linux-kernel - [PATCH] RISC-V: Enable Zicbom in usermode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20241025091527.57825-1-cuiyunhui@bytedance.com>
Date: Fri, 25 Oct 2024 17:15:27 +0800
From: Yunhui Cui <cuiyunhui@...edance.com>
To: punit.agrawal@...edance.com,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	conor@...nel.org,
	cleger@...osinc.com,
	charlie@...osinc.com,
	evan@...osinc.com,
	samuel.holland@...ive.com,
	andybnac@...il.com,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Yunhui Cui <cuiyunhui@...edance.com>
Subject: [PATCH] RISC-V: Enable Zicbom in usermode

Like Zicboz, by enabling the corresponding bits of senvcfg,
the instructions cbo.clean, cbo.flush, and cbo.inval can be
executed normally in user mode.

Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
---
 arch/riscv/kernel/cpufeature.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 1992ea64786e..bc850518ab41 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -924,7 +924,7 @@ unsigned long riscv_get_elf_hwcap(void)
 void __init riscv_user_isa_enable(void)
 {
 	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZICBOZ))
-		current->thread.envcfg |= ENVCFG_CBZE;
+		current->thread.envcfg |= ENVCFG_CBIE | ENVCFG_CBCFE | ENVCFG_CBZE;
 	else if (any_cpu_has_zicboz)
 		pr_warn("Zicboz disabled as it is unavailable on some harts\n");
 }
-- 
2.39.2