OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	11/17/2022 06:42:16 AM	rwxr-xr-x
📄 Kbuild	294 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 a.out-core.h	1.89 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 acenv.h	1.56 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 acpi.h	4.76 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 agp.h	1.04 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 alternative-asm.h	2.43 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 alternative.h	8.28 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 amd_nb.h	2.98 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 apb_timer.h	1.43 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 apic.h	14.53 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 apic_flat_64.h	151 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 apicdef.h	11.26 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 apm.h	1.8 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 arch_hweight.h	1.28 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 archrandom.h	3.03 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 asm-offsets.h	35 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 asm-prototypes.h	946 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 asm.h	4.97 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 atomic.h	6.02 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 atomic64_32.h	8.71 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 atomic64_64.h	6.31 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 barrier.h	3.6 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 bios_ebda.h	914 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 bitops.h	13.78 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 boot.h	1.53 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 bootparam_utils.h	2.86 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 bug.h	2.07 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 bugs.h	493 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 cache.h	641 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 cacheflush.h	306 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 cacheinfo.h	209 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📄 calgary.h	2.31 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 ce4100.h	121 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 checksum.h	133 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 checksum_32.h	4.86 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 checksum_64.h	5.41 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 clocksource.h	488 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 cmdline.h	302 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 cmpxchg.h	7.68 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 cmpxchg_32.h	3.15 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 cmpxchg_64.h	543 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 compat.h	7.37 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 cpu.h	975 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 cpu_device_id.h	1.38 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 cpu_entry_area.h	2.27 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 cpufeature.h	7.75 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 cpufeatures.h	24.62 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 cpumask.h	408 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 crash.h	320 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📁 crypto	-	11/17/2022 06:42:22 AM	rwxr-xr-x
📄 current.h	443 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 debugreg.h	2.67 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 delay.h	208 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 desc.h	11.42 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 desc_defs.h	3.16 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 device.h	568 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 disabled-features.h	2.31 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 div64.h	1.79 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dma-mapping.h	2.4 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dma.h	9.58 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 dmi.h	556 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📄 dwarf2.h	2.43 KB	01/28/2018 09:20:33 PM	rw-r--r--
📁 e820	-	11/17/2022 06:42:22 AM	rwxr-xr-x
📄 edac.h	474 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 efi.h	6.9 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 elf.h	10.82 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 emergency-restart.h	202 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 entry_arch.h	1.88 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 espfix.h	426 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 exec.h	37 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 export.h	120 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 extable.h	1.27 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 fb.h	540 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 fixmap.h	6.04 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 floppy.h	6.59 KB	01/28/2018 09:20:33 PM	rw-r--r--
📁 fpu	-	11/17/2022 06:42:22 AM	rwxr-xr-x
📄 frame.h	815 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 ftrace.h	1.8 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 futex.h	2.2 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 gart.h	2.64 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 genapic.h	22 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 geode.h	842 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 hardirq.h	2.3 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 highmem.h	2.6 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 hpet.h	3.38 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 hugetlb.h	2.15 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 hw_breakpoint.h	1.96 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 hw_irq.h	3.85 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 hypervisor.h	1.84 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 i8259.h	1.93 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ia32.h	1.46 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 ia32_unistd.h	313 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 imr.h	1.81 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 inat.h	6.58 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 inat_types.h	1013 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 init.h	632 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 insn-eval.h	837 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 insn.h	7.46 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 inst.h	5.07 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 intel-family.h	3.29 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 intel-mid.h	4.91 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 intel_ds.h	793 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 intel_mid_vrtc.h	326 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 intel_pmc_ipc.h	2.08 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 intel_pt.h	292 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 intel_punit_ipc.h	4.56 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 intel_rdt_sched.h	2.59 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 intel_scu_ipc.h	2.3 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 intel_telemetry.h	3.96 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 invpcid.h	1.57 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 io.h	12.21 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 io_apic.h	5.63 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 iomap.h	1.22 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 iommu.h	392 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 iommu_table.h	3.82 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 iosf_mbi.h	5.74 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 ipi.h	2.84 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 irq.h	1.12 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 irq_regs.h	679 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 irq_remapping.h	2.96 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 irq_vectors.h	4.12 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 irq_work.h	397 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 irqdomain.h	1.61 