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Peter Anvin" , "Kirill A. Shutemov" Subject: [PATCH v2 06/21] x86/virt/seamldr: Retrieve P-SEAMLDR information Date: Tue, 30 Sep 2025 19:52:50 -0700 Message-ID: <20251001025442.427697-7-chao.gao@intel.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251001025442.427697-1-chao.gao@intel.com> References: <20251001025442.427697-1-chao.gao@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" P-SEAMLDR returns its information e.g., version and supported features, in response to the SEAMLDR.INFO SEAMCALL. This information is useful for userspace. For example, the admin can decide which TDX module versions are compatible with the P-SEAMLDR according to the P-SEAMLDR version. Add and export seamldr_get_info() which retrieves P-SEAMLDR information by invoking SEAMLDR.INFO SEAMCALL in preparation for exposing P-SEAMLDR version and other necessary information to userspace. Signed-off-by: Chao Gao Tested-by: Farrah Chen --- arch/x86/include/asm/seamldr.h | 27 +++++++++++++++++++++++++++ arch/x86/virt/vmx/tdx/seamldr.c | 17 ++++++++++++++++- 2 files changed, 43 insertions(+), 1 deletion(-) create mode 100644 arch/x86/include/asm/seamldr.h diff --git a/arch/x86/include/asm/seamldr.h b/arch/x86/include/asm/seamldr.h new file mode 100644 index 000000000000..d1e9f6e16e8d --- /dev/null +++ b/arch/x86/include/asm/seamldr.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_SEAMLDR_H +#define _ASM_X86_SEAMLDR_H + +#include + +struct seamldr_info { + u32 version; + u32 attributes; + u32 vendor_id; + u32 build_date; + u16 build_num; + u16 minor_version; + u16 major_version; + u16 update_version; + u8 reserved0[4]; + u32 num_remaining_updates; + u8 reserved1[224]; +} __packed; + +#ifdef CONFIG_INTEL_TDX_MODULE_UPDATE +const struct seamldr_info *seamldr_get_info(void); +#else +static inline const struct seamldr_info *seamldr_get_info(void) { return N= ULL; } +#endif + +#endif diff --git a/arch/x86/virt/vmx/tdx/seamldr.c b/arch/x86/virt/vmx/tdx/seamld= r.c index b99d73f7bb08..08c2e3fe6071 100644 --- a/arch/x86/virt/vmx/tdx/seamldr.c +++ b/arch/x86/virt/vmx/tdx/seamldr.c @@ -9,9 +9,16 @@ #include #include =20 +#include + #include "seamcall.h" =20 -static __maybe_unused int seamldr_call(u64 fn, struct tdx_module_args *arg= s) +/* P-SEAMLDR SEAMCALL leaf function */ +#define P_SEAMLDR_INFO 0x8000000000000000 + +static struct seamldr_info seamldr_info __aligned(256); + +static inline int seamldr_call(u64 fn, struct tdx_module_args *args) { unsigned long flags; u64 vmcs; @@ -54,3 +61,11 @@ static __maybe_unused int seamldr_call(u64 fn, struct td= x_module_args *args) WARN_ONCE(1, "Failed to save/restore the current VMCS"); return -EIO; } + +const struct seamldr_info *seamldr_get_info(void) +{ + struct tdx_module_args args =3D { .rcx =3D __pa(&seamldr_info) }; + + return seamldr_call(P_SEAMLDR_INFO, &args) ? NULL : &seamldr_info; +} +EXPORT_SYMBOL_GPL_FOR_MODULES(seamldr_get_info, "tdx-host"); --=20 2.47.3