From 7cf099de79e12d6c4949f733c8cbb241bb08f07a Mon Sep 17 00:00:00 2001 From: Rik van Riel Date: Tue, 25 Feb 2025 22:00:41 -0500 Subject: 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) 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(-) --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -1339,7 +1339,9 @@ void arch_tlbbatch_flush(struct arch_tlb * 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();