From: Paul Durrant <paul@xen.org>
Date: Tue, 24 Mar 2020 16:40:09 +0000 (+0100)
Subject: x86 / ioreq: use a MEMF_no_refcount allocation for server pages...
X-Git-Tag: archive/raspbian/4.14.0+80-gd101b417b7-1+rpi1^2~63^2~509
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=0a393d881f27ecddd7be762ba24951d6cb67751d;p=xen.git

x86 / ioreq: use a MEMF_no_refcount allocation for server pages...

... now that it is safe to assign them.

This avoids relying on libxl (or whatever toolstack is in use) setting
max_pages up with sufficient 'slop' to allow all necessary ioreq server
pages to be allocated.

Signed-off-by: Paul Durrant <paul@xen.org>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---

diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
index 36fbbcf0ea..70e61788d7 100644
--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -376,7 +376,7 @@ static int hvm_alloc_ioreq_mfn(struct hvm_ioreq_server *s, bool buf)
         return 0;
     }
 
-    page = alloc_domheap_page(s->target, 0);
+    page = alloc_domheap_page(s->target, MEMF_no_refcount);
 
     if ( !page )
         return -ENOMEM;