[PATCH -tip 4/4] Atomic text_poke() with fixmap take2

[Masami Hiramatsu <mhiramat@redhat.com>]

Mathieu Desnoyers wrote:
>> @@ -523,14 +526,17 @@ void *__kprobes text_poke(void *addr, co
>>  		pages[1] = virt_to_page(addr + PAGE_SIZE);
>>  	}
>>  	BUG_ON(!pages[0]);
>> -	if (!pages[1])
>> -		nr_pages = 1;
>> -	vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
>> -	BUG_ON(!vaddr);
>> -	local_irq_disable();
>> +	set_fixmap(FIX_TEXT_POKE0, page_to_phys(pages[0]));
> 
> Can the set_fixmap/clear_fixmap/local_flush_tlb be called within
> local_irq_save ? If yes, that would be better, especially for the SMP
> alternatives code, which would rely on interrupt disabling in text_poke
> for consistency (the mutex is not needed there).

Yes, that just changes pte.

---
Use fixmaps instead of vmap/vunmap in text_poke() for avoiding page allocation
and delayed unmapping.

At the result of above change, text_poke() becomes atomic and can be called
from stop_machine() etc.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/include/asm/fixmap.h |    2 ++
 arch/x86/kernel/alternative.c |   24 +++++++++++++++---------
 2 files changed, 17 insertions(+), 9 deletions(-)

Index: linux-2.6-tip/arch/x86/kernel/alternative.c
===================================================================
--- linux-2.6-tip.orig/arch/x86/kernel/alternative.c
+++ linux-2.6-tip/arch/x86/kernel/alternative.c
@@ -13,7 +13,9 @@
 #include <asm/nmi.h>
 #include <asm/vsyscall.h>
 #include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
 #include <asm/io.h>
+#include <asm/fixmap.h>

 #define MAX_PATCH_LEN (255-1)

@@ -505,15 +507,16 @@ void *text_poke_early(void *addr, const
  * It means the size must be writable atomically and the address must be aligned
  * in a way that permits an atomic write. It also makes sure we fit on a single
  * page.
+ *
+ * Note: Must be called under text_mutex.
  */
 void *__kprobes text_poke(void *addr, const void *opcode, size_t len)
 {
+	unsigned long flags;
 	char *vaddr;
-	int nr_pages = 2;
 	struct page *pages[2];
 	int i;

-	might_sleep();
 	if (!core_kernel_text((unsigned long)addr)) {
 		pages[0] = vmalloc_to_page(addr);
 		pages[1] = vmalloc_to_page(addr + PAGE_SIZE);
@@ -523,14 +526,17 @@ void *__kprobes text_poke(void *addr, co
 		pages[1] = virt_to_page(addr + PAGE_SIZE);
 	}
 	BUG_ON(!pages[0]);
-	if (!pages[1])
-		nr_pages = 1;
-	vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
-	BUG_ON(!vaddr);
-	local_irq_disable();
+	local_irq_save(flags);
+	set_fixmap(FIX_TEXT_POKE0, page_to_phys(pages[0]));
+	if (pages[1])
+		set_fixmap(FIX_TEXT_POKE1, page_to_phys(pages[1]));
+	vaddr = (char *)fix_to_virt(FIX_TEXT_POKE0);
 	memcpy(&vaddr[(unsigned long)addr & ~PAGE_MASK], opcode, len);
-	local_irq_enable();
-	vunmap(vaddr);
+	clear_fixmap(FIX_TEXT_POKE0);
+	if (pages[1])
+		clear_fixmap(FIX_TEXT_POKE1);
+	local_flush_tlb();
+	local_irq_restore(flags);
 	sync_core();
 	/* Could also do a CLFLUSH here to speed up CPU recovery; but
 	   that causes hangs on some VIA CPUs. */
Index: linux-2.6-tip/arch/x86/include/asm/fixmap.h
===================================================================
--- linux-2.6-tip.orig/arch/x86/include/asm/fixmap.h
+++ linux-2.6-tip/arch/x86/include/asm/fixmap.h
@@ -111,6 +111,8 @@ enum fixed_addresses {
 #ifdef CONFIG_PARAVIRT
 	FIX_PARAVIRT_BOOTMAP,
 #endif
+	FIX_TEXT_POKE0,	/* reserve 2 pages for text_poke() */
+	FIX_TEXT_POKE1,
 	__end_of_permanent_fixed_addresses,
 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 	FIX_OHCI1394_BASE,
-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com