From 72a920eacd8ab02a519fde94ef4fdffe8740d84b Mon Sep 17 00:00:00 2001 From: Rik van Riel Date: Tue, 25 Feb 2025 22:00:41 -0500 Subject: [PATCH] x86/mm: Use broadcast TLB flushing in page reclaim Page reclaim tracks only the CPU(s) where the TLB needs to be flushed, rather than all the individual mappings that may be getting invalidated. Use broadcast TLB flushing when that is available. [ bp: Massage commit message. ] Signed-off-by: Rik van Riel Signed-off-by: Borislav Petkov (AMD) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20250226030129.530345-7-riel@surriel.com --- arch/x86/mm/tlb.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 8cd084bc3d987..76b4a88afb563 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -1320,7 +1320,9 @@ void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch) * a local TLB flush is needed. Optimize this use-case by calling * flush_tlb_func_local() directly in this case. */ - if (cpumask_any_but(&batch->cpumask, cpu) < nr_cpu_ids) { + if (cpu_feature_enabled(X86_FEATURE_INVLPGB)) { + invlpgb_flush_all_nonglobals(); + } else if (cpumask_any_but(&batch->cpumask, cpu) < nr_cpu_ids) { flush_tlb_multi(&batch->cpumask, info); } else if (cpumask_test_cpu(cpu, &batch->cpumask)) { lockdep_assert_irqs_enabled(); -- 2.39.5