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Subject[PATCH RFC rebase 4/9] powerpc/64s: Use barrier_nospec in RFI_FLUSH_SLOT
Date
The RFI flush support patches the speculation barrier into
RFI_FLUSH_SLOT as part of the RFI flush. Use separate barrier_nospec
instead.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/include/asm/exception-64s.h | 2 +-
arch/powerpc/lib/feature-fixups.c | 9 +++------
2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 471b2274fbeb..bb5a3052b29b 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -81,9 +81,9 @@
* L1-D cache when returning to userspace or a guest.
*/
#define RFI_FLUSH_SLOT \
+ barrier_nospec_asm; \
RFI_FLUSH_FIXUP_SECTION; \
nop; \
- nop; \
nop

#define RFI_TO_KERNEL \
diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c
index 35f80ab7cbd8..4cc2f0c5c863 100644
--- a/arch/powerpc/lib/feature-fixups.c
+++ b/arch/powerpc/lib/feature-fixups.c
@@ -119,7 +119,7 @@ void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
#ifdef CONFIG_PPC_BOOK3S_64
void do_rfi_flush_fixups(enum l1d_flush_type types)
{
- unsigned int instrs[3], *dest;
+ unsigned int instrs[2], *dest;
long *start, *end;
int i;

@@ -128,15 +128,13 @@ void do_rfi_flush_fixups(enum l1d_flush_type types)

instrs[0] = 0x60000000; /* nop */
instrs[1] = 0x60000000; /* nop */
- instrs[2] = 0x60000000; /* nop */

if (types & L1D_FLUSH_FALLBACK)
- /* b .+16 to fallback flush */
- instrs[0] = 0x48000010;
+ /* b .+12 to fallback flush */
+ instrs[0] = 0x4800000c;

i = 0;
if (types & L1D_FLUSH_ORI) {
- instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
}

@@ -150,7 +148,6 @@ void do_rfi_flush_fixups(enum l1d_flush_type types)

patch_instruction(dest, instrs[0]);
patch_instruction(dest + 1, instrs[1]);
- patch_instruction(dest + 2, instrs[2]);
}

printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i,
--
2.13.6
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