* SMT/Hyperthreading detection not always correct
@ 2018-09-03 11:55 Hans van Kranenburg
2018-09-03 13:13 ` Jan Beulich
0 siblings, 1 reply; 5+ messages in thread
From: Hans van Kranenburg @ 2018-09-03 11:55 UTC (permalink / raw)
To: xen-devel
Hi,
I ran into the situation where I got this banner in the xl dmesg...
(XEN) ***************************************************
(XEN) Booted on L1TF-vulnerable hardware with SMT/Hyperthreading
(XEN) enabled. Please assess your configuration and choose an
(XEN) explicit 'smt=<bool>' setting. See XSA-273.
(XEN) ***************************************************
...while hyperthreading is disabled in the bios settings.
Some lines from the POST messages:
ProLiant System BIOS - P68 (05/21/2018)
[...]
2 Processor(s) detected, 12 total cores enabled, Hyperthreading is disabled
Proc 1: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz
Proc 2: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz
More debug info below. See the thread '"Booted on L1TF-vulnerable
hardware with SMT/Hyperthreading enabled" .. or not?' in xen-users for
even more.
Reaction from Andrew on xen-users thread: "Looks like Xen does have a
bug identifying the topology. Hyperthreading is definitely off, but
there is no MADT so information is probably being derived from the
legacy MP table.For now, set smt=0 if you want to skip the warning, and
can you email xen-devel with a bug report please? "
-# xl dmesg
(XEN) parameter "placeholder" unknown!
(XEN) Xen version 4.11.1-pre (Debian
4.11.1~pre+1.733450b39b-1~exp1~mxbp9+1) (hans@knorrie.org) (gcc (Debian
6.3.0-18+deb9u1) 6.3.0 20170516) debug=n Wed Aug 22 15:26:44 UTC 2018
(XEN) Bootloader: GRUB 2.02~beta3-5
(XEN) Command line: placeholder dom0_max_vcpus=4 dom0_mem=4G,max:4G
com2=115200,8n1 console=com2,vga noreboot xpti=no-dom0 cpuinfo
dom0_vcpus_pin
(XEN) Xen image load base address: 0
(XEN) Video information:
(XEN) VGA is text mode 80x25, font 8x16
(XEN) VBE/DDC methods: none; EDID transfer time: 2 seconds
(XEN) EDID info not retrieved because no DDC retrieval method detected
(XEN) Disc information:
(XEN) Found 1 MBR signatures
(XEN) Found 1 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN) 0000000000000000 - 000000000009f400 (usable)
(XEN) 000000000009f400 - 00000000000a0000 (reserved)
(XEN) 00000000000f0000 - 0000000000100000 (reserved)
(XEN) 0000000000100000 - 00000000d762f000 (usable)
(XEN) 00000000d762f000 - 00000000d763c000 (ACPI data)
(XEN) 00000000d763c000 - 00000000d763d000 (usable)
(XEN) 00000000d763d000 - 00000000dc000000 (reserved)
(XEN) 00000000fec00000 - 00000000fee10000 (reserved)
(XEN) 00000000ff800000 - 0000000100000000 (reserved)
(XEN) 0000000100000000 - 0000001b27fff000 (usable)
(XEN) New Xen image base address: 0xd7000000
(XEN) ACPI: RSDP 000F4F00, 0024 (r2 HP )
(XEN) ACPI: XSDT D7630140, 00B4 (r1 HP ProLiant 2 �\x04 162E)
(XEN) ACPI: FACP D7630240, 00F4 (r3 HP ProLiant 2 �\x04 162E)
(XEN) ACPI: DSDT D7630340, 20BD (r1 HP DSDT 1 INTL 20030228)
(XEN) ACPI: FACS D762F100, 0040
(XEN) ACPI: SPCR D762F140, 0050 (r1 HP SPCRRBSU 1 �\x04 162E)
(XEN) ACPI: MCFG D762F1C0, 003C (r1 HP ProLiant 1 0)
(XEN) ACPI: HPET D762F200, 0038 (r1 HP ProLiant 2 �\x04 162E)
(XEN) ACPI: FFFF D762F240, 0064 (r2 HP ProLiant 2 �\x04 162E)
(XEN) ACPI: SPMI D762F2C0, 0040 (r5 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: ERST D762F300, 01D0 (r1 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: APIC D762F500, 015E (r1 HP ProLiant 2 0)
(XEN) ACPI: SRAT D762F680, 0570 (r1 HP Proliant 1 �\x04 162E)
(XEN) ACPI: FFFF D762FC00, 0176 (r1 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: BERT D762FD80, 0030 (r1 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: HEST D762FDC0, 00BC (r1 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: DMAR D762FE80, 0146 (r1 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: SSDT D7632400, 0125 (r3 HP CRSPCI0 2 HP 1)
(XEN) ACPI: SSDT D7632540, 01CF (r3 HP riser1a 2 INTL 20061109)
(XEN) ACPI: SSDT D7632740, 03BB (r1 HP pcc 1 INTL 20090625)
(XEN) ACPI: SSDT D7632B00, 0377 (r1 HP pmab 1 INTL 20090625)
(XEN) ACPI: SSDT D7632E80, 2094 (r1 INTEL PPM RCM 1 INTL 20061109)
(XEN) System RAM: 110581MB (113235768kB)
(XEN) Domain heap initialised DMA width 32 bits
(XEN) IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23
(XEN) IOAPIC[1]: apic_id 0, version 32, address 0xfec80000, GSI 24-47
(XEN) Enabling APIC mode: Phys. Using 2 I/O APICs
(XEN) Failed to get Error Log Address Range.
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 0
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) Speculative mitigation facilities:
(XEN) Hardware features: IBRS/IBPB STIBP L1D_FLUSH SSBD
(XEN) Compiled-in support: INDIRECT_THUNK SHADOW_PAGING
(XEN) Xen settings: BTI-Thunk RETPOLINE, SPEC_CTRL: IBRS- SSBD-,
Other: IBPB L1D_FLUSH
(XEN) L1TF: believed vulnerable, maxphysaddr L1D 44, CPUID 40, Safe
address 10000000000
(XEN) Support for VMs: PV: MSR_SPEC_CTRL RSB EAGER_FPU, HVM:
MSR_SPEC_CTRL RSB EAGER_FPU
(XEN) XPTI (64-bit PV only): Dom0 disabled, DomU disabled
(XEN) PV L1TF shadowing: Dom0 disabled, DomU enabled
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Initializing CPU#0
(XEN) Platform timer is 14.318MHz HPET
(XEN) Detected 3066.790 MHz processor.