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 irqflags.h	4.38 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 ist.h	735 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 jump_label.h	2.44 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 kasan.h	966 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 kaslr.h	424 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 kbdleds.h	454 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 kdebug.h	752 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 kexec-bzimage64.h	189 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 kexec.h	6.69 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 kgdb.h	2.09 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 kmap_types.h	289 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 kprobes.h	3.82 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 kvm_emulate.h	15.23 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 kvm_guest.h	172 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 kvm_host.h	42.72 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 kvm_page_track.h	2.48 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 kvm_para.h	3 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 kvmclock.h	170 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 linkage.h	581 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 livepatch.h	1.12 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 local.h	3.83 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 local64.h	33 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 mach_timer.h	1.55 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mach_traps.h	1013 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 math_emu.h	395 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 mc146818rtc.h	2.76 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mce.h	12.54 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 mem_encrypt.h	2.83 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 microcode.h	4.14 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 microcode_amd.h	1.41 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 microcode_intel.h	2.46 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 misc.h	143 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 mmconfig.h	374 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 mmu.h	1.57 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mmu_context.h	10.27 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 mmx.h	337 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 mmzone.h	129 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 mmzone_32.h	1.16 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mmzone_64.h	430 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 module.h	2.05 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mpspec.h	3.93 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mpspec_def.h	3.93 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mpx.h	2.97 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mshyperv.h	10.69 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 msi.h	392 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 msidef.h	1.77 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 msr-index.h	30.36 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 msr-trace.h	1.35 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 msr.h	10.85 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 mtrr.h	4.62 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mwait.h	3.74 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 nmi.h	1.39 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 nops.h	4.31 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 nospec-branch.h	10.87 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 numa.h	2.18 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 numa_32.h	256 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📁 numachip	-	11/17/2022 06:42:22 AM	rwxr-xr-x
📄 olpc.h	3.16 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 olpc_ofw.h	1.1 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 orc_lookup.h	1.63 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 orc_types.h	3.47 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 page.h	2.18 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 page_32.h	1.01 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 page_32_types.h	1.7 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 page_64.h	1.42 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 page_64_types.h	2.34 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 page_types.h	2.29 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 paravirt.h	23.31 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 paravirt_types.h	22.15 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 parport.h	314 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 pat.h	768 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📄 pci-direct.h	995 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📄 pci-functions.h	654 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 pci.h	3.51 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 pci_64.h	684 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 pci_x86.h	5.71 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 percpu.h	18.97 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 perf_event.h	8.82 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 perf_event_p4.h	26.1 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 pgalloc.h	5.57 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 pgtable-2level.h	2.75 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pgtable-2level_types.h	867 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📄 pgtable-3level.h	10.24 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pgtable-3level_types.h	1.06 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pgtable-invert.h	1.07 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pgtable.h	33.91 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pgtable_32.h	3.1 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pgtable_32_types.h	2.01 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pgtable_64.h	7.37 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pgtable_64_types.h	3.67 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pgtable_types.h	16.75 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 pkeys.h	3.17 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 platform_sst_audio.h	3.18 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 pm-trace.h	611 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 posix_types.h	144 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 preempt.h	3.04 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 probe_roms.h	273 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 processor-cyrix.h	879 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 processor-flags.h	1.71 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 processor.h	24.54 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 prom.h	1 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 proto.h	1003 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📄 pti.h	369 bytes	11/01/2022 04:52:05 PM	rw-r--r--
📄 ptrace.h	8.52 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 purgatory.h	571 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 pvclock-abi.h	1.49 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 pvclock.h	2.64 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 qrwlock.h	199 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 qspinlock.h	2.54 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 qspinlock_paravirt.h	1.85 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 realmode.h	1.76 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 reboot.h	850 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 reboot_fixups.h	183 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 refcount.h	2.83 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 required-features.h	2.81 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 rio.h	2.57 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 rmwcc.h	1.62 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 rwsem.h	7.02 KB	01/28/2018 09:20:33 PM	rw-r--r--
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Editing: nospec-branch.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _ASM_X86_NOSPEC_BRANCH_H_
#define _ASM_X86_NOSPEC_BRANCH_H_

