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| author |   Diana Craciun <diana.craciun@nxp.com> | 2018-12-12 16:03:04 +0200 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-12-20 22:59:03 +1100 |
| commit | f633a8ad636efb5d4bba1a047d4a0f1ef719aa06 (patch) | |
| tree | d175e1924324b4e4d171320e8b85b52f683f0007 /arch/powerpc/kernel | |
| parent | powerpc/fsl: Emulate SPRN_BUCSR register (diff) | |
| download | linux-dev-f633a8ad636efb5d4bba1a047d4a0f1ef719aa06.tar.xz linux-dev-f633a8ad636efb5d4bba1a047d4a0f1ef719aa06.zip | |
powerpc/fsl: Add nospectre_v2 command line argument
When the command line argument is present, the Spectre variant 2
mitigations are disabled.
Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/security.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c index 9e5f949a7ed8..9ab771b1aebb 100644 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -27,6 +27,10 @@ static enum count_cache_flush_type count_cache_flush_type = COUNT_CACHE_FLUSH_NO bool barrier_nospec_enabled; static bool no_nospec; +static bool btb_flush_enabled; +#ifdef CONFIG_PPC_FSL_BOOK3E +static bool no_spectrev2; +#endif static void enable_barrier_nospec(bool enable) { @@ -102,6 +106,23 @@ static __init int barrier_nospec_debugfs_init(void) device_initcall(barrier_nospec_debugfs_init); #endif /* CONFIG_DEBUG_FS */ +#ifdef CONFIG_PPC_FSL_BOOK3E +static int __init handle_nospectre_v2(char *p) +{ + no_spectrev2 = true; + + return 0; +} +early_param("nospectre_v2", handle_nospectre_v2); +void setup_spectre_v2(void) +{ + if (no_spectrev2) + do_btb_flush_fixups(); + else + btb_flush_enabled = true; +} +#endif /* CONFIG_PPC_FSL_BOOK3E */ + #ifdef CONFIG_PPC_BOOK3S_64 ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf) { |