(XEN) Initing memory sharing.
(XEN) [VT-D]Disabling IOMMU due to Intel 5500/5520/X58 Chipset errata
#47, #53
(XEN) I/O virtualisation disabled
(XEN) CPU0: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) Enabled directed EOI with ioapic_ack_old on!
(XEN) ENABLING IO-APIC IRQs
(XEN) -> Using old ACK method
(XEN) Allocated console ring of 32 KiB.
(XEN) VMX: Supported advanced features:
(XEN) - APIC MMIO access virtualisation
(XEN) - APIC TPR shadow
(XEN) - Extended Page Tables (EPT)
(XEN) - Virtual-Processor Identifiers (VPID)
(XEN) - Virtual NMI
(XEN) - MSR direct-access bitmap
(XEN) - Unrestricted Guest
(XEN) HVM: ASIDs enabled.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging (HAP) detected
(XEN) HVM: HAP page sizes: 4kB, 2MB, 1GB
(XEN) CPU 0 APIC 0 -> Node 0
(XEN) CPU 1 APIC 2 -> Node 0
(XEN) Booting processor 1/2 eip 8f000
(XEN) Initializing CPU#1
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 1
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU1: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 2 APIC 4 -> Node 0
(XEN) Booting processor 2/4 eip 8f000
(XEN) Initializing CPU#2
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 2
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU2: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 3 APIC 16 -> Node 0
(XEN) Booting processor 3/16 eip 8f000
(XEN) Initializing CPU#3
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 8
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU3: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 4 APIC 18 -> Node 0
(XEN) Booting processor 4/18 eip 8f000
(XEN) Initializing CPU#4
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 9
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU4: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 5 APIC 20 -> Node 0
(XEN) Booting processor 5/20 eip 8f000
(XEN) Initializing CPU#5
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 10
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU5: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 6 APIC 32 -> Node 1
(XEN) Booting processor 6/32 eip 8f000
(XEN) Initializing CPU#6
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 0
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU6: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 7 APIC 34 -> Node 1
(XEN) Booting processor 7/34 eip 8f000
(XEN) Initializing CPU#7
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 1
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU7: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 8 APIC 36 -> Node 1
(XEN) Booting processor 8/36 eip 8f000
(XEN) Initializing CPU#8
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 2
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU8: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 9 APIC 48 -> Node 1
(XEN) Booting processor 9/48 eip 8f000
(XEN) Initializing CPU#9
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 8
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU9: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 10 APIC 50 -> Node 1
(XEN) Booting processor 10/50 eip 8f000
(XEN) Initializing CPU#10
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 9
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU10: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 11 APIC 52 -> Node 1
(XEN) Booting processor 11/52 eip 8f000
(XEN) Initializing CPU#11
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 10
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU11: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) Brought up 12 CPUs
(XEN) Dom0 has maximum 816 PIRQs
(XEN) Xen kernel: 64-bit, lsb, compat32
(XEN) Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x266a000
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN) Dom0 alloc.: 0000000d98000000->0000000d9c000000 (1025804 pages
to be allocated)
(XEN) Init. ramdisk: 0000001b2650c000->0000001b27dffa74
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN) Loaded kernel: ffffffff81000000->ffffffff8266a000
(XEN) Init. ramdisk: 0000000000000000->0000000000000000
(XEN) Phys-Mach map: 0000008000000000->0000008000800000
(XEN) Start info: ffffffff8266a000->ffffffff8266a4b4
(XEN) Xenstore ring: 0000000000000000->0000000000000000
(XEN) Console ring: 0000000000000000->0000000000000000
(XEN) Page tables: ffffffff8266b000->ffffffff82682000
(XEN) Boot stack: ffffffff82682000->ffffffff82683000
(XEN) TOTAL: ffffffff80000000->ffffffff82800000
(XEN) ENTRY ADDRESS: ffffffff82433180
(XEN) Dom0 has maximum 4 VCPUs
(XEN) Initial low memory virq threshold set at 0x4000 pages.
(XEN) Scrubbing Free RAM on 2 nodes using 12 CPUs
(XEN)
.........................................................................done.
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
(XEN) ***************************************************
(XEN) Booted on L1TF-vulnerable hardware with SMT/Hyperthreading
(XEN) enabled. Please assess your configuration and choose an
(XEN) explicit 'smt=<bool>' setting. See XSA-273.
(XEN) ***************************************************
(XEN) 3... 2... 1...
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
input to Xen)
(XEN) Freed 476kB init memory
-# cpuid -r
CPU 0:
0x00000000 0x00: eax=0x0000000b ebx=0x756e6547 ecx=0x6c65746e
edx=0x49656e69
0x00000001 0x00: eax=0x000206c2 ebx=0x00200800 ecx=0x029ee3ff
edx=0xbfebfbff
0x00000002 0x00: eax=0x55035a01 ebx=0x00f0b0ff ecx=0x00000000
edx=0x00ca0000
0x00000003 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x00000004 0x00: eax=0x3c004121 ebx=0x01c0003f ecx=0x0000003f
edx=0x00000000
0x00000004 0x01: eax=0x3c004122 ebx=0x00c0003f ecx=0x0000007f
edx=0x00000000
0x00000004 0x02: eax=0x3c004143 ebx=0x01c0003f ecx=0x000001ff
edx=0x00000000
0x00000004 0x03: eax=0x3c07c163 ebx=0x03c0003f ecx=0x00002fff
edx=0x00000002
0x00000005 0x00: eax=0x00000040 ebx=0x00000040 ecx=0x00000003
edx=0x00001120
0x00000006 0x00: eax=0x00000007 ebx=0x00000002 ecx=0x00000009
edx=0x00000000
0x00000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x9c000000
0x00000008 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x00000009 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x0000000a 0x00: eax=0x07300403 ebx=0x00000004 ecx=0x00000000
edx=0x00000603
0x0000000b 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000000
0x0000000b 0x01: eax=0x00000005 ebx=0x0000000c ecx=0x00000201
edx=0x00000000
0x80000000 0x00: eax=0x80000008 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80000001 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000001
edx=0x2c100800
0x80000002 0x00: eax=0x65746e49 ebx=0x2952286c ecx=0x6f655820
edx=0x2952286e
0x80000003 0x00: eax=0x55504320 ebx=0x20202020 ecx=0x20202020
edx=0x58202020
0x80000004 0x00: eax=0x35373635 ebx=0x20402020 ecx=0x37302e33
edx=0x007a4847
0x80000005 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80000006 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x01006040
edx=0x00000000
0x80000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000100
