linux-kernel - [PATCH v4] x86/cpu: Adjust the error message when BIOS does not support SGX

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Message-ID: <F8D977CB368423F3+20240825104653.1294624-1-wangyuli@uniontech.com>
Date: Sun, 25 Aug 2024 18:46:53 +0800
From: WangYuli <wangyuli@...ontech.com>
To: tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	hpa@...or.com,
	wangyuli@...ontech.com,
	seanjc@...gle.com,
	xiangzelong@...ontech.com
Cc: x86@...nel.org,
	linux-kernel@...r.kernel.org,
	wubo@...ontech.com,
	guanwentao@...ontech.com,
	linux-sgx@...r.kernel.org,
	jarkko@...nel.org,
	haitao.huang@...ux.intel.com,
	sean.j.christopherson@...el.com,
	kai.huang@...el.com,
	bp@...e.de
Subject: [PATCH v4] x86/cpu: Adjust the error message when BIOS does not support SGX

When SGX is not supported by the BIOS, the kernel log still output
the error 'SGX disabled by BIOS', which can be confusing since
there might not be an SGX-related option in the BIOS settings.

As a kernel, it's difficult to distinguish between the BIOS not
supporting SGX and the BIOS supporting SGX but it's disabled.

Therefore, update the error message to
'SGX disabled or unsupported by BIOS' to make it easier for those
reading kernel logs to understand what's happening.

Reported-by: Bo Wu <wubo@...ontech.com>
Closes: https://github.com/linuxdeepin/developer-center/issues/10032
Acked-by: Kai Huang <kai.huang@...el.com>
Link: https://lore.kernel.org/all/a30f7700c7817b3e7e2f2bdb37d5c10a318b2c3b.camel@intel.com/
Co-developed-by: Zelong Xiang <xiangzelong@...ontech.com>
Signed-off-by: Zelong Xiang <xiangzelong@...ontech.com>
Signed-off-by: WangYuli <wangyuli@...ontech.com>
---
 arch/x86/kernel/cpu/feat_ctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/feat_ctl.c b/arch/x86/kernel/cpu/feat_ctl.c
index 1640ae76548f..4a4118784c13 100644
--- a/arch/x86/kernel/cpu/feat_ctl.c
+++ b/arch/x86/kernel/cpu/feat_ctl.c
@@ -188,7 +188,7 @@ void init_ia32_feat_ctl(struct cpuinfo_x86 *c)
 update_sgx:
 	if (!(msr & FEAT_CTL_SGX_ENABLED)) {
 		if (enable_sgx_kvm || enable_sgx_driver)
-			pr_err_once("SGX disabled by BIOS.\n");
+			pr_err_once("SGX disabled or unsupported by BIOS.\n");
 		clear_cpu_cap(c, X86_FEATURE_SGX);
 		return;
 	}
-- 
2.43.4