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linux/arch/x86/kernel
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Thomas Gleixner 04dcbdb805 x86/speculation/mds: Clear CPU buffers on exit to user 
Add a static key which controls the invocation of the CPU buffer clear
mechanism on exit to user space and add the call into
prepare_exit_to_usermode() and do_nmi() right before actually returning.

Add documentation which kernel to user space transition this covers and
explain why some corner cases are not mitigated.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Jon Masters <jcm@redhat.com>
Tested-by: Jon Masters <jcm@redhat.com>
2019-03-06 21:52:13 +01:00
..
acpi
x86: Fix various typos in comments
2018-12-03 10:49:13 +01:00
apic
x86/kernel: Fix more -Wmissing-prototypes warnings
2018-12-08 12:24:35 +01:00
cpu
x86/speculation/mds: Clear CPU buffers on exit to user
2019-03-06 21:52:13 +01:00
fpu
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
kprobes
Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-12-26 17:03:51 -08:00
.gitignore
…
alternative.c
Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 17:54:58 +01:00
amd_gart_64.c
x86/amd_gart: fix unmapping of non-GART mappings
2019-01-05 08:27:32 +01:00
amd_nb.c
x86/amd_nb: Add PCI device IDs for family 17h, model 30h
2018-11-07 21:36:09 +01:00
apb_timer.c
…
aperture_64.c
x86/gart: Rewrite early_gart_iommu_check() comment
2018-11-05 21:18:31 +01:00
apm_32.c
x86/APM: Fix build warning when PROC_FS is not enabled
2018-09-15 10:16:25 +02:00
asm-offsets_32.c
x86/entry/32: Load task stack from x86_tss.sp1 in SYSENTER handler
2018-07-20 01:11:36 +02:00
asm-offsets_64.c
x86/paravirt: Move the pv_irq_ops under the PARAVIRT_XXL umbrella
2018-09-03 16:50:36 +02:00
asm-offsets.c
x86/kernel: Fix more -Wmissing-prototypes warnings
2018-12-08 12:24:35 +01:00
audit_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bootflag.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
check.c
x86/headers: Fix -Wmissing-prototypes warning
2018-11-23 07:59:59 +01:00
cpuid.c
x86/cpuid: Allow cpuid_read() to schedule
2018-03-27 12:01:48 +02:00
crash_dump_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
crash_dump_64.c
x86: Fix various typos in comments
2018-12-03 10:49:13 +01:00
crash.c
x86/kexec: Fix a kexec_file_load() failure
2019-01-15 12:12:50 +01:00
devicetree.c
x86/headers: Fix -Wmissing-prototypes warning
2018-11-23 07:59:59 +01:00
doublefault.c
x86/entry: Fix assumptions that the HW TSS is at the beginning of cpu_tss
2017-12-17 13:59:55 +01:00
dumpstack_32.c
x86/dumpstack: Unify show_regs()
2018-03-08 12:04:59 +01:00
dumpstack_64.c
x86/dumpstack: Unify show_regs()
2018-03-08 12:04:59 +01:00
dumpstack.c
x86/process: Don't mix user/kernel regs in 64bit __show_regs()
2018-09-06 14:33:12 +02:00
e820.c
memblock: stop using implicit alignment to SMP_CACHE_BYTES
2018-10-31 08:54:16 -07:00
early_printk.c
x86/earlyprintk: Add a force option for pciserial device
2018-10-02 21:02:47 +02:00
early-quirks.c
On GEM side:
2018-07-20 12:29:24 +10:00
ebda.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
eisa.c
x86/EISA: Don't probe EISA bus for Xen PV guests
2018-09-11 23:36:50 +02:00
espfix_64.c
x86/espfix: Document use of _PAGE_GLOBAL
2018-04-09 18:27:33 +02:00
ftrace_32.S
x86/retpoline/ftrace: Convert ftrace assembler indirect jumps
2018-01-12 00:14:30 +01:00
ftrace_64.S
x86/ftrace: Do not call function graph from dynamic trampolines
2018-12-19 22:43:37 -05:00
ftrace.c
x86/ftrace: Do not call function graph from dynamic trampolines
2018-12-19 22:43:37 -05:00
head32.c
x86/boot: Mostly revert commit ae7e1238e68f2a ("Add ACPI RSDP address to setup_header")
2018-11-20 09:43:10 +01:00
head64.c
x86/boot: Mostly revert commit ae7e1238e68f2a ("Add ACPI RSDP address to setup_header")
