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[11/11] x86/mm: only invalidate final translations with INVLPGB

Message ID 20241223025751.3268975-12-riel@surriel.com (mailing list archive)
State New
Headers show
Series AMD broadcast TLB invalidation | expand

Commit Message

Rik van Riel Dec. 23, 2024, 2:55 a.m. UTC 
Use the INVLPGB_FINAL_ONLY flag when invalidating mappings with INVPLGB.
This way only leaf mappings get removed from the TLB, leaving intermediate
translations cached.

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@surriel.com>
---
 arch/x86/include/asm/invlpgb.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/include/asm/invlpgb.h b/arch/x86/include/asm/invlpgb.h
index 862775897a54..2669ebfffe81 100644
--- a/arch/x86/include/asm/invlpgb.h
+++ b/arch/x86/include/asm/invlpgb.h
@@ -51,7 +51,7 @@  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. */