diff options
| -rw-r--r-- | lib/sbi/sbi_emulate_csr.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/lib/sbi/sbi_emulate_csr.c b/lib/sbi/sbi_emulate_csr.c index 869c81f4..3adec78d 100644 --- a/lib/sbi/sbi_emulate_csr.c +++ b/lib/sbi/sbi_emulate_csr.c @@ -66,12 +66,11 @@ int sbi_emulate_csr_read(int csr_num, struct sbi_trap_regs *regs, *csr_val = csr_read(CSR_MCYCLE); break; case CSR_TIME: + if (!hpm_allowed(csr_num - CSR_CYCLE, prev_mode, virt)) + return SBI_ENOTSUPP; /* * We emulate TIME CSR for both Host (HS/U-mode) and * Guest (VS/VU-mode). - * - * Faster TIME CSR reads are critical for good performance - * in S-mode software so we don't check CSR permissions. */ *csr_val = (virt) ? sbi_timer_virt_value(): sbi_timer_value(); |