Fenghua Yu dc7507ddce x86/fpu: Clear PASID when copying fpstate ... The kernel must allocate a Process Address Space ID (PASID) on behalf of each process which will use ENQCMD and program it into the new MSR to communicate the process identity to platform hardware. ENQCMD uses the PASID stored in this MSR to tag requests from this process. The PASID state must be cleared on fork() since fork creates a new address space. For clone(), it would be functionally OK to copy the PASID. However, clearing it is _also_ functionally OK since any PASID use will trigger the #GP handler to populate the MSR. Copying the PASID state has two main downsides: * It requires differentiating fork() and clone() in the code, both in the FPU code and keeping tsk->pasid_activated consistent. * It guarantees that the PASID is out of its init state, which incurs small but non-zero cost on every XSAVE/XRSTOR. The main downside of clearing the PASID at fpstate copy is the future, one-time #GP for the thread. Use the simplest approach: clear the PASID state both on clone() and fork(). Rely on the #GP handler for MSR population in children. Also, just clear the PASID bit from xfeatures if XSAVE is supported. This will have no effect on systems that do not have PASID support. It is virtually zero overhead because 'dst_fpu' was just written and the whole thing is cache hot. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20220207230254.3342514-7-fenghua.yu@intel.com		2022-02-15 11:31:43 +01:00
..
acpi	- Get rid of all the .fixup sections because this generates	2022-01-12 16:31:19 -08:00
apic	bitmap patches for 5.17-rc1	2022-01-23 06:20:44 +02:00
cpu	x86/sgx: Silence softlockup detection when releasing large enclaves	2022-02-10 15:58:14 -08:00
fpu	x86/fpu: Clear PASID when copying fpstate	2022-02-15 11:31:43 +01:00
kprobes	x86: Prepare inline-asm for straight-line-speculation	2021-12-08 19:23:12 +01:00
.gitignore
alternative.c	x86/alternative: Relax text_poke_bp() constraint	2021-12-09 11:04:50 +01:00
amd_gart_64.c	x86/amd_gart: don't set failed sg dma_address to DMA_MAPPING_ERROR	2021-08-09 17:13:06 +02:00
amd_nb.c	hwmon updates for v5.17	2022-01-11 10:25:36 -08:00
aperture_64.c	proc/vmcore: convert oldmem_pfn_is_ram callback to more generic vmcore callbacks	2021-11-09 10:02:48 -08:00
apm_32.c	x86: Fix various typos in comments, take #2	2021-03-21 23:50:28 +01:00
asm-offsets.c	um, x86: bury crypto_tfm_ctx_offset	2021-12-21 21:31:35 +01:00
asm-offsets_32.c	x86/stackprotector/32: Make the canary into a regular percpu variable	2021-03-08 13:19:05 +01:00
asm-offsets_64.c	x86/xen: Drop USERGS_SYSRET64 paravirt call	2021-02-10 12:32:07 +01:00
audit_64.c	audit: add support for the openat2 syscall	2021-10-01 16:52:48 -04:00
bootflag.c
cc_platform.c	hyperv-next for 5.17	2022-01-16 15:53:00 +02:00
check.c
cpuid.c	smp: Cleanup smp_call_function*()	2020-11-24 16:47:49 +01:00
crash.c	x86/crash: Remove crash_reserve_low_1M()	2021-06-07 12:14:45 +02:00
crash_core_32.c
crash_core_64.c
crash_dump_32.c	x86/crashdump/32: Simplify copy_oldmem_page()	2020-11-24 14:42:09 +01:00
crash_dump_64.c	x86/sev: Replace occurrences of sev_active() with cc_platform_has()	2021-10-04 11:46:58 +02:00
devicetree.c	Devicetree updates for v5.16:	2021-11-02 22:22:13 -07:00
doublefault_32.c	exit/doublefault: Remove apparently bogus comment about rewind_stack_do_exit	2021-10-20 13:09:43 -05:00
dumpstack.c	exit: Add and use make_task_dead.	2021-12-13 12:04:45 -06:00
dumpstack_32.c
dumpstack_64.c	x86/mm/64: Improve stack overflow warnings	2021-09-21 13:57:43 +02:00
e820.c	Power management updates for 5.13-rc1	2021-04-26 15:10:25 -07:00
early-quirks.c	pci-v5.17-fixes-1	2022-01-21 09:10:46 +02:00
early_printk.c
ebda.c
eisa.c
espfix_64.c
ftrace.c	x86: Add straight-line-speculation mitigation	2021-12-09 13:32:25 +01:00