0x80000008 0x00: eax=0x00003028 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80860000 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000000
0xc0000000 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000000
CPU 1:
0x00000000 0x00: eax=0x0000000b ebx=0x756e6547 ecx=0x6c65746e
edx=0x49656e69
0x00000001 0x00: eax=0x000206c2 ebx=0x02200800 ecx=0x029ee3ff
edx=0xbfebfbff
0x00000002 0x00: eax=0x55035a01 ebx=0x00f0b0ff ecx=0x00000000
edx=0x00ca0000
0x00000003 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x00000004 0x00: eax=0x3c004121 ebx=0x01c0003f ecx=0x0000003f
edx=0x00000000
0x00000004 0x01: eax=0x3c004122 ebx=0x00c0003f ecx=0x0000007f
edx=0x00000000
0x00000004 0x02: eax=0x3c004143 ebx=0x01c0003f ecx=0x000001ff
edx=0x00000000
0x00000004 0x03: eax=0x3c07c163 ebx=0x03c0003f ecx=0x00002fff
edx=0x00000002
0x00000005 0x00: eax=0x00000040 ebx=0x00000040 ecx=0x00000003
edx=0x00001120
0x00000006 0x00: eax=0x00000007 ebx=0x00000002 ecx=0x00000009
edx=0x00000000
0x00000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x9c000000
0x00000008 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x00000009 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x0000000a 0x00: eax=0x07300403 ebx=0x00000004 ecx=0x00000000
edx=0x00000603
0x0000000b 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000002
0x0000000b 0x01: eax=0x00000005 ebx=0x0000000c ecx=0x00000201
edx=0x00000002
0x80000000 0x00: eax=0x80000008 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80000001 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000001
edx=0x2c100800
0x80000002 0x00: eax=0x65746e49 ebx=0x2952286c ecx=0x6f655820
edx=0x2952286e
0x80000003 0x00: eax=0x55504320 ebx=0x20202020 ecx=0x20202020
edx=0x58202020
0x80000004 0x00: eax=0x35373635 ebx=0x20402020 ecx=0x37302e33
edx=0x007a4847
0x80000005 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80000006 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x01006040
edx=0x00000000
0x80000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000100
0x80000008 0x00: eax=0x00003028 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80860000 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000002
0xc0000000 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000002
CPU 2:
0x00000000 0x00: eax=0x0000000b ebx=0x756e6547 ecx=0x6c65746e
edx=0x49656e69
0x00000001 0x00: eax=0x000206c2 ebx=0x04200800 ecx=0x029ee3ff
edx=0xbfebfbff
0x00000002 0x00: eax=0x55035a01 ebx=0x00f0b0ff ecx=0x00000000
edx=0x00ca0000
0x00000003 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x00000004 0x00: eax=0x3c004121 ebx=0x01c0003f ecx=0x0000003f
edx=0x00000000
0x00000004 0x01: eax=0x3c004122 ebx=0x00c0003f ecx=0x0000007f
edx=0x00000000
0x00000004 0x02: eax=0x3c004143 ebx=0x01c0003f ecx=0x000001ff
edx=0x00000000
0x00000004 0x03: eax=0x3c07c163 ebx=0x03c0003f ecx=0x00002fff
edx=0x00000002
0x00000005 0x00: eax=0x00000040 ebx=0x00000040 ecx=0x00000003
edx=0x00001120
0x00000006 0x00: eax=0x00000007 ebx=0x00000002 ecx=0x00000009
edx=0x00000000
0x00000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x9c000000
0x00000008 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x00000009 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x0000000a 0x00: eax=0x07300403 ebx=0x00000004 ecx=0x00000000
edx=0x00000603
0x0000000b 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000004
0x0000000b 0x01: eax=0x00000005 ebx=0x0000000c ecx=0x00000201
edx=0x00000004
0x80000000 0x00: eax=0x80000008 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80000001 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000001
edx=0x2c100800
0x80000002 0x00: eax=0x65746e49 ebx=0x2952286c ecx=0x6f655820
edx=0x2952286e
0x80000003 0x00: eax=0x55504320 ebx=0x20202020 ecx=0x20202020
edx=0x58202020
0x80000004 0x00: eax=0x35373635 ebx=0x20402020 ecx=0x37302e33
edx=0x007a4847
0x80000005 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80000006 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x01006040
edx=0x00000000
0x80000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000100
0x80000008 0x00: eax=0x00003028 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80860000 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000004
0xc0000000 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000004
CPU 3:
0x00000000 0x00: eax=0x0000000b ebx=0x756e6547 ecx=0x6c65746e
edx=0x49656e69
0x00000001 0x00: eax=0x000206c2 ebx=0x10200800 ecx=0x029ee3ff
edx=0xbfebfbff
0x00000002 0x00: eax=0x55035a01 ebx=0x00f0b0ff ecx=0x00000000
edx=0x00ca0000
0x00000003 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x00000004 0x00: eax=0x3c004121 ebx=0x01c0003f ecx=0x0000003f
edx=0x00000000
0x00000004 0x01: eax=0x3c004122 ebx=0x00c0003f ecx=0x0000007f
edx=0x00000000
0x00000004 0x02: eax=0x3c004143 ebx=0x01c0003f ecx=0x000001ff
edx=0x00000000
0x00000004 0x03: eax=0x3c07c163 ebx=0x03c0003f ecx=0x00002fff
edx=0x00000002
0x00000005 0x00: eax=0x00000040 ebx=0x00000040 ecx=0x00000003
edx=0x00001120
0x00000006 0x00: eax=0x00000007 ebx=0x00000002 ecx=0x00000009
edx=0x00000000
0x00000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x9c000000
0x00000008 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x00000009 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x0000000a 0x00: eax=0x07300403 ebx=0x00000004 ecx=0x00000000
edx=0x00000603
0x0000000b 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000010
0x0000000b 0x01: eax=0x00000005 ebx=0x0000000c ecx=0x00000201
edx=0x00000010
0x80000000 0x00: eax=0x80000008 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80000001 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000001
edx=0x2c100800
0x80000002 0x00: eax=0x65746e49 ebx=0x2952286c ecx=0x6f655820
edx=0x2952286e
0x80000003 0x00: eax=0x55504320 ebx=0x20202020 ecx=0x20202020
edx=0x58202020
0x80000004 0x00: eax=0x35373635 ebx=0x20402020 ecx=0x37302e33
edx=0x007a4847
0x80000005 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80000006 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x01006040
edx=0x00000000
0x80000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000100
0x80000008 0x00: eax=0x00003028 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80860000 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000010
0xc0000000 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
edx=0x00000010
Or if the formatting is annoying, http://paste.debian.net/plainh/728b0c36
Thanks,
Hans
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: SMT/Hyperthreading detection not always correct
2018-09-03 11:55 SMT/Hyperthreading detection not always correct Hans van Kranenburg
@ 2018-09-03 13:13 ` Jan Beulich
2018-09-03 13:24 ` Hans van Kranenburg
0 siblings, 1 reply; 5+ messages in thread
From: Jan Beulich @ 2018-09-03 13:13 UTC (permalink / raw)
To: Hans van Kranenburg; +Cc: xen-devel
>>> On 03.09.18 at 13:55, <hans@knorrie.org> wrote:
> I ran into the situation where I got this banner in the xl dmesg...
