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Peter Anvin" Subject: [PATCH v9 16/23] x86/virt/seamldr: Install a new TDX module Date: Wed, 13 May 2026 08:09:59 -0700 Message-ID: <20260513151045.1420990-17-chao.gao@intel.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260513151045.1420990-1-chao.gao@intel.com> References: <20260513151045.1420990-1-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: 8bit Following the shutdown of the existing TDX module, the update process continues with installing the new module. P-SEAMLDR provides the SEAMLDR.INSTALL SEAMCALL to perform this installation, which must be executed on all CPUs. Implement SEAMLDR.INSTALL and execute it on every CPU. Signed-off-by: Chao Gao Reviewed-by: Tony Lindgren Reviewed-by: Kai Huang Reviewed-by: Xu Yilun Reviewed-by: Kiryl Shutsemau (Meta) Reviewed-by: Rick Edgecombe --- v9: - Add a comment above seamldr_install() --- arch/x86/virt/vmx/tdx/seamldr.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/x86/virt/vmx/tdx/seamldr.c b/arch/x86/virt/vmx/tdx/seamldr.c index 6114cab46196..9d0e7e8c6c20 100644 --- a/arch/x86/virt/vmx/tdx/seamldr.c +++ b/arch/x86/virt/vmx/tdx/seamldr.c @@ -19,6 +19,7 @@ /* P-SEAMLDR SEAMCALL leaf function */ #define P_SEAMLDR_INFO 0x8000000000000000 +#define P_SEAMLDR_INSTALL 0x8000000000000001 #define SEAMLDR_MAX_NR_MODULE_PAGES 496 #define SEAMLDR_MAX_NR_SIG_PAGES 1 @@ -74,6 +75,15 @@ int seamldr_get_info(struct seamldr_info *seamldr_info) } EXPORT_SYMBOL_FOR_MODULES(seamldr_get_info, "tdx-host"); +/* Call into P-SEAMLDR to install a TDX module update */ +static int seamldr_install(const struct seamldr_params *params) +{ + struct tdx_module_args args = {}; + + args.rcx = __pa(params); + return seamldr_call(P_SEAMLDR_INSTALL, &args); +} + #define TDX_IMAGE_VERSION_2 0x200 struct tdx_image_header { @@ -166,6 +176,7 @@ static int init_seamldr_params(struct seamldr_params *params, const u8 *data, u3 enum module_update_state { MODULE_UPDATE_START, MODULE_UPDATE_SHUTDOWN, + MODULE_UPDATE_CPU_INSTALL, MODULE_UPDATE_DONE, }; @@ -240,6 +251,9 @@ static int do_seamldr_install_module(void *seamldr_params) if (primary) ret = tdx_module_shutdown(); break; + case MODULE_UPDATE_CPU_INSTALL: + ret = seamldr_install(seamldr_params); + break; default: break; } -- 2.52.0