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lib: sbi: respect scounteren when emulating timeh

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beef2f6937 ("lib: sbi: Respect scounteren when emulating the time
CSR") restored it for TIME only, so on RV32 supervisor software still
cannot restrict U-mode or VS-mode access to time: rdtime traps as
intended while rdtimeh keeps returning the upper half.

Signed-off-by: Ben Zong-You Xie <ben717@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260805093354.1022980-1-ben717@andestech.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Ben Zong-You Xie
2026-09-04 13:44:57 +05:30
committed by Anup Patel
parent c5077d497d
commit 7384968e02
1 changed files with 2 additions and 1 deletions
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lib/sbi/sbi_emulate_csr.c
+2 -1
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@@ -90,7 +90,8 @@ int sbi_emulate_csr_read(int csr_num, struct sbi_trap_regs *regs,
*csr_val = csr_read(CSR_MCYCLEH);
break;
case CSR_TIMEH:
/* Refer comments on TIME CSR above. */
if (!hpm_allowed(csr_num - CSR_CYCLEH, prev_mode, virt))
return SBI_ENOTSUPP;
*csr_val = (virt) ? sbi_timer_virt_value() >> 32:
sbi_timer_value() >> 32;
break;