>
> (XEN) ***************************************************
> (XEN) Booted on L1TF-vulnerable hardware with SMT/Hyperthreading
> (XEN) enabled. Please assess your configuration and choose an
> (XEN) explicit 'smt=<bool>' setting. See XSA-273.
> (XEN) ***************************************************
>
> ...while hyperthreading is disabled in the bios settings.
>
> Some lines from the POST messages:
>
> ProLiant System BIOS - P68 (05/21/2018)
> [...]
> 2 Processor(s) detected, 12 total cores enabled, Hyperthreading is disabled
> Proc 1: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz
> Proc 2: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz
>
> More debug info below. See the thread '"Booted on L1TF-vulnerable
> hardware with SMT/Hyperthreading enabled" .. or not?' in xen-users for
> even more.
>
> Reaction from Andrew on xen-users thread: "Looks like Xen does have a
> bug identifying the topology. Hyperthreading is definitely off, but
> there is no MADT so information is probably being derived from the
> legacy MP table.For now, set smt=0 if you want to skip the warning, and
> can you email xen-devel with a bug report please? "
"There is no MADT information" could have been a hint to you that first
of all you need ...
> -# xl dmesg
> (XEN) parameter "placeholder" unknown!
> (XEN) Xen version 4.11.1-pre (Debian
> 4.11.1~pre+1.733450b39b-1~exp1~mxbp9+1) (hans@knorrie.org) (gcc (Debian
> 6.3.0-18+deb9u1) 6.3.0 20170516) debug=n Wed Aug 22 15:26:44 UTC 2018
> (XEN) Bootloader: GRUB 2.02~beta3-5
> (XEN) Command line: placeholder dom0_max_vcpus=4 dom0_mem=4G,max:4G
> com2=115200,8n1 console=com2,vga noreboot xpti=no-dom0 cpuinfo
> dom0_vcpus_pin
... "loglvl=all" added so we can see all relevant information. In
particular ...
> (XEN) ACPI: RSDP 000F4F00, 0024 (r2 HP )
> (XEN) ACPI: XSDT D7630140, 00B4 (r1 HP ProLiant 2 162E)
> (XEN) ACPI: FACP D7630240, 00F4 (r3 HP ProLiant 2 162E)
> (XEN) ACPI: DSDT D7630340, 20BD (r1 HP DSDT 1 INTL 20030228)
> (XEN) ACPI: FACS D762F100, 0040
> (XEN) ACPI: SPCR D762F140, 0050 (r1 HP SPCRRBSU 1 162E)
> (XEN) ACPI: MCFG D762F1C0, 003C (r1 HP ProLiant 1 0)
> (XEN) ACPI: HPET D762F200, 0038 (r1 HP ProLiant 2 162E)
> (XEN) ACPI: FFFF D762F240, 0064 (r2 HP ProLiant 2 162E)
> (XEN) ACPI: SPMI D762F2C0, 0040 (r5 HP ProLiant 1 162E)
> (XEN) ACPI: ERST D762F300, 01D0 (r1 HP ProLiant 1 162E)
> (XEN) ACPI: APIC D762F500, 015E (r1 HP ProLiant 2 0)
> (XEN) ACPI: SRAT D762F680, 0570 (r1 HP Proliant 1 162E)
> (XEN) ACPI: FFFF D762FC00, 0176 (r1 HP ProLiant 1 162E)
> (XEN) ACPI: BERT D762FD80, 0030 (r1 HP ProLiant 1 162E)
> (XEN) ACPI: HEST D762FDC0, 00BC (r1 HP ProLiant 1 162E)
> (XEN) ACPI: DMAR D762FE80, 0146 (r1 HP ProLiant 1 162E)
> (XEN) ACPI: SSDT D7632400, 0125 (r3 HP CRSPCI0 2 HP 1)
> (XEN) ACPI: SSDT D7632540, 01CF (r3 HP riser1a 2 INTL 20061109)
> (XEN) ACPI: SSDT D7632740, 03BB (r1 HP pcc 1 INTL 20090625)
> (XEN) ACPI: SSDT D7632B00, 0377 (r1 HP pmab 1 INTL 20090625)
> (XEN) ACPI: SSDT D7632E80, 2094 (r1 INTEL PPM RCM 1 INTL 20061109)
... this demonstrates that ACPI is available, and I very much
hope your system isn't as screwed as there not being a MADT
available despite all the other ACPI tables being present.
> (XEN) IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23
> (XEN) IOAPIC[1]: apic_id 0, version 32, address 0xfec80000, GSI 24-47
FAOD - these two messages do not indicate presence of absence
of MADT.
> -# cpuid -r
> CPU 0:
> CPU 0:
> 0x00000000 0x00: eax=0x0000000b ebx=0x756e6547 ecx=0x6c65746e
> edx=0x49656e69
> 0x00000001 0x00: eax=0x000206c2 ebx=0x00200800 ecx=0x029ee3ff
> edx=0xbfebfbff
The HTT bit is 1 here (and EBX[23:16] is 0x20).
>[...]
> 0x00000004 0x00: eax=0x3c004121 ebx=0x01c0003f ecx=0x0000003f
> edx=0x00000000
EAX[31:26]=0x0f
i.e. 4 siblings as per the "old" detection method.
>[...]
> 0x0000000b 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
> edx=0x00000000
EBX here tells us that the thread part of the APIC ID is two bits. This
makes us record "up to 4 threads per core", independent of the HTT flag
(which, as per above, is set anyway, and would have produced the
same result).
I wonder what exactly the BIOS does in order to report "Hyperthreading
is disabled".
