[Xen-changelog] [xen-3.1-testing] [IA64] Fix wrong insertion of TLB entry in region 0

["Xen patchbot-3.1-testing" <patchbot-3.1-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1197031537 0
# Node ID 1301c84728aa7bd4724f48fcb1f1fd6bb7146953
# Parent  d9e801579619734825a3e3392fe21aa54001f117
[IA64] Fix wrong insertion of TLB entry in region 0

On PV domain with metaphysical mode, emulation of itc.d in region 0
doesn't work well and inserts an wrong TC entry.
Because set_one_rr() doesn't set the machine region register.
i.e. metaphyisical_rr0 is used instead of guest's rr[0].

This bug causes Dom0/U crash when an application uses region 0.
Actually I met the crash when I was building open GFW (java uses
region 0).

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>
xen-unstable changeset: 16042:2d1b8ae1548d139f9f8532c90a1e61fc199a3394
xen-unstable date: Mon Oct 01 09:57:50 2007 -0600
---
 xen/arch/ia64/xen/regionreg.c    |   11 +++++++++--
 xen/arch/ia64/xen/vcpu.c         |   10 +++++-----
 xen/include/asm-ia64/regionreg.h |    3 ++-
 3 files changed, 16 insertions(+), 8 deletions(-)

diff -r d9e801579619 -r 1301c84728aa xen/arch/ia64/xen/regionreg.c
--- a/xen/arch/ia64/xen/regionreg.c     Fri Dec 07 00:55:00 2007 +0000
+++ b/xen/arch/ia64/xen/regionreg.c     Fri Dec 07 12:45:37 2007 +0000
@@ -270,8 +270,16 @@ int set_one_rr(unsigned long rr, unsigne
        return 1;
 }
 
+void set_virtual_rr0(void)
+{
+       struct vcpu *v = current;
+
+       ia64_set_rr(0, v->arch.metaphysical_saved_rr0);
+       ia64_srlz_d();
+}
+
 // set rr0 to the passed rid (for metaphysical mode so don't use domain offset
-int set_metaphysical_rr0(void)
+void set_metaphysical_rr0(void)
 {
        struct vcpu *v = current;
 //     ia64_rr rrv;
@@ -279,7 +287,6 @@ int set_metaphysical_rr0(void)
 //     rrv.ve = 1;     FIXME: TURN ME BACK ON WHEN VHPT IS WORKING
        ia64_set_rr(0,v->arch.metaphysical_rr0);
        ia64_srlz_d();
-       return 1;
 }
 
 void init_all_rr(struct vcpu *v)
diff -r d9e801579619 -r 1301c84728aa xen/arch/ia64/xen/vcpu.c
--- a/xen/arch/ia64/xen/vcpu.c  Fri Dec 07 00:55:00 2007 +0000
+++ b/xen/arch/ia64/xen/vcpu.c  Fri Dec 07 12:45:37 2007 +0000
@@ -234,7 +234,7 @@ IA64FAULT vcpu_get_ar(VCPU * vcpu, u64 r
  VCPU processor status register access routines
 **************************************************************************/
 
-void vcpu_set_metaphysical_mode(VCPU * vcpu, BOOLEAN newmode)
+static void vcpu_set_metaphysical_mode(VCPU * vcpu, BOOLEAN newmode)
 {
        /* only do something if mode changes */
        if (!!newmode ^ !!PSCB(vcpu, metaphysical_mode)) {
@@ -242,7 +242,7 @@ void vcpu_set_metaphysical_mode(VCPU * v
                if (newmode)
                        set_metaphysical_rr0();
                else if (PSCB(vcpu, rrs[0]) != -1)
-                       set_one_rr(0, PSCB(vcpu, rrs[0]));
+                       set_virtual_rr0();
        }
 }
 
@@ -1556,7 +1556,7 @@ vcpu_get_domain_bundle(VCPU * vcpu, REGS
                // This may cause tlb miss. see vcpu_translate(). Be careful!
                swap_rr0 = (!region && PSCB(vcpu, metaphysical_mode));
                if (swap_rr0) {
-                       set_one_rr(0x0, PSCB(vcpu, rrs[0]));
+                       set_virtual_rr0();
                }
                *bundle = __get_domain_bundle(gip);
                if (swap_rr0) {
@@ -2203,7 +2203,7 @@ IA64FAULT vcpu_itc_d(VCPU * vcpu, u64 pt
        if (!pteval)
                return IA64_ILLOP_FAULT;
        if (swap_rr0)
-               set_one_rr(0x0, PSCB(vcpu, rrs[0]));
+               set_virtual_rr0();
        vcpu_itc_no_srlz(vcpu, 2, ifa, pteval, pte, logps, &entry);
        if (swap_rr0)
                set_metaphysical_rr0();
@@ -2230,7 +2230,7 @@ IA64FAULT vcpu_itc_i(VCPU * vcpu, u64 pt
        if (!pteval)
                return IA64_ILLOP_FAULT;
        if (swap_rr0)
-               set_one_rr(0x0, PSCB(vcpu, rrs[0]));
+               set_virtual_rr0();
        vcpu_itc_no_srlz(vcpu, 1, ifa, pteval, pte, logps, &entry);
        if (swap_rr0)
                set_metaphysical_rr0();
diff -r d9e801579619 -r 1301c84728aa xen/include/asm-ia64/regionreg.h
--- a/xen/include/asm-ia64/regionreg.h  Fri Dec 07 00:55:00 2007 +0000
+++ b/xen/include/asm-ia64/regionreg.h  Fri Dec 07 12:45:37 2007 +0000
@@ -76,7 +76,8 @@ struct vcpu;
 struct vcpu;
 extern void init_all_rr(struct vcpu *v);
 
-extern int set_metaphysical_rr0(void);
+extern void set_virtual_rr0(void);
+extern void set_metaphysical_rr0(void);
 
 extern void load_region_regs(struct vcpu *v);
 

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