[PATCH 07/12] x86/tlb: use INVLPGB in flush_tlb_all

[Rik van Riel <riel@surriel.com>]

The flush_tlb_all() function is not used a whole lot, but we might
as well use broadcast TLB flushing there, too.

Signed-off-by: Rik van Riel <riel@surriel.com>
---
 arch/x86/mm/tlb.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 29207dc5b807..266d5174fc7b 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -1074,6 +1074,12 @@ static void do_flush_tlb_all(void *info)
 void flush_tlb_all(void)
 {
 	count_vm_tlb_event(NR_TLB_REMOTE_FLUSH);
+	if (cpu_feature_enabled(X86_FEATURE_INVLPGB)) {
+		guard(preempt)();
+		invlpgb_flush_all();
+		tlbsync();
+		return;
+	}
 	on_each_cpu(do_flush_tlb_all, NULL, 1);
 }
 
-- 
2.47.1