2018-11-20 09:43:10 +01:00
head_32.S
x86/pgtable/32: Allocate 8k page-tables when PTI is enabled
2018-07-20 01:11:41 +02:00
head_64.S
xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN_PVH
2018-12-13 13:41:49 -05:00
hpet.c
x86/hpet: Remove unused FSEC_PER_NSEC define
2018-12-04 12:17:21 +01:00
hw_breakpoint.c
perf/arch/x86: Implement hw_breakpoint_arch_parse()
2018-06-26 09:07:55 +02:00
i8237.c
x86/i8237: Register device based on FADT legacy boot flag
2018-04-27 16:44:29 +02:00
i8253.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
i8259.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
idt.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
ima_arch.c
x86/ima: retry detecting secure boot mode
2018-12-11 07:19:45 -05:00
io_delay.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ioport.c
x86/ioport: add ksys_ioperm() helper; remove in-kernel calls to sys_ioperm()
2018-04-02 20:16:12 +02:00
irq_32.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
irq_64.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
irq_work.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
irqflags.S
x86/paravirt: Make native_save_fl() extern inline
2018-07-03 10:56:27 +02:00
irqinit.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
itmt.c
x86/headers: Remove duplicate #includes
2017-12-12 11:32:24 +01:00
jailhouse.c
x86/headers: Fix -Wmissing-prototypes warning
2018-11-23 07:59:59 +01:00
jump_label.c
jump_label: move 'asm goto' support test to Kconfig
2019-01-06 09:46:51 +09:00
kdebugfs.c
…
kexec-bzimage64.c
x86/kexec: Don't setup EFI info if EFI runtime is not enabled
2019-02-01 18:18:54 +01:00
kgdb.c
kgdb/treewide: constify struct kgdb_arch arch_kgdb_ops
2018-12-30 08:33:06 +00:00
ksysfs.c
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
kvm.c
KVM: x86: WARN_ONCE if sending a PV IPI returns a fatal error
2019-01-25 19:11:33 +01:00
kvmclock.c
x86/kvmclock: convert to SPDX identifiers
2018-12-21 11:28:25 +01:00
ldt.c
x86/ldt: Remove unused variable in map_ldt_struct()
2018-11-06 21:35:11 +01:00
livepatch.c
…
machine_kexec_32.c
x86/kexec: Allocate 8k PGDs for PTI
2018-07-30 13:53:48 +02:00
machine_kexec_64.c
x86/mm: Stop pretending pgtable_l5_enabled is a variable
2018-05-19 11:56:57 +02:00
Makefile
jump_label: move 'asm goto' support test to Kconfig
2019-01-06 09:46:51 +09:00
mmconf-fam10h_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
module.c
x86: Add support for 64-bit place relative relocations
2018-09-27 17:56:47 +02:00
mpparse.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
msr.c
x86: Clean up 'sizeof x' => 'sizeof(x)'
2018-10-29 07:13:28 +01:00
nmi_selftest.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nmi.c
x86/speculation/mds: Clear CPU buffers on exit to user
2019-03-06 21:52:13 +01:00
paravirt_patch_32.c
x86/paravirt: Remove unused _paravirt_ident_32
2018-10-30 09:55:31 +01:00
paravirt_patch_64.c
x86/paravirt: Remove unused _paravirt_ident_32
2018-10-30 09:55:31 +01:00
paravirt-spinlocks.c
x86/paravirt: Use a single ops structure
2018-09-03 16:50:35 +02:00
paravirt.c
x86/paravirt: Remove unused _paravirt_ident_32
2018-10-30 09:55:31 +01:00
pci-calgary_64.c
x86/calgary: remove the mapping_error dma_map_ops method
2018-12-06 06:56:46 -08:00
pci-dma.c
dma-mapping: bypass indirect calls for dma-direct
2018-12-13 21:06:18 +01:00
pci-iommu_table.c
x86/iommu: Use NULL instead of 0
2018-08-02 14:33:19 +02:00
pci-swiotlb.c
dma-direct: merge swiotlb_dma_ops into the dma_direct code
2018-12-13 21:06:17 +01:00
pcspeaker.c
x86/platform/pcspeaker: Use PTR_ERR_OR_ZERO() to fix ptr_ret.cocci warning
2018-07-24 09:46:42 +02:00
perf_regs.c
perf/x86: Store user space frame-pointer value on a sample
2018-05-25 08:11:12 +02:00
platform-quirks.c
