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From:   guoren@kernel.org
To:     guoren@kernel.org, anup.patel@wdc.com, palmerdabbelt@google.com,
        arnd@arndb.de
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 1/3] riscv: Fixup _PAGE_GLOBAL in _PAGE_KERNEL
Date:   Mon, 24 May 2021 06:51:06 +0000
Message-Id: <1621839068-31738-1-git-send-email-guoren@kernel.org>
Precedence: bulk

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

Kernel virtual address translation should avoid care asid or it'll
cause more TLB-miss and TLB-refill. Because the current asid in satp
belongs to the current process, but the target kernel va TLB entry's
asid still belongs to the previous process.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Anup Patel <anup.patel@wdc.com>
Cc: Palmer Dabbelt <palmerdabbelt@google.com>
---
 arch/riscv/include/asm/pgtable.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 78f2323..017da15 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -135,6 +135,7 @@
 				| _PAGE_PRESENT \
 				| _PAGE_ACCESSED \
 				| _PAGE_DIRTY \
+				| _PAGE_GLOBAL \
 				| _PAGE_CACHE)
 
 #define PAGE_KERNEL		__pgprot(_PAGE_KERNEL)
-- 
2.7.4