[PATCH] target/loongarch/kvm: set pv features per vCPU in kvm_arch_init_vcpu

[Tao Cui <cui.tao@linux.dev>]

From: Tao Cui <cuitao@kylinos.cn>

kvm_set_pv_features() programs the KVM_FEATURE cpucfg attribute, which is a
per-vCPU setting. It was called from kvm_arch_put_registers() under a
function-local static guard, so it ran only once for the whole VM and only
the first vCPU actually got its pv features pushed to KVM.

Move the call to kvm_arch_init_vcpu(), which runs once per vCPU, right
after the pv features are computed, and drop the static guard.

Signed-off-by: Tao Cui <cuitao@kylinos.cn>
---
 target/loongarch/kvm/kvm.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c
index d6539c12ac..985812c828 100644
--- a/target/loongarch/kvm/kvm.c
+++ b/target/loongarch/kvm/kvm.c
@@ -816,7 +816,6 @@ int kvm_arch_get_registers(CPUState *cs, Error **errp)
 int kvm_arch_put_registers(CPUState *cs, KvmPutState level, Error **errp)
 {
     int ret;
-    static int once;
 
     ret = kvm_loongarch_put_regs_core(cs);
     if (ret) {
@@ -843,14 +842,6 @@ int kvm_arch_put_registers(CPUState *cs, KvmPutState level, Error **errp)
         return ret;
     }
 
-    if (!once) {
-        ret = kvm_set_pv_features(cs);
-        if (ret) {
-            return ret;
-        }
-        once = 1;
-    }
-
     if (level >= KVM_PUT_FULL_STATE) {
         /*
          * only KVM_PUT_FULL_STATE is required, kvm kernel will clear
@@ -1209,6 +1200,12 @@ int kvm_arch_init_vcpu(CPUState *cs)
         return ret;
     }
 
+    /* pv_features is a per-vCPU attribute; set it here, once per vCPU. */
+    ret = kvm_set_pv_features(cs);
+    if (ret < 0) {
+        return ret;
+    }
+
     ret = kvm_cpu_check_ptw(cs, &local_err);
     if (ret < 0) {
         error_report_err(local_err);
-- 
2.43.0