From 94ee42727ce06522787a28476465becace1c238b Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Wed, 3 Oct 2018 00:27:58 +1000 Subject: powerpc/64s/hash: Simplify slb_flush_and_rebolt() slb_flush_and_rebolt() is misleading, it is called in virtual mode, so it can not possibly change the stack, so it should not be touching the shadow area. And since vmalloc is no longer bolted, it should not change any bolted mappings at all. Change the name to slb_flush_and_restore_bolted(), and have it just load the kernel stack from what's currently in the shadow SLB area. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/book3s/64/mmu-hash.h | 2 +- arch/powerpc/kernel/swsusp_asm64.S | 2 +- arch/powerpc/mm/hash_utils_64.c | 4 +-- arch/powerpc/mm/slb.c | 46 ++++++++++----------------- arch/powerpc/mm/slice.c | 2 +- 5 files changed, 21 insertions(+), 35 deletions(-) diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h index 14e552ea5e52..60cda8fb0677 100644 --- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h +++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h @@ -503,7 +503,7 @@ struct slb_entry { }; extern void slb_initialize(void); -extern void slb_flush_and_rebolt(void); +void slb_flush_and_restore_bolted(void); void slb_flush_all_realmode(void); void __slb_restore_bolted_realmode(void); void slb_restore_bolted_realmode(void); diff --git a/arch/powerpc/kernel/swsusp_asm64.S b/arch/powerpc/kernel/swsusp_asm64.S index f83bf6f72cb0..185216becb8b 100644 --- a/arch/powerpc/kernel/swsusp_asm64.S +++ b/arch/powerpc/kernel/swsusp_asm64.S @@ -262,7 +262,7 @@ END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR) addi r1,r1,-128 #ifdef CONFIG_PPC_BOOK3S_64 - bl slb_flush_and_rebolt + bl slb_flush_and_restore_bolted #endif bl do_after_copyback addi r1,r1,128 diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 854edc3722e0..0cc7fbc3bd1c 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -1125,7 +1125,7 @@ void demote_segment_4k(struct mm_struct *mm, unsigned long addr) if ((get_paca_psize(addr) != MMU_PAGE_4K) && (current->mm == mm)) { copy_mm_to_paca(mm); - slb_flush_and_rebolt(); + slb_flush_and_restore_bolted(); } } #endif /* CONFIG_PPC_64K_PAGES */ @@ -1197,7 +1197,7 @@ static void check_paca_psize(unsigned long ea, struct mm_struct *mm, if (user_region) { if (psize != get_paca_psize(ea)) { copy_mm_to_paca(mm); - slb_flush_and_rebolt(); + slb_flush_and_restore_bolted(); } } else if (get_paca()->vmalloc_sllp != mmu_psize_defs[mmu_vmalloc_psize].sllp) { diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c index 3b7d8af09724..d8d9c9bd15d3 100644 --- a/arch/powerpc/mm/slb.c +++ b/arch/powerpc/mm/slb.c @@ -115,8 +115,6 @@ void __slb_restore_bolted_realmode(void) /* * Insert the bolted entries into an empty SLB. - * This is not the same as rebolt because the bolted segments are not - * changed, just loaded from the shadow area. */ void slb_restore_bolted_realmode(void) { @@ -135,12 +133,15 @@ void slb_flush_all_realmode(void) asm volatile("slbmte %0,%0; slbia" : : "r" (0)); } -void slb_flush_and_rebolt(void) +/* + * This flushes non-bolted entries, it can be run in virtual mode. Must + * be called with interrupts disabled. + */ +void slb_flush_and_restore_bolted(void) { - /* If you change this make sure you change SLB_NUM_BOLTED - * and PR KVM appropriately too. */ - unsigned long linear_llp, lflags; - unsigned long ksp_esid_data, ksp_vsid_data; + struct slb_shadow *p = get_slb_shadow(); + + BUILD_BUG_ON(SLB_NUM_BOLTED != 2); WARN_ON(!irqs_disabled()); @@ -150,30 +151,12 @@ void slb_flush_and_rebolt(void) */ hard_irq_disable(); - linear_llp = mmu_psize_defs[mmu_linear_psize].sllp; - lflags = SLB_VSID_KERNEL | linear_llp; - - ksp_esid_data = mk_esid_data(get_paca()->kstack, mmu_kernel_ssize, KSTACK_INDEX); - if ((ksp_esid_data & ~0xfffffffUL) <= PAGE_OFFSET) { - ksp_esid_data &= ~SLB_ESID_V; - ksp_vsid_data = 0; - slb_shadow_clear(KSTACK_INDEX); - } else { - /* Update stack entry; others don't change */ - slb_shadow_update(get_paca()->kstack, mmu_kernel_ssize, lflags, KSTACK_INDEX); - ksp_vsid_data = - be64_to_cpu(get_slb_shadow()->save_area[KSTACK_INDEX].vsid); - } - - /* We need to do this all in asm, so we're sure we don't touch - * the stack between the slbia and rebolting it. */ asm volatile("isync\n" "slbia\n" - /* Slot 1 - kernel stack */ - "slbmte %0,%1\n" - "isync" - :: "r"(ksp_vsid_data), - "r"(ksp_esid_data) + "slbmte %0, %1\n" + "isync\n" + :: "r" (be64_to_cpu(p->save_area[KSTACK_INDEX].vsid)), + "r" (be64_to_cpu(p->save_area[KSTACK_INDEX].esid)) : "memory"); get_paca()->slb_cache_ptr = 0; @@ -254,7 +237,10 @@ void slb_dump_contents(struct slb_entry *slb_ptr) void slb_vmalloc_update(void) { - slb_flush_and_rebolt(); + /* + * vmalloc is not bolted, so just have to flush non-bolted. + */ + slb_flush_and_restore_bolted(); } static bool preload_hit(struct thread_info *ti, unsigned long esid) diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c index 546dd07c8083..50ba3d0456a5 100644 --- a/arch/powerpc/mm/slice.c +++ b/arch/powerpc/mm/slice.c @@ -219,7 +219,7 @@ static void slice_flush_segments(void *parm) copy_mm_to_paca(current->active_mm); local_irq_save(flags); - slb_flush_and_rebolt(); + slb_flush_and_restore_bolted(); local_irq_restore(flags); #endif } -- cgit v1.2.3