linux-kernel - [PATCH] implement flush_cache

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Date:   Mon, 12 Apr 2021 00:05:30 +0000
From:   Jiuyang Liu <liu@...yang.me>
To:     Alex Ghiti <alex@...ti.fr>, Palmer Dabbelt <palmer@...belt.com>
Cc:     Jiuyang Liu <liu@...yang.me>,
        Andrew Waterman <waterman@...s.berkeley.edu>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] implement flush_cache_vmap for RISC-V

This patch implements flush_cache_vmap for RISC-V, since it modifies PTE.
Without this patch, SFENCE.VMA won't be added to related codes, which
might introduce a bug in the out-of-order micro-architecture
implementations.

Signed-off-by: Jiuyang Liu <liu@...yang.me>
Reviewed-by: Alexandre Ghiti <alex@...ti.fr>
Reviewed-by: Palmer Dabbelt <palmer@...belt.com>
---
 arch/riscv/include/asm/cacheflush.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h
index 23ff70350992..3fd528badc35 100644
--- a/arch/riscv/include/asm/cacheflush.h
+++ b/arch/riscv/include/asm/cacheflush.h
@@ -30,6 +30,12 @@ static inline void flush_dcache_page(struct page *page)
 #define flush_icache_user_page(vma, pg, addr, len) \
 	flush_icache_mm(vma->vm_mm, 0)
 
+/*
+ * flush_cache_vmap is invoked after map_kernel_range() has installed the page
+ * table entries, which modifies PTE, SFENCE.VMA should be inserted.
+ */
+#define flush_cache_vmap(start, end) flush_tlb_all()
+
 #ifndef CONFIG_SMP
 
 #define flush_icache_all() local_flush_icache_all()
-- 
2.31.1