Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   guoren@kernel.org
To:     guoren@kernel.org, anup.patel@wdc.com, palmerdabbelt@google.com,
        arnd@arndb.de, wens@csie.org, maxime@cerno.tech,
        drew@beagleboard.org, liush@allwinnertech.com,
        lazyparser@gmail.com, wefu@redhat.com
Cc:     linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-arch@vger.kernel.org, linux-sunxi@lists.linux.dev,
        Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V5 1/3] riscv: Use global mappings for kernel pages
Date:   Sun,  6 Jun 2021 09:03:57 +0000
Message-Id: <1622970249-50770-3-git-send-email-guoren@kernel.org>
In-Reply-To: <1622970249-50770-1-git-send-email-guoren@kernel.org>
References: <1622970249-50770-1-git-send-email-guoren@kernel.org>
Precedence: bulk

From: Guo Ren <guoren@linux.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@linux.alibaba.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Palmer Dabbelt <palmerdabbelt@google.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