From: Alex Williamson <alex.williamson@hp.com>
Date: Fri, 30 Mar 2007 16:27:15 +0000 (-0600)
Subject: [IA64] Avoid insertion of pte.ma=001 into VHPT
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~15272
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https:/%22bookmarks:/%22man:///%22http:/www.example.com/cgi/%22https:/%22bookmarks:/%22man:/?a=commitdiff_plain;h=260e4d9ab374955ae3189dc9f22692fa3a85fd09;p=xen.git

[IA64] Avoid insertion of pte.ma=001 into VHPT

A TLB entry shouldn't be inserted into VHPT when its memory
attribute field is 001 "software reserved".

Without this patch, a TLB fault expected by a guest OS is missing.

Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>
---

diff --git a/xen/arch/ia64/vmx/vmx_process.c b/xen/arch/ia64/vmx/vmx_process.c
index 4ee7d4e805..ee811ba777 100644
--- a/xen/arch/ia64/vmx/vmx_process.c
+++ b/xen/arch/ia64/vmx/vmx_process.c
@@ -437,6 +437,11 @@ vmx_hpw_miss(u64 vadr , u64 vec, REGS* regs)
         if (!guest_vhpt_lookup(vhpt_adr, &pteval)) {
             /* VHPT successfully read.  */
             if (pteval & _PAGE_P) {
+                if ((pteval & _PAGE_MA_MASK) == _PAGE_MA_ST) {
+                    vcpu_set_isr(v, misr.val);
+                    itlb_fault(v, vadr);
+                    return IA64_FAULT;
+                }
                 vcpu_get_rr(v, vadr, &rr);
                 itir = rr & (RR_RID_MASK | RR_PS_MASK);
                 thash_purge_and_insert(v, pteval, itir, vadr, ISIDE_TLB);