I'm seeing oopses in probe_roms() and pci_find_bios(), apparently
because those pages are not mapped under Xen. I'm not sure why I'm
seeing this now and not before, but I suspect its because I enabled
CONFIG_DEBUG_PAGEALLOC. Anyway, I've got these patches to deal with
these cases:
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -276,7 +276,14 @@ static struct resource standard_io_resou
#define STANDARD_IO_RESOURCES \
(sizeof standard_io_resources / sizeof standard_io_resources[0])
-#define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
+static inline int romsignature(const unsigned char *x)
+{
+ unsigned short sig;
+ int ret = 0;
+ if (__get_user(sig, (const unsigned short *)x) == 0)
+ ret = (sig == 0xaa55);
+ return ret;
+}
static int __init romchecksum(unsigned char *rom, unsigned long length)
{
--- a/arch/i386/pci/pcbios.c
+++ b/arch/i386/pci/pcbios.c
@@ -5,6 +5,7 @@
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/module.h>
+#include <asm/uaccess.h>
#include "pci.h"
#include "pci-functions.h"
@@ -301,7 +302,7 @@ static struct pci_raw_ops pci_bios_acces
static struct pci_raw_ops * __devinit pci_find_bios(void)
{
- union bios32 *check;
+ union bios32 *check, sig;
unsigned char sum;
int i, length;
@@ -314,6 +315,10 @@ static struct pci_raw_ops * __devinit pc
for (check = (union bios32 *) __va(0xe0000);
check <= (union bios32 *) __va(0xffff0);
++check) {
+ long sig;
+ if (__get_user(sig, &check->fields.signature))
+ continue;
+
if (check->fields.signature != BIOS32_SIGNATURE)
continue;
length = check->fields.length * 16;
Does this seem reasonable, or should there be some other fix?
J
