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authorMichal Suchanek <msuchanek@suse.de>2018-04-24 14:15:56 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2018-06-03 20:43:44 +1000
commit815069ca57c142eb71d27439bc27f41a433a67b3 (patch)
tree776b7b8a934e55dd4aaab3e52051b8e8d895dd2d /arch/powerpc/lib
parent2eea7f067f495e33b8b116b35b5988ab2b8aec55 (diff)
powerpc/64s: Patch barrier_nospec in modules
Note that unlike RFI which is patched only in kernel the nospec state reflects settings at the time the module was loaded. Iterating all modules and re-patching every time the settings change is not implemented. Based on lwsync patching. Signed-off-by: Michal Suchanek <msuchanek@suse.de> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/lib')
-rw-r--r--arch/powerpc/lib/feature-fixups.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c
index ae911dad9b16..2b9173d09f24 100644
--- a/arch/powerpc/lib/feature-fixups.c
+++ b/arch/powerpc/lib/feature-fixups.c
@@ -163,14 +163,14 @@ void do_rfi_flush_fixups(enum l1d_flush_type types)
: "unknown");
}
-void do_barrier_nospec_fixups(bool enable)
+void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
{
unsigned int instr, *dest;
long *start, *end;
int i;
- start = PTRRELOC(&__start___barrier_nospec_fixup),
- end = PTRRELOC(&__stop___barrier_nospec_fixup);
+ start = fixup_start;
+ end = fixup_end;
instr = 0x60000000; /* nop */
@@ -189,6 +189,16 @@ void do_barrier_nospec_fixups(bool enable)
printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
}
+void do_barrier_nospec_fixups(bool enable)
+{
+ void *start, *end;
+
+ start = PTRRELOC(&__start___barrier_nospec_fixup),
+ end = PTRRELOC(&__stop___barrier_nospec_fixup);
+
+ do_barrier_nospec_fixups_range(enable, start, end);
+}
+
#endif /* CONFIG_PPC_BOOK3S_64 */
void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)