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4109ca066b
linux/arch/x86/include/asm
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Dave Hansen 4109ca066b x86/fpu: Remove XSTATE_RESERVE 
The original purpose of XSTATE_RESERVE was to carve out space
to store all of the possible extended state components that
get saved with the XSAVE instruction(s).

However, we are now almost entirely dynamically allocating
the buffers we use for XSAVE by placing them at the end of
the task_struct and them sizing them at boot.  The one
exception for that is the init_task.

The maximum extended state component size that we have today
is on systems with space for AVX-512 and Memory Protection
Keys: 2696 bytes.  We have reserved a PAGE_SIZE buffer in
the init_task via fpregs_state->__padding.

This check ensures that even if the component sizes or
layout were changed (which we do not expect), that we will
still not overflow the init_task's buffer.

In the case that we detect we might overflow the buffer,
we completely disable XSAVE support in the kernel and try
to boot as if we had 'legacy x87 FPU' support in place.
This is a crippled state without any of the XSAVE-enabled
features (MPX, AVX, etc...).  But, it at least let us
boot safely.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: dave@sr71.net
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/20150902233125.D948D475@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-09-14 12:07:56 +02:00
..
crypto x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
fpu x86/fpu: Remove XSTATE_RESERVE 2015-09-14 12:07:56 +02:00
numachip
trace Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
uv
xen xen: Use correctly the Xen memory terminologies 2015-09-08 18:03:49 +01:00
a.out-core.h
acenv.h
acpi.h
agp.h
alternative-asm.h x86/alternatives: Document macros 2015-05-06 11:25:31 +02:00
alternative.h x86/alternatives, x86/fpu: Add 'alternatives_patched' debug flag and use it in xsave_state() 2015-05-19 15:48:03 +02:00
amd_nb.h x86/gart: Check for GART support before accessing GART registers 2015-05-06 11:15:53 +02:00
apb_timer.h
apic_flat_64.h
apic.h x86/smpboot: Remove APIC.wait_for_init_deassert and atomic init_deasserted 2015-08-17 10:42:28 +02:00
apicdef.h
apm.h
arch_hweight.h x86/hweight: Force inlining of __arch_hweight{32,64}() 2015-08-05 09:38:09 +02:00
archrandom.h
asm-offsets.h
asm.h x86/asm/uaccess: Unify the ALIGN_DESTINATION macro 2015-05-14 07:25:34 +02:00
atomic64_32.h x86: Provide atomic_{or,xor,and} 2015-07-27 14:06:23 +02:00
atomic64_64.h x86: Provide atomic_{or,xor,and} 2015-07-27 14:06:23 +02:00
atomic.h atomic: Collapse all atomic_{set,clear}_mask definitions 2015-07-27 14:06:24 +02:00
barrier.h Merge branch 'x86/asm' into locking/core 2015-08-03 11:04:00 +02:00
bios_ebda.h
bitops.h
boot.h
bootparam_utils.h
bug.h
bugs.h
cache.h
cacheflush.h nd_blk: change aperture mapping from WC to WB 2015-08-27 19:38:28 -04:00
calgary.h
ce4100.h
checksum_32.h
checksum_64.h
checksum.h
clocksource.h
cmdline.h
cmpxchg_32.h
cmpxchg_64.h
cmpxchg.h arch: Remove __ARCH_HAVE_CMPXCHG 2015-05-13 10:55:42 +02:00
compat.h x86/asm/entry/64: Save user RSP in pt_regs->sp on SYSCALL64 fastpath 2015-03-10 13:56:10 +01:00
cpu_device_id.h
cpu.h x86: Use common outgoing-CPU-notification code 2015-03-11 13:22:35 -07:00
cpufeature.h Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-01 09:41:03 -07:00
cpumask.h
crash.h
current.h
debugreg.h
delay.h x86/asm/delay: Introduce an MWAITX-based delay with a configurable timer 2015-08-22 14:52:16 +02:00
desc_defs.h
desc.h x86/ldt: Make modify_ldt synchronous 2015-07-31 10:23:23 +02:00