Jan
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: SMT/Hyperthreading detection not always correct
2018-09-03 13:13 ` Jan Beulich
@ 2018-09-03 13:24 ` Hans van Kranenburg
2018-09-03 13:35 ` Jan Beulich
0 siblings, 1 reply; 5+ messages in thread
From: Hans van Kranenburg @ 2018-09-03 13:24 UTC (permalink / raw)
To: Jan Beulich; +Cc: xen-devel
On 09/03/2018 03:13 PM, Jan Beulich wrote:
>>>> On 03.09.18 at 13:55, <hans@knorrie.org> wrote:
>> I ran into the situation where I got this banner in the xl dmesg...
>>
>> (XEN) ***************************************************
>> (XEN) Booted on L1TF-vulnerable hardware with SMT/Hyperthreading
>> (XEN) enabled. Please assess your configuration and choose an
>> (XEN) explicit 'smt=<bool>' setting. See XSA-273.
>> (XEN) ***************************************************
>>
>> ...while hyperthreading is disabled in the bios settings.
>>
>> Some lines from the POST messages:
>>
>> ProLiant System BIOS - P68 (05/21/2018)
>> [...]
>> 2 Processor(s) detected, 12 total cores enabled, Hyperthreading is disabled
>> Proc 1: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz
>> Proc 2: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz
>>
>> More debug info below. See the thread '"Booted on L1TF-vulnerable
>> hardware with SMT/Hyperthreading enabled" .. or not?' in xen-users for
>> even more.
>>
>> Reaction from Andrew on xen-users thread: "Looks like Xen does have a
>> bug identifying the topology. Hyperthreading is definitely off, but
>> there is no MADT so information is probably being derived from the
>> legacy MP table.For now, set smt=0 if you want to skip the warning, and
>> can you email xen-devel with a bug report please? "
>
> "There is no MADT information" could have been a hint to you that first
> of all you need ...
>
>> -# xl dmesg
>> (XEN) parameter "placeholder" unknown!
>> (XEN) Xen version 4.11.1-pre (Debian
>> 4.11.1~pre+1.733450b39b-1~exp1~mxbp9+1) (hans@knorrie.org) (gcc (Debian
>> 6.3.0-18+deb9u1) 6.3.0 20170516) debug=n Wed Aug 22 15:26:44 UTC 2018
>> (XEN) Bootloader: GRUB 2.02~beta3-5
>> (XEN) Command line: placeholder dom0_max_vcpus=4 dom0_mem=4G,max:4G
>> com2=115200,8n1 console=com2,vga noreboot xpti=no-dom0 cpuinfo
>> dom0_vcpus_pin
>
> ... "loglvl=all" added so we can see all relevant information. In
> particular ...
>
>> (XEN) ACPI: RSDP 000F4F00, 0024 (r2 HP )
>> (XEN) ACPI: XSDT D7630140, 00B4 (r1 HP ProLiant 2 162E)
>> (XEN) ACPI: FACP D7630240, 00F4 (r3 HP ProLiant 2 162E)
>> (XEN) ACPI: DSDT D7630340, 20BD (r1 HP DSDT 1 INTL 20030228)
>> (XEN) ACPI: FACS D762F100, 0040
>> (XEN) ACPI: SPCR D762F140, 0050 (r1 HP SPCRRBSU 1 162E)
>> (XEN) ACPI: MCFG D762F1C0, 003C (r1 HP ProLiant 1 0)
>> (XEN) ACPI: HPET D762F200, 0038 (r1 HP ProLiant 2 162E)
>> (XEN) ACPI: FFFF D762F240, 0064 (r2 HP ProLiant 2 162E)
>> (XEN) ACPI: SPMI D762F2C0, 0040 (r5 HP ProLiant 1 162E)
>> (XEN) ACPI: ERST D762F300, 01D0 (r1 HP ProLiant 1 162E)
>> (XEN) ACPI: APIC D762F500, 015E (r1 HP ProLiant 2 0)
>> (XEN) ACPI: SRAT D762F680, 0570 (r1 HP Proliant 1 162E)
>> (XEN) ACPI: FFFF D762FC00, 0176 (r1 HP ProLiant 1 162E)
>> (XEN) ACPI: BERT D762FD80, 0030 (r1 HP ProLiant 1 162E)
>> (XEN) ACPI: HEST D762FDC0, 00BC (r1 HP ProLiant 1 162E)
>> (XEN) ACPI: DMAR D762FE80, 0146 (r1 HP ProLiant 1 162E)
>> (XEN) ACPI: SSDT D7632400, 0125 (r3 HP CRSPCI0 2 HP 1)
>> (XEN) ACPI: SSDT D7632540, 01CF (r3 HP riser1a 2 INTL 20061109)
>> (XEN) ACPI: SSDT D7632740, 03BB (r1 HP pcc 1 INTL 20090625)
>> (XEN) ACPI: SSDT D7632B00, 0377 (r1 HP pmab 1 INTL 20090625)
>> (XEN) ACPI: SSDT D7632E80, 2094 (r1 INTEL PPM RCM 1 INTL 20061109)
>
> ... this demonstrates that ACPI is available, and I very much
> hope your system isn't as screwed as there not being a MADT
> available despite all the other ACPI tables being present.
Now with loglvl=all:
-# xl dmesg
(XEN) parameter "placeholder" unknown!
