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From:   Alexandre Ghiti <alex@ghiti.fr>
To:     Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Nylon Chen <nylon7@andestech.com>,
        Nick Hu <nickhu@andestech.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        kasan-dev@googlegroups.com
Cc:     Alexandre Ghiti <alex@ghiti.fr>,
        Palmer Dabbelt <palmerdabbelt@google.com>
Subject: [PATCH v3 1/2] riscv: Ensure page table writes are flushed when initializing KASAN vmalloc
Date:   Sat, 13 Mar 2021 03:45:04 -0500
Message-Id: <20210313084505.16132-2-alex@ghiti.fr>
In-Reply-To: <20210313084505.16132-1-alex@ghiti.fr>
References: <20210313084505.16132-1-alex@ghiti.fr>
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Make sure that writes to kernel page table during KASAN vmalloc
initialization are made visible by adding a sfence.vma.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
---
 arch/riscv/mm/kasan_init.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index 1b968855d389..57bf4ae09361 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@ -187,6 +187,8 @@ void __init kasan_shallow_populate(void *start, void *end)
 		}
 		vaddr += PAGE_SIZE;
 	}
+
+	local_flush_tlb_all();
 }
 
 void __init kasan_init(void)
-- 
2.20.1