device.h
disabled-features.h
div64.h
dma-mapping.h dma-mapping: consolidate dma_set_mask 2015-09-10 13:29:01 -07:00
dma.h
dmi.h
e820.h mm: move memtest under mm 2015-04-14 16:49:06 -07:00
edac.h EDAC: Cleanup atomic_scrub mess 2015-05-28 15:31:53 +02:00
efi.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
elf.h x86/compat: Don't build the 32-bit VDSO if not needed 2015-07-06 15:28:56 +02:00
emergency-restart.h
entry_arch.h Merge branch 'x86/ras' into x86/core, to fix conflicts 2015-06-07 15:35:27 +02:00
espfix.h x86/espfix: Add 'cpu' parameter to init_espfix_ap() 2015-07-06 15:00:33 +02:00
exec.h
fb.h
fixmap.h
floppy.h
frame.h x86/debug: Remove perpetually broken, unmaintainable dwarf annotations 2015-06-02 07:57:48 +02:00
ftrace.h ftrace: Format MCOUNT_ADDR address as type unsigned long 2015-07-20 22:30:53 -04:00
futex.h
gart.h
genapic.h
geode.h
gpio.h
hardirq.h Merge branch 'x86/ras' into x86/core, to fix conflicts 2015-06-07 15:35:27 +02:00
highmem.h
hpet.h x86/MSI: Clean up unused MSI related code and interfaces 2015-04-24 15:36:49 +02:00
hugetlb.h mm/hugetlb: remove arch_prepare/release_hugepage from arch headers 2015-06-25 17:00:35 -07:00
hw_breakpoint.h
hw_irq.h x86/irq: Store irq descriptor in vector array 2015-08-06 00:14:59 +02:00
hypertransport.h
hypervisor.h hypervisor/x86/xen: Unset X86_BUG_SYSRET_SS_ATTRS on Xen PV guests 2015-05-05 18:27:43 +01:00
i8259.h
ia32_unistd.h
ia32.h x86/compat: Move ucontext_x32 to sigframe.h 2015-07-06 15:28:55 +02:00
idle.h
imr.h
inat_types.h
inat.h
init.h
insn.h
inst.h
intel_mid_vrtc.h
intel_pmc_ipc.h intel_pmc_ipc: Update kerneldoc formatting 2015-07-09 11:23:15 -07:00
intel_scu_ipc.h
intel-mid.h x86, intel-mid: remove Intel MID specific serial support 2015-03-07 03:25:18 +01:00
io_apic.h x86: Cleanup irq_domain ops 2015-04-24 15:36:55 +02:00
io.h libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
iomap.h
iommu_table.h x86/iommu: Fix header comments regarding standard and _FINISH macros 2015-04-09 10:56:31 +02:00
iommu.h
iosf_mbi.h x86/platform/iosf_mbi: Source cleanup 2015-07-16 17:48:48 +02:00
ipi.h
irq_regs.h
irq_remapping.h iommu, x86: Provide irq_remapping_cap() interface 2015-06-12 11:33:52 +02:00
irq_vectors.h x86/vm86: Move the vm86 IRQ definitions to vm86.h 2015-07-31 13:31:10 +02:00
irq_work.h
irq.h x86/irq: Store irq descriptor in vector array 2015-08-06 00:14:59 +02:00
irqdomain.h x86/irq: Move irqdomain specific code into asm/irqdomain.h 2015-04-24 15:36:55 +02:00
irqflags.h x86/asm/entry: Drop now unused ENABLE_INTERRUPTS_SYSEXIT32 2015-04-03 10:34:19 +02:00
ist.h
jump_label.h jump_label/x86: Work around asm build bug on older/backported GCCs 2015-08-13 08:44:43 +02:00
kasan.h x86/kasan: Define KASAN_SHADOW_OFFSET per architecture 2015-08-22 14:54:55 +02:00
kbdleds.h
Kbuild mm: clean up per architecture MM hook header files 2015-07-17 16:39:53 -07:00
kdebug.h kexec: split kexec_load syscall from kexec core code 2015-09-10 13:29:01 -07:00
kexec-bzimage64.h
kexec.h
kgdb.h
kmap_types.h
kmemcheck.h
kprobes.h
kvm_emulate.h KVM: x86: stubs for SMM support 2015-06-04 16:01:45 +02:00
kvm_guest.h
kvm_host.h KVM: MMU: introduce the framework to check zero bits on sptes 2015-08-05 12:47:24 +02:00
kvm_para.h x86: Use bool function return values of true/false not 1/0 2015-03-31 18:05:09 +02:00
lguest_hcall.h
lguest.h lguest: suppress interrupts for single insn, not range. 2015-03-24 11:52:08 +10:30
linkage.h
livepatch.h livepatch: x86: make kASLR logic more accurate 2015-04-29 16:51:33 +02:00
local64.h
local.h
mach_timer.h
mach_traps.h
math_emu.h x86/vm86: Clean up vm86.h includes 2015-07-31 13:31:10 +02:00
