4.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
commit f77084d96355f5fba8e2c1fb3a51a393b1570de7 upstream.
The WARN_ON_ONCE(__read_cr3() != build_cr3()) in switch_mm_irqs_off()
triggers every once in a while during a snapshotted system upgrade.
The warning triggers since commit decab0888e6e ("x86/mm: Remove
preempt_disable/enable() from __native_flush_tlb()"). The callchain is:
get_page_from_freelist() -> post_alloc_hook() -> __kernel_map_pages()
with CONFIG_DEBUG_PAGEALLOC enabled.
Disable preemption during CR3 reset / __flush_tlb_all() and add a comment
why preemption has to be disabled so it won't be removed accidentaly.
Add another preemptible() check in __flush_tlb_all() to catch callers with
enabled preemption when PGE is enabled, because PGE enabled does not
trigger the warning in __native_flush_tlb(). Suggested by Andy Lutomirski.
Fixes: decab0888e6e ("x86/mm: Remove preempt_disable/enable() from __native_flush_tlb()")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20181017103432.zgv46nlu3hc7k4rq@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/tlbflush.h | 6 ++++++
arch/x86/mm/pageattr.c | 6 +++++-
2 files changed, 11 insertions(+), 1 deletion(-)
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -469,6 +469,12 @@ static inline void __native_flush_tlb_on
*/
static inline void __flush_tlb_all(void)
{
+ /*
+ * This is to catch users with enabled preemption and the PGE feature
+ * and don't trigger the warning in __native_flush_tlb().
+ */
+ VM_WARN_ON_ONCE(preemptible());
+
if (boot_cpu_has(X86_FEATURE_PGE)) {
__flush_tlb_global();
} else {
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -2063,9 +2063,13 @@ void __kernel_map_pages(struct page *pag
/*
* We should perform an IPI and flush all tlbs,
- * but that can deadlock->flush only current cpu:
+ * but that can deadlock->flush only current cpu.
+ * Preemption needs to be disabled around __flush_tlb_all() due to
+ * CR3 reload in __native_flush_tlb().
*/
+ preempt_disable();
__flush_tlb_all();
+ preempt_enable();
arch_flush_lazy_mmu_mode();
}
