leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
17eed27b02
linux/arch/arm64/include/asm
History
Dave Martin 17eed27b02 arm64/sve: KVM: Prevent guests from using SVE 
Until KVM has full SVE support, guests must not be allowed to
execute SVE instructions.

This patch enables the necessary traps, and also ensures that the
traps are disabled again on exit from the guest so that the host
can still use SVE if it wants to.

On guest exit, high bits of the SVE Zn registers may have been
clobbered as a side-effect the execution of FPSIMD instructions in
the guest.  The existing KVM host FPSIMD restore code is not
sufficient to restore these bits, so this patch explicitly marks
the CPU as not containing cached vector state for any task, thus
forcing a reload on the next return to userspace.  This is an
interim measure, in advance of adding full SVE awareness to KVM.

This marking of cached vector state in the CPU as invalid is done
using __this_cpu_write(fpsimd_last_state, NULL) in fpsimd.c.  Due
to the repeated use of this rather obscure operation, it makes
sense to factor it out as a separate helper with a clearer name.
This patch factors it out as fpsimd_flush_cpu_state(), and ports
all callers to use it.

As a side effect of this refactoring, a this_cpu_write() in
fpsimd_cpu_pm_notifier() is changed to __this_cpu_write().  This
should be fine, since cpu_pm_enter() is supposed to be called only
with interrupts disabled.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-11-03 15:24:19 +00:00
..
xen arm/arm64: xen: Move shared architecture headers to include/xen/arm 2016-12-02 11:49:55 -08:00
acenv.h
acpi.h ARM64/ACPI: Fix BAD_MADT_GICC_ENTRY() macro implementation 2017-06-02 15:13:52 +01:00
alternative.h arm64: Fix circular include of asm/lse.h through linux/jump_label.h 2016-11-05 20:59:06 +00:00
arch_gicv3.h irqchip/gic-v3-its: Add VPE interrupt masking 2017-08-31 15:31:38 +01:00
arch_timer.h arm_arch_timer: Expose event stream status 2017-10-13 18:55:05 +01:00
arm-cci.h
asm-bug.h arm64: asm-bug: Renumber macro local labels to avoid clashes 2017-10-25 15:57:15 +01:00
asm-offsets.h
asm-uaccess.h arm64: entry: improve data abort handling of tagged pointers 2017-05-09 17:26:59 +01:00
assembler.h arm64: entry.S: convert elX_irq 2017-11-02 15:55:41 +00:00
atomic_ll_sc.h arm64: Remove redundant mov from LL/SC cmpxchg 2017-05-15 18:30:10 +01:00
atomic_lse.h arm64: atomics: Remove '&' from '+&' asm constraint in lse atomics 2017-07-20 10:20:54 +01:00
atomic.h
barrier.h arm64: sysreg: Move SPE registers and PSB into common header files 2017-10-18 12:53:32 +01:00
bitops.h
bitrev.h
boot.h
brk-imm.h
bug.h arm64: Add ASM_BUG() 2017-08-08 16:28:13 +01:00
cache.h arm64: cache: Identify VPIPT I-caches 2017-03-20 16:17:02 +00:00
cacheflush.h arm64: Implement pmem API support 2017-08-09 12:15:45 +01:00
checksum.h arm64: add missing conversion to __wsum in ip_fast_csum() 2017-06-29 16:32:43 +01:00
clocksource.h arm/arm64: arch_timer: Use archdata to indicate vdso suitability 2016-09-23 17:19:25 +01:00
cmpxchg.h arm64: xchg: hazard against entire exchange variable 2017-05-09 17:44:50 +01:00
compat.h sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
compiler.h
cpu_ops.h
cpu.h arm64/sve: Probe SVE capabilities and usable vector lengths 2017-11-03 15:24:17 +00:00
cpucaps.h arm64: Implement pmem API support 2017-08-09 12:15:45 +01:00
cpufeature.h arm64/sve: Probe SVE capabilities and usable vector lengths 2017-11-03 15:24:17 +00:00
cpuidle.h