mc146818rtc.h
mce.h x86/mce: Clear Local MCE opt-in before kexec 2015-08-13 10:12:52 +02:00
microcode_amd.h x86/microcode: Correct CPU family related variable types 2015-06-07 15:38:15 +02:00
microcode_intel.h x86/microcode/intel: Rename get_matching_sig() 2015-05-18 09:32:37 +02:00
microcode.h x86/microcode: Parse built-in microcode early 2015-05-06 11:24:53 +02:00
misc.h
mmconfig.h
mmu_context.h x86/ldt: Make modify_ldt() optional 2015-07-31 13:30:45 +02:00
mmu.h x86/ldt: Make modify_ldt() optional 2015-07-31 13:30:45 +02:00
mmx.h
mmzone_32.h
mmzone_64.h
mmzone.h
module.h
mpspec_def.h
mpspec.h
mpx.h x86/mpx: Support 32-bit binaries on 64-bit kernels 2015-06-09 12:24:34 +02:00
mshyperv.h mshyperv: fix recognition of Hyper-V guest crash MSR's 2015-08-04 22:30:44 -07:00
msi.h x86/MSI: Use hierarchical irqdomains to manage MSI interrupts 2015-04-24 15:36:49 +02:00
msidef.h
msr-index.h Power management and ACPI material for v4.3-rc1 2015-09-01 19:45:46 -07:00
msr.h x86/asm/msr: Make wrmsrl() a function 2015-08-23 13:25:38 +02:00
mtrr.h x86/mm/mtrr: Avoid #ifdeffery with phys_wc_to_mtrr_index() 2015-05-27 14:41:00 +02:00
mutex_32.h
mutex_64.h
mutex.h
mwait.h x86/asm: Add MONITORX/MWAITX instruction support 2015-08-22 14:52:16 +02:00
nmi.h
nops.h
numa_32.h
numa.h
olpc_ofw.h
olpc.h
page_32_types.h
page_32.h
page_64_types.h
page_64.h
page_types.h x86, mm: support huge I/O mapping capability I/F 2015-04-14 16:49:04 -07:00
page.h
paravirt_types.h x86/asm/tsc, x86/paravirt: Remove read_tsc() and read_tscp() paravirt hooks 2015-07-06 15:23:26 +02:00
paravirt.h x86/asm/msr: Make wrmsrl() a function 2015-08-23 13:25:38 +02:00
parport.h
pat.h x86/mm/pat: Emulate PAT when it is disabled 2015-06-07 15:28:52 +02:00
pci_64.h
pci_x86.h PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq() 2015-07-30 14:05:57 -05:00
pci-direct.h
pci-functions.h
pci.h Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block 2015-06-25 15:22:36 -07:00
percpu.h
perf_event_p4.h
perf_event.h x86: Add new MSRs and MSR bits used for Intel Skylake PMU support 2015-08-04 10:16:56 +02:00
pgalloc.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable_32_types.h
pgtable_32.h
pgtable_64_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable_64.h
pgtable_types.h x86/mm/pat: Add pgprot_writethrough() 2015-06-07 15:28:58 +02:00
pgtable-2level_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable-2level.h
pgtable-3level_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable-3level.h
pgtable.h mm: clarify that the function operates on hugepage pte 2015-06-24 17:49:44 -07:00
platform_sst_audio.h
pm-trace.h PM / sleep: add pm-trace support for suspending phase 2015-03-18 15:54:27 +01:00
pmc_atom.h x86/platform/intel/pmc_atom: Add Cherrytrail PMC interface 2015-07-06 18:39:38 +02:00
pmem.h x86, pmem: clarify that ARCH_HAS_PMEM_API implies PMEM mapped WB 2015-08-27 19:40:59 -04:00
posix_types.h
preempt.h sched/preempt: Fix cond_resched_lock() and cond_resched_softirq() 2015-08-03 12:21:24 +02:00
probe_roms.h
processor-cyrix.h
processor-flags.h
processor.h Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-01 09:04:31 -07:00
prom.h
proto.h x86/asm/entry: Untangle 'system_call' into two entry points: entry_SYSCALL_64 and entry_INT80_32 2015-06-08 09:14:21 +02:00
ptrace.h x86/entry: Remove do_notify_resume(), syscall_trace_leave(), and their TIF masks 2015-08-05 10:54:35 +02:00
pvclock-abi.h x86: kvmclock: add flag to indicate pvclock counts from zero 2015-05-29 14:01:39 +02:00
pvclock.h x86/asm/tsc, x86/kvm: Drop open-coded barrier and use rdtsc_ordered() in kvmclock 2015-07-06 15:23:30 +02:00
