From: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
raise_mmu_exception(), as is today, is prioritizing guest page faults by
checking first if virt_enabled && !first_stage, and then considering the
regular inst/load/store faults.
There's no mention in the spec about guest page fault being a higher
priority that PMP faults. In fact, privileged spec section 3.7.1 says:
"Attempting to fetch an instruction from a PMP region that does not have
execute permissions raises an instruction access-fault exception.
Attempting to execute a load or load-reserved instruction which accesses
a physical address within a PMP region without read permissions raises a
load access-fault exception. Attempting to execute a store,
store-conditional, or AMO instruction which accesses a physical address
within a PMP region without write permissions raises a store
access-fault exception."
So, in fact, we're doing it wrong - PMP faults should always be thrown,
regardless of also being a first or second stage fault.
The way riscv_cpu_tlb_fill() and get_physical_address() work is
adequate: a TRANSLATE_PMP_FAIL error is immediately reported and
reflected in the 'pmp_violation' flag. What we need is to change
raise_mmu_exception() to prioritize it.
Reported-by: Joseph Chan <jc...@ventanamicro.com>
Fixes: 82d53adfbb ("target/riscv/cpu_helper.c: Invalid exception on MMU
translation stage")
Reviewed-by: Alistair Francis <alistair.fran...@wdc.com>
Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
---
target/riscv/cpu_helper.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index fc090d729a..e3a7797d00 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -1176,28 +1176,30 @@ static void raise_mmu_exception(CPURISCVState *env,
target_ulong address,
switch (access_type) {
case MMU_INST_FETCH:
- if (env->virt_enabled && !first_stage) {
+ if (pmp_violation) {
+ cs->exception_index = RISCV_EXCP_INST_ACCESS_FAULT;
+ } else if (env->virt_enabled && !first_stage) {
cs->exception_index = RISCV_EXCP_INST_GUEST_PAGE_FAULT;
} else {
- cs->exception_index = pmp_violation ?
- RISCV_EXCP_INST_ACCESS_FAULT : RISCV_EXCP_INST_PAGE_FAULT;
+ cs->exception_index = RISCV_EXCP_INST_PAGE_FAULT;
}
break;
case MMU_DATA_LOAD:
- if (two_stage && !first_stage) {
+ if (pmp_violation) {
+ cs->exception_index = RISCV_EXCP_LOAD_ACCESS_FAULT;
+ } else if (two_stage && !first_stage) {
cs->exception_index = RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT;
} else {
- cs->exception_index = pmp_violation ?
- RISCV_EXCP_LOAD_ACCESS_FAULT : RISCV_EXCP_LOAD_PAGE_FAULT;
+ cs->exception_index = RISCV_EXCP_LOAD_PAGE_FAULT;
}
break;
case MMU_DATA_STORE:
- if (two_stage && !first_stage) {
+ if (pmp_violation) {
+ cs->exception_index = RISCV_EXCP_STORE_AMO_ACCESS_FAULT;
+ } else if (two_stage && !first_stage) {
cs->exception_index = RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT;
} else {
- cs->exception_index = pmp_violation ?
- RISCV_EXCP_STORE_AMO_ACCESS_FAULT :
- RISCV_EXCP_STORE_PAGE_FAULT;
+ cs->exception_index = RISCV_EXCP_STORE_PAGE_FAULT;
}
break;
default:
--
2.34.1