cputype.h arm64: Add MIDR values for Cavium cn83XX SoCs 2017-06-15 09:45:04 +01:00
current.h arm64: remove redundant header file in current.h 2017-03-30 19:15:37 +01:00
daifflags.h arm64: Move the async/fiq helpers to explicitly set process context flags 2017-11-02 15:55:41 +00:00
dcc.h arm64: dcc: simplify accessors 2016-09-09 11:41:13 +01:00
debug-monitors.h arm64: Add uprobe support 2016-11-07 18:15:21 +00:00
device.h xen/arm,arm64: fix xen_dma_ops after 815dd18 "Consolidate get_dma_ops..." 2017-05-02 11:14:42 +02:00
dma-mapping.h This is the first pull request for the new dma-mapping subsystem 2017-07-06 19:20:54 -07:00
dmi.h
efi.h Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-09-07 09:42:35 -07:00
elf.h arm64: elf.h: Correct comment about READ_IMPLIES_EXEC propagation 2017-10-09 10:00:23 +01:00
esr.h arm64/sve: System register and exception syndrome definitions 2017-11-03 15:24:13 +00:00
exception.h
exec.h arm64: suspend: Reconfigure PSTATE after resume from idle 2016-10-20 09:50:54 +01:00
extable.h arm64: add extable.h 2017-03-28 18:23:23 -04:00
fb.h
fixmap.h
fpsimd.h arm64/sve: KVM: Prevent guests from using SVE 2017-11-03 15:24:19 +00:00
fpsimdmacros.h arm64/sve: Low-level SVE architectural state manipulation functions 2017-11-03 15:24:14 +00:00
ftrace.h
futex.h futex: Remove duplicated code and fix undefined behaviour 2017-08-25 22:49:59 +02:00
hardirq.h arm64: kdump: implement machine_crash_shutdown() 2017-04-05 18:29:15 +01:00
hugetlb.h arm64: hugetlb: Override set_huge_swap_pte_at() to support contiguous hugepages 2017-08-22 17:47:11 +01:00
hw_breakpoint.h arm64: cpufeature: Make ID reg accessor naming less counterintuitive 2017-04-04 16:55:41 +01:00
hwcap.h
hypervisor.h
insn.h arm64: Prevent cpu hotplug rwsem recursion 2017-05-26 10:10:45 +02:00
io.h ARM64: Implement pci_remap_cfgspace() interface 2017-04-24 13:53:13 -05:00
irq_work.h
irq.h arm64: clean up irq stack definitions 2017-08-15 18:35:14 +01:00
irqflags.h arm64: Move the async/fiq helpers to explicitly set process context flags 2017-11-02 15:55:41 +00:00
jump_label.h
kasan.h
Kbuild arm64: neon: replace generic definition of may_use_simd() 2017-08-04 15:00:47 +01:00
kernel-pgtable.h arm64: Introduce uaccess_{disable,enable} functionality based on TTBR0_EL1 2016-11-21 18:48:53 +00:00
kexec.h arm64: kdump: implement machine_crash_shutdown() 2017-04-05 18:29:15 +01:00
kgdb.h
kprobes.h kprobes: move kprobe declarations to asm-generic/kprobes.h 2017-02-27 18:43:45 -08:00
kvm_arm.h arm64/sve: KVM: Prevent guests from using SVE 2017-11-03 15:24:19 +00:00
kvm_asm.h arm64: KVM: Convert __cpu_reset_hyp_mode to using __hyp_reset_vectors 2017-04-09 07:49:22 -07:00
kvm_coproc.h
kvm_emulate.h KVM: arm/arm64: Fix guest external abort matching 2017-09-05 17:33:37 +02:00
kvm_host.h arm64/sve: KVM: Prevent guests from using SVE 2017-11-03 15:24:19 +00:00
kvm_hyp.h KVM: arm64: vgic-v3: Add hook to handle guest GICv3 sysreg accesses at EL2 2017-06-15 09:44:59 +01:00
kvm_mmio.h
kvm_mmu.h kvm: arm64: Convert kvm_set_s2pte_readonly() from inline asm to cmpxchg() 2017-08-21 11:12:39 +01:00
kvm_psci.h
linkage.h arm64: relax assembly code alignment from 16 byte to 4 byte 2017-09-18 11:20:19 +01:00
lse.h arm64: do not trace atomic operations 2017-02-06 19:00:23 +00:00
memblock.h
memory.h arm64: move TASK_* definitions to <asm/processor.h> 2017-10-02 10:13:04 +01:00
mmu_context.h sched/headers: Prepare to remove the <linux/mm_types.h> dependency from <linux/sched.h> 2017-03-02 08:42:37 +01:00