#include <linux/static_key.h>

#include <asm/alternative.h>
#include <asm/alternative-asm.h>
#include <asm/cpufeatures.h>
#include <asm/msr-index.h>

/*
 * Fill the CPU return stack buffer.
 *
 * Each entry in the RSB, if used for a speculative 'ret', contains an
 * infinite 'pause; lfence; jmp' loop to capture speculative execution.
 *
 * This is required in various cases for retpoline and IBRS-based
 * mitigations for the Spectre variant 2 vulnerability. Sometimes to
 * eliminate potentially bogus entries from the RSB, and sometimes
 * purely to ensure that it doesn't get empty, which on some CPUs would
 * allow predictions from other (unwanted!) sources to be used.
 *
 * We define a CPP macro such that it can be used from both .S files and
 * inline assembly. It's possible to do a .macro and then include that
 * from C via asm(".include <asm/nospec-branch.h>") but let's not go there.
 */

#define RSB_CLEAR_LOOPS		32	/* To forcibly overwrite all entries */
#define RSB_FILL_LOOPS		16	/* To avoid underflow */

/*
 * Google experimented with loop-unrolling and this turned out to be
 * the optimal version — two calls, each with their own speculation
 * trap should their return address end up getting used, in a loop.
 */
#define __FILL_RETURN_BUFFER(reg, nr, sp)	\
	mov	$(nr/2), reg;			\
771:						\
	call	772f;				\
773:	/* speculation trap */			\
	pause;					\
	lfence;					\
	jmp	773b;				\
772:						\
	call	774f;				\
775:	/* speculation trap */			\
	pause;					\
	lfence;					\
	jmp	775b;				\
774:						\
	dec	reg;				\
	jnz	771b;				\
	add	$(BITS_PER_LONG/8) * nr, sp;

#ifdef __ASSEMBLY__

/*
 * This should be used immediately before a retpoline alternative.  It tells
 * objtool where the retpolines are so that it can make sense of the control
 * flow by just reading the original instruction(s) and ignoring the
 * alternatives.
 */
.macro ANNOTATE_NOSPEC_ALTERNATIVE
	.Lannotate_\@:
	.pushsection .discard.nospec
	.long .Lannotate_\@ - .
	.popsection
.endm

/*
 * This should be used immediately before an indirect jump/call. It tells
 * objtool the subsequent indirect jump/call is vouched safe for retpoline
 * builds.
 */
.macro ANNOTATE_RETPOLINE_SAFE
	.Lannotate_\@:
	.pushsection .discard.retpoline_safe
	_ASM_PTR .Lannotate_\@
	.popsection
.endm

/*
 * These are the bare retpoline primitives for indirect jmp and call.
 * Do not use these directly; they only exist to make the ALTERNATIVE
 * invocation below less ugly.
 */
.macro RETPOLINE_JMP reg:req
	call	.Ldo_rop_\@
.Lspec_trap_\@:
	pause
	lfence
	jmp	.Lspec_trap_\@
.Ldo_rop_\@:
	mov	\reg, (%_ASM_SP)
	ret
.endm

/*
 * This is a wrapper around RETPOLINE_JMP so the called function in reg
 * returns to the instruction after the macro.
 */
.macro RETPOLINE_CALL reg:req
	jmp	.Ldo_call_\@
.Ldo_retpoline_jmp_\@:
	RETPOLINE_JMP \reg
.Ldo_call_\@:
	call	.Ldo_retpoline_jmp_\@
.endm

