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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>
This commit is contained in:
Diana Craciun 2018-12-12 16:03:04 +02:00 committed by Michael Ellerman
parent 98518c4d87
commit f633a8ad63
2 changed files with 26 additions and 0 deletions
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5
arch/powerpc/include/asm/setup.h
View File

@ -67,6 +67,11 @@ void do_barrier_nospec_fixups_range(bool enable, void *start, void *end);
static inline void do_barrier_nospec_fixups_range(bool enable, void *start, void *end) { };
#endif
#ifdef CONFIG_PPC_FSL_BOOK3E
void setup_spectre_v2(void);
#else
static inline void setup_spectre_v2(void) {};
#endif
void do_btb_flush_fixups(void);
#endif /* !__ASSEMBLY__ */

21
arch/powerpc/kernel/security.c
View File

@ -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)
{