x86/i8237: Register device based on FADT legacy boot flag
2018-04-27 16:44:29 +02:00
pmem.c
resource: Provide resource struct in resource walk callback
2017-11-07 15:35:57 +01:00
probe_roms.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
process_32.c
Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-12-26 17:37:51 -08:00
process_64.c
Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-12-26 18:08:18 -08:00
process.c
Linux 4.20-rc5
2018-12-03 10:47:53 +01:00
process.h
x86/speculation: Change misspelled STIPB to STIBP
2018-12-06 11:49:15 +01:00
ptrace.c
x86/fsgsbase/64: Fix the base write helper functions
2018-12-18 14:26:09 +01:00
pvclock.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
quirks.c
x86/headers: Fix -Wmissing-prototypes warning
2018-11-23 07:59:59 +01:00
reboot_fixups_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
reboot.c
x86/apic: Fix restoring boot IRQ mode in reboot and kexec/kdump
2018-02-17 11:47:45 +01:00
relocate_kernel_32.S
…
relocate_kernel_64.S
x86/kexec: Make kexec (mostly) work in 5-level paging mode
2018-01-31 08:39:40 +01:00
resource.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rtc.c
x86: Convert x86_platform_ops to timespec64
2018-05-19 14:03:14 +02:00
setup_percpu.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
setup.c
Merge branch 'mount.part1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-01-05 13:25:58 -08:00
signal_compat.c
signal: Add TRAP_UNK si_code for undiagnosted trap exceptions
2018-04-25 10:40:56 -05:00
signal.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
smp.c
x86/irq: Let interrupt handlers set kvm_cpu_l1tf_flush_l1d
2018-08-05 09:53:13 +02:00
smpboot.c
x86/topology: Use total_cpus for max logical packages calculation
2018-12-18 13:38:37 +01:00
stacktrace.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
step.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sys_x86_64.c
x86/compat: Adjust in_compat_syscall() to generic code under !COMPAT
2018-11-01 12:59:25 +01:00
sysfb_efi.c
x86/kernel: Fix more -Wmissing-prototypes warnings
2018-12-08 12:24:35 +01:00
sysfb_simplefb.c
…
sysfb.c
…
tboot.c
iommu/vtd: Cleanup dma_remapping.h header
2018-11-12 14:22:56 +01:00
tce_64.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
time.c
Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 19:07:25 +01:00
tls.c
x86/ldt: Make the LDT mapping RO
2017-12-23 21:13:01 +01:00
tls.h
…
topology.c
x86/xen: Disable CPU0 hotplug for Xen PV
2018-09-12 21:15:02 +02:00
trace_clock.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tracepoint.c
x86/kernel: Fix more -Wmissing-prototypes warnings
2018-12-08 12:24:35 +01:00
traps.c
x86/speculation/mds: Clear CPU buffers on exit to user
2019-03-06 21:52:13 +01:00
tsc_msr.c
x86/cpu: Sanitize FAM6_ATOM naming
2018-10-02 10:14:32 +02:00
tsc_sync.c
Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 19:07:38 -08:00
tsc.c
x86/tsc: Make calibration refinement more robust
2018-11-06 21:53:15 +01:00
umip.c
signal/x86: Use force_sig_fault where appropriate
2018-09-21 15:30:54 +02:00
unwind_frame.c
x86/unwind: Disable unwinder warnings on 32-bit
2017-10-10 12:49:49 +02:00
unwind_guess.c
…
unwind_orc.c
x86/unwind/orc: Detect the end of the stack
2018-06-21 16:34:56 +02:00
uprobes.c
signal: Properly deliver SIGSEGV from x86 uprobes
2018-09-11 21:18:53 +02:00
verify_cpu.S
x86/boot: Annotate verify_cpu() as a callable function
2017-09-28 09:39:03 +02:00
vm86_32.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
vmlinux.lds.S
Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 18:43:04 +01:00
vsmp_64.c
x86/vsmp: Remove dependency on pv_irq_ops
2018-11-06 21:35:11 +01:00
x86_init.c
x86/acpi, x86/boot: Take RSDP address for boot params if available
2018-10-10 10:44:22 +02:00