[Xen-devel] [PATCH] x86/shim: fix ballooning down the guest

[Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>]

Currently ballooning down a pvshim guest causes the following errors
inside the shim:

    d3v0 failed to reserve 512 extents of order 512 for offlining

And the ballooned-out pages stay inside shim and don't reach L0 Xen.

Fix this by passing the correct arguments to pv_shim_offline_memory()
during a XENMEM_decrease_reservation request.

Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
---
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/common/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/common/memory.c b/xen/common/memory.c
index 7364fd2c33..309e872edf 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -1225,7 +1225,7 @@ long do_memory_op(unsigned long cmd, 
XEN_GUEST_HANDLE_PARAM(void) arg)
              * hypercall has failed and only part of the extents where
              * processed.
              */
-            pv_shim_offline_memory(args.nr_extents, args.nr_done);
+            pv_shim_offline_memory(args.nr_done, args.extent_order);
 #endif
 
         break;
-- 
2.17.1


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