[Xen-devel] [PATCH-v2] xen: populate correct number of pages when across mem boundary

["zhenzhong.duan" <zhenzhong.duan@oracle.com>]

 From c40ea05842fec8f6caa053b2d58f54608ed0835f Mon Sep 17 00:00:00 2001
From: Zhenzhong Duan<zhenzhong.duan@oracle.com>
Date: Wed, 4 Jul 2012 14:08:10 +0800
Subject: [PATCH] xen: populate right count of pages when across mem boundary

When populate pages across a mem boundary at bootup, the page count
populated isn't correct. This is due to mem populated to non-mem
region and ignored.

Pfn range is also wrongly aligned when mem boundary isn't page aligned.

-v2: If xen_do_chunk fail(populate), abort this chunk and any others.
Suggested by David, thanks.

For a dom0 booted with dom_mem=3368952K(0xcd9ff000-4k) dmesg diff is:
  [    0.000000] Freeing 9e-100 pfn range: 98 pages freed
  [    0.000000] 1-1 mapping on 9e->100
  [    0.000000] 1-1 mapping on cd9ff->100000
  [    0.000000] Released 98 pages of unused memory
  [    0.000000] Set 206435 page(s) to 1-1 mapping
-[    0.000000] Populating cd9fe-cda00 pfn range: 1 pages added
+[    0.000000] Populating cd9fe-cd9ff pfn range: 1 pages added
+[    0.000000] Populating 100000-100061 pfn range: 97 pages added
  [    0.000000] BIOS-provided physical RAM map:
  [    0.000000] Xen: 0000000000000000 - 000000000009e000 (usable)
  [    0.000000] Xen: 00000000000a0000 - 0000000000100000 (reserved)
  [    0.000000] Xen: 0000000000100000 - 00000000cd9ff000 (usable)
  [    0.000000] Xen: 00000000cd9ffc00 - 00000000cda53c00 (ACPI NVS)
...
  [    0.000000] Xen: 0000000100000000 - 0000000100061000 (usable)
  [    0.000000] Xen: 0000000100061000 - 000000012c000000 (unusable)
...
  [    0.000000] MEMBLOCK configuration:
...
-[    0.000000]  reserved[0x4]       [0x000000cd9ff000-0x000000cd9ffbff], 0xc00 bytes
-[    0.000000]  reserved[0x5]       [0x00000100000000-0x00000100060fff], 0x61000 bytes

Related xen memory layout:
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009ec00 (usable)
(XEN)  00000000000f0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 00000000cd9ffc00 (usable)

Signed-off-by: Zhenzhong Duan<zhenzhong.duan@oracle.com>
---
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index a4790bf..ead8557 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -157,25 +157,24 @@ static unsigned long __init xen_populate_chunk(
  	unsigned long dest_pfn;

  	for (i = 0, entry = list; i<  map_size; i++, entry++) {
-		unsigned long credits = credits_left;
  		unsigned long s_pfn;
  		unsigned long e_pfn;
  		unsigned long pfns;
  		long capacity;

-		if (credits<= 0)
+		if (credits_left<= 0)
  			break;

  		if (entry->type != E820_RAM)
  			continue;

-		e_pfn = PFN_UP(entry->addr + entry->size);
+		e_pfn = PFN_DOWN(entry->addr + entry->size);

  		/* We only care about E820 after the xen_start_info->nr_pages */
  		if (e_pfn<= max_pfn)
  			continue;

-		s_pfn = PFN_DOWN(entry->addr);
+		s_pfn = PFN_UP(entry->addr);
  		/* If the E820 falls within the nr_pages, we want to start
  		 * at the nr_pages PFN.
  		 * If that would mean going past the E820 entry, skip it
@@ -184,23 +183,19 @@ static unsigned long __init xen_populate_chunk(
  			capacity = e_pfn - max_pfn;
  			dest_pfn = max_pfn;
  		} else {
-			/* last_pfn MUST be within E820_RAM regions */
-			if (*last_pfn&&  e_pfn>= *last_pfn)
-				s_pfn = *last_pfn;
  			capacity = e_pfn - s_pfn;
  			dest_pfn = s_pfn;
  		}
-		/* If we had filled this E820_RAM entry, go to the next one. */
-		if (capacity<= 0)
-			continue;

-		if (credits>  capacity)
-			credits = capacity;
+		if (credits_left<  capacity)
+			capacity = credits_left;

-		pfns = xen_do_chunk(dest_pfn, dest_pfn + credits, false);
+		pfns = xen_do_chunk(dest_pfn, dest_pfn + capacity, false);
  		done += pfns;
-		credits_left -= pfns;
  		*last_pfn = (dest_pfn + pfns);
+		if (pfns<  capacity)
+			break;
+		credits_left -= pfns;
  	}
  	return done;
  }
-- 
1.7.3