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Subject[patch 09/16] Program check in diag 210 under 31 bit
From: Michael Holzheu <holzheu@de.ibm.com>

If a virtual address is passed to the diag210 function under 31 bit, we get a
programming exception, since diag 210 only works with physical addresses. To
fix this, the content of the diag210 data structure is copied to a local
structure and the physical address of that structure is passed to diagnose 210.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
drivers/s390/cio/device_id.c | 22 +++++++---------------
1 file changed, 7 insertions(+), 15 deletions(-)
Index: quilt-2.6/drivers/s390/cio/device_id.c
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/device_id.c
+++ quilt-2.6/drivers/s390/cio/device_id.c
@@ -27,7 +27,6 @@
/*
* diag210 is used under VM to get information about a virtual device
*/
-#ifdef CONFIG_64BIT
int
diag210(struct diag210 * addr)
{
@@ -43,6 +42,7 @@ diag210(struct diag210 * addr)
spin_lock_irqsave(&diag210_lock, flags);
diag210_tmp = *addr;

+#ifdef CONFIG_64BIT
asm volatile(
" lhi %0,-1\n"
" sam31\n"
@@ -51,19 +51,8 @@ diag210(struct diag210 * addr)
" srl %0,28\n"
"1: sam64\n"
EX_TABLE(0b,1b)
- : "=&d" (ccode) : "a" (__pa(&diag210_tmp)) : "cc", "memory");
-
- *addr = diag210_tmp;
- spin_unlock_irqrestore(&diag210_lock, flags);
-
- return ccode;
-}
+ : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
#else
-int
-diag210(struct diag210 * addr)
-{
- int ccode;
-
asm volatile(
" lhi %0,-1\n"
" diag %1,0,0x210\n"
@@ -71,11 +60,14 @@ diag210(struct diag210 * addr)
" srl %0,28\n"
"1:\n"
EX_TABLE(0b,1b)
- : "=&d" (ccode) : "a" (__pa(addr)) : "cc", "memory");
+ : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
+#endif
+
+ *addr = diag210_tmp;
+ spin_unlock_irqrestore(&diag210_lock, flags);

return ccode;
}
-#endif

/*
* Input :
--
blue skies,
Martin.

"Reality continues to ruin my life." - Calvin.

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