[Xen-changelog] [xen-unstable] [IA64] Support grant_table v2 for XENMAPSPACE_grant_table

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1266833290 0
# Node ID 94e009ef5a58c02d4fe78fcc4c85627b469ee937
# Parent  70d974c2401d2f44cb0a7b2e34f8f20c267c433f
[IA64] Support grant_table v2 for XENMAPSPACE_grant_table

This patch is ia64 counter part of 20281:95ea2052b41b.
This fixes the issue that HVM domains with PV-on-HVM drivers panic.

Signed-off-by: KUWAMURA Shin'ya <kuwa@xxxxxxxxxxxxxx>
---
 xen/arch/ia64/xen/mm.c |   25 +++++++++++++++++++------
 1 files changed, 19 insertions(+), 6 deletions(-)

diff -r 70d974c2401d -r 94e009ef5a58 xen/arch/ia64/xen/mm.c
--- a/xen/arch/ia64/xen/mm.c    Mon Feb 22 10:07:27 2010 +0000
+++ b/xen/arch/ia64/xen/mm.c    Mon Feb 22 10:08:10 2010 +0000
@@ -3338,12 +3338,25 @@ arch_memory_op(int op, XEN_GUEST_HANDLE(
         case XENMAPSPACE_grant_table:
             spin_lock(&d->grant_table->lock);
 
-            if ((xatp.idx >= nr_grant_frames(d->grant_table)) &&
-                (xatp.idx < max_nr_grant_frames))
-                gnttab_grow_table(d, xatp.idx + 1);
-
-            if (xatp.idx < nr_grant_frames(d->grant_table))
-                mfn = virt_to_mfn(d->grant_table->shared_raw[xatp.idx]);
+            if (d->grant_table->gt_version == 0)
+                d->grant_table->gt_version = 1;
+
+            if (d->grant_table->gt_version == 2 &&
+                (xatp.idx & XENMAPIDX_grant_table_status))
+            {
+                xatp.idx &= ~XENMAPIDX_grant_table_status;
+                if (xatp.idx < nr_status_frames(d->grant_table))
+                    mfn = virt_to_mfn(d->grant_table->status[xatp.idx]);
+            }
+            else
+            {
+                if ((xatp.idx >= nr_grant_frames(d->grant_table)) &&
+                    (xatp.idx < max_nr_grant_frames))
+                    gnttab_grow_table(d, xatp.idx + 1);
+
+                if (xatp.idx < nr_grant_frames(d->grant_table))
+                    mfn = virt_to_mfn(d->grant_table->shared_raw[xatp.idx]);
+            }
 
             spin_unlock(&d->grant_table->lock);
             break;

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