linux-kernel - [PATCH V5 1/3] riscv: Use global mappings for kernel pages

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Message-Id: <1622393366-46079-2-git-send-email-guoren@kernel.org>
Date:   Sun, 30 May 2021 16:49:24 +0000
From:   guoren@...nel.org
To:     guoren@...nel.org, anup.patel@....com, palmerdabbelt@...gle.com,
        arnd@...db.de, hch@....de
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH V5 1/3] riscv: Use global mappings for kernel pages

From: Guo Ren <guoren@...ux.alibaba.com>

We map kernel pages into all addresses space, so they can be marked as
global. This allows hardware to avoid flushing the kernel mappings when
moving between address spaces.

Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Reviewed-by: Anup Patel <anup@...infault.org>
Reviewed-by: Christoph Hellwig <hch@....de>
Cc: Palmer Dabbelt <palmerdabbelt@...gle.com>
---
 arch/riscv/include/asm/pgtable.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 9469f46..346a3c6 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -134,7 +134,8 @@
 				| _PAGE_WRITE \
 				| _PAGE_PRESENT \
 				| _PAGE_ACCESSED \
-				| _PAGE_DIRTY)
+				| _PAGE_DIRTY \
+				| _PAGE_GLOBAL)
 
 #define PAGE_KERNEL		__pgprot(_PAGE_KERNEL)
 #define PAGE_KERNEL_READ	__pgprot(_PAGE_KERNEL & ~_PAGE_WRITE)
-- 
2.7.4