[PATCH 14/16] target/riscv: adapt 'riscv_isa_string' for KVM

[Daniel Henrique Barboza]

KVM is not using the same attributes as TCG, i.e. it doesn't use
isa_edata_arr[]. Add a new kvm_riscv_isa_string_ext() helper that does
basically the same thing, but using KVM internals instead.

The decision to add this helper target/riscv/kvm.c is to foster the
separation between KVM and TCG logic, while still using
riscv_isa_string_ext() from target/riscv/cpu.c to retrieve the string
to not overcomplicate things.

Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
---
 target/riscv/cpu.c       |  5 +++++
 target/riscv/kvm.c       | 19 +++++++++++++++++++
 target/riscv/kvm_riscv.h |  2 ++
 3 files changed, 26 insertions(+)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 3c348049a3..ec1d0c621a 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -1956,6 +1956,11 @@ static void riscv_isa_string_ext(RISCVCPU *cpu, char 
**isa_str,
     char *new = *isa_str;
     int i;
 
+    if (riscv_running_KVM()) {
+        kvm_riscv_isa_string_ext(cpu, isa_str, max_str_len);
+        return;
+    }
+
     for (i = 0; i < ARRAY_SIZE(isa_edata_arr); i++) {
         if (cpu->env.priv_ver >= isa_edata_arr[i].min_version &&
             isa_ext_is_enabled(cpu, &isa_edata_arr[i])) {
diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
index b4193a10d8..675e18df3b 100644
--- a/target/riscv/kvm.c
+++ b/target/riscv/kvm.c
@@ -320,6 +320,25 @@ static void kvm_riscv_add_cpu_user_properties(Object 
*cpu_obj)
     }
 }
 
+void kvm_riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str,
+                              int max_str_len)
+{
+    char *old = *isa_str;
+    char *new = *isa_str;
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(kvm_multi_ext_cfgs); i++) {
+        RISCVCPUMultiExtConfig *multi_ext_cfg = &kvm_multi_ext_cfgs[i];
+        if (kvm_cpu_cfg_get(cpu, multi_ext_cfg)) {
+            new = g_strconcat(old, "_", multi_ext_cfg->name, NULL);
+            g_free(old);
+            old = new;
+        }
+    }
+
+    *isa_str = new;
+}
+
 static int kvm_riscv_get_regs_core(CPUState *cs)
 {
     int ret = 0;
diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
index e3ba935808..1a12efa8db 100644
--- a/target/riscv/kvm_riscv.h
+++ b/target/riscv/kvm_riscv.h
@@ -20,6 +20,8 @@
 #define QEMU_KVM_RISCV_H
 
 void kvm_riscv_init_user_properties(Object *cpu_obj);
+void kvm_riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str,
+                              int max_str_len);
 void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
 void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level);
 
-- 
2.40.1