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Commit cf175dc3 authored by Diana Craciun's avatar Diana Craciun Committed by Michael Ellerman
Browse files

powerpc/64: Disable the speculation barrier from the command line 



The speculation barrier can be disabled from the command line
with the parameter: "nospectre_v1".

Signed-off-by: default avatarDiana Craciun <diana.craciun@nxp.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 0b924de4

arch/powerpc/kernel/security.c

+11 −1
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
unsigned long powerpc_security_features __read_mostly = SEC_FTR_DEFAULT;



bool barrier_nospec_enabled;

static bool no_nospec;



static void enable_barrier_nospec(bool enable)

{
@@ -42,9 +43,18 @@ void setup_barrier_nospec(void) 
	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&

		 security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR);



	if (!no_nospec)

		enable_barrier_nospec(enable);

}



static int __init handle_nospectre_v1(char *p)

{

	no_nospec = true;



	return 0;

}

early_param("nospectre_v1", handle_nospectre_v1);



#ifdef CONFIG_DEBUG_FS

static int barrier_nospec_set(void *data, u64 val)

{