[PATCH] x86/altp2m: don't consider "active" when enabling failed

[Jan Beulich]

We should not rely on guests to not use altp2m after reporting failure
of HVMOP_altp2m_set_domain_state to them. Set "active" back to false in
this case.

Signed-off-by: Jan Beulich <jbeul...@suse.com>

--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -4609,6 +4609,8 @@ static int do_altp2m_op(
             if ( ostate )
                 p2m_flush_altp2m(d);
         }
+        else if ( rc )
+            d->arch.altp2m_active = false;
 
         domain_unpause_except_self(d);
         break;