AuxXxilium/linux_dsm_epyc7002
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0696d059f2
linux_dsm_epyc7002/arch/x86/kernel
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Thomas Gleixner 0696d059f2 x86/vector: Use correct per cpu variable in free_moved_vector() 
free_moved_vector() accesses the per cpu vector array with this_cpu_write()
to clear the vector. The function has two call sites:

 1) The vector cleanup IPI
 2) The force_complete_move() code path

For #1 this_cpu_write() is correct as it runs on the CPU on which the
vector needs to be freed.

For #2 this_cpu_write() is wrong because the function is called from an
outgoing CPU which is not necessarily the CPU on which the previous vector
needs to be freed. As a result it sets the vector on the outgoing CPU to
NULL, which is pointless as that CPU does not handle interrupts
anymore. What's worse is that it leaves the vector on the previous target
CPU in place which later on triggers the BUG_ON(vector) in the vector
allocation code when the vector gets reused. That's possible because the
bitmap allocator entry of that CPU is freed correctly.

Always use the CPU to which the vector was associated and clear the vector
entry on that CPU. Fixup the tracepoint as well so it tracks on which CPU
the vector gets removed.

Fixes: 69cde0004a ("x86/vector: Use matrix allocator for vector assignment")
Reported-by: Petri Latvala <petri.latvala@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rui Zhang <rui.zhang@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Yu Chen <yu.c.chen@intel.com>
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1710161614430.1973@nanos
2017-10-17 16:45:09 +02:00
..
acpi dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
apic x86/vector: Use correct per cpu variable in free_moved_vector() 2017-10-17 16:45:09 +02:00
cpu x86/mm/32: Move setup_clear_cpu_cap(X86_FEATURE_PCID) earlier 2017-09-17 18:59:08 +02:00
fpu x86/fpu: Use using_compacted_format() instead of open coded X86_FEATURE_XSAVES 2017-09-26 09:43:48 +02:00
kprobes kprobes/x86: Do not jump-optimize kprobes on irq entry code 2017-08-10 16:28:53 +02:00
.gitignore
alternative.c x86: Clarify/fix no-op barriers for text_poke_bp() 2017-08-10 17:35:19 +02:00
amd_gart_64.c x86: remove arch specific dma_supported implementation 2017-06-28 06:54:46 -07:00
amd_nb.c
apb_timer.c
aperture_64.c
apm_32.c dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
asm-offsets_32.c x86/lguest: Remove lguest support 2017-08-24 09:57:28 +02:00
asm-offsets_64.c x86/xen: Get rid of paravirt op adjust_exception_frame 2017-08-31 21:35:10 +02:00
asm-offsets.c
audit_64.c
bootflag.c
check.c
cpuid.c
crash_dump_32.c
crash_dump_64.c
crash.c kexec: move vmcoreinfo out of the kernel's .bss section 2017-07-12 16:25:59 -07:00
devicetree.c x86/devicetree: Convert to using %pOF instead of ->full_name 2017-07-21 10:14:15 +02:00
doublefault.c
dumpstack_32.c x86/dumpstack: Fix interrupt and exception stack boundary checks 2017-07-18 10:56:23 +02:00
dumpstack_64.c x86/dumpstack: Fix interrupt and exception stack boundary checks 2017-07-18 10:56:23 +02:00
dumpstack.c x86/asm/32: Remove a bunch of '& 0xffff' from pt_regs segment reads 2017-07-30 12:04:41 +02:00
e820.c x86/boot/e820: Add support to determine the E820 type of an address 2017-07-18 11:38:01 +02:00
early_printk.c
early-quirks.c ACPI updates for v4.14-rc1 2017-09-05 12:45:03 -07:00
ebda.c
eisa.c x86/eisa: Add missing include 2017-08-31 21:34:48 +02:00
espfix_64.c x86/mm: Provide general kernel support for memory encryption 2017-07-18 11:38:00 +02:00
ftrace_32.S x86/ftrace: Fix ebp in ftrace_regs_caller that screws up unwinder 2017-04-21 09:48:16 +02:00
ftrace_64.S x86/ftrace: Use Makefile logic instead of #ifdef for compiling ftrace_*.o 2017-03-24 10:14:08 +01:00
ftrace.c x86/ftrace: Make sure that ftrace trampolines are not RWX 2017-05-26 22:37:02 -04:00
head32.c x86/idt: Move early IDT setup out of 32-bit asm 2017-08-29 12:07:26 +02:00
head64.c Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-09-04 17:43:56 -07:00
head_32.S x86/idt: Remove superfluous ALIGNment 2017-08-31 15:47:02 +02:00
head_64.S x86/mm: Provide general kernel support for memory encryption 2017-07-18 11:38:00 +02:00
hpet.c x86/hpet: Cure interface abuse in the resume path 2017-08-01 13:02:37 +02:00
hw_breakpoint.c
i8237.c
i8253.c
i8259.c x86/irq/vector: Initialize matrix allocator 2017-09-25 20:51:56 +02:00
idt.c x86/vector: Rename used_vectors to system_vectors 2017-09-25 20:51:52 +02:00
io_delay.c dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
ioport.c
irq_32.c x86/asm: Use register variable to get stack pointer value 2017-09-29 19:39:44 +02:00
irq_64.c