/*
 * JMP_NOSPEC and CALL_NOSPEC macros can be used instead of a simple
 * indirect jmp/call which may be susceptible to the Spectre variant 2
 * attack.
 */
.macro JMP_NOSPEC reg:req
#ifdef CONFIG_RETPOLINE
	ANNOTATE_NOSPEC_ALTERNATIVE
	ALTERNATIVE_2 __stringify(ANNOTATE_RETPOLINE_SAFE; jmp *\reg),	\
		__stringify(RETPOLINE_JMP \reg), X86_FEATURE_RETPOLINE,	\
		__stringify(lfence; ANNOTATE_RETPOLINE_SAFE; jmp *\reg), X86_FEATURE_RETPOLINE_LFENCE
#else
	jmp	*\reg
#endif
.endm

.macro CALL_NOSPEC reg:req
#ifdef CONFIG_RETPOLINE
	ANNOTATE_NOSPEC_ALTERNATIVE
	ALTERNATIVE_2 __stringify(ANNOTATE_RETPOLINE_SAFE; call *\reg),	\
		__stringify(RETPOLINE_CALL \reg), X86_FEATURE_RETPOLINE,\
		__stringify(lfence; ANNOTATE_RETPOLINE_SAFE; call *\reg), X86_FEATURE_RETPOLINE_LFENCE
#else
	call	*\reg
#endif
.endm

/*
  * A simpler FILL_RETURN_BUFFER macro. Don't make people use the CPP
  * monstrosity above, manually.
  */
.macro FILL_RETURN_BUFFER reg:req nr:req ftr:req
#ifdef CONFIG_RETPOLINE
	ANNOTATE_NOSPEC_ALTERNATIVE
	ALTERNATIVE "jmp .Lskip_rsb_\@",				\
		__stringify(__FILL_RETURN_BUFFER(\reg,\nr,%_ASM_SP))	\
		\ftr
.Lskip_rsb_\@:
#endif
.endm

#else /* __ASSEMBLY__ */

#define ANNOTATE_NOSPEC_ALTERNATIVE				\
	"999:\n\t"						\
	".pushsection .discard.nospec\n\t"			\
	".long 999b - .\n\t"					\
	".popsection\n\t"

#define ANNOTATE_RETPOLINE_SAFE					\
	"999:\n\t"						\
	".pushsection .discard.retpoline_safe\n\t"		\
	_ASM_PTR " 999b\n\t"					\
	".popsection\n\t"

#ifdef CONFIG_RETPOLINE
#ifdef CONFIG_X86_64

/*
 * Inline asm uses the %V modifier which is only in newer GCC
 * which is ensured when CONFIG_RETPOLINE is defined.
 */
# define CALL_NOSPEC						\
	ANNOTATE_NOSPEC_ALTERNATIVE				\
	ALTERNATIVE_2(						\
	ANNOTATE_RETPOLINE_SAFE					\
	"call *%[thunk_target]\n",				\
	"call __x86_indirect_thunk_%V[thunk_target]\n",		\
	X86_FEATURE_RETPOLINE,					\
	"lfence;\n"						\
	ANNOTATE_RETPOLINE_SAFE					\
	"call *%[thunk_target]\n",				\
	X86_FEATURE_RETPOLINE_LFENCE)
# define THUNK_TARGET(addr) [thunk_target] "r" (addr)

