[PATCH v10 01/21] target/riscv: expose *envcfg csr and priv to qemu-user as well

[Deepak Gupta]

Execution environment config CSR controlling user env and current
privilege state shouldn't be limited to qemu-system only. *envcfg
CSRs control enabling of features in next lesser mode. In some cases
bits *envcfg CSR can be lit up by kernel as part of kernel policy or
software (user app) can choose to opt-in by issuing a system call
(e.g. prctl). In case of qemu-user, it should be no different because
qemu is providing underlying execution environment facility and thus
either should provide some default value in *envcfg CSRs or react to
system calls (prctls) initiated from application.

`henvcfg` has been left for qemu-system only because it is not expected
that someone will use qemu-user where application is expected to have
hypervisor underneath which is controlling its execution environment. If
such a need arises then `henvcfg` could be exposed as well.

Relevant discussion:
CAKmqyKOTVWPFep2msTQVdUmJErkH+bqCcKEQ4hAnyDFPdWKe0Q@mail.gmail.com/">https://lore.kernel.org/all/CAKmqyKOTVWPFep2msTQVdUmJErkH+bqCcKEQ4hAnyDFPdWKe0Q@mail.gmail.com/

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/riscv/cpu.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 87742047ce..270a2a031c 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -226,8 +226,12 @@ struct CPUArchState {
     uint32_t elf_flags;
 #endif
 
-#ifndef CONFIG_USER_ONLY
     target_ulong priv;
+    /* CSRs for execution environment configuration */
+    uint64_t menvcfg;
+    target_ulong senvcfg;
+
+#ifndef CONFIG_USER_ONLY
     /* This contains QEMU specific information about the virt state. */
     bool virt_enabled;
     target_ulong geilen;
@@ -429,12 +433,9 @@ struct CPUArchState {
     target_ulong upmmask;
     target_ulong upmbase;
 
-    /* CSRs for execution environment configuration */
-    uint64_t menvcfg;
     uint64_t mstateen[SMSTATEEN_MAX_COUNT];
     uint64_t hstateen[SMSTATEEN_MAX_COUNT];
     uint64_t sstateen[SMSTATEEN_MAX_COUNT];
-    target_ulong senvcfg;
     uint64_t henvcfg;
 #endif
     target_ulong cur_pmmask;
-- 
2.44.0