linux-kernel - [PATCH 4/8] x86/mm/cpa: Use flush_tlb_kernel

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Date:   Wed, 19 Sep 2018 10:50:20 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Bin Yang <bin.yang@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Mark Gross <mark.gross@...el.com>
Subject: [PATCH 4/8] x86/mm/cpa: Use flush_tlb_kernel_range()

Both cpa_flush_range() and cpa_flush_array() have a well specified
range, use that to do a range based TLB invalidate.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/mm/pageattr.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -293,7 +293,7 @@ static void cpa_flush_range(unsigned lon
 	BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
 	WARN_ON(PAGE_ALIGN(start) != start);
 
-	flush_tlb_all();
+	flush_tlb_kernel_range(start, start + PAGE_SIZE * numpages);
 
 	if (!cache)
 		return;
@@ -315,14 +315,15 @@ static void cpa_flush_range(unsigned lon
 	}
 }
 
-static void cpa_flush_array(unsigned long *start, int numpages, int cache,
+static void cpa_flush_array(unsigned long baddr, unsigned long *start,
+			    int numpages, int cache,
 			    int in_flags, struct page **pages)
 {
 	unsigned int i, level;
 
 	BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
 
-	flush_tlb_all();
+	flush_tlb_kernel_range(baddr, baddr + PAGE_SIZE * numpages);
 
 	if (!cache)
 		return;
@@ -1754,7 +1755,7 @@ static int change_page_attr_set_clr(unsi
 	 */
 	if (!ret && boot_cpu_has(X86_FEATURE_CLFLUSH)) {
 		if (cpa.flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) {
-			cpa_flush_array(addr, numpages, cache,
+			cpa_flush_array(baddr, addr, numpages, cache,
 					cpa.flags, pages);
 		} else
 			cpa_flush_range(baddr, numpages, cache);