From: Jarkko Sakkinen <jarkko@kernel.org> mainline inclusion from mainline-v5.11-rc1 commit 38853a303982e3be3eccb1a1132399a5c5e2d806 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4SIGI CVE: NA -------------------------------- Add a kernel parameter to disable SGX kernel support and document it. [ bp: Massage. ] Intel-SIG: commit 38853a303982 x86/cpu/intel: Add a nosgx kernel parameter Backport for SGX Foundations support Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com> Acked-by: Jethro Beekman <jethro@fortanix.com> Tested-by: Sean Christopherson <sean.j.christopherson@intel.com> Link: https://lkml.kernel.org/r/20201112220135.165028-9-jarkko@kernel.org Signed-off-by: Fan Du <fan.du@intel.com> #openEuler_contributor Signed-off-by: Laibin Qiu <qiulaibin@huawei.com> Reviewed-by: Bamvor Zhang <bamvor.zhang@suse.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- Documentation/admin-guide/kernel-parameters.txt | 2 ++ arch/x86/kernel/cpu/feat_ctl.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index b73108a82f18..a4e5614bee12 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3498,6 +3498,8 @@ nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. + nosgx [X86-64,SGX] Disables Intel SGX kernel support. + nosmp [SMP] Tells an SMP kernel to act as a UP kernel, and disable the IO APIC. legacy for "maxcpus=0". diff --git a/arch/x86/kernel/cpu/feat_ctl.c b/arch/x86/kernel/cpu/feat_ctl.c index d38e97325018..3b1b01f2b248 100644 --- a/arch/x86/kernel/cpu/feat_ctl.c +++ b/arch/x86/kernel/cpu/feat_ctl.c @@ -99,6 +99,15 @@ static void clear_sgx_caps(void) setup_clear_cpu_cap(X86_FEATURE_SGX_LC); } +static int __init nosgx(char *str) +{ + clear_sgx_caps(); + + return 0; +} + +early_param("nosgx", nosgx); + void init_ia32_feat_ctl(struct cpuinfo_x86 *c) { bool tboot = tboot_enabled(); -- 2.20.1