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x86/cpu/intel: Add a nosgx kernel parameter

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Add a kernel parameter to disable SGX kernel support and document it.

 [ bp: Massage. ]

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
This commit is contained in:
Jarkko Sakkinen 2020-11-13 00:01:19 +02:00 committed by Borislav Petkov
parent 224ab3527f
commit 38853a3039
2 changed files with 11 additions and 0 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
View file

@ -3368,6 +3368,8 @@
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".

9
arch/x86/kernel/cpu/feat_ctl.c
View file

@ -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();