From: Jan Beulich <jbeulich@suse.com>
Date: Tue, 29 May 2018 10:38:09 +0000 (+0200)
Subject: x86: suppress sync when XPTI is disabled for a domain
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~76
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=b7eb9d8bd61ecdc399e8fc41ea4bbff35cbe0755;p=xen.git

x86: suppress sync when XPTI is disabled for a domain

Now that we have a per-domain flag we can and should control sync-ing in
a more fine grained manner: Only domains having XPTI enabled need the
sync to occur.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Release-acked-by: Juergen Gross <jgross@suse.com>
---

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 50b5343899..2b743921c3 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -3765,7 +3765,7 @@ long do_mmu_update(
                         break;
                     rc = mod_l4_entry(va, l4e_from_intpte(req.val), mfn,
                                       cmd == MMU_PT_UPDATE_PRESERVE_AD, v);
-                    if ( !rc && !cpu_has_no_xpti )
+                    if ( !rc && pt_owner->arch.pv_domain.xpti )
                     {
                         bool local_in_use = false;