From 46db2f86a3b2a94e0b33e0b4548fb7b7b6bdff66 Mon Sep 17 00:00:00 2001 From: Brian King Date: Fri, 28 Aug 2009 12:06:29 +0000 Subject: powerpc/pseries: Fix to handle slb resize across migration The SLB can change sizes across a live migration, which was not being handled, resulting in possible machine crashes during migration if migrating to a machine which has a smaller max SLB size than the source machine. Fix this by first reducing the SLB size to the minimum possible value, which is 32, prior to migration. Then during the device tree update which occurs after migration, we make the call to ensure the SLB gets updated. Also add the slb_size to the lparcfg output so that the migration tools can check to make sure the kernel has this capability before allowing migration in scenarios where the SLB size will change. BenH: Fixed #include -> to avoid breaking ppc32 build Signed-off-by: Brian King Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/mmu-hash64.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/powerpc/include/asm') diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h index b537903b9fca..bebe31c2e907 100644 --- a/arch/powerpc/include/asm/mmu-hash64.h +++ b/arch/powerpc/include/asm/mmu-hash64.h @@ -41,6 +41,7 @@ extern char initial_stab[]; #define SLB_NUM_BOLTED 3 #define SLB_CACHE_ENTRIES 8 +#define SLB_MIN_SIZE 32 /* Bits in the SLB ESID word */ #define SLB_ESID_V ASM_CONST(0x0000000008000000) /* valid */ @@ -276,6 +277,7 @@ extern void slb_flush_and_rebolt(void); extern void stab_initialize(unsigned long stab); extern void slb_vmalloc_update(void); +extern void slb_set_size(u16 size); #endif /* __ASSEMBLY__ */ /* -- cgit v1.2.2