[RESEND,v5,5/6] target/riscv: Enable PC-relative translation in system mode

Commit Message

Weiwei Li April 1, 2023, 12:49 p.m. UTC

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 <[e-mail]>
Signed-off-by: Junqiang Wang <[e-mail]>
Reviewed-by: LIU Zhiwei <[e-mail]>
Reviewed-by: Richard Henderson <[e-mail]>
---
 target/riscv/cpu.c | 2 ++
 1 file changed, 2 insertions(+)

Patch

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);
     }