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* [PATCH] xen: populate correct number of pages when across mem boundary
@ 2012-07-04  6:49 zhenzhong.duan
  2012-07-12 14:55 ` David Vrabel
  2012-07-12 14:55 ` [Xen-devel] [PATCH] " David Vrabel
  0 siblings, 2 replies; 15+ messages in thread
From: zhenzhong.duan @ 2012-07-04  6:49 UTC (permalink / raw)
  To: Konrad Rzeszutek Wilk, jeremy, tglx, mingo, hpa, xen-devel
  Cc: x86, virtualization, linux-kernel, Feng Jin

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.

Also need consider the rare case when xen_do_chunk fail(populate).

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>
---
 arch/x86/xen/setup.c |   24 +++++++++++-------------
 1 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index a4790bf..bd78773 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -157,50 +157,48 @@ 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
 		 */
+again:
 		if (s_pfn <= max_pfn) {
 			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 (credits_left > 0 && *last_pfn < e_pfn) {
+			s_pfn = *last_pfn;
+			goto again;
+		}
 	}
 	return done;
 }
-- 
1.7.3


^ permalink raw reply related	[flat|nested] 15+ messages in thread

end of thread, other threads:[~2012-07-18  4:40 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-07-04  6:49 [PATCH] xen: populate correct number of pages when across mem boundary zhenzhong.duan
2012-07-12 14:55 ` David Vrabel
2012-07-13  5:37   ` [Xen-devel] " zhenzhong.duan
2012-07-13  5:37     ` zhenzhong.duan
2012-07-13  8:31   ` [Xen-devel] [PATCH-v2] " zhenzhong.duan
2012-07-13  8:31     ` zhenzhong.duan
2012-07-17 14:45     ` Konrad Rzeszutek Wilk
2012-07-17 14:45       ` Konrad Rzeszutek Wilk
2012-07-18  2:48       ` [Xen-devel] [PATCH -v2] " zhenzhong.duan
2012-07-18  2:48         ` zhenzhong.duan
2012-07-18  3:08       ` [Xen-devel] [PATCH-v2] " zhenzhong.duan
2012-07-18  3:08         ` zhenzhong.duan
2012-07-18  4:40         ` zhenzhong.duan
2012-07-18  4:40           ` zhenzhong.duan
2012-07-12 14:55 ` [Xen-devel] [PATCH] " David Vrabel

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