Move bit definitions of TDX_FEATURES0 to TDX core public header.

Kernel users get TDX_FEATURES0 bitmap via tdx_get_sysinfo(). It is
reasonable to also public the definitions of each bit. TDX Connect (a
new TDX feature to enable Trusted I/O virtualization) will add new bits
and check them in separate kernel modules.

Take the opportunity to change its type to BIT_ULL since TDX_FEATURES0
is explicitly defined as 64-bit in both TDX Module Specification and
TDX core code.

Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
---
 arch/x86/include/asm/tdx.h  | 4 ++++
 arch/x86/virt/vmx/tdx/tdx.h | 3 ---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index e040e0467ae4..65c4da396450 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -127,6 +127,10 @@ static __always_inline u64 sc_retry(sc_func_t func, u64 fn,
 int tdx_cpu_enable(void);
 int tdx_enable(void);
 const char *tdx_dump_mce_info(struct mce *m);
+
+/* Bit definitions of TDX_FEATURES0 metadata field */
+#define TDX_FEATURES0_NO_RBP_MOD	BIT_ULL(18)
+
 const struct tdx_sys_info *tdx_get_sysinfo(void);
 
 int tdx_guest_keyid_alloc(void);
diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
index 82bb82be8567..c641b4632826 100644
--- a/arch/x86/virt/vmx/tdx/tdx.h
+++ b/arch/x86/virt/vmx/tdx/tdx.h
@@ -84,9 +84,6 @@ struct tdmr_info {
 	DECLARE_FLEX_ARRAY(struct tdmr_reserved_area, reserved_areas);
 } __packed __aligned(TDMR_INFO_ALIGNMENT);
 
-/* Bit definitions of TDX_FEATURES0 metadata field */
-#define TDX_FEATURES0_NO_RBP_MOD	BIT(18)
-
 /*
  * Do not put any hardware-defined TDX structure representations below
  * this comment!
-- 
2.25.1

On Sat, 2026-03-28 at 00:01 +0800, Xu Yilun wrote:
> Move bit definitions of TDX_FEATURES0 to TDX core public header.

Patch seems reasonable, but not sure about the "public header" language. Maybe
more widely accessibly header? Or a better name?

> 
> Kernel users get TDX_FEATURES0 bitmap via tdx_get_sysinfo(). It is
> reasonable to also public the definitions of each bit. TDX Connect (a
> new TDX feature to enable Trusted I/O virtualization) will add new bits
> and check them in separate kernel modules.
> 
> Take the opportunity to change its type to BIT_ULL since TDX_FEATURES0
> is explicitly defined as 64-bit in both TDX Module Specification and
> TDX core code.
> 
> Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
> ---

On Fri, Mar 27, 2026 at 11:45:39PM +0000, Edgecombe, Rick P wrote:
> On Sat, 2026-03-28 at 00:01 +0800, Xu Yilun wrote:
> > Move bit definitions of TDX_FEATURES0 to TDX core public header.
> 
> Patch seems reasonable, but not sure about the "public header" language. Maybe
> more widely accessibly header? Or a better name?
> 

Yes, I try to make it more explicit, is it better:

    x86/virt/tdx: Move TDX_FEATURES0 bit defines to arch x86 header

    Move TDX_FEATURES0 bit definitions to arch x86 header.

    ...