#else /* CONFIG_X86_32 */
/*
 * For i386 we use the original ret-equivalent retpoline, because
 * otherwise we'll run out of registers. We don't care about CET
 * here, anyway.
 */
# define CALL_NOSPEC						\
	ANNOTATE_NOSPEC_ALTERNATIVE				\
	ALTERNATIVE_2(						\
	ANNOTATE_RETPOLINE_SAFE					\
	"call *%[thunk_target]\n",				\
	"       jmp    904f;\n"					\
	"       .align 16\n"					\
	"901:	call   903f;\n"					\
	"902:	pause;\n"					\
	"    	lfence;\n"					\
	"       jmp    902b;\n"					\
	"       .align 16\n"					\
	"903:	lea    4(%%esp), %%esp;\n"			\
	"       pushl  %[thunk_target];\n"			\
	"       ret;\n"						\
	"       .align 16\n"					\
	"904:	call   901b;\n",				\
	X86_FEATURE_RETPOLINE,					\
	"lfence;\n"						\
	ANNOTATE_RETPOLINE_SAFE					\
	"call *%[thunk_target]\n",				\
	X86_FEATURE_RETPOLINE_LFENCE)

# define THUNK_TARGET(addr) [thunk_target] "rm" (addr)
#endif
#else /* No retpoline for C / inline asm */
# define CALL_NOSPEC "call *%[thunk_target]\n"
# define THUNK_TARGET(addr) [thunk_target] "rm" (addr)
#endif

/* The Spectre V2 mitigation variants */
enum spectre_v2_mitigation {
	SPECTRE_V2_NONE,
	SPECTRE_V2_RETPOLINE,
	SPECTRE_V2_LFENCE,
	SPECTRE_V2_EIBRS,
	SPECTRE_V2_EIBRS_RETPOLINE,
	SPECTRE_V2_EIBRS_LFENCE,
};

/* The indirect branch speculation control variants */
enum spectre_v2_user_mitigation {
	SPECTRE_V2_USER_NONE,
	SPECTRE_V2_USER_STRICT,
	SPECTRE_V2_USER_STRICT_PREFERRED,
	SPECTRE_V2_USER_PRCTL,
	SPECTRE_V2_USER_SECCOMP,
};

/* The Speculative Store Bypass disable variants */
enum ssb_mitigation {
	SPEC_STORE_BYPASS_NONE,
	SPEC_STORE_BYPASS_DISABLE,
	SPEC_STORE_BYPASS_PRCTL,
	SPEC_STORE_BYPASS_SECCOMP,
};

extern char __indirect_thunk_start[];
extern char __indirect_thunk_end[];

/*
 * On VMEXIT we must ensure that no RSB predictions learned in the guest
 * can be followed in the host, by overwriting the RSB completely. Both
 * retpoline and IBRS mitigations for Spectre v2 need this; only on future
 * CPUs with IBRS_ALL *might* it be avoided.
 */
static inline void vmexit_fill_RSB(void)
{
#ifdef CONFIG_RETPOLINE
	unsigned long loops;

asm volatile (ANNOTATE_NOSPEC_ALTERNATIVE
		      ALTERNATIVE("jmp 910f",
				  __stringify(__FILL_RETURN_BUFFER(%0, RSB_CLEAR_LOOPS, %1)),
				  X86_FEATURE_RETPOLINE)
		      "910:"
		      : "=r" (loops), ASM_CALL_CONSTRAINT
		      : : "memory" );
#endif
}

static __always_inline
void alternative_msr_write(unsigned int msr, u64 val, unsigned int feature)
{
	asm volatile(ALTERNATIVE("", "wrmsr", %c[feature])
		: : "c" (msr),
		    "a" ((u32)val),
		    "d" ((u32)(val >> 32)),
		    [feature] "i" (feature)
		: "memory");
}

static inline void indirect_branch_prediction_barrier(void)
{
	u64 val = PRED_CMD_IBPB;

alternative_msr_write(MSR_IA32_PRED_CMD, val, X86_FEATURE_USE_IBPB);
}

/* The Intel SPEC CTRL MSR base value cache */
extern u64 x86_spec_ctrl_base;

/*
 * With retpoline, we must use IBRS to restrict branch prediction
 * before calling into firmware.
 *
 * (Implemented as CPP macros due to header hell.)
 */
#define firmware_restrict_branch_speculation_start()			\
do {									\
	u64 val = x86_spec_ctrl_base | SPEC_CTRL_IBRS;			\
									\
	preempt_disable();						\
	alternative_msr_write(MSR_IA32_SPEC_CTRL, val,			\
			      X86_FEATURE_USE_IBRS_FW);			\
} while (0)

