Thomas Gleixner ea8efcd441 x86/speculation: Handle HT correctly on AMD ... commit 1f50ddb4f4189243c05926b842dc1a0332195f31 upstream The AMD64_LS_CFG MSR is a per core MSR on Family 17H CPUs. That means when hyperthreading is enabled the SSBD bit toggle needs to take both cores into account. Otherwise the following situation can happen: CPU0 CPU1 disable SSB disable SSB enable SSB <- Enables it for the Core, i.e. for CPU0 as well So after the SSB enable on CPU1 the task on CPU0 runs with SSB enabled again. On Intel the SSBD control is per core as well, but the synchronization logic is implemented behind the per thread SPEC_CTRL MSR. It works like this: CORE_SPEC_CTRL = THREAD0_SPEC_CTRL | THREAD1_SPEC_CTRL i.e. if one of the threads enables a mitigation then this affects both and the mitigation is only disabled in the core when both threads disabled it. Add the necessary synchronization logic for AMD family 17H. Unfortunately that requires a spinlock to serialize the access to the MSR, but the locks are only shared between siblings. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Srivatsa S. Bhat <srivatsa@csail.mit.edu> Reviewed-by: Matt Helsley (VMware) <matt.helsley@gmail.com> Reviewed-by: Alexey Makhalov <amakhalov@vmware.com> Reviewed-by: Bo Gan <ganb@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-07-25 10:18:30 +02:00
..
acpi	x86/acpi: Reduce code duplication in mp_override_legacy_irq()	2018-01-17 09:35:26 +01:00
apic	x86/cpufeature: Replace the old static_cpu_has() with safe variant	2018-07-17 11:31:44 +02:00
cpu	x86/cpufeatures: Add FEATURE_ZEN	2018-07-25 10:18:29 +02:00
fpu	x86/fpu: Fix math emulation in eager fpu mode	2018-06-16 09:54:25 +02:00
kprobes	kprobes/x86: Do not modify singlestep buffer while resuming	2018-07-11 16:03:47 +02:00
.gitignore
alternative.c	x86/paravirt: Remove 'noreplace-paravirt' cmdline option	2018-02-25 11:03:54 +01:00
amd_gart_64.c
amd_nb.c	x86/amd_nb: Fix boot crash on non-AMD systems	2016-07-27 09:47:29 -07:00
apb_timer.c
aperture_64.c
apm_32.c
asm-offsets_32.c
asm-offsets_64.c
asm-offsets.c
audit_64.c
bootflag.c
check.c
cpuid.c
crash_dump_32.c
crash_dump_64.c
crash.c
devicetree.c	x86/devicetree: Fix device IRQ settings in DT	2018-05-30 07:49:13 +02:00
doublefault.c
dumpstack_32.c
dumpstack_64.c
dumpstack.c
e820.c	x86/cpufeature: Carve out X86_FEATURE_*	2018-07-17 11:31:44 +02:00
early_printk.c
early-quirks.c	drm/i915: Account for TSEG size when determining 865G stolen base	2016-10-31 04:13:58 -06:00
espfix_64.c	kaiser: add "nokaiser" boot option, using ALTERNATIVE	2018-01-05 15:44:25 +01:00
ftrace.c	ftrace/x86: Fix triple fault with graph tracing and suspend-to-ram	2017-05-02 21:19:56 -07:00
head_32.S	x86/cpufeature: Carve out X86_FEATURE_*	2018-07-17 11:31:44 +02:00
head_64.S	x86/boot: Simplify kernel load address alignment check	2018-07-17 11:31:45 +02:00
head.c
head32.c
head64.c	x86/kasan: Fix boot with KASAN=y and PROFILE_ANNOTATED_BRANCHES=y	2017-03-22 12:04:18 +01:00
hpet.c	x86/cpufeature: Carve out X86_FEATURE_*	2018-07-17 11:31:44 +02:00
hw_breakpoint.c	x86/cpufeature: Remove unused and seldomly used cpu_has_xx macros	2018-06-16 09:54:24 +02:00
i386_ksyms_32.c	x86/hweight: Get rid of the special calling convention	2018-04-24 09:32:04 +02:00
i8237.c
i8253.c
i8259.c	x86: i8259: export legacy_pic symbol	2018-03-24 10:58:40 +01:00
io_delay.c
ioport.c	x86/iopl: Fix iopl capability check on Xen PV	2016-04-12 09:08:38 -07:00
irq_32.c	x86/retpoline/irq32: Convert assembler indirect jumps	2018-01-23 19:50:13 +01:00
irq_64.c
irq_work.c	treewide: Remove old email address	2015-11-23 09:44:58 +01:00
irq.c	x86/irq: Do not substract irq_tlb_count from irq_call_count	2017-12-25 14:22:09 +01:00
irqflags.S	x86/paravirt: Make native_save_fl() extern inline	2018-07-25 10:18:18 +02:00
