[PATCH v2] target/riscv/kvm/kvm-cpu.c: kvm_riscv_handle_sbi() fail with vendor-specific SBI

[Alexei Filippov]

kvm_riscv_handle_sbi() may return not supported return code to not trigger
qemu abort with vendor-specific sbi.

Added SBI related return code's defines.

Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
Fixes: 4eb47125 ("target/riscv: Handle KVM_EXIT_RISCV_SBI exit")
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---

Changes since v1:
        -Add Fixes and Revied-by lines.
 target/riscv/kvm/kvm-cpu.c         |  5 +++--
 target/riscv/sbi_ecall_interface.h | 11 +++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index 6a6c6cae80..a4f84ad950 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1404,7 +1404,7 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct 
kvm_run *run)
         if (ret == sizeof(ch)) {
             run->riscv_sbi.ret[0] = ch;
         } else {
-            run->riscv_sbi.ret[0] = -1;
+            run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
         }
         ret = 0;
         break;
@@ -1412,7 +1412,8 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct 
kvm_run *run)
         qemu_log_mask(LOG_UNIMP,
                       "%s: un-handled SBI EXIT, specific reasons is %lu\n",
                       __func__, run->riscv_sbi.extension_id);
-        ret = -1;
+        run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
+        ret = 0;
         break;
     }
     return ret;
diff --git a/target/riscv/sbi_ecall_interface.h 
b/target/riscv/sbi_ecall_interface.h
index 43899d08f6..0279e92a36 100644
--- a/target/riscv/sbi_ecall_interface.h
+++ b/target/riscv/sbi_ecall_interface.h
@@ -69,4 +69,15 @@
 #define SBI_EXT_VENDOR_END              0x09FFFFFF
 /* clang-format on */
 
+/* SBI return error codes */
+#define SBI_SUCCESS                  0
+#define SBI_ERR_FAILURE             -1
+#define SBI_ERR_NOT_SUPPORTED       -2
+#define SBI_ERR_INVALID_PARAM       -3
+#define SBI_ERR_DENIED              -4
+#define SBI_ERR_INVALID_ADDRESS     -5
+#define SBI_ERR_ALREADY_AVAILABLE   -6
+#define SBI_ERR_ALREADY_STARTED     -7
+#define SBI_ERR_ALREADY_STOPPED     -8
+
 #endif
-- 
2.34.1