(XEN) Xen version 4.11.1-pre (Debian
4.11.1~pre+1.733450b39b-1~exp1~mxbp9+1) (hans@knorrie.org) (gcc (Debian
6.3.0-18+deb9u1) 6.3.0 20170516) debug=n Wed Aug 22 15:26:44 UTC 2018
(XEN) Bootloader: GRUB 2.02~beta3-5
(XEN) Command line: placeholder dom0_max_vcpus=4 dom0_mem=4G,max:4G
com2=115200,8n1 console=com2,vga noreboot xpti=no-dom0 cpuinfo
dom0_vcpus_pin loglvl=all
(XEN) Xen image load base address: 0
(XEN) Video information:
(XEN) VGA is text mode 80x25, font 8x16
(XEN) VBE/DDC methods: none; EDID transfer time: 2 seconds
(XEN) EDID info not retrieved because no DDC retrieval method detected
(XEN) Disc information:
(XEN) Found 1 MBR signatures
(XEN) Found 1 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN) 0000000000000000 - 000000000009f400 (usable)
(XEN) 000000000009f400 - 00000000000a0000 (reserved)
(XEN) 00000000000f0000 - 0000000000100000 (reserved)
(XEN) 0000000000100000 - 00000000d762f000 (usable)
(XEN) 00000000d762f000 - 00000000d763c000 (ACPI data)
(XEN) 00000000d763c000 - 00000000d763d000 (usable)
(XEN) 00000000d763d000 - 00000000dc000000 (reserved)
(XEN) 00000000fec00000 - 00000000fee10000 (reserved)
(XEN) 00000000ff800000 - 0000000100000000 (reserved)
(XEN) 0000000100000000 - 0000001b27fff000 (usable)
(XEN) New Xen image base address: 0xd7000000
(XEN) ACPI: RSDP 000F4F00, 0024 (r2 HP )
(XEN) ACPI: XSDT D7630140, 00B4 (r1 HP ProLiant 2 �\x04 162E)
(XEN) ACPI: FACP D7630240, 00F4 (r3 HP ProLiant 2 �\x04 162E)
(XEN) ACPI: DSDT D7630340, 20BD (r1 HP DSDT 1 INTL 20030228)
(XEN) ACPI: FACS D762F100, 0040
(XEN) ACPI: SPCR D762F140, 0050 (r1 HP SPCRRBSU 1 �\x04 162E)
(XEN) ACPI: MCFG D762F1C0, 003C (r1 HP ProLiant 1 0)
(XEN) ACPI: HPET D762F200, 0038 (r1 HP ProLiant 2 �\x04 162E)
(XEN) ACPI: FFFF D762F240, 0064 (r2 HP ProLiant 2 �\x04 162E)
(XEN) ACPI: SPMI D762F2C0, 0040 (r5 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: ERST D762F300, 01D0 (r1 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: APIC D762F500, 015E (r1 HP ProLiant 2 0)
(XEN) ACPI: SRAT D762F680, 0570 (r1 HP Proliant 1 �\x04 162E)
(XEN) ACPI: FFFF D762FC00, 0176 (r1 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: BERT D762FD80, 0030 (r1 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: HEST D762FDC0, 00BC (r1 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: DMAR D762FE80, 0146 (r1 HP ProLiant 1 �\x04 162E)
(XEN) ACPI: SSDT D7632400, 0125 (r3 HP CRSPCI0 2 HP 1)
(XEN) ACPI: SSDT D7632540, 01CF (r3 HP riser1a 2 INTL 20061109)
(XEN) ACPI: SSDT D7632740, 03BB (r1 HP pcc 1 INTL 20090625)
(XEN) ACPI: SSDT D7632B00, 0377 (r1 HP pmab 1 INTL 20090625)
(XEN) ACPI: SSDT D7632E80, 2094 (r1 INTEL PPM RCM 1 INTL 20061109)
(XEN) System RAM: 110581MB (113235768kB)
(XEN) SRAT: PXM 0 -> APIC 00 -> Node 0
(XEN) SRAT: PXM 0 -> APIC 02 -> Node 0
(XEN) SRAT: PXM 0 -> APIC 04 -> Node 0
(XEN) SRAT: PXM 0 -> APIC 10 -> Node 0
(XEN) SRAT: PXM 0 -> APIC 12 -> Node 0
(XEN) SRAT: PXM 0 -> APIC 14 -> Node 0
(XEN) SRAT: PXM 1 -> APIC 20 -> Node 1
(XEN) SRAT: PXM 1 -> APIC 22 -> Node 1
(XEN) SRAT: PXM 1 -> APIC 24 -> Node 1
(XEN) SRAT: PXM 1 -> APIC 30 -> Node 1
(XEN) SRAT: PXM 1 -> APIC 32 -> Node 1
(XEN) SRAT: PXM 1 -> APIC 34 -> Node 1
(XEN) SRAT: Node 0 PXM 0 0-d8000000
(XEN) SRAT: Node 0 PXM 0 100000000-da8000000
(XEN) SRAT: Node 1 PXM 1 da8000000-1b28000000
(XEN) NUMA: Allocated memnodemap from 1b27ef9000 - 1b27efa000
(XEN) NUMA: Using 15 for the hash shift.
(XEN) Domain heap initialised DMA width 32 bits
(XEN) CPU Vendor: Intel, Family 6 (0x6), Model 44 (0x2c), Stepping 2
(raw 000206c2)
(XEN) found SMP MP-table at 000f4f80
(XEN) DMI 2.7 present.
(XEN) Using APIC driver default
(XEN) ACPI: PM-Timer IO Port: 0x908 (32 bits)
(XEN) ACPI: SLEEP INFO: pm1x_cnt[1:904,1:0], pm1x_evt[1:900,1:0]
(XEN) ACPI: wakeup_vec[d762f10c], vec_size[20]
(XEN) ACPI: Local APIC address 0xfee00000
(XEN) ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x10] lapic_id[0x20] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x08] lapic_id[0x10] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x18] lapic_id[0x30] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x04] lapic_id[0x04] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x14] lapic_id[0x24] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x0c] lapic_id[0x14] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x1c] lapic_id[0x34] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x12] lapic_id[0x22] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x0a] lapic_id[0x12] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x1a] lapic_id[0x32] enabled)
(XEN) ACPI: LAPIC (acpi_id[0x06] lapic_id[0x06] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x16] lapic_id[0x26] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x0e] lapic_id[0x16] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x1e] lapic_id[0x36] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x11] lapic_id[0x21] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x09] lapic_id[0x11] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x19] lapic_id[0x31] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x05] lapic_id[0x05] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x15] lapic_id[0x25] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x0d] lapic_id[0x15] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x1d] lapic_id[0x35] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x13] lapic_id[0x23] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x0b] lapic_id[0x13] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x1b] lapic_id[0x33] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x07] lapic_id[0x07] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x17] lapic_id[0x27] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x0f] lapic_id[0x17] disabled)
(XEN) ACPI: LAPIC (acpi_id[0x1f] lapic_id[0x37] disabled)
(XEN) ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
(XEN) Overriding APIC driver with bigsmp
(XEN) ACPI: IOAPIC (id[0x08] address[0xfec00000] gsi_base[0])
(XEN) IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23
(XEN) ACPI: IOAPIC (id[0x00] address[0xfec80000] gsi_base[24])
(XEN) IOAPIC[1]: apic_id 0, version 32, address 0xfec80000, GSI 24-47
(XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 high edge)
(XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
(XEN) ACPI: IRQ0 used by override.
(XEN) ACPI: IRQ2 used by override.
(XEN) ACPI: IRQ9 used by override.
