[xen staging] tools/libs/guest: fix max_pfn setting in map_p2m()

[patchbot@xxxxxxx]

commit 7bd8989ab77b6ade3b7a5f4b640a55248d1791a3
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Fri Jun 4 08:02:09 2021 +0200
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Fri Jun 4 18:56:46 2021 +0100

    tools/libs/guest: fix max_pfn setting in map_p2m()
    
    When setting the highest pfn used in the guest, don't subtract 1 from
    the value read from the shared_info data. The value read already is
    the correct pfn.
    
    Fixes: 91e204d37f449 ("libxc: try to find last used pfn when migrating")
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Acked-by: Wei Liu <wl@xxxxxxx>
---
 tools/libs/guest/xg_sr_save_x86_pv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/libs/guest/xg_sr_save_x86_pv.c 
b/tools/libs/guest/xg_sr_save_x86_pv.c
index 4964f1f7b8..dae7f2817f 100644
--- a/tools/libs/guest/xg_sr_save_x86_pv.c
+++ b/tools/libs/guest/xg_sr_save_x86_pv.c
@@ -468,7 +468,7 @@ static int map_p2m(struct xc_sr_context *ctx)
 
     ctx->x86.pv.p2m_generation = ~0ULL;
     ctx->x86.pv.max_pfn = GET_FIELD(ctx->x86.pv.shinfo, arch.max_pfn,
-                                    ctx->x86.pv.width) - 1;
+                                    ctx->x86.pv.width);
     p2m_cr3 = GET_FIELD(ctx->x86.pv.shinfo, arch.p2m_cr3, ctx->x86.pv.width);
 
     return p2m_cr3 ? map_p2m_list(ctx, p2m_cr3) : map_p2m_tree(ctx);
--
generated by git-patchbot for /home/xen/git/xen.git#staging