[RFC PATCH v4 09/36] KVM: Introduce kvm_arch_pre_create_vcpu()

[Xiaoyao Li <xiaoyao.li@xxxxxxxxx>]

Introduce kvm_arch_pre_create_vcpu(), to perform arch-dependent
work prior to create any vcpu. This is for i386 TDX because it needs
call TDX_INIT_VM before creating any vcpu.

Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
 accel/kvm/kvm-all.c  | 12 ++++++++++++
 include/sysemu/kvm.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 32e177bd26b4..e6fa9d23207a 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -457,6 +457,11 @@ static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id)
     return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id);
 }
 
+int __attribute__ ((weak)) kvm_arch_pre_create_vcpu(CPUState *cpu)
+{
+    return 0;
+}
+
 int kvm_init_vcpu(CPUState *cpu, Error **errp)
 {
     KVMState *s = kvm_state;
@@ -465,6 +470,13 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp)
 
     trace_kvm_init_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
 
+    ret = kvm_arch_pre_create_vcpu(cpu);
+    if (ret < 0) {
+        error_setg_errno(errp, -ret,
+                         "kvm_init_vcpu: kvm_arch_pre_create_vcpu() failed");
+        goto err;
+    }
+
     ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu));
     if (ret < 0) {
         error_setg_errno(errp, -ret, "kvm_init_vcpu: kvm_get_vcpu failed (%lu)",
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index a783c7886811..0e94031ab7c7 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -373,6 +373,7 @@ int kvm_arch_put_registers(CPUState *cpu, int level);
 
 int kvm_arch_init(MachineState *ms, KVMState *s);
 
+int kvm_arch_pre_create_vcpu(CPUState *cpu);
 int kvm_arch_init_vcpu(CPUState *cpu);
 int kvm_arch_destroy_vcpu(CPUState *cpu);
 
-- 
2.27.0