ftrace_32.S	x86: Prepare asm files for straight-line-speculation	2021-12-08 12:25:37 +01:00
ftrace_64.S	x86: Prepare asm files for straight-line-speculation	2021-12-08 12:25:37 +01:00
head32.c
head64.c	- Flush *all* mappings from the TLB after switching to the trampoline	2022-01-10 09:51:38 -08:00
head_32.S	x86: Prepare asm files for straight-line-speculation	2021-12-08 12:25:37 +01:00
head_64.S	x86/mm/64: Flush global TLB on boot and AP bringup	2021-12-06 09:38:48 +01:00
hpet.c	rtc: Check return value from mc146818_get_time()	2021-12-16 21:50:06 +01:00
hw_breakpoint.c	x86/debug: Prevent data breakpoints on cpu_dr7	2021-02-05 20:13:12 +01:00
i8237.c
i8253.c
i8259.c	x86: Avoid magic number with ELCR register accesses	2021-08-10 23:31:43 +02:00
idt.c	X86 interrupt related changes:	2021-06-29 12:36:59 -07:00
io_delay.c
ioport.c
irq.c	x86/irq: Ensure PI wakeup handler is unregistered before module unload	2021-10-22 12:45:35 -04:00
irq_32.c	x86/softirq: Disable softirq stacks on PREEMPT_RT	2021-09-27 12:28:32 +02:00
irq_64.c	x86/softirq/64: Inline do_softirq_own_stack()	2021-02-10 23:34:17 +01:00
irq_work.c
irqflags.S	x86: Prepare asm files for straight-line-speculation	2021-12-08 12:25:37 +01:00
irqinit.c	x86/headers: Remove APIC headers from <asm/smp.h>	2020-08-06 16:13:09 +02:00
itmt.c	x86/sched: Decrease further the priorities of SMT siblings	2021-10-05 15:51:59 +02:00
jailhouse.c	locking/seqlock, headers: Untangle the spaghetti monster	2020-08-06 16:13:13 +02:00
jump_label.c	jump_labels: Mark __jump_label_transform() as __always_inlined to work around aggressive compiler un-inlining	2021-07-13 06:32:05 +02:00
kdebugfs.c
kexec-bzimage64.c	x86: Use ELF fields defined in 'struct kimage'	2021-03-08 12:06:29 -07:00
kgdb.c	x86: Fix various typos in comments	2021-03-18 15:31:53 +01:00
ksysfs.c
kvm.c	x86/kvm: Silence per-cpu pr_info noise about KVM clocks and steal time	2022-01-07 10:44:43 -05:00
kvmclock.c	x86/kvm: Silence per-cpu pr_info noise about KVM clocks and steal time	2022-01-07 10:44:43 -05:00
ldt.c	memcg: enable accounting for ldt_struct objects	2021-09-03 09:58:13 -07:00
machine_kexec_32.c	x86/kexec: Set_[gi]dt() -> native_[gi]dt_invalidate() in machine_kexec_*.c	2021-05-21 12:36:45 +02:00
machine_kexec_64.c	x86/sev: Replace occurrences of sev_active() with cc_platform_has()	2021-10-04 11:46:58 +02:00
Makefile	arch: Make ARCH_STACKWALK independent of STACKTRACE	2021-12-10 14:06:03 +00:00
mmconf-fam10h_64.c	x86/msr: Rename MSR_K8_SYSCFG to MSR_AMD64_SYSCFG	2021-05-10 07:51:38 +02:00
module.c	mm: defer kmemleak object creation of module_alloc()	2022-01-15 16:30:25 +02:00
mpparse.c	x86: Avoid magic number with ELCR register accesses	2021-08-10 23:31:43 +02:00
msr.c	x86/MSR: Filter MSR writes through X86_IOC_WRMSR_REGS ioctl too	2021-01-27 19:06:47 +01:00
nmi.c	x86/sev-es: Rename sev-es.{ch} to sev.{ch}	2021-05-10 07:40:27 +02:00
nmi_selftest.c
paravirt-spinlocks.c	x86/paravirt: Add new features for paravirt patching	2021-03-11 19:51:49 +01:00
paravirt.c	x86: Prepare inline-asm for straight-line-speculation	2021-12-08 19:23:12 +01:00
pci-dma.c	dma-mapping: move dma-debug.h to kernel/dma/	2020-10-06 07:07:05 +02:00
pci-iommu_table.c	x86: Remove definition of DEBUG	2021-01-15 08:23:10 +01:00
pci-swiotlb.c	x86/sme: Replace occurrences of sme_active() with cc_platform_has()	2021-10-04 11:46:46 +02:00
pcspeaker.c
perf_regs.c	- Remove all uses of TIF_IA32 and TIF_X32 and reclaim the two bits in the end	2020-12-14 13:45:26 -08:00
platform-quirks.c
pmem.c
probe_roms.c	x86/pci/probe_roms: Use to_pci_driver() instead of pci_dev->driver	2021-10-18 09:20:15 -05:00
process.c	RISCV:	2022-01-16 16:15:14 +02:00
process.h	x86: Snapshot thread flags	2021-12-01 00:06:43 +01:00
process_32.c	x86/fpu: Move context switch and exit to user inlines into sched.h	2021-10-20 15:27:27 +02:00
process_64.c	x86/fpu: Move context switch and exit to user inlines into sched.h	2021-10-20 15:27:27 +02:00
ptrace.c	x86/fpu: Remove internal.h dependency from fpu/signal.h	2021-10-20 15:27:29 +02:00
pvclock.c	x86: Fix various typos in comments	2021-03-18 15:31:53 +01:00
quirks.c	x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()	2020-10-06 11:18:04 +02:00
reboot.c	x86/mm: Flush global TLB when switching to trampoline page-table	2021-12-06 09:54:10 +01:00
reboot_fixups_32.c
relocate_kernel_32.S	x86: Prepare asm files for straight-line-speculation	2021-12-08 12:25:37 +01:00
relocate_kernel_64.S	x86: Prepare asm files for straight-line-speculation	2021-12-08 12:25:37 +01:00
resource.c	x86/PCI: revert "Ignore E820 reservations for bridge windows on newer systems"	2022-02-09 19:42:58 +01:00
rtc.c
setup.c	- Add support for decoding instructions which do MMIO accesses in order	2022-01-10 10:00:03 -08:00
setup_percpu.c	mm: percpu: add generic pcpu_populate_pte() function	2022-01-20 08:52:52 +02:00
sev-shared.c	x86/sev: Shorten GHCB terminate macro names	2021-11-15 20:31:16 +01:00
sev.c	- Add support for decoding instructions which do MMIO accesses in order	2022-01-10 10:00:03 -08:00
sev_verify_cbit.S	x86: Prepare asm files for straight-line-speculation	2021-12-08 12:25:37 +01:00
signal.c	x86/signal: Use fpu::__state_user_size for sigalt stack validation	2021-10-26 10:18:09 +02:00
signal_compat.c	signal: Verify the alignment and size of siginfo_t	2021-07-23 13:15:31 -05:00
smp.c	x86: Fix various typos in comments, take #2	2021-03-21 23:50:28 +01:00
smpboot.c	sched,x86: Don't use cluster topology for x86 hybrid CPUs	2021-12-08 22:15:37 +01:00
stacktrace.c	stacktrace: Move documentation for arch_stack_walk_reliable() to header	2021-03-10 15:52:31 +01:00
static_call.c	x86: Add straight-line-speculation mitigation	2021-12-09 13:32:25 +01:00
step.c	entry: Ensure trap after single-step on system call return	2021-02-06 00:21:42 +01:00
sys_ia32.c	x86: switch to kernel_clone()	2020-08-20 13:12:58 +02:00
sys_x86_64.c	x86/mm: Refine mmap syscall implementation	2021-01-05 19:07:42 +01:00
tboot.c	x86/boot/tboot: Avoid Wstringop-overread-warning	2021-03-23 00:16:13 +01:00
time.c
tls.c	x86/stackprotector/32: Make the canary into a regular percpu variable	2021-03-08 13:19:05 +01:00
tls.h	x86: switch to ->regset_get()	2020-07-27 14:31:07 -04:00
topology.c	x86: Fix various typos in comments	2021-03-18 15:31:53 +01:00
trace.c	trace/osnoise: Fix an ifdef comment	2021-10-25 23:02:36 -04:00
trace_clock.c
tracepoint.c
traps.c	- Do not #GP on userspace use of CLI/STI but pretend it was a NOP to	2021-11-02 07:56:47 -07:00
tsc.c	x86/tsc: Disable clocksource watchdog for TSC on qualified platorms	2021-12-02 00:40:36 +01:00
tsc_msr.c	Misc fixes and small updates all around the place:	2020-08-15 10:38:03 -07:00
tsc_sync.c	x86/tsc: Add a timer to make sure TSC_adjust is always checked	2021-12-02 00:40:35 +01:00
umip.c	x86/umip: Downgrade warning messages to debug loglevel	2021-09-25 13:23:28 +02:00
unwind_frame.c	x86/unwind: Recover kretprobe trampoline entry	2021-09-30 21:24:07 -04:00
unwind_guess.c	x86/unwind: Recover kretprobe trampoline entry	2021-09-30 21:24:07 -04:00
unwind_orc.c	Merge branch 'akpm' (patches from Andrew)	2021-11-09 10:11:53 -08:00
uprobes.c	x86/uprobes: Convert to insn_decode()	2021-03-15 12:05:03 +01:00
verify_cpu.S	x86: Prepare asm files for straight-line-speculation	2021-12-08 12:25:37 +01:00
vm86_32.c	signal: Replace force_fatal_sig with force_exit_sig when in doubt	2021-11-19 09:15:58 -06:00
vmlinux.lds.S	x86: Remove .fixup section	2021-12-11 09:09:50 +01:00
vsmp_64.c
x86_init.c	PCI/MSI: Make arch_restore_msi_irqs() less horrible.	2021-12-09 11:52:21 +01:00