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[PATCH v3 5/6] target/riscv: Enable PC-relative translation in system mo


From: Weiwei Li
Subject: [PATCH v3 5/6] target/riscv: Enable PC-relative translation in system mode
Date: Sat, 1 Apr 2023 20:39:16 +0800

The existence of CF_PCREL can improve performance with the guest
kernel's address space randomization.  Each guest process maps
libc.so (et al) at a different virtual address, and this allows
those translations to be shared.

Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/riscv/cpu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 646fa31a59..3b562d5d9f 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -1193,6 +1193,8 @@ static void riscv_cpu_realize(DeviceState *dev, Error 
**errp)
 
 
 #ifndef CONFIG_USER_ONLY
+    cs->tcg_cflags |= CF_PCREL;
+
     if (cpu->cfg.ext_sstc) {
         riscv_timer_init(cpu);
     }
-- 
2.25.1




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