[Xen-changelog] [xen-4.0-testing] Fix IOAPIC S3 with interrupt remapping enabled

["Xen patchbot-4.0-testing" <patchbot-4.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1281708384 -3600
# Node ID 5e8df2d2ef6fd17be339d5a2febe1576be8bab82
# Parent  43f1fce90ffae4bef48ef8bdee066a183480d5ff
Fix IOAPIC S3 with interrupt remapping enabled

In ioapic_suspend, it reads and saves ioapic RTEs. But when interrupt
remapping is enabled, io_apic_read will call io_apic_read_remap_rte to
convert remapped format interrupt to compatible format, this results
in 'dest' field may be changed in remap_entry_to_ioapic_rte. When in
ioapic_resume, it will write the saved RTEs with incorrect 'dest' to
interrupt remapping table.

Actually it needn't to convert RTEs regardless interrupt remapping is
enabled or not. It just needs to save and restore RTE values
directly. This patch just uses __io_apic_read and __io_apic_write,
which won't call Interrupt remapping functions to convert, to save and
restore RTEs in ioapic_suspend and ioapic_resume. Thus fix this issue.

Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
xen-unstable changeset:   01d185dab39e
xen-unstable date:        Fri Aug 13 14:57:35 2010 +0100
---
 xen/arch/x86/io_apic.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff -r 43f1fce90ffa -r 5e8df2d2ef6f xen/arch/x86/io_apic.c
--- a/xen/arch/x86/io_apic.c    Fri Aug 13 09:25:46 2010 +0100
+++ b/xen/arch/x86/io_apic.c    Fri Aug 13 15:06:24 2010 +0100
@@ -2093,8 +2093,8 @@ void ioapic_suspend(void)
     spin_lock_irqsave(&ioapic_lock, flags);
     for (apic = 0; apic < nr_ioapics; apic++) {
         for (i = 0; i < nr_ioapic_registers[apic]; i ++, entry ++ ) {
-            *(((int *)entry) + 1) = io_apic_read(apic, 0x11 + 2 * i);
-            *(((int *)entry) + 0) = io_apic_read(apic, 0x10 + 2 * i);
+            *(((int *)entry) + 1) = __io_apic_read(apic, 0x11 + 2 * i);
+            *(((int *)entry) + 0) = __io_apic_read(apic, 0x10 + 2 * i);
         }
     }
     spin_unlock_irqrestore(&ioapic_lock, flags);
@@ -2109,14 +2109,14 @@ void ioapic_resume(void)
 
     spin_lock_irqsave(&ioapic_lock, flags);
     for (apic = 0; apic < nr_ioapics; apic++){
-        reg_00.raw = io_apic_read(apic, 0);
+        reg_00.raw = __io_apic_read(apic, 0);
         if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid) {
             reg_00.bits.ID = mp_ioapics[apic].mpc_apicid;
-            io_apic_write(apic, 0, reg_00.raw);
+            __io_apic_write(apic, 0, reg_00.raw);
         }
         for (i = 0; i < nr_ioapic_registers[apic]; i++, entry++) {
-            io_apic_write(apic, 0x11+2*i, *(((int *)entry)+1));
-            io_apic_write(apic, 0x10+2*i, *(((int *)entry)+0));
+            __io_apic_write(apic, 0x11+2*i, *(((int *)entry)+1));
+            __io_apic_write(apic, 0x10+2*i, *(((int *)entry)+0));
         }
     }
     spin_unlock_irqrestore(&ioapic_lock, flags);

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog