Dave Martin cb968afc78 arm64/sve: Avoid dereference of dead task_struct in KVM guest entry ... When deciding whether to invalidate FPSIMD state cached in the cpu, the backend function sve_flush_cpu_state() attempts to dereference __this_cpu_read(fpsimd_last_state). However, this is not safe: there is no guarantee that this task_struct pointer is still valid, because the task could have exited in the meantime. This means that we need another means to get the appropriate value of TIF_SVE for the associated task. This patch solves this issue by adding a cached copy of the TIF_SVE flag in fpsimd_last_state, which we can check without dereferencing the task pointer. In particular, although this patch is not a KVM fix per se, this means that this check is now done safely in the KVM world switch path (which is currently the only user of this code). Signed-off-by: Dave Martin <Dave.Martin@arm.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Christoffer Dall <christoffer.dall@linaro.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>		2017-12-06 19:08:05 +00:00
..
probes	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
vdso	arm64 updates for 4.15	2017-11-15 10:56:56 -08:00
.gitignore	arm64: Build infrastructure	2012-09-17 13:42:21 +01:00
Makefile	arm64: ftrace: emit ftrace-mod.o contents through code	2017-12-01 13:04:59 +00:00
acpi.c	ACPI / boot: Correct address space of __acpi_map_table()	2017-07-24 22:47:56 +02:00
acpi_numa.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
acpi_parking_protocol.c	arm64: fix endianness annotation in acpi_parking_protocol.c	2017-06-29 11:33:15 +01:00
alternative.c	arm64: fix endianness annotation for __apply_alternatives()/get_alt_insn()	2017-06-29 16:32:43 +01:00
arm64ksyms.c	arm64: switch to RAW_COPY_USER	2017-03-28 18:23:24 -04:00
armv8_deprecated.c	arm64 updates for 4.15	2017-11-15 10:56:56 -08:00
asm-offsets.c	arm64: unwind: reference pt_regs via embedded stack frame	2017-08-09 14:07:13 +01:00
cacheinfo.c	arm64: cacheinfo: Remove CCSIDR-based cache information probing	2017-03-20 16:16:54 +00:00
cpu-reset.S	arm64: Add back cpu reset routines	2016-06-27 16:31:25 +01:00
cpu-reset.h	arm64: Use __pa_symbol for kernel symbols	2017-01-12 15:05:39 +00:00
cpu_errata.c	arm64: Add workaround for Cavium Thunder erratum 30115	2017-06-15 09:45:04 +01:00
cpu_ops.c	arm64: cpu_ops: Add missing 'const' qualifiers	2017-12-01 13:05:08 +00:00
cpufeature.c	arm64 updates for 4.15	2017-11-15 10:56:56 -08:00
cpuidle.c	arm64: kernel: Update kerneldoc for cpu_suspend() rename	2017-03-10 18:06:24 +00:00
cpuinfo.c	arm64/sve: Detect SVE and activate runtime support	2017-11-03 15:24:21 +00:00
crash_dump.c	arm64: kdump: provide /proc/vmcore file	2017-04-05 18:31:38 +01:00
debug-monitors.c	arm64: introduce an order for exceptions	2017-11-02 15:55:41 +00:00
efi-entry.S	arm64: efi-entry.S: avoid open-coded adr_l	2017-01-17 17:41:14 +00:00
efi-header.S	arm64: efi: split Image code and data into separate PE/COFF sections	2017-04-04 17:50:59 +01:00
efi.c	efi/arm: Enable DMI/SMBIOS	2017-06-05 17:50:44 +02:00
entry-fpsimd.S	arm64/sve: Low-level SVE architectural state manipulation functions	2017-11-03 15:24:14 +00:00
entry-ftrace.S	arm64: Fix static use of function graph	2017-11-03 12:05:23 +00:00
entry.S	arm64/sve: Detect SVE and activate runtime support	2017-11-03 15:24:21 +00:00
entry32.S	arm64: entry32: remove pointless register assignment	2015-07-10 16:47:13 +01:00
fpsimd.c	arm64/sve: Avoid dereference of dead task_struct in KVM guest entry	2017-12-06 19:08:05 +00:00
ftrace.c	arm64: ftrace: emit ftrace-mod.o contents through code	2017-12-01 13:04:59 +00:00
head.S	arm64/sve: Low-level CPU setup	2017-11-03 15:24:15 +00:00
hibernate-asm.S	arm64: Introduce raw_{d,i}cache_line_size	2016-09-09 15:03:29 +01:00