#define firmware_restrict_branch_speculation_end()			\
do {									\
	u64 val = x86_spec_ctrl_base;					\
									\
	alternative_msr_write(MSR_IA32_SPEC_CTRL, val,			\
			      X86_FEATURE_USE_IBRS_FW);			\
	preempt_enable();						\
} while (0)

DECLARE_STATIC_KEY_FALSE(switch_to_cond_stibp);
DECLARE_STATIC_KEY_FALSE(switch_mm_cond_ibpb);
DECLARE_STATIC_KEY_FALSE(switch_mm_always_ibpb);

DECLARE_STATIC_KEY_FALSE(mds_user_clear);
DECLARE_STATIC_KEY_FALSE(mds_idle_clear);

DECLARE_STATIC_KEY_FALSE(mmio_stale_data_clear);

#include <asm/segment.h>

/**
 * mds_clear_cpu_buffers - Mitigation for MDS and TAA vulnerability
 *
 * This uses the otherwise unused and obsolete VERW instruction in
 * combination with microcode which triggers a CPU buffer flush when the
 * instruction is executed.
 */
static __always_inline void mds_clear_cpu_buffers(void)
{
	static const u16 ds = __KERNEL_DS;

/*
	 * Has to be the memory-operand variant because only that
	 * guarantees the CPU buffer flush functionality according to
	 * documentation. The register-operand variant does not.
	 * Works with any segment selector, but a valid writable
	 * data segment is the fastest variant.
	 *
	 * "cc" clobber is required because VERW modifies ZF.
	 */
	asm volatile("verw %[ds]" : : [ds] "m" (ds) : "cc");
}

/**
 * mds_user_clear_cpu_buffers - Mitigation for MDS and TAA vulnerability
 *
 * Clear CPU buffers if the corresponding static key is enabled
 */
static __always_inline void mds_user_clear_cpu_buffers(void)
{
	if (static_branch_likely(&mds_user_clear))
		mds_clear_cpu_buffers();
}

/**
 * mds_idle_clear_cpu_buffers - Mitigation for MDS vulnerability
 *
 * Clear CPU buffers if the corresponding static key is enabled
 */
static inline void mds_idle_clear_cpu_buffers(void)
{
	if (static_branch_likely(&mds_idle_clear))
		mds_clear_cpu_buffers();
}

#endif /* __ASSEMBLY__ */

/*
 * Below is used in the eBPF JIT compiler and emits the byte sequence
 * for the following assembly:
 *
 * With retpolines configured:
 *
 *    callq do_rop
 *  spec_trap:
 *    pause
 *    lfence
 *    jmp spec_trap
 *  do_rop:
 *    mov %rax,(%rsp)
 *    retq
 *
 * Without retpolines configured:
 *
 *    jmp *%rax
 */
#ifdef CONFIG_RETPOLINE
# define RETPOLINE_RAX_BPF_JIT_SIZE	17
# define RETPOLINE_RAX_BPF_JIT()				\
	EMIT1_off32(0xE8, 7);	 /* callq do_rop */		\
	/* spec_trap: */					\
	EMIT2(0xF3, 0x90);       /* pause */			\
	EMIT3(0x0F, 0xAE, 0xE8); /* lfence */			\
	EMIT2(0xEB, 0xF9);       /* jmp spec_trap */		\
	/* do_rop: */						\
	EMIT4(0x48, 0x89, 0x04, 0x24); /* mov %rax,(%rsp) */	\
	EMIT1(0xC3);             /* retq */
#else
# define RETPOLINE_RAX_BPF_JIT_SIZE	2
# define RETPOLINE_RAX_BPF_JIT()				\
	EMIT2(0xFF, 0xE0);	 /* jmp *%rax */
#endif

#endif /* _ASM_X86_NOSPEC_BRANCH_H_ */