Merge tag 'powerpc-4.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:
 "Notable changes:

   - Support for split PMD page table lock on 64-bit Book3S (Power8/9).

   - Add support for HAVE_RELIABLE_STACKTRACE, so we properly support
     live patching again.

   - Add support for patching barrier_nospec in copy_from_user() and
     syscall entry.

   - A couple of fixes for our data breakpoints on Book3S.

   - A series from Nick optimising TLB/mm handling with the Radix MMU.

   - Numerous small cleanups to squash sparse/gcc warnings from Mathieu
     Malaterre.

   - Several series optimising various parts of the 32-bit code from
     Christophe Leroy.

   - Removal of support for two old machines, "SBC834xE" and "C2K"
     ("GEFanuc,C2K"), which is why the diffstat has so many deletions.

  And many other small improvements & fixes.

  There's a few out-of-area changes. Some minor ftrace changes OK'ed by
  Steve, and a fix to our powernv cpuidle driver. Then there's a series
  touching mm, x86 and fs/proc/task_mmu.c, which cleans up some details
  around pkey support. It was ack'ed/reviewed by Ingo & Dave and has
  been in next for several weeks.

  Thanks to: Akshay Adiga, Alastair D'Silva, Alexey Kardashevskiy, Al
  Viro, Andrew Donnellan, Aneesh Kumar K.V, Anju T Sudhakar, Arnd
  Bergmann, Balbir Singh, Cédric Le Goater, Christophe Leroy, Christophe
  Lombard, Colin Ian King, Dave Hansen, Fabio Estevam, Finn Thain,
  Frederic Barrat, Gautham R. Shenoy, Haren Myneni, Hari Bathini, Ingo
  Molnar, Jonathan Neuschäfer, Josh Poimboeuf, Kamalesh Babulal,
  Madhavan Srinivasan, Mahesh Salgaonkar, Mark Greer, Mathieu Malaterre,
  Matthew Wilcox, Michael Neuling, Michal Suchanek, Naveen N. Rao,
  Nicholas Piggin, Nicolai Stange, Olof Johansson, Paul Gortmaker, Paul
  Mackerras, Peter Rosin, Pridhiviraj Paidipeddi, Ram Pai, Rashmica
  Gupta, Ravi Bangoria, Russell Currey, Sam Bobroff, Samuel
  Mendoza-Jonas, Segher Boessenkool, Shilpasri G Bhat, Simon Guo,
  Souptick Joarder, Stewart Smith, Thiago Jung Bauermann, Torsten Duwe,
  Vaibhav Jain, Wei Yongjun, Wolfram Sang, Yisheng Xie, YueHaibing"

* tag 'powerpc-4.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (251 commits)
  powerpc/64s/radix: Fix missing ptesync in flush_cache_vmap
  cpuidle: powernv: Fix promotion from snooze if next state disabled
  powerpc: fix build failure by disabling attribute-alias warning in pci_32
  ocxl: Fix missing unlock on error in afu_ioctl_enable_p9_wait()
  powerpc-opal: fix spelling mistake "Uniterrupted" -> "Uninterrupted"
  powerpc: fix spelling mistake: "Usupported" -> "Unsupported"
  powerpc/pkeys: Detach execute_only key on !PROT_EXEC
  powerpc/powernv: copy/paste - Mask SO bit in CR
  powerpc: Remove core support for Marvell mv64x60 hostbridges
  powerpc/boot: Remove core support for Marvell mv64x60 hostbridges
  powerpc/boot: Remove support for Marvell mv64x60 i2c controller
  powerpc/boot: Remove support for Marvell MPSC serial controller
  powerpc/embedded6xx: Remove C2K board support
  powerpc/lib: optimise PPC32 memcmp
  powerpc/lib: optimise 32 bits __clear_user()
  powerpc/time: inline arch_vtime_task_switch()
  powerpc/Makefile: set -mcpu=860 flag for the 8xx
  powerpc: Implement csum_ipv6_magic in assembly
  powerpc/32: Optimise __csum_partial()
  powerpc/lib: Adjust .balign inside string functions for PPC32
  ...

