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Fri, 25 Sep 2026 13:18:11 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 6cwyGZN0tmqPIwAAD6G6ig (envelope-from ); Fri, 25 Sep 2026 13:18:11 +0000 From: Nikolay Borisov To: kas@kernel.org, rick.p.edgecombe@intel.com Cc: dave.hansen@linux.intel.com, xiaoyao.li@intel.com, linux-coco@lists.linux.dev, x86@kernel.org, Nikolay Borisov , =?UTF-8?q?Michal=20Koutn=C3=BD?= Subject: [PATCH v3] x86/tdx: Restrict attestation exports to the tdx-guest driver Date: Fri, 25 Sep 2026 16:18:08 +0300 Message-ID: <20260925131808.2415177-1-nik.borisov@suse.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -3.51 X-Rspamd-Queue-Id: 2E81421F38 X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spam-Level: X-Rspamd-Action: no action X-Spamd-Result: default: False [-3.51 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; RCPT_COUNT_SEVEN(0.00)[8]; RCVD_TLS_ALL(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from,2a07:de40:b281:106:10:150:64:167:received]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:dkim,suse.com:email,suse.com:mid,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; DKIM_TRACE(0.00)[suse.com:+] X-Spam-Flag: NO There are few remaining attestation related functions which are exported via EXPORT_SYMBOL_GPL, yet they are solely used by the 'tdx-guest' driver. Let's just limit their visibility by using the namespaced EXPORT_SYMBOL_FOR_MODULES. Suggested-by: Michal Koutný Signed-off-by: Nikolay Borisov --- arch/x86/coco/tdx/tdx.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c index f904a636d449..a38e44401840 100644 --- a/arch/x86/coco/tdx/tdx.c +++ b/arch/x86/coco/tdx/tdx.c @@ -139,7 +139,7 @@ int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport) return 0; } -EXPORT_SYMBOL_GPL(tdx_mcall_get_report0); +EXPORT_SYMBOL_FOR_MODULES(tdx_mcall_get_report0, "tdx-guest"); /** * tdx_mcall_extend_rtmr() - Wrapper to extend RTMR registers using @@ -175,7 +175,7 @@ int tdx_mcall_extend_rtmr(u8 index, u8 *data) return 0; } -EXPORT_SYMBOL_GPL(tdx_mcall_extend_rtmr); +EXPORT_SYMBOL_FOR_MODULES(tdx_mcall_extend_rtmr, "tdx-guest"); /** * tdx_hcall_get_quote() - Wrapper to request TD Quote using GetQuote @@ -196,7 +196,7 @@ u64 tdx_hcall_get_quote(u8 *buf, size_t size) /* Since buf is a shared memory, set the shared (decrypted) bits */ return _tdx_hypercall(TDVMCALL_GET_QUOTE, cc_mkdec(virt_to_phys(buf)), size, 0, 0); } -EXPORT_SYMBOL_GPL(tdx_hcall_get_quote); +EXPORT_SYMBOL_FOR_MODULES(tdx_hcall_get_quote, "tdx-guest"); static void __noreturn tdx_panic(const char *msg) { -- 2.55.0