[Xen-devel] [PATCH] libxc: correct max_pfn calculation for saving domain

[Juergen Gross <jgross@xxxxxxxx>]

Commit 91e204d37f44913913776d0a89279721694f8b32 ("libxc: try to find
last used pfn when migrating") introduced a bug for the case of a
domain supporting the virtual mapped linear p2m list: the maximum pfn
of the domain calculated from the p2m memory allocation might be too
low.

Correct this.

Reported-by: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
This is a backport candidate for 4.7
---
 tools/libxc/xc_sr_save_x86_pv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/libxc/xc_sr_save_x86_pv.c b/tools/libxc/xc_sr_save_x86_pv.c
index 4a29460..7043409 100644
--- a/tools/libxc/xc_sr_save_x86_pv.c
+++ b/tools/libxc/xc_sr_save_x86_pv.c
@@ -430,6 +430,8 @@ static int map_p2m_list(struct xc_sr_context *ctx, uint64_t 
p2m_cr3)
 
         if ( level == 2 )
         {
+            if ( saved_idx == idx_end )
+                saved_idx++;
             max_pfn = ((xen_pfn_t)saved_idx << 9) * fpp - 1;
             if ( max_pfn < ctx->x86_pv.max_pfn )
             {
-- 
2.6.6


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