[PATCH v3 4/4] mini-os: fix bug in ballooning on PVH

[Juergen Gross <jgross@xxxxxxxx>]

There is a subtle bug in ballooning code for PVH: in case ballooning
extends above a non-RAM area of the memory map, wrong pages will be
used.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
---
V2:
- new patch
---
 balloon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/balloon.c b/balloon.c
index 6ad07644..55be8141 100644
--- a/balloon.c
+++ b/balloon.c
@@ -124,7 +124,7 @@ int balloon_up(unsigned long n_pages)
     for ( pfn = 0; pfn < rc; pfn++ )
     {
         arch_pfn_add(start_pfn + pfn, balloon_frames[pfn]);
-        free_page(pfn_to_virt(nr_mem_pages + pfn));
+        free_page(pfn_to_virt(start_pfn + pfn));
     }
 
     nr_mem_pages += rc;
-- 
2.35.3