irq_work.c x86/irq_work: Make it depend on APIC 2017-08-29 11:42:30 +02:00
irq.c x86/irq: Simplify hotplug vector accounting 2017-09-25 20:52:02 +02:00
irqinit.c x86/irq/vector: Initialize matrix allocator 2017-09-25 20:51:56 +02:00
itmt.c
jump_label.c jump_label: Reorder hotplug lock and jump_label_lock 2017-05-26 10:10:45 +02:00
kdebugfs.c x86, mpparse, x86/acpi, x86/PCI, x86/dmi, SFI: Use memremap() for RAM mappings 2017-07-18 11:37:58 +02:00
kexec-bzimage64.c x86/boot/e820: Rename the e820_table_firmware to e820_table_kexec 2017-07-05 10:09:02 +02:00
kgdb.c
ksysfs.c x86/sysfs: Fix off-by-one error in loop termination 2017-09-25 09:36:16 +02:00
kvm.c kvm/x86: Avoid async PF preempting the kernel incorrectly 2017-10-04 18:28:53 +02:00
kvmclock.c
ldt.c x86/ldt/64: Refresh DS and ES when modify_ldt changes an entry 2017-07-27 09:12:57 +02:00
livepatch.c
machine_kexec_32.c x86/idt: Consolidate IDT invalidation 2017-08-29 12:07:26 +02:00
machine_kexec_64.c x86/mm, kexec: Fix memory corruption with SME on successive kexecs 2017-07-30 12:09:12 +02:00
Makefile x86/idt: Create file for IDT related code 2017-08-29 12:07:25 +02:00
mmconf-fam10h_64.c
module.c x86/unwind: Add the ORC unwinder 2017-07-26 13:18:20 +02:00
mpparse.c x86/boot: Use memremap() to map the MPF and MPC data 2017-07-18 11:38:02 +02:00
msr.c
nmi_selftest.c x86/nmi: Fix timeout test in test_nmi_ipi() 2017-06-20 12:52:43 +02:00
nmi.c x86/nmi: Use raw lock 2017-08-16 20:40:09 +02:00
paravirt_patch_32.c
paravirt_patch_64.c
paravirt-spinlocks.c
paravirt.c x86/paravirt: Remove no longer used paravirt functions 2017-09-13 10:55:15 +02:00
pci-calgary_64.c x86: remove arch specific dma_supported implementation 2017-06-28 06:54:46 -07:00
pci-dma.c x86, swiotlb: Add memory encryption support 2017-07-18 11:38:03 +02:00
pci-iommu_table.c
pci-nommu.c x86, swiotlb: Add memory encryption support 2017-07-18 11:38:03 +02:00
pci-swiotlb.c x86, swiotlb: Add memory encryption support 2017-07-18 11:38:03 +02:00
pcspeaker.c
perf_regs.c
platform-quirks.c x86/lguest: Remove lguest support 2017-08-24 09:57:28 +02:00
pmem.c
probe_roms.c
process_32.c Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-09-04 13:56:37 -07:00
process_64.c Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-09-04 13:56:37 -07:00
process.c x86/mm, kexec: Allow kexec to be used with SME 2017-07-18 11:38:04 +02:00
ptrace.c
pvclock.c
quirks.c treewide: Consolidate Apple DMI checks 2017-08-03 23:26:22 +02:00
reboot_fixups_32.c
reboot.c dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
relocate_kernel_32.S
relocate_kernel_64.S x86/mm, kexec: Fix memory corruption with SME on successive kexecs 2017-07-30 12:09:12 +02:00
resource.c
rtc.c
setup_percpu.c treewide: make "nr_cpu_ids" unsigned 2017-09-08 18:26:48 -07:00
setup.c x86/apic: Sanitize 32/64bit APIC callbacks 2017-09-25 20:51:50 +02:00
signal_compat.c signal: Remove kernel interal si_code magic 2017-07-24 14:30:28 -05:00
signal.c x86/fpu: Rename fpu::fpstate_active to fpu::initialized 2017-09-26 09:43:36 +02:00
smp.c x86/tracing: Disentangle pagefault and resched IPI tracing key 2017-08-29 11:42:29 +02:00
smpboot.c x86/irq: Simplify hotplug vector accounting 2017-09-25 20:52:02 +02:00
stacktrace.c
step.c x86/asm/32: Remove a bunch of '& 0xffff' from pt_regs segment reads 2017-07-30 12:04:41 +02:00
sys_x86_64.c x86/mm: Prepare to expose larger address space to userspace 2017-07-21 10:05:18 +02:00
sysfb_efi.c
sysfb_simplefb.c
sysfb.c
tboot.c iommu/vt-d: Correctly disable Intel IOMMU force on 2017-06-15 16:41:10 +02:00
tce_64.c
time.c x86/apic: Initialize interrupt mode after timer init 2017-09-25 15:03:17 +02:00
tls.c x86/asm: Replace access to desc_struct:a/b fields 2017-08-29 12:07:25 +02:00
tls.h
topology.c
trace_clock.c
tracepoint.c x86/tracing: Disentangle pagefault and resched IPI tracing key 2017-08-29 11:42:29 +02:00
traps.c Merge branch 'irq/urgent' into x86/apic 2017-10-12 11:02:50 +02:00
tsc_msr.c
tsc_sync.c x86/tsc: Remove the TSC_ADJUST clamp 2017-06-04 21:55:53 +02:00
tsc.c Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-07-03 18:01:50 -07:00
unwind_frame.c Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-09-04 09:52:57 -07:00
unwind_guess.c x86/unwind: Add the ORC unwinder 2017-07-26 13:18:20 +02:00
unwind_orc.c x86/unwind: Add the ORC unwinder 2017-07-26 13:18:20 +02:00
uprobes.c
verify_cpu.S
vm86_32.c x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly() 2017-04-26 10:02:06 +02:00
vmlinux.lds.S x86/unwind: Add the ORC unwinder 2017-07-26 13:18:20 +02:00
vsmp_64.c x86/apic: Remove unused callbacks 2017-09-25 20:51:58 +02:00
x86_init.c x86/init: Add intr_mode_init to x86_init_ops 2017-09-25 15:03:17 +02:00