[Xen-devel] [RFC XEN PATCH 02/16] x86_64/mm: explicitly specify the location to place the M2P table

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

A reserved area on each pmem region is used to place the M2P table.
However, it's not at the beginning of the pmem region, so we need to
specify the location explicitly when creating the M2P table.

Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/x86_64/mm.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index 33f226a..5c0f527 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -317,7 +317,8 @@ void destroy_m2p_mapping(struct mem_hotadd_info *info)
  * spfn/epfn: the pfn ranges to be setup
  * free_s/free_e: the pfn ranges that is free still
  */
-static int setup_compat_m2p_table(struct mem_hotadd_info *info)
+static int setup_compat_m2p_table(struct mem_hotadd_info *info,
+                                  struct mem_hotadd_info *alloc_info)
 {
     unsigned long i, va, smap, emap, rwva, epfn = info->epfn, mfn;
     unsigned int n;
@@ -371,7 +372,7 @@ static int setup_compat_m2p_table(struct mem_hotadd_info 
*info)
         if ( n == CNT )
             continue;
 
-        mfn = alloc_hotadd_mfn(info);
+        mfn = alloc_hotadd_mfn(alloc_info);
         err = map_pages_to_xen(rwva, mfn, 1UL << PAGETABLE_ORDER,
                                PAGE_HYPERVISOR);
         if ( err )
@@ -391,7 +392,8 @@ static int setup_compat_m2p_table(struct mem_hotadd_info 
*info)
  * Allocate and map the machine-to-phys table.
  * The L3 for RO/RWRW MPT and the L2 for compatible MPT should be setup already
  */
-static int setup_m2p_table(struct mem_hotadd_info *info)
+static int setup_m2p_table(struct mem_hotadd_info *info,
+                           struct mem_hotadd_info *alloc_info)
 {
     unsigned long i, va, smap, emap;
     unsigned int n;
@@ -440,7 +442,7 @@ static int setup_m2p_table(struct mem_hotadd_info *info)
                 break;
         if ( n < CNT )
         {
-            unsigned long mfn = alloc_hotadd_mfn(info);
+            unsigned long mfn = alloc_hotadd_mfn(alloc_info);
 
             ret = map_pages_to_xen(
                         RDWR_MPT_VIRT_START + i * sizeof(unsigned long),
@@ -485,7 +487,7 @@ static int setup_m2p_table(struct mem_hotadd_info *info)
 #undef CNT
 #undef MFN
 
-    ret = setup_compat_m2p_table(info);
+    ret = setup_compat_m2p_table(info, alloc_info);
 error:
     return ret;
 }
@@ -1427,7 +1429,7 @@ int memory_add(unsigned long spfn, unsigned long epfn, 
unsigned int pxm)
     total_pages += epfn - spfn;
 
     set_pdx_range(spfn, epfn);
-    ret = setup_m2p_table(&info);
+    ret = setup_m2p_table(&info, &info);
 
     if ( ret )
         goto destroy_m2p;
-- 
2.10.1


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