Zong Li 6435f773d8 riscv: mm: add support for CONFIG_DEBUG_VIRTUAL ... This patch implements CONFIG_DEBUG_VIRTUAL to do additional checks on virt_to_phys and __pa_symbol calls. virt_to_phys used for linear mapping check, and __pa_symbol used for kernel symbol check. In current RISC-V, kernel image maps to linear mapping area. If CONFIG_DEBUG_VIRTUAL is disable, these two functions calculate the offset on the address feded directly without any checks. The result of test_debug_virtual as follows: [ 0.358456] ------------[ cut here ]------------ [ 0.358738] virt_to_phys used for non-linear address: (____ptrval____) (0xffffffd000000000) [ 0.359174] WARNING: CPU: 0 PID: 1 at arch/riscv/mm/physaddr.c:16 __virt_to_phys+0x3c/0x50 [ 0.359409] Modules linked in: [ 0.359630] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.5.0-rc3-00002-g5133c5c0ca13 #57 [ 0.359861] epc: ffffffe000253d1a ra : ffffffe000253d1a sp : ffffffe03aa87da0 [ 0.360019] gp : ffffffe000ae03b0 tp : ffffffe03aa88000 t0 : ffffffe000af2660 [ 0.360175] t1 : 0000000000000064 t2 : 00000000000000b7 s0 : ffffffe03aa87dc0 [ 0.360330] s1 : ffffffd000000000 a0 : 000000000000004f a1 : 0000000000000000 [ 0.360492] a2 : 0000000000000000 a3 : 0000000000000000 a4 : ffffffe000a84358 [ 0.360672] a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000000000000 [ 0.360876] s2 : ffffffe000ae0600 s3 : ffffffe00000fc7c s4 : ffffffe0000224b0 [ 0.361067] s5 : ffffffe000030890 s6 : ffffffe000022470 s7 : 0000000000000008 [ 0.361267] s8 : ffffffe0000002c4 s9 : ffffffe000ae0640 s10: ffffffe000ae0630 [ 0.361453] s11: 0000000000000000 t3 : 0000000000000000 t4 : 000000000001e6d0 [ 0.361636] t5 : ffffffe000ae0a18 t6 : ffffffe000aee54e [ 0.361806] status: 0000000000000120 badaddr: 0000000000000000 cause: 0000000000000003 [ 0.362056] ---[ end trace aec0bf78d4978122 ]--- [ 0.362404] PA: 0xfffffff080200000 for VA: 0xffffffd000000000 [ 0.362607] PA: 0x00000000baddd2d0 for VA: 0xffffffe03abdd2d0 Signed-off-by: Zong Li <zong.li@sifive.com> Reviewed-by: Paul Walmsley <paul.walmsley@sifive.com> Tested-by: Paul Walmsley <paul.walmsley@sifive.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>		2020-01-23 10:40:06 -08:00
..
Makefile	riscv: mm: add support for CONFIG_DEBUG_VIRTUAL	2020-01-23 10:40:06 -08:00
cacheflush.c	riscv: export flush_icache_all to modules	2019-12-27 21:51:01 -08:00
context.c	riscv: add nommu support	2019-11-17 15:17:39 -08:00
extable.c	riscv: abstract out CSR names for supervisor vs machine mode	2019-11-05 09:20:42 -08:00
fault.c	riscv: abstract out CSR names for supervisor vs machine mode	2019-11-05 09:20:42 -08:00
hugetlbpage.c	riscv: Introduce huge page support for 32/64bit kernel	2019-07-03 15:23:38 -07:00
init.c	riscv: mm: use __pa_symbol for kernel symbols	2020-01-03 00:33:34 -08:00
kasan_init.c	riscv: Add KASAN support	2020-01-22 13:09:58 -08:00
physaddr.c	riscv: mm: add support for CONFIG_DEBUG_VIRTUAL	2020-01-23 10:40:06 -08:00
tlbflush.c	RISC-V: Issue a tlb page flush if possible	2019-10-29 11:32:18 -07:00