[PATCH] riscv: Add sfence.vma after page table changed

Greentime Hu
2020-08-04T03:02:14Z

This patch addes local_flush_tlb_page(addr) to use sfence.vma after the
page table changed. That address will be used immediately in
memset(nextp, 0, PAGE_SIZE) to cause this issue so we should add the
sfence.vma before we use it.

Fixes: f2c17aabc917 ("RISC-V: Implement compile-time fixed mappings")

Reported-by: Syven Wang <syven.wang@sifive.com>
Signed-off-by: Syven Wang <syven.wang@sifive.com>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
---
arch/riscv/mm/init.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index f4adb3684f3d..29b0f7108054 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -202,12 +202,11 @@ void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)

ptep = &fixmap_pte[pte_index(addr)];

- if (pgprot_val(prot)) {
+ if (pgprot_val(prot))
set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
- } else {
+ else
pte_clear(&init_mm, addr, ptep);
- local_flush_tlb_page(addr);
- }
+ local_flush_tlb_page(addr);
}

static pte_t *__init get_pte_virt(phys_addr_t pa)
--
2.28.0