[Xen-devel] [PATCH V2 1/4] xen: arm: rename xen_pgtable to boot_pgtable

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

The intention is that in a subsequent patch each PCPU will have its own
pagetables and that xen_pgtable will become a per-cpu variable. The boot
pagetables will become the boot cpu's pagetables.

For now leave a #define in place for those places which semantically do mean
xen_pgtable and not boot_pgtable.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/arm32/head.S |    2 +-
 xen/arch/arm/arm64/head.S |    4 ++--
 xen/arch/arm/mm.c         |   18 +++++++++++-------
 3 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S
index f2f581d..0b4cfde 100644
--- a/xen/arch/arm/arm32/head.S
+++ b/xen/arch/arm/arm32/head.S
@@ -206,7 +206,7 @@ skip_bss:
         mcr   CP32(r0, HSCTLR)
 
         /* Write Xen's PT's paddr into the HTTBR */
-        ldr   r4, =xen_pgtable
+        ldr   r4, =boot_pgtable
         add   r4, r4, r10            /* r4 := paddr (xen_pagetable) */
         mov   r5, #0                 /* r4:r5 is paddr (xen_pagetable) */
         mcrr  CP64(r4, r5, HTTBR)
diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index c18ef2b..f0d9066 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -190,14 +190,14 @@ skip_bss:
         msr   SCTLR_EL2, x0
 
         /* Write Xen's PT's paddr into the HTTBR */
-        ldr   x4, =xen_pgtable
+        ldr   x4, =boot_pgtable
         add   x4, x4, x20            /* x4 := paddr (xen_pagetable) */
         msr   TTBR0_EL2, x4
 
         /* Non-boot CPUs don't need to rebuild the pagetable */
         cbnz  x22, pt_ready
 
-        ldr   x1, =xen_first
+        ldr   x1, =boot_first
         add   x1, x1, x20            /* x1 := paddr (xen_first) */
         mov   x3, #PT_PT             /* x2 := table map of xen_first */
         orr   x2, x1, x3             /* (+ rights for linear PT) */
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index ba3140d..3cb852b 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -40,10 +40,10 @@
 struct domain *dom_xen, *dom_io, *dom_cow;
 
 /* Static start-of-day pagetables that we use before the allocators are up */
-/* xen_pgtable == root of the trie (zeroeth level on 64-bit, first on 32-bit) 
*/
-lpae_t xen_pgtable[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
+/* boot_pgtable == root of the trie (zeroeth level on 64-bit, first on 32-bit) 
*/
+lpae_t boot_pgtable[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
 #ifdef CONFIG_ARM_64
-lpae_t xen_first[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
+lpae_t boot_first[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
 #endif
 /* N.B. The second-level table is 4 contiguous pages long, and covers
  * all addresses from 0 to 0xffffffff.  Offsets into it are calculated
@@ -52,6 +52,10 @@ lpae_t xen_second[LPAE_ENTRIES*4] 
__attribute__((__aligned__(4096*4)));
 lpae_t xen_fixmap[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
 static lpae_t xen_xenmap[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
 
+/* boot_pgtable becomes the boot processors pagetable, eventually this will
+ * become a per-cpu variable */
+#define xen_pgtable boot_pgtable
+
 /* Non-boot CPUs use this to find the correct pagetables. */
 uint64_t boot_ttbr;
 
@@ -284,11 +288,11 @@ void __init setup_pagetables(unsigned long 
boot_phys_offset, paddr_t xen_paddr)
     /* Beware!  Any state we modify between now and the PT switch may be
      * discarded when we switch over to the copy. */
 
-    /* Update the copy of xen_pgtable to use the new paddrs */
-    p = (void *) xen_pgtable + dest_va - (unsigned long) _start;
+    /* Update the copy of boot_pgtable to use the new paddrs */
+    p = (void *) boot_pgtable + dest_va - (unsigned long) _start;
 #ifdef CONFIG_ARM_64
     p[0].pt.base += (phys_offset - boot_phys_offset) >> PAGE_SHIFT;
-    p = (void *) xen_first + dest_va - (unsigned long) _start;
+    p = (void *) boot_first + dest_va - (unsigned long) _start;
 #endif
     for ( i = 0; i < 4; i++)
         p[i].pt.base += (phys_offset - boot_phys_offset) >> PAGE_SHIFT;
@@ -305,7 +309,7 @@ void __init setup_pagetables(unsigned long 
boot_phys_offset, paddr_t xen_paddr)
             p[i].pt.base += (phys_offset - boot_phys_offset) >> PAGE_SHIFT;
 
     /* Change pagetables to the copy in the relocated Xen */
-    boot_ttbr = (uintptr_t) xen_pgtable + phys_offset;
+    boot_ttbr = (uintptr_t) boot_pgtable + phys_offset;
     flush_xen_dcache(boot_ttbr);
     flush_xen_dcache_va_range((void*)dest_va, _end - _start);
     flush_xen_text_tlb();
-- 
1.7.2.5


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