[Stable-8.2.8,42/49] target/riscv/kvm: clarify how 'riscv-aia' default works

Commit Message

Michael Tokarev Nov. 9, 2024, 10:14 a.m. UTC

From: Daniel Henrique Barboza <[e-mail]>

We do not have control in the default 'riscv-aia' default value. We can
try to set it to a specific value, in this case 'auto', but there's no
guarantee that the host will accept it.

Couple with this we're always doing a 'qemu_log' to inform whether we're
ended up using the host default or if we managed to set the AIA mode to
the QEMU default we wanted to set.

Change the 'riscv-aia' description to better reflect how the option
works, and remove the two informative 'qemu_log' that are now unneeded:
if no message shows, riscv-aia was set to the default or uset-set value.

Signed-off-by: Daniel Henrique Barboza <[e-mail]>
Acked-by: Alistair Francis <[e-mail]>
Message-ID: <[e-mail]>
Signed-off-by: Alistair Francis <[e-mail]>
(cherry picked from commit fd16cfb2995e9196b579d8885145c4247dfa6058)
Signed-off-by: Michael Tokarev <[e-mail]>

Patch

diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index daff517896..852e0cede4 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1335,9 +1335,9 @@  void kvm_arch_accel_class_init(ObjectClass *oc)
     object_class_property_add_str(oc, "riscv-aia", riscv_get_kvm_aia,
                                   riscv_set_kvm_aia);
     object_class_property_set_description(oc, "riscv-aia",
-                                          "Set KVM AIA mode. Valid values are "
-                                          "emul, hwaccel, and auto. Default "
-                                          "is auto.");
+        "Set KVM AIA mode. Valid values are 'emul', 'hwaccel' and 'auto'. "
+        "Changing KVM AIA modes relies on host support. Defaults to 'auto' "
+        "if the host supports it");
     object_property_set_default_str(object_class_property_find(oc, "riscv-aia"),
                                     "auto");
 }
@@ -1370,10 +1370,7 @@  void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift,
         exit(1);
     }
 
-    if (default_aia_mode == aia_mode) {
-        qemu_log("KVM AIA: using default host mode '%s'\n",
-                  kvm_aia_mode_str(default_aia_mode));
-    } else {
+    if (default_aia_mode != aia_mode) {
         ret = kvm_device_access(aia_fd, KVM_DEV_RISCV_AIA_GRP_CONFIG,
                                 KVM_DEV_RISCV_AIA_CONFIG_MODE,
                                 &aia_mode, true, NULL);
@@ -1385,9 +1382,6 @@  void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift,
 
             /* failed to change AIA mode, use default */
             aia_mode = default_aia_mode;
-        } else {
-            qemu_log("KVM AIA: setting current mode to %s\n",
-                     kvm_aia_mode_str(aia_mode));
         }
     }