irqinit.c	KAISER: Kernel Address Isolation	2018-01-05 15:44:23 +01:00
jump_label.c
kdebugfs.c
kexec-bzimage64.c
kgdb.c
ksysfs.c
kvm.c	KVM: async_pf: make rcu irq exit if not triggered from idle task	2017-08-11 09:08:47 -07:00
kvmclock.c	x86/vdso: Get pvclock data from the vvar VMA instead of the fixmap	2018-01-05 15:44:27 +01:00
ldt.c	x86/mm: Factor out LDT init from context init	2018-07-25 10:18:21 +02:00
livepatch.c	livepatch: Fix crash with !CONFIG_DEBUG_SET_MODULE_RONX	2015-11-06 11:10:03 +01:00
machine_kexec_32.c	x86/kexec: Avoid double free_page() upon do_kexec_load() failure	2018-05-26 08:49:01 +02:00
machine_kexec_64.c	x86/kexec: Avoid double free_page() upon do_kexec_load() failure	2018-05-26 08:49:01 +02:00
Makefile	x86/paravirt: Make native_save_fl() extern inline	2018-07-25 10:18:18 +02:00
mcount_64.S	x86/retpoline/ftrace: Convert ftrace assembler indirect jumps	2018-01-23 19:50:13 +01:00
mmconf-fam10h_64.c
module.c	x86: Treat R_X86_64_PLT32 as R_X86_64_PC32	2018-03-18 11:17:52 +01:00
mpparse.c
msr.c	x86/cpufeature: Carve out X86_FEATURE_*	2018-07-17 11:31:44 +02:00
nmi_selftest.c
nmi.c
paravirt_patch_32.c
paravirt_patch_64.c	x86/paravirt: Dont patch flush_tlb_single	2018-01-05 15:44:26 +01:00
paravirt-spinlocks.c
paravirt.c	x86/paravirt: Do not trace _paravirt_ident_*() functions	2016-09-24 10:07:37 +02:00
pci-calgary_64.c	x86/pci-calgary: Fix iommu_free() comparison of unsigned expression >= 0	2017-05-14 13:32:55 +02:00
pci-dma.c	mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd	2015-11-06 17:50:42 -08:00
pci-iommu_table.c
pci-nommu.c
pci-swiotlb.c
pcspeaker.c
perf_regs.c
pmem.c	libnvdimm, e820: skip module loading when no type-12	2015-11-30 09:10:33 -08:00
probe_roms.c
process_32.c
process_64.c	x86/iopl/64: Properly context-switch IOPL on Xen PV	2016-04-12 09:08:38 -07:00
process.c	x86/speculation: Handle HT correctly on AMD	2018-07-25 10:18:30 +02:00
ptrace.c	x86/dumpstack: Fix x86_32 kernel_stack_pointer() previous stack access	2016-10-16 17:36:15 +02:00
pvclock.c	pvclock: Add CPU barriers to get correct version value	2016-08-10 11:49:27 +02:00
quirks.c
reboot_fixups_32.c
reboot.c	x86/mm/64: Fix reboot interaction with CR4.PCIDE	2018-01-02 20:33:24 +01:00
relocate_kernel_32.S
relocate_kernel_64.S
resource.c
rtc.c	x86/paravirt: Prevent rtc_cmos platform device init on PV guests	2015-12-19 21:35:13 +01:00
setup_percpu.c
setup.c	x86/kaiser: Move feature detection up	2018-01-05 15:44:26 +01:00
signal_compat.c
signal.c	x86/signal: Fix restart_syscall number for x32 tasks	2015-12-05 18:52:14 +01:00
smp.c
smpboot.c	x86/speculation: Handle HT correctly on AMD	2018-07-25 10:18:30 +02:00
stacktrace.c
step.c
sys_x86_64.c	mm: larger stack guard gap, between vmas	2017-06-26 07:13:11 +02:00
sysfb_efi.c	x86/sysfb_efi: Fix valid BAR address range check	2016-05-11 11:21:20 +02:00
sysfb_simplefb.c
sysfb.c
tboot.c	x86/pti: Make unpoison of pgd for trusted boot work for real	2018-02-03 17:04:25 +01:00
tce_64.c
test_nx.c
test_rodata.c
time.c
tls.c
tls.h
topology.c
trace_clock.c
tracepoint.c	kaiser: merged update	2018-01-05 15:44:23 +01:00
traps.c	x86/fpu: Fix math emulation in eager fpu mode	2018-06-16 09:54:25 +02:00
tsc_msr.c	x86/tsc: Read all ratio bits from MSR_PLATFORM_INFO	2016-05-11 11:21:19 +02:00
tsc_sync.c
tsc.c	x86/tsc: Prevent 32bit truncation in calc_hpet_ref()	2018-04-29 07:50:01 +02:00
uprobes.c	uprobes/x86: Remove incorrect WARN_ON() in uprobe_init_insn()	2018-07-17 11:31:45 +02:00
verify_cpu.S	x86/cpufeature: Carve out X86_FEATURE_*	2018-07-17 11:31:44 +02:00
vm86_32.c	x86/cpufeature: Replace the old static_cpu_has() with safe variant	2018-07-17 11:31:44 +02:00
vmlinux.lds.S	x86/alternatives: Add an auxilary section	2018-07-17 11:31:44 +02:00
vsmp_64.c
x86_init.c
x8664_ksyms_64.c	x86/hweight: Get rid of the special calling convention	2018-04-24 09:32:04 +02:00