(XEN) Enabling APIC mode: Phys. Using 2 I/O APICs
(XEN) ACPI: HPET id: 0x8086a201 base: 0xfed00000
(XEN) Failed to get Error Log Address Range.
(XEN) HEST: Table parsing has been initialized
(XEN) Using ACPI (MADT) for SMP configuration information
(XEN) SMP: Allowing 32 CPUs (20 hotplug CPUs)
(XEN) IRQ limits: 48 GSI, 2272 MSI/MSI-X
(XEN) Levelling caps: 0x1e
(XEN) MSR defaults: 1d 0xbfebfbff, 1c 0x029ee3ff, e1d 0x2c100800, e1c
0x00000001, Da1 0x00000000
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 0
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU0: Thermal monitoring enabled (TM1)
(XEN) CPU0: Intel machine check reporting enabled
(XEN) Speculative mitigation facilities:
(XEN) Hardware features: IBRS/IBPB STIBP L1D_FLUSH SSBD
(XEN) Compiled-in support: INDIRECT_THUNK SHADOW_PAGING
(XEN) Xen settings: BTI-Thunk RETPOLINE, SPEC_CTRL: IBRS- SSBD-,
Other: IBPB L1D_FLUSH
(XEN) L1TF: believed vulnerable, maxphysaddr L1D 44, CPUID 40, Safe
address 10000000000
(XEN) Support for VMs: PV: MSR_SPEC_CTRL RSB EAGER_FPU, HVM:
MSR_SPEC_CTRL RSB EAGER_FPU
(XEN) XPTI (64-bit PV only): Dom0 disabled, DomU disabled
(XEN) PV L1TF shadowing: Dom0 disabled, DomU enabled
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Initializing CPU#0
(XEN) Platform timer is 14.318MHz HPET
(XEN) Detected 3066.789 MHz processor.
(XEN) Initing memory sharing.
(XEN) alt table ffff82d0804287f8 -> ffff82d08042a58e
(XEN) PCI: MCFG configuration 0: base d8000000 segment 0000 buses 00 - 3f
(XEN) PCI: MCFG area at d8000000 reserved in E820
(XEN) PCI: Using MCFG for segment 0000 bus 00-3f
(XEN) [VT-D]Disabling IOMMU due to Intel 5500/5520/X58 Chipset errata
#47, #53
(XEN) I/O virtualisation disabled
(XEN) CPU0: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) nr_sockets: 3
(XEN) Enabled directed EOI with ioapic_ack_old on!
(XEN) ENABLING IO-APIC IRQs
(XEN) -> Using old ACK method
(XEN) ..TIMER: vector=0xF0 apic1=0 pin1=2 apic2=-1 pin2=-1
(XEN) Allocated console ring of 128 KiB.
(XEN) mwait-idle: MWAIT substates: 0x1120
(XEN) mwait-idle: v0.4.1 model 0x2c
(XEN) mwait-idle: lapic_timer_reliable_states 0xffffffff
(XEN) VMX: Supported advanced features:
(XEN) - APIC MMIO access virtualisation
(XEN) - APIC TPR shadow
(XEN) - Extended Page Tables (EPT)
(XEN) - Virtual-Processor Identifiers (VPID)
(XEN) - Virtual NMI
(XEN) - MSR direct-access bitmap
(XEN) - Unrestricted Guest
(XEN) HVM: ASIDs enabled.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging (HAP) detected
(XEN) HVM: HAP page sizes: 4kB, 2MB, 1GB
(XEN) CPU 0 APIC 0 -> Node 0
(XEN) CPU 1 APIC 2 -> Node 0
(XEN) Booting processor 1/2 eip 8f000
(XEN) Initializing CPU#1
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 1
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU1: Thermal monitoring enabled (TM1)
(XEN) CPU1: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 2 APIC 4 -> Node 0
(XEN) Booting processor 2/4 eip 8f000
(XEN) Initializing CPU#2
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 2
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU2: Thermal monitoring enabled (TM1)
(XEN) CPU2: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 3 APIC 16 -> Node 0
(XEN) Booting processor 3/16 eip 8f000
(XEN) Initializing CPU#3
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 8
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU3: Thermal monitoring enabled (TM1)
(XEN) CPU3: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 4 APIC 18 -> Node 0
(XEN) Booting processor 4/18 eip 8f000
(XEN) Initializing CPU#4
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 9
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU4: Thermal monitoring enabled (TM1)
(XEN) CPU4: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 5 APIC 20 -> Node 0
(XEN) Booting processor 5/20 eip 8f000
(XEN) Initializing CPU#5
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU: Processor Core ID: 10
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU5: Thermal monitoring enabled (TM1)
(XEN) CPU5: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 6 APIC 32 -> Node 1
(XEN) Booting processor 6/32 eip 8f000
(XEN) Initializing CPU#6
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 0
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU6: Thermal monitoring enabled (TM1)
(XEN) CPU6: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 7 APIC 34 -> Node 1
(XEN) Booting processor 7/34 eip 8f000
(XEN) Initializing CPU#7
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 1
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU7: Thermal monitoring enabled (TM1)
(XEN) CPU7: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 8 APIC 36 -> Node 1
(XEN) Booting processor 8/36 eip 8f000
(XEN) Initializing CPU#8
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 2
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU8: Thermal monitoring enabled (TM1)
(XEN) CPU8: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 9 APIC 48 -> Node 1
(XEN) Booting processor 9/48 eip 8f000
(XEN) Initializing CPU#9
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 8
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU9: Thermal monitoring enabled (TM1)
(XEN) CPU9: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 10 APIC 50 -> Node 1
(XEN) Booting processor 10/50 eip 8f000
(XEN) Initializing CPU#10
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 9
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU10: Thermal monitoring enabled (TM1)
(XEN) CPU10: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) CPU 11 APIC 52 -> Node 1
(XEN) Booting processor 11/52 eip 8f000
(XEN) Initializing CPU#11
(XEN) CPU: Physical Processor ID: 1
(XEN) CPU: Processor Core ID: 10
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 12288K
(XEN) CPU11: Thermal monitoring enabled (TM1)
(XEN) CPU11: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping 02
(XEN) Brought up 12 CPUs
(XEN) build-id: 608b6c7506b39944b62cdec31cbf5006614ed9ba
(XEN) ACPI sleep modes: S3
(XEN) VPMU: disabled
(XEN) mcheck_poll: Machine check polling timer started.
