Commit e43594da authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Greg Kroah-Hartman

mm/tlb, x86/mm: Support invalidating TLB caches for RCU_TABLE_FREE

commit d86564a2 upstream.

Jann reported that x86 was missing required TLB invalidates when he
hit the !*batch slow path in tlb_remove_table().

This is indeed the case; RCU_TABLE_FREE does not provide TLB (cache)
invalidates, the PowerPC-hash where this code originated and the
Sparc-hash where this was subsequently used did not need that. ARM
which later used this put an explicit TLB invalidate in their
__p*_free_tlb() functions, and PowerPC-radix followed that example.

But when we hooked up x86 we failed to consider this. Fix this by
(optionally) hooking tlb_remove_table() into the TLB invalidate code.

NOTE: s390 was also needing something like this and might now
      be able to use the generic code again.

[ Modified to be on top of Nick's cleanups, which simplified this patch
  now that tlb_flush_mmu_tlbonly() really only flushes the TLB - Linus ]

Fixes: 9e52fc2b ("x86/mm: Enable RCU based page table freeing (CONFIG_HAVE_RCU_TABLE_FREE=y)")
Reported-by: default avatarJann Horn <jannh@google.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarRik van Riel <riel@surriel.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: David Miller <davem@davemloft.net>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: stable@kernel.org
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 575a66cb
......@@ -354,6 +354,9 @@ config HAVE_ARCH_JUMP_LABEL
config HAVE_RCU_TABLE_FREE
bool
config HAVE_RCU_TABLE_INVALIDATE
bool
config ARCH_HAVE_NMI_SAFE_CMPXCHG
bool
......
......@@ -179,6 +179,7 @@ config X86
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP
select HAVE_RCU_TABLE_FREE
select HAVE_RCU_TABLE_INVALIDATE if HAVE_RCU_TABLE_FREE
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RELIABLE_STACKTRACE if X86_64 && UNWINDER_FRAME_POINTER && STACK_VALIDATION
select HAVE_STACKPROTECTOR if CC_HAS_SANE_STACKPROTECTOR
......
......@@ -330,6 +330,21 @@ bool __tlb_remove_page_size(struct mmu_gather *tlb, struct page *page, int page_
* See the comment near struct mmu_table_batch.
*/
/*
* If we want tlb_remove_table() to imply TLB invalidates.
*/
static inline void tlb_table_invalidate(struct mmu_gather *tlb)
{
#ifdef CONFIG_HAVE_RCU_TABLE_INVALIDATE
/*
* Invalidate page-table caches used by hardware walkers. Then we still
* need to RCU-sched wait while freeing the pages because software
* walkers can still be in-flight.
*/
tlb_flush_mmu_tlbonly(tlb);
#endif
}
static void tlb_remove_table_smp_sync(void *arg)
{
/* Simply deliver the interrupt */
......@@ -366,6 +381,7 @@ void tlb_table_flush(struct mmu_gather *tlb)
struct mmu_table_batch **batch = &tlb->batch;
if (*batch) {
tlb_table_invalidate(tlb);
call_rcu_sched(&(*batch)->rcu, tlb_remove_table_rcu);
*batch = NULL;
}
......@@ -387,11 +403,13 @@ void tlb_remove_table(struct mmu_gather *tlb, void *table)
if (*batch == NULL) {
*batch = (struct mmu_table_batch *)__get_free_page(GFP_NOWAIT | __GFP_NOWARN);
if (*batch == NULL) {
tlb_table_invalidate(tlb);
tlb_remove_table_one(table);
return;
}
(*batch)->nr = 0;
}
(*batch)->tables[(*batch)->nr++] = table;
if ((*batch)->nr == MAX_TABLE_BATCH)
tlb_table_flush(tlb);
......
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