pl2e, l2e_from_page(
                 l1_pg, /*_PAGE_GLOBAL|*/_PAGE_PSE|_PAGE_USER|_PAGE_PRESENT));
-        l2_ro_mpt++;
+        pl2e++;
     }
 #undef CNT
 #undef MFN
@@ -632,6 +633,7 @@ void __init paging_init(void)
             goto nomem;
         compat_idle_pg_table_l2 = l2_ro_mpt;
         clear_page(l2_ro_mpt);
+        pl2e = l2_ro_mpt;
 
         /* Allocate and map the compatibility mode machine-to-phys table. */
         mpt_size = (mpt_size >> 1) + (1UL << (L2_PAGETABLE_SHIFT - 1));
@@ -649,7 +651,7 @@ void __init paging_init(void)
              sizeof(*compat_machine_to_phys_mapping))
     BUILD_BUG_ON((sizeof(*frame_table) & ~sizeof(*frame_table)) % \
                  sizeof(*compat_machine_to_phys_mapping));
-    for ( i = 0; i < (mpt_size >> L2_PAGETABLE_SHIFT); i++, l2_ro_mpt++ )
+    for ( i = 0; i < (mpt_size >> L2_PAGETABLE_SHIFT); i++, pl2e++ )
     {
         memflags = MEMF_node(phys_to_nid(i <<
             (L2_PAGETABLE_SHIFT - 2 + PAGE_SHIFT)));
@@ -671,7 +673,7 @@ void __init paging_init(void)
                         (i << L2_PAGETABLE_SHIFT)),
                0xFF, 1UL << L2_PAGETABLE_SHIFT);
         /* NB. Cannot be GLOBAL as the ptes get copied into per-VM space. */
-        l2e_write(l2_ro_mpt, l2e_from_page(l1_pg, _PAGE_PSE|_PAGE_PRESENT));
+        l2e_write(pl2e, l2e_from_page(l1_pg, _PAGE_PSE|_PAGE_PRESENT));
     }
 #undef CNT
 #undef MFN
-- 
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 ` [PATCH v10 03/13] x86/mm: switch to new APIs in modify_xen_mappings Hongyan Xia
2021-04-22 13:10   ` Hongyan Xia
2021-04-21 14:15 ` Hongyan Xia [this message]
2021-04-21 14:15 ` [PATCH v10 05/13] x86_64/mm: switch to new APIs in paging_init 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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