KVM: x86: Revert kvm_x86_ops.mem_enc_ioctl() back to an OPTIONAL hook

JIRA: https://issues.redhat.com/browse/RHEL-47242

commit f2d7993
Author: Sean Christopherson <seanjc@google.com>
Date:   Fri May 2 13:34:21 2025 -0700

    KVM: x86: Revert kvm_x86_ops.mem_enc_ioctl() back to an OPTIONAL hook

    Restore KVM's handling of a NULL kvm_x86_ops.mem_enc_ioctl, as the hook is
    NULL on SVM when CONFIG_KVM_AMD_SEV=n, and TDX will soon follow suit.

      ------------[ cut here ]------------
      WARNING: CPU: 0 PID: 1 at arch/x86/include/asm/kvm-x86-ops.h:130 kvm_x86_vendor_init+0x178b/0x18e0
      Modules linked in:
      CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.15.0-rc2-dc1aead1a985-sink-vm #2 NONE
      Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
      RIP: 0010:kvm_x86_vendor_init+0x178b/0x18e0
      Call Trace:
       <TASK>
       svm_init+0x2e/0x60
       do_one_initcall+0x56/0x290
       kernel_init_freeable+0x192/0x1e0
       kernel_init+0x16/0x130
       ret_from_fork+0x30/0x50
       ret_from_fork_asm+0x1a/0x30
       </TASK>
      ---[ end trace 0000000000000000 ]---

    Opportunistically drop the superfluous curly braces.

    Link: https://lore.kernel.org/all/20250318-vverma7-cleanup_x86_ops-v2-4-701e82d6b779@intel.com
    Fixes: b2aaf38 ("KVM: TDX: Add place holder for TDX VM specific mem_enc_op ioctl")
    Link: https://lore.kernel.org/r/20250502203421.865686-1-seanjc@google.com
    Signed-off-by: Sean Christopherson <seanjc@google.com>

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>

Author: Maxim Levitsky

arch/x86/include/asm/kvm-x86-ops.h

@@ -127,7 +127,7 @@ KVM_X86_OP(leave_smm)
 KVM_X86_OP(enable_smi_window)
 #endif
 KVM_X86_OP_OPTIONAL(dev_get_attr)
-KVM_X86_OP(mem_enc_ioctl)
+KVM_X86_OP_OPTIONAL(mem_enc_ioctl)
 KVM_X86_OP_OPTIONAL(vcpu_mem_enc_ioctl)
 KVM_X86_OP_OPTIONAL(mem_enc_register_region)
 KVM_X86_OP_OPTIONAL(mem_enc_unregister_region)

arch/x86/kvm/x86.c

@@ -7324,10 +7324,13 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 		r = READ_ONCE(kvm->arch.default_tsc_khz);
 		goto out;
 	}
-	case KVM_MEMORY_ENCRYPT_OP: {
+	case KVM_MEMORY_ENCRYPT_OP:
+		r = -ENOTTY;
+		if (!kvm_x86_ops.mem_enc_ioctl)
+			goto out;
+
 		r = kvm_x86_call(mem_enc_ioctl)(kvm, argp);
 		break;
-	}
 	case KVM_MEMORY_ENCRYPT_REG_REGION: {
 		struct kvm_enc_region region;