[Xen-changelog] [xen-unstable] [IA64] Mask out reserved bits to avoid Reserved Register/Field faults.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User awilliam@xxxxxxxxxxxx
# Date 1166461489 25200
# Node ID 893b786cc66ae67bf761fbe1ff814435dae30210
# Parent  cf23494af72cd6c385d7607ee048253bfd9da2f6
[IA64] Mask out reserved bits to avoid Reserved Register/Field faults.

Signed-off-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>
---
 xen/arch/ia64/xen/vcpu.c                     |    1 +
 xen/include/asm-ia64/linux-xen/asm/pgtable.h |    5 +++++
 2 files changed, 6 insertions(+)

diff -r cf23494af72c -r 893b786cc66a xen/arch/ia64/xen/vcpu.c
--- a/xen/arch/ia64/xen/vcpu.c  Mon Dec 18 09:48:23 2006 -0700
+++ b/xen/arch/ia64/xen/vcpu.c  Mon Dec 18 10:04:49 2006 -0700
@@ -2162,6 +2162,7 @@ vcpu_itc_no_srlz(VCPU * vcpu, u64 IorD, 
        BUG_ON(logps > PAGE_SHIFT);
        vcpu_tlb_track_insert_or_dirty(vcpu, vaddr, entry);
        psr = ia64_clear_ic();
+       pte &= ~(_PAGE_RV2 | _PAGE_RV1);        // Mask out the reserved bits.
        ia64_itc(IorD, vaddr, pte, ps); // FIXME: look for bigger mappings
        ia64_set_psr(psr);
        // ia64_srlz_i(); // no srls req'd, will rfi later
diff -r cf23494af72c -r 893b786cc66a 
xen/include/asm-ia64/linux-xen/asm/pgtable.h
--- a/xen/include/asm-ia64/linux-xen/asm/pgtable.h      Mon Dec 18 09:48:23 
2006 -0700
+++ b/xen/include/asm-ia64/linux-xen/asm/pgtable.h      Mon Dec 18 10:04:49 
2006 -0700
@@ -39,6 +39,11 @@
 #define _PAGE_P                        (1 << _PAGE_P_BIT)      /* page present 
bit */
 #define _PAGE_MA_WB            (0x0 <<  2)     /* write back memory attribute 
*/
 #ifdef XEN
+#define _PAGE_RV1_BIT          1
+#define _PAGE_RV2_BIT          50
+#define _PAGE_RV1              (__IA64_UL(1) << _PAGE_RV1_BIT) /* reserved bit 
*/
+#define _PAGE_RV2              (__IA64_UL(3) << _PAGE_RV2_BIT) /* reserved 
bits */
+
 #define _PAGE_MA_ST            (0x1 <<  2)     /* is reserved for software use 
*/
 #endif
 #define _PAGE_MA_UC            (0x4 <<  2)     /* uncacheable memory attribute 
*/

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