[Qemu-devel] [PATCH] target/riscv: don't overwrite priv_version and resetvec when realizing

[Ivan Grokhotkov]

CPU-specific init functions (riscv_*_cpu_init) configure members of
CPURISCVState, such as priv_version and resetvec. However
riscv_cpu_realize unconditionally overwrites these members. The
result is that some CPUs (such as CPU_SIFIVE_U34) are getting created
with incorrect priv_version.

Only set priv_version in riscv_cpu_realize if priv_spec property was
set. Don't set resetvec in riscv_cpu_realize, rely on the init
function to set it. Set default priv_version and resetvec in init
functions where this was missing.

Signed-off-by: Ivan Grokhotkov <address@hidden>
---
target/riscv/cpu.c | 12 +++++++-----
target/riscv/cpu.h |  1 +
2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index f8d07bd20a..cded5bac22 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -110,7 +110,7 @@ static void riscv_any_cpu_init(Object *obj)
{
     CPURISCVState *env = &RISCV_CPU(obj)->env;
     set_misa(env, RVXLEN | RVI | RVM | RVA | RVF | RVD | RVC | RVU);
-    set_priv_version(env, PRIV_VERSION_1_11_0);
+    set_priv_version(env, PRIV_VERSION_DEFAULT);
     set_resetvec(env, DEFAULT_RSTVEC);
}

@@ -119,6 +119,8 @@ static void riscv_any_cpu_init(Object *obj)
static void riscv_base32_cpu_init(Object *obj)
{
     CPURISCVState *env = &RISCV_CPU(obj)->env;
+    set_priv_version(env, PRIV_VERSION_DEFAULT);
+       set_resetvec(env, DEFAULT_RSTVEC);
     /* We set this in the realise function */
     set_misa(env, 0);
}
@@ -157,6 +159,8 @@ static void rv32imacu_nommu_cpu_init(Object *obj)
static void riscv_base64_cpu_init(Object *obj)
{
     CPURISCVState *env = &RISCV_CPU(obj)->env;
+    set_priv_version(env, PRIV_VERSION_DEFAULT);
+       set_resetvec(env, DEFAULT_RSTVEC);
     /* We set this in the realise function */
     set_misa(env, 0);
}
@@ -316,7 +320,7 @@ static void riscv_cpu_realize(DeviceState *dev, Error 
**errp)
     RISCVCPU *cpu = RISCV_CPU(dev);
     CPURISCVState *env = &cpu->env;
     RISCVCPUClass *mcc = RISCV_CPU_GET_CLASS(dev);
-    int priv_version = PRIV_VERSION_1_11_0;
+    int priv_version = PRIV_VERSION_DEFAULT;
     target_ulong target_misa = 0;
     Error *local_err = NULL;

@@ -339,11 +343,9 @@ static void riscv_cpu_realize(DeviceState *dev, Error 
**errp)
                        cpu->cfg.priv_spec);
             return;
         }
+        set_priv_version(env, priv_version);
     }

-    set_priv_version(env, priv_version);
-    set_resetvec(env, DEFAULT_RSTVEC);
-
     if (cpu->cfg.mmu) {
         set_feature(env, RISCV_FEATURE_MMU);
     }
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 0adb307f32..88a52a1c8c 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -81,6 +81,7 @@ enum {
#define PRIV_VERSION_1_09_1 0x00010901
#define PRIV_VERSION_1_10_0 0x00011000
#define PRIV_VERSION_1_11_0 0x00011100
+#define PRIV_VERSION_DEFAULT PRIV_VERSION_1_11_0

#define TRANSLATE_PMP_FAIL 2
#define TRANSLATE_FAIL 1
-- 
2.20.1 (Apple Git-117)

I couldn’t find an existing place where a unit test for correct priv_version 
could be added, but would be happy to do so if poked in the right direction. 
Thanks.

---
Best regards,
Ivan Grokhotkov