1 files changed, 54 insertions, 6 deletions

diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c
index e1bcdc32a851..8b69f868298c 100644
--- a/arch/powerpc/lib/feature-fixups.c
+++ b/arch/powerpc/lib/feature-fixups.c
@@ -277,6 +277,43 @@ void do_rfi_flush_fixups(enum l1d_flush_type types)
 		(types &  L1D_FLUSH_MTTRIG)     ? "mttrig type"
 						: "unknown");
 }
+
+void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
+{
+	unsigned int instr, *dest;
+	long *start, *end;
+	int i;
+
+	start = fixup_start;
+	end = fixup_end;
+
+	instr = 0x60000000; /* nop */
+
+	if (enable) {
+		pr_info("barrier-nospec: using ORI speculation barrier\n");
+		instr = 0x63ff0000; /* ori 31,31,0 speculation barrier */
+	}
+
+	for (i = 0; start < end; start++, i++) {
+		dest = (void *)start + *start;
+
+		pr_devel("patching dest %lx\n", (unsigned long)dest);
+		patch_instruction(dest, instr);
+	}
+
+	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)
@@ -400,7 +437,7 @@ static void test_basic_patching(void)
 	extern unsigned int end_ftr_fixup_test1[];
 	extern unsigned int ftr_fixup_test1_orig[];
 	extern unsigned int ftr_fixup_test1_expected[];
-	int size = end_ftr_fixup_test1 - ftr_fixup_test1;
+	int size = 4 * (end_ftr_fixup_test1 - ftr_fixup_test1);
 
 	fixup.value = fixup.mask = 8;
 	fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1);
@@ -432,7 +469,7 @@ static void test_alternative_patching(void)
 	extern unsigned int ftr_fixup_test2_orig[];
 	extern unsigned int ftr_fixup_test2_alt[];
 	extern unsigned int ftr_fixup_test2_expected[];
-	int size = end_ftr_fixup_test2 - ftr_fixup_test2;
+	int size = 4 * (end_ftr_fixup_test2 - ftr_fixup_test2);
 
 	fixup.value = fixup.mask = 0xF;
 	fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1);
@@ -464,7 +501,7 @@ static void test_alternative_case_too_big(void)
 	extern unsigned int end_ftr_fixup_test3[];
 	extern unsigned int ftr_fixup_test3_orig[];
 	extern unsigned int ftr_fixup_test3_alt[];
-	int size = end_ftr_fixup_test3 - ftr_fixup_test3;
+	int size = 4 * (end_ftr_fixup_test3 - ftr_fixup_test3);
 
 	fixup.value = fixup.mask = 0xC;
 	fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1);
@@ -491,7 +528,7 @@ static void test_alternative_case_too_small(void)
 	extern unsigned int ftr_fixup_test4_orig[];
 	extern unsigned int ftr_fixup_test4_alt[];
 	extern unsigned int ftr_fixup_test4_expected[];
-	int size = end_ftr_fixup_test4 - ftr_fixup_test4;
+	int size = 4 * (end_ftr_fixup_test4 - ftr_fixup_test4);
 	unsigned long flag;
 
 	/* Check a high-bit flag */
@@ -525,7 +562,7 @@ static void test_alternative_case_with_branch(void)
 	extern unsigned int ftr_fixup_test5[];
 	extern unsigned int end_ftr_fixup_test5[];
 	extern unsigned int ftr_fixup_test5_expected[];
-	int size = end_ftr_fixup_test5 - ftr_fixup_test5;
+	int size = 4 * (end_ftr_fixup_test5 - ftr_fixup_test5);
 
 	check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0);
 }
@@ -535,11 +572,21 @@ static void test_alternative_case_with_external_branch(void)
 	extern unsigned int ftr_fixup_test6[];
 	extern unsigned int end_ftr_fixup_test6[];
 	extern unsigned int ftr_fixup_test6_expected[];
-	int size = end_ftr_fixup_test6 - ftr_fixup_test6;
+	int size = 4 * (end_ftr_fixup_test6 - ftr_fixup_test6);
 
 	check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0);
 }
 
+static void test_alternative_case_with_branch_to_end(void)
+{
+	extern unsigned int ftr_fixup_test7[];
+	extern unsigned int end_ftr_fixup_test7[];
+	extern unsigned int ftr_fixup_test7_expected[];
+	int size = 4 * (end_ftr_fixup_test7 - ftr_fixup_test7);
+
+	check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0);
+}
+
 static void test_cpu_macros(void)
 {
 	extern u8 ftr_fixup_test_FTR_macros[];
@@ -595,6 +642,7 @@ static int __init test_feature_fixups(void)
 	test_alternative_case_too_small();
 	test_alternative_case_with_branch();
 	test_alternative_case_with_external_branch();
+	test_alternative_case_with_branch_to_end();
 	test_cpu_macros();
 	test_fw_macros();
 	test_lwsync_macros();