linux-kernel - [PATCH 10/10] x86/mm: only invalidate final translations with INVLPGB

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Message-ID: <20241222040717.3096835-11-riel@surriel.com>
Date: Sat, 21 Dec 2024 23:06:42 -0500
From: Rik van Riel <riel@...riel.com>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	dave.hansen@...ux.intel.com,
	luto@...nel.org,
	peterz@...radead.org,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	hpa@...or.com,
	akpm@...ux-foundation.org,
	Rik van Riel <riel@...riel.com>
Subject: [PATCH 10/10] x86/mm: only invalidate final translations with INVLPGB

Use the INVLPGB_FINAL_ONLY flag when invalidating mappings with INVPLGB.
This leaves intermediate translations cached in the TLB.

On the (rare) occasions where we free page tables we do a full flush,
ensuring intermediate translations get flushed from the TLB.

Signed-off-by: Rik van Riel <riel@...riel.com>
---
 arch/x86/include/asm/invlpgb.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/invlpgb.h b/arch/x86/include/asm/invlpgb.h
index ef12ea4a8d65..c1478277b9ea 100644
--- a/arch/x86/include/asm/invlpgb.h
+++ b/arch/x86/include/asm/invlpgb.h
@@ -56,7 +56,7 @@ static inline void invlpgb_flush_user(unsigned long pcid,
 static inline void invlpgb_flush_user_nr(unsigned long pcid, unsigned long addr, int nr,
 					 bool pmd_stride)
 {
-	__invlpgb(0, pcid, addr, nr - 1, pmd_stride, INVLPGB_PCID | INVLPGB_VA);
+	__invlpgb(0, pcid, addr, nr - 1, pmd_stride, INVLPGB_PCID | INVLPGB_VA | INVLPGB_FINAL_ONLY);
 }
 
 /* Flush all mappings for a given ASID, not including globals. */
-- 
2.47.1