Commit 815069ca authored by Michal Suchanek's avatar Michal Suchanek Committed by Michael Ellerman

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: default avatarMichal Suchanek <>
Signed-off-by: default avatarMichael Ellerman <>
parent 2eea7f06
......@@ -53,6 +53,13 @@ enum l1d_flush_type {
void setup_rfi_flush(enum l1d_flush_type, bool enable);
void do_rfi_flush_fixups(enum l1d_flush_type types);
void do_barrier_nospec_fixups(bool enable);
extern bool barrier_nospec_enabled;
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 /* !__ASSEMBLY__ */
......@@ -72,6 +72,12 @@ int module_finalize(const Elf_Ehdr *hdr,
(void *)sect->sh_addr,
(void *)sect->sh_addr + sect->sh_size);
sect = find_section(hdr, sechdrs, "__spec_barrier_fixup");
if (sect != NULL)
(void *)sect->sh_addr,
(void *)sect->sh_addr + sect->sh_size);
sect = find_section(hdr, sechdrs, "__lwsync_fixup");
......@@ -14,7 +14,7 @@
unsigned long powerpc_security_features __read_mostly = SEC_FTR_DEFAULT;
static bool barrier_nospec_enabled;
bool barrier_nospec_enabled;
static void enable_barrier_nospec(bool enable)
......@@ -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)
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