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

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commit cf175dc315f90185128fb061dc05b6fbb211aa2f upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Diana Craciun 2019-04-22 00:20:18 +10:00 committed by Greg Kroah-Hartman
parent d000015f62
commit 58dbc8def9
1 changed files with 11 additions and 1 deletions
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12
arch/powerpc/kernel/security.c
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@ -17,6 +17,7 @@
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)
{
@ -43,9 +44,18 @@ void setup_barrier_nospec(void)
enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
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
static int barrier_nospec_set(void *data, u64 val)
{