x86/cpu: Clarify the error message when BIOS does not support SGX

JIRA: https://issues.redhat.com/browse/RHEL-22826
Upstream Status: merged into the linux.git

commit 7678a53
Author: WangYuli <wangyuli@uniontech.com>
Date:   Sun Aug 25 18:46:53 2024 +0800

    x86/cpu: Clarify the error message when BIOS does not support SGX

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

    For the kernel it's difficult to distinguish between the BIOS not
    supporting SGX and the BIOS supporting SGX but having it 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@uniontech.com>
    Co-developed-by: Zelong Xiang <xiangzelong@uniontech.com>
    Signed-off-by: Zelong Xiang <xiangzelong@uniontech.com>
    Signed-off-by: WangYuli <wangyuli@uniontech.com>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Acked-by: Kai Huang <kai.huang@intel.com>
    Link: https://lore.kernel.org/all/F8D977CB368423F3+20240825104653.1294624-1-wangyuli@uniontech.com
    Closes: linuxdeepin/developer-center#10032

Signed-off-by: Vladis Dronov <vdronov@redhat.com>

Author: nefigtut

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;
 	}