3 Commits

Author	SHA1	Message	Date
Alexandre Ghiti	edf9556472	riscv: Use accessors to page table entries instead of direct dereference ... As very well explained in commit 20a004e7b0 ("arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables"), an architecture whose page table walker can modify the PTE in parallel must use READ_ONCE()/WRITE_ONCE() macro to avoid any compiler transformation. So apply that to riscv which is such architecture. Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Acked-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20231213203001.179237-5-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>	2023-12-20 10:48:15 -08:00
Alexandre Ghiti	25abe0db92	riscv: Fix kfence now that the linear mapping can be backed by PUD/P4D/PGD ... RISC-V Kfence implementation used to rely on the fact the linear mapping was backed by at most PMD hugepages, which is not true anymore since commit 3335068f87 ("riscv: Use PUD/P4D/PGD pages for the linear mapping"). Instead of splitting PUD/P4D/PGD mappings afterwards, directly map the kfence pool region using PTE mappings by allocating this region before setup_vm_final(). Reported-by: syzbot+a74d57bddabbedd75135@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=a74d57bddabbedd75135 Fixes: 3335068f87 ("riscv: Use PUD/P4D/PGD pages for the linear mapping") Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20230606130444.25090-1-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>	2023-06-07 07:13:53 -07:00
Liu Shixin	47513f243b	riscv: Enable KFENCE for riscv64 ... Add architecture specific implementation details for KFENCE and enable KFENCE for the riscv64 architecture. In particular, this implements the required interface in <asm/kfence.h>. KFENCE requires that attributes for pages from its memory pool can individually be set. Therefore, force the kfence pool to be mapped at page granularity. Testing this patch using the testcases in kfence_test.c and all passed. Signed-off-by: Liu Shixin <liushixin2@huawei.com> Acked-by: Marco Elver <elver@google.com> Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>	2021-06-30 20:55:41 -07:00