linux-kernel - [tip: x86/mm] x86/mm: Use broadcast TLB flushing in page reclaim

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Message-ID: <174121058573.14745.18178096566558928235.tip-bot2@tip-bot2>
Date: Wed, 05 Mar 2025 21:36:25 -0000
From: "tip-bot2 for Rik van Riel" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Rik van Riel <riel@...riel.com>, "Borislav Petkov (AMD)" <bp@...en8.de>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/mm] x86/mm: Use broadcast TLB flushing in page reclaim

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     0b3a2f246a5bf016b80a136a9f8c24d886107dc3
Gitweb:        https://git.kernel.org/tip/0b3a2f246a5bf016b80a136a9f8c24d886107dc3
Author:        Rik van Riel <riel@...riel.com>
AuthorDate:    Tue, 25 Feb 2025 22:00:41 -05:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Wed, 05 Mar 2025 17:19:52 +01:00

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 <riel@...riel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
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 8cd084b..76b4a88 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();