kvm/i386: Set proper nested state format for SVM

Currently, the nested state format is hardcoded to VMX. This will result
in kvm_put_nested_state() returning an error because the KVM SVM support
checks for the nested state to be KVM_STATE_NESTED_FORMAT_SVM. As a
result, kvm_arch_put_registers() errors out early.

Update the setting of the format based on the virtualization feature:
  VMX - KVM_STATE_NESTED_FORMAT_VMX
  SVM - KVM_STATE_NESTED_FORMAT_SVM

Also, fix the code formatting while at it.

Fixes: b16c0e2 ("KVM: add support for AMD nested live migration")
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <fe53d00fe0d884e812960781284cd48ae9206acc.1605546140.git.thomas.lendacky@amd.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/i386/kvm.c

@@ -1820,12 +1820,14 @@ int kvm_arch_init_vcpu(CPUState *cs)
 
             env->nested_state = g_malloc0(max_nested_state_len);
             env->nested_state->size = max_nested_state_len;
-            env->nested_state->format = KVM_STATE_NESTED_FORMAT_VMX;
 
             if (cpu_has_vmx(env)) {
-                    vmx_hdr = &env->nested_state->hdr.vmx;
-                    vmx_hdr->vmxon_pa = -1ull;
-                    vmx_hdr->vmcs12_pa = -1ull;
+                env->nested_state->format = KVM_STATE_NESTED_FORMAT_VMX;
+                vmx_hdr = &env->nested_state->hdr.vmx;
+                vmx_hdr->vmxon_pa = -1ull;
+                vmx_hdr->vmcs12_pa = -1ull;
+            } else {
+                env->nested_state->format = KVM_STATE_NESTED_FORMAT_SVM;
             }
         }
     }