qrwlock.h locking/qrwlock: Implement queue_write_unlock() using smp_store_release() 2015-08-12 11:59:05 +02:00
qspinlock_paravirt.h locking/pvqspinlock, x86: Implement the paravirt qspinlock call patching 2015-05-08 12:37:09 +02:00
qspinlock.h locking/pvqspinlock, x86: Implement the paravirt qspinlock call patching 2015-05-08 12:37:09 +02:00
realmode.h
reboot_fixups.h
reboot.h
required-features.h
rio.h
rmwcc.h
rtc.h
rwsem.h
seccomp.h x86: switch to using asm-generic for seccomp.h 2015-04-17 09:04:10 -04:00
sections.h
segment.h x86/asm/irq: Stop relying on magic JMP behavior for early_idt_handlers 2015-06-02 09:39:40 +02:00
serial.h serial: 8250: remove Kconfig indirection 2015-05-06 22:27:00 +02:00
setup_arch.h
setup.h x86: kaslr: fix build due to missing ALIGN definition 2015-04-29 21:54:54 +02:00
shmparam.h
sigcontext.h Revert x86 sigcontext cleanups 2015-08-13 12:42:22 -07:00
sigframe.h x86/compat: Move ucontext_x32 to sigframe.h 2015-07-06 15:28:55 +02:00
sighandling.h x86/signal: Remove pax argument from restore_sigcontext 2015-04-06 09:06:39 +02:00
signal.h x86/entry: Remove do_notify_resume(), syscall_trace_leave(), and their TIF masks 2015-08-05 10:54:35 +02:00
simd.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
smap.h
smp.h x86: Remove cpu_sibling_mask() and cpu_core_mask() 2015-05-27 15:22:17 +02:00
sparsemem.h
special_insns.h x86/mm: Add kerneldoc comments for pcommit_sfence() 2015-05-11 10:38:44 +02:00
spinlock_types.h locking/pvqspinlock: Rename QUEUED_SPINLOCK to QUEUED_SPINLOCKS 2015-05-11 09:52:09 +02:00
spinlock.h locking/pvqspinlock: Rename QUEUED_SPINLOCK to QUEUED_SPINLOCKS 2015-05-11 09:52:09 +02:00
sta2x11.h
stackprotector.h x86/asm/tsc: Rename native_read_tsc() to rdtsc() 2015-07-06 15:23:28 +02:00
stacktrace.h
string_32.h
string_64.h
string.h
suspend_32.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
suspend_64.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
suspend.h
svm.h
swiotlb.h
switch_to.h Revert "sched/x86_64: Don't save flags on context switch" 2015-08-18 09:39:26 +02:00
sync_bitops.h
sys_ia32.h
syscall.h
syscalls.h x86/vm86: Clean up vm86.h includes 2015-07-31 13:31:10 +02:00
sysfb.h
tce.h
thread_info.h x86/entry: Remove do_notify_resume(), syscall_trace_leave(), and their TIF masks 2015-08-05 10:54:35 +02:00
time.h
timer.h
timex.h
tlb.h
tlbflush.h mm: send one IPI per CPU to TLB flush all entries after unmapping pages 2015-09-04 16:54:41 -07:00
topology.h Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
trace_clock.h
traps.h x86/entry: Remove exception_enter() from most trap handlers 2015-07-07 10:59:09 +02:00
tsc.h Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-01 08:40:25 -07:00
uaccess_32.h Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
uaccess_64.h x86: clean up/fix 'copy_in_user()' tail zeroing 2015-04-08 14:28:45 -07:00
uaccess.h mm/uaccess, mm/fault: Clarify that uaccess may only sleep if pagefaults are enabled 2015-05-19 08:39:14 +02:00
unaligned.h
unistd.h
uprobes.h
user32.h
user_32.h
user_64.h
user.h x86/fpu: Rename xsave.header::xstate_bv to 'xfeatures' 2015-05-19 15:47:35 +02:00
vdso.h
vga.h
vgtod.h
virtext.h
vm86.h x86/vm86: Rename vm86->v86flags and v86mask 2015-07-31 13:31:11 +02:00
vmx.h x86/kvm: Rename VMX's segment access rights defines 2015-08-15 00:47:13 +02:00
vsyscall.h
vvar.h
word-at-a-time.h
x2apic.h
x86_init.h x86: Remove more unmodified io_apic_ops 2015-04-24 15:36:54 +02:00
xor_32.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
xor_64.h
xor_avx.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00
xor.h x86/fpu: Rename i387.h to fpu/api.h 2015-05-19 15:47:30 +02:00