x86/virt/tdx: Make INTEL_TDX_HOST depend on X86_X2APIC

TDX capable platforms are locked to X2APIC mode and cannot fall back to
the legacy xAPIC mode when TDX is enabled by the BIOS.  TDX host support
requires x2APIC.  Make INTEL_TDX_HOST depend on X86_X2APIC.

Signed-off-by: Kai Huang <kai.huang@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Link: https://lore.kernel.org/lkml/ba80b303-31bf-d44a-b05d-5c0f83038798@intel.com/
Link: https://lore.kernel.org/all/20231208170740.53979-3-dave.hansen%40intel.com

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 3762f41bb092971e3f6180f057b49742014e5f11..eb6e63956d51e453a78abfefc924e4bcb021c2a7 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1970,6 +1970,7 @@ config INTEL_TDX_HOST
        depends on CPU_SUP_INTEL
        depends on X86_64
        depends on KVM_INTEL
+       depends on X86_X2APIC
        help
          Intel Trust Domain Extensions (TDX) protects guest VMs from malicious
          host and certain physical attacks.  This option enables necessary TDX