mmu.h arm64: introduce separated bits for mm_context_t flags 2017-08-22 18:13:04 +01:00
mmzone.h
module.h arm64: ftrace: add support for far branches to dynamic ftrace 2017-06-07 11:52:02 +01:00
neon.h arm64: neon: Temporarily add a kernel_mode_begin_partial() definition 2017-08-04 15:10:12 +01:00
numa.h arm64: numa: Remove the unused parent_node() macro 2017-08-15 14:37:45 +01:00
page-def.h arm64: factor out PAGE_* and CONT_* definitions 2017-08-15 18:35:00 +01:00
page.h arm64: factor out PAGE_* and CONT_* definitions 2017-08-15 18:35:00 +01:00
paravirt.h
pci.h PCI: Add pci_mmap_resource_range() and use it for ARM64 2017-04-20 08:47:47 -05:00
percpu.h arm64: factor out current_stack_pointer 2016-11-11 18:25:43 +00:00
perf_event.h arm64 updates for 4.10: 2016-12-13 16:39:21 -08:00
pgalloc.h
pgtable-hwdef.h arm64: simplify sysreg manipulation 2016-09-09 11:43:50 +01:00
pgtable-prot.h arm64: Move PTE_RDONLY bit handling out of set_pte_at() 2017-08-21 11:12:50 +01:00
pgtable-types.h arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
pgtable.h arm64: Implement arch-specific pte_access_permitted() 2017-10-30 12:41:15 +00:00
probes.h arm64: Remove reference to asm/opcodes.h 2016-12-05 10:42:34 +00:00
proc-fns.h
processor.h arm64/sve: Add prctl controls for userspace vector length management 2017-11-03 15:24:19 +00:00
ptdump.h arm64: dump: Add checking for writable and exectuable pages 2016-11-07 18:15:04 +00:00
ptrace.h Merge branch 'arm64/exception-stack' of git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux into for-next/core 2017-08-09 15:37:49 +01:00
seccomp.h
sections.h arm64: mmu: apply strict permissions to .init.text and .init.data 2017-03-23 13:54:50 +00:00
shmparam.h
signal32.h arm64: compat: Remove leftover variable declaration 2017-08-10 18:17:32 +01:00
simd.h arm64: neon: Forbid when irqs are disabled 2017-08-09 15:05:59 +01:00
smp_plat.h
smp.h arm64: kexec: have own crash_smp_send_stop() for crash dump for nonpanic cores 2017-08-21 18:01:04 +01:00
sparsemem.h
spinlock_types.h
spinlock.h Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-09-04 11:52:29 -07:00
stack_pointer.h arm64: factor out current_stack_pointer 2016-11-11 18:25:43 +00:00
stackprotector.h arm64: ascii armor the arm64 boot init stack canary 2017-07-12 16:26:03 -07:00
stacktrace.h arm64: add VMAP_STACK overflow detection 2017-08-15 18:36:18 +01:00
stage2_pgtable-nopmd.h
stage2_pgtable-nopud.h
stage2_pgtable.h
stat.h
string.h arm64: uaccess: Implement *_flushcache variants 2017-08-09 12:16:26 +01:00
suspend.h arm64: move sp_el0 and tpidr_el1 into cpu_suspend_ctx 2016-11-11 18:25:44 +00:00
sync_bitops.h
syscall.h
sysreg.h arm64/sve: System register and exception syndrome definitions 2017-11-03 15:24:13 +00:00
system_misc.h Merge branch 'aarch64/for-next/ras-apei' into aarch64/for-next/core 2017-06-26 10:54:27 +01:00
thread_info.h arm64/sve: Support vector length resetting for new processes 2017-11-03 15:24:16 +00:00
timex.h
tlb.h
tlbflush.h arm64: Work around Falkor erratum 1009 2017-02-01 15:41:50 +00:00
topology.h
traps.h arm64/sve: Core task context handling 2017-11-03 15:24:15 +00:00
uaccess.h arm64 updates for 4.14: 2017-09-05 09:53:37 -07:00
unistd32.h Remove compat_sys_getdents64() 2017-04-17 12:52:22 -04:00
unistd.h Remove compat_sys_getdents64() 2017-04-17 12:52:22 -04:00
uprobes.h arm64: Add uprobe support 2016-11-07 18:15:21 +00:00
vdso_datapage.h
vdso.h
virt.h arm64: hyp-stub/KVM: Kill __hyp_get_vectors 2017-04-09 07:49:34 -07:00
word-at-a-time.h Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00