[PATCH v4 23/66] 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>
Acked-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
---
Changes in v3:
- pass @errp to kvm_arch_pre_create_vcpu(); (Per Daniel)
---
 accel/kvm/kvm-all.c  | 10 ++++++++++
 include/sysemu/kvm.h |  1 +
 2 files changed, 11 insertions(+)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index def2b46b9de2..7b177e3ee7c5 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -418,6 +418,11 @@ 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, Error **errp)
+{
+    return 0;
+}
+
 int kvm_init_vcpu(CPUState *cpu, Error **errp)
 {
     KVMState *s = kvm_state;
@@ -426,6 +431,11 @@ 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, errp);
+    if (ret < 0) {
+        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 0e88958190a4..2f6592859ac6 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -341,6 +341,7 @@ int kvm_arch_get_default_type(MachineState *ms);
 
 int kvm_arch_init(MachineState *ms, KVMState *s);
 
+int kvm_arch_pre_create_vcpu(CPUState *cpu, Error **errp);
 int kvm_arch_init_vcpu(CPUState *cpu);
 int kvm_arch_destroy_vcpu(CPUState *cpu);
 
-- 
2.34.1