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powerpc: Copy down exception vectors after feature fixups

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kdump fails because we try to execute an HV only instruction. Feature
fixups are being applied after we copy the exception vectors down to 0
so they miss out on any updates.

We have always had this issue but it only became critical in v3.0
when we added CFAR support (breaks POWER5) and v3.1 when we added
POWERNV (breaks everyone).

Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: <stable@kernel.org> [v3.0+]
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2011-11-14 12:54:47 +00:00 committed by Benjamin Herrenschmidt
parent 6d1e2c6c1a
commit d715e433b7
6 changed files with 28 additions and 2 deletions
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2
arch/powerpc/include/asm/sections.h
View file

@ -8,7 +8,7 @@
#ifdef __powerpc64__
extern char _end[];
extern char __end_interrupts[];
static inline int in_kernel_text(unsigned long addr)
{

1
arch/powerpc/include/asm/synch.h
View file

@ -13,6 +13,7 @@
extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
void *fixup_end);
extern void do_final_fixups(void);
static inline void eieio(void)
{

1
arch/powerpc/kernel/kvm.c
View file

@ -132,7 +132,6 @@ static void kvm_patch_ins_b(u32 *inst, int addr)
/* On relocatable kernels interrupts handlers and our code
can be in different regions, so we don't patch them */
extern u32 __end_interrupts;
if ((ulong)inst < (ulong)&__end_interrupts)
return;
#endif

2
arch/powerpc/kernel/setup_32.c
View file

@ -107,6 +107,8 @@ notrace unsigned long __init early_init(unsigned long dt_ptr)
PTRRELOC(&__start___lwsync_fixup),
PTRRELOC(&__stop___lwsync_fixup));
do_final_fixups();
return KERNELBASE + offset;
}

1
arch/powerpc/kernel/setup_64.c
View file

@ -359,6 +359,7 @@ void __init setup_system(void)
&__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
do_lwsync_fixups(cur_cpu_spec->cpu_features,
&__start___lwsync_fixup, &__stop___lwsync_fixup);
do_final_fixups();
/*
* Unflatten the device-tree passed by prom_init or kexec

23
arch/powerpc/lib/feature-fixups.c
View file

@ -18,6 +18,8 @@
#include <linux/init.h>
#include <asm/cputable.h>
#include <asm/code-patching.h>
#include <asm/page.h>
#include <asm/sections.h>
struct fixup_entry {
@ -128,6 +130,27 @@ void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
}
}
void do_final_fixups(void)
{
#if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
int *src, *dest;
unsigned long length;
if (PHYSICAL_START == 0)
return;
src = (int *)(KERNELBASE + PHYSICAL_START);
dest = (int *)KERNELBASE;
length = (__end_interrupts - _stext) / sizeof(int);
while (length--) {
patch_instruction(dest, *src);
src++;
dest++;
}
#endif
}
#ifdef CONFIG_FTR_FIXUP_SELFTEST
#define check(x) \