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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: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Diana Craciun 2018-07-28 09:06:32 +10:00 committed by Michael Ellerman
parent 0b924de4f6
commit cf175dc315
1 changed files with 11 additions and 1 deletions
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12
arch/powerpc/kernel/security.c
View File

@ -16,6 +16,7 @@
unsigned long powerpc_security_features __read_mostly = SEC_FTR_DEFAULT; unsigned long powerpc_security_features __read_mostly = SEC_FTR_DEFAULT;
bool barrier_nospec_enabled; bool barrier_nospec_enabled;
static bool no_nospec;
static void enable_barrier_nospec(bool enable) static void enable_barrier_nospec(bool enable)
{ {
@ -42,9 +43,18 @@ void setup_barrier_nospec(void)
enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR); security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR);
enable_barrier_nospec(enable); 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 #ifdef CONFIG_DEBUG_FS
static int barrier_nospec_set(void *data, u64 val) static int barrier_nospec_set(void *data, u64 val)
{ {