linux-kernel - [PATCH 1/6] x86/virt/tdx: Move bit definitions of TDX

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Message-Id: <20251202050844.2520762-2-yilun.xu@linux.intel.com>
Date: Tue,  2 Dec 2025 13:08:39 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
To: x86@...nel.org,
	dave.hansen@...ux.intel.com,
	kas@...nel.org,
	linux-kernel@...r.kernel.org
Cc: chao.gao@...el.com,
	rick.p.edgecombe@...el.com,
	dan.j.williams@...el.com,
	baolu.lu@...ux.intel.com,
	yilun.xu@...ux.intel.com,
	yilun.xu@...el.com,
	zhenzhong.duan@...el.com,
	kvm@...r.kernel.org,
	adrian.hunter@...el.com
Subject: [PATCH 1/6] x86/virt/tdx: Move bit definitions of TDX_FEATURES0 to public header

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@...ux.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 6b338d7f01b7..96565f6b69b9 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -148,6 +148,10 @@ 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