hibernate.c	arm64: explicitly mask all exceptions	2017-11-02 15:55:40 +00:00
hw_breakpoint.c	arm64: hw_breakpoint: fix watchpoint matching for tagged pointers	2017-05-09 17:26:40 +01:00
hyp-stub.S	arm64: hyp-stub: Zero x0 on successful stub handling	2017-04-09 07:49:35 -07:00
image.h	arm64 updates for 4.7:	2016-05-16 17:17:24 -07:00
insn.c	arm64 updates for 4.13:	2017-07-05 17:09:27 -07:00
io.c	arm64: Avoid aligning normal memory pointers in __memcpy_{to,from}io	2017-10-24 16:23:07 +01:00
irq.c	arm64: add basic VMAP_STACK support	2017-08-15 18:36:04 +01:00
jump_label.c	jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP}	2015-08-03 11:34:12 +02:00
kaslr.c	arm64: kaslr: Adjust the offset to avoid Image across alignment boundary	2017-08-22 18:15:42 +01:00
kgdb.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
kuser32.S	arm64: Add __NR_* definitions for compat syscalls	2014-07-10 11:02:40 +01:00
machine_kexec.c	arm64: explicitly mask all exceptions	2017-11-02 15:55:40 +00:00
module-plts.c	arm64: ftrace: emit ftrace-mod.o contents through code	2017-12-01 13:04:59 +00:00
module.c	arm64: fix endianness annotation for reloc_insn_movw() & reloc_insn_imm()	2017-06-29 11:09:39 +01:00
module.lds	arm64: ftrace: emit ftrace-mod.o contents through code	2017-12-01 13:04:59 +00:00
paravirt.c	arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops	2015-12-21 14:40:54 +00:00
pci.c	PCI: Add a generic weak pcibios_align_resource()	2017-08-02 14:53:16 -05:00
perf_callchain.c	arm64: unwind: remove sp from struct stackframe	2017-08-09 14:10:29 +01:00
perf_event.c	arm64: perf: remove unsupported events for Cortex-A73	2017-12-01 13:05:08 +00:00
perf_regs.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
process.c	arm64: fpsimd: Prevent registers leaking from dead tasks	2017-12-06 18:02:21 +00:00
psci.c	arm64: Use __pa_symbol for kernel symbols	2017-01-12 15:05:39 +00:00
ptrace.c	arm64/sve: ptrace and ELF coredump support	2017-11-03 15:24:18 +00:00
reloc_test_core.c	arm64: relocation testing module	2017-04-04 17:03:32 +01:00
reloc_test_syms.S	arm64: relocation testing module	2017-04-04 17:03:32 +01:00
relocate_kernel.S	arm64: Introduce raw_{d,i}cache_line_size	2016-09-09 15:03:29 +01:00
return_address.c	arm64: unwind: remove sp from struct stackframe	2017-08-09 14:10:29 +01:00
setup.c	arm64: Move the async/fiq helpers to explicitly set process context flags	2017-11-02 15:55:41 +00:00
signal.c	arm64/sve: Signal handling support	2017-11-03 15:24:16 +00:00
signal32.c	arm64/sve: Signal handling support	2017-11-03 15:24:16 +00:00
sleep.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
smccc-call.S	firmware: qcom: scm: Fix interrupted SCM calls	2017-02-03 18:46:33 +00:00
smp.c	arm64: Move the async/fiq helpers to explicitly set process context flags	2017-11-02 15:55:41 +00:00
smp_spin_table.c	arm64: Use __pa_symbol for kernel symbols	2017-01-12 15:05:39 +00:00
stacktrace.c	arm64: stacktrace: avoid listing stacktrace functions in stacktrace	2017-09-13 18:53:16 -07:00
suspend.c	arm64 updates for 4.15	2017-11-15 10:56:56 -08:00
sys.c	arm64: compat: Check for AArch32 state	2016-04-20 12:22:42 +01:00
sys32.c	arm64: fix implementation of mmap2 compat syscall	2015-03-19 10:43:51 +00:00
sys_compat.c	sched/headers: Prepare for the reduction of <linux/sched.h>'s signal API dependency	2017-03-02 08:42:37 +01:00
time.c	arm64: unwind: remove sp from struct stackframe	2017-08-09 14:10:29 +01:00
topology.c	arm64: Convert to using %pOF instead of full_name	2017-07-20 10:28:41 +01:00
trace-events-emulation.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
traps.c	arm64 updates for 4.15	2017-11-15 10:56:56 -08:00
vdso.c	arm64/vdso: Support mremap() for vDSO	2017-08-09 12:16:28 +01:00
vmlinux.lds.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00