(XEN) Dom0 has maximum 816 PIRQs
(XEN) NX (Execute Disable) protection active
(XEN) *** Building a PV Dom0 ***
(XEN) Xen kernel: 64-bit, lsb, compat32
(XEN) Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x266a000
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN) Dom0 alloc.: 0000000d98000000->0000000d9c000000 (1025804 pages
to be allocated)
(XEN) Init. ramdisk: 0000001b2650c000->0000001b27dffa74
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN) Loaded kernel: ffffffff81000000->ffffffff8266a000
(XEN) Init. ramdisk: 0000000000000000->0000000000000000
(XEN) Phys-Mach map: 0000008000000000->0000008000800000
(XEN) Start info: ffffffff8266a000->ffffffff8266a4b4
(XEN) Xenstore ring: 0000000000000000->0000000000000000
(XEN) Console ring: 0000000000000000->0000000000000000
(XEN) Page tables: ffffffff8266b000->ffffffff82682000
(XEN) Boot stack: ffffffff82682000->ffffffff82683000
(XEN) TOTAL: ffffffff80000000->ffffffff82800000
(XEN) ENTRY ADDRESS: ffffffff82433180
(XEN) Dom0 has maximum 4 VCPUs
(XEN) Initial low memory virq threshold set at 0x4000 pages.
(XEN) Scrubbing Free RAM on 2 nodes using 12 CPUs
(XEN)
.........................................................................done.
(XEN) Std. Loglevel: All
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
(XEN) ***************************************************
(XEN) Booted on L1TF-vulnerable hardware with SMT/Hyperthreading
(XEN) enabled. Please assess your configuration and choose an
(XEN) explicit 'smt=<bool>' setting. See XSA-273.
(XEN) ***************************************************
(XEN) 3... 2... 1...
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
input to Xen)
(XEN) Freed 476kB init memory
(XEN) PCI add device 0000:00:00.0
(XEN) PCI add device 0000:00:01.0
(XEN) PCI add device 0000:00:02.0
(XEN) PCI add device 0000:00:03.0
(XEN) PCI add device 0000:00:04.0
(XEN) PCI add device 0000:00:05.0
(XEN) PCI add device 0000:00:06.0
(XEN) PCI add device 0000:00:07.0
(XEN) PCI add device 0000:00:08.0
(XEN) PCI add device 0000:00:09.0
(XEN) PCI add device 0000:00:0a.0
(XEN) PCI add device 0000:00:0d.0
(XEN) PCI add device 0000:00:0d.1
(XEN) PCI add device 0000:00:0d.2
(XEN) PCI add device 0000:00:0d.3
(XEN) PCI add device 0000:00:0d.4
(XEN) PCI add device 0000:00:0d.5
(XEN) PCI add device 0000:00:0d.6
(XEN) PCI add device 0000:00:0e.0
(XEN) PCI add device 0000:00:0e.1
(XEN) PCI add device 0000:00:0e.2
(XEN) PCI add device 0000:00:0e.3
(XEN) PCI add device 0000:00:0e.4
(XEN) PCI add device 0000:00:14.0
(XEN) PCI add device 0000:00:14.1
(XEN) PCI add device 0000:00:14.2
(XEN) PCI add device 0000:00:1c.0
(XEN) PCI add device 0000:00:1c.4
(XEN) PCI add device 0000:00:1d.0
(XEN) PCI add device 0000:00:1d.1
(XEN) PCI add device 0000:00:1d.2
(XEN) PCI add device 0000:00:1d.3
(XEN) PCI add device 0000:00:1d.7
(XEN) PCI add device 0000:00:1e.0
(XEN) PCI add device 0000:00:1f.0
(XEN) PCI add device 0000:05:00.0
(XEN) PCI add device 0000:09:00.0
(XEN) PCI add device 0000:03:00.0
(XEN) PCI add device 0000:03:00.1
(XEN) PCI add device 0000:04:00.0
(XEN) PCI add device 0000:04:00.1
(XEN) PCI add device 0000:02:00.0
(XEN) PCI add device 0000:02:00.2
(XEN) PCI add device 0000:02:00.4
(XEN) PCI add device 0000:01:03.0
(XEN) PCI add device 0000:3e:00.0
(XEN) PCI add device 0000:3e:00.1
(XEN) PCI add device 0000:3e:02.0
(XEN) PCI add device 0000:3e:02.1
(XEN) PCI add device 0000:3e:02.2
(XEN) PCI add device 0000:3e:02.3
(XEN) PCI add device 0000:3e:02.4
(XEN) PCI add device 0000:3e:02.5
(XEN) PCI add device 0000:3e:03.0
(XEN) PCI add device 0000:3e:03.1
(XEN) PCI add device 0000:3e:03.2
(XEN) PCI add device 0000:3e:03.4
(XEN) PCI add device 0000:3e:04.0
(XEN) PCI add device 0000:3e:04.1
(XEN) PCI add device 0000:3e:04.2
(XEN) PCI add device 0000:3e:04.3
(XEN) PCI add device 0000:3e:05.0
(XEN) PCI add device 0000:3e:05.1
(XEN) PCI add device 0000:3e:05.2
(XEN) PCI add device 0000:3e:05.3
(XEN) PCI add device 0000:3e:06.0
(XEN) PCI add device 0000:3e:06.1
(XEN) PCI add device 0000:3e:06.2
(XEN) PCI add device 0000:3e:06.3
(XEN) PCI add device 0000:3f:00.0
(XEN) PCI add device 0000:3f:00.1
(XEN) PCI add device 0000:3f:02.0
(XEN) PCI add device 0000:3f:02.1
(XEN) PCI add device 0000:3f:02.2
(XEN) PCI add device 0000:3f:02.3
(XEN) PCI add device 0000:3f:02.4
(XEN) PCI add device 0000:3f:02.5
(XEN) PCI add device 0000:3f:03.0
(XEN) PCI add device 0000:3f:03.1
(XEN) PCI add device 0000:3f:03.2
(XEN) PCI add device 0000:3f:03.4
(XEN) PCI add device 0000:3f:04.0
(XEN) PCI add device 0000:3f:04.1
(XEN) PCI add device 0000:3f:04.2
(XEN) PCI add device 0000:3f:04.3
(XEN) PCI add device 0000:3f:05.0
(XEN) PCI add device 0000:3f:05.1
(XEN) PCI add device 0000:3f:05.2
(XEN) PCI add device 0000:3f:05.3
(XEN) PCI add device 0000:3f:06.0
(XEN) PCI add device 0000:3f:06.1
(XEN) PCI add device 0000:3f:06.2
(XEN) PCI add device 0000:3f:06.3
>> (XEN) IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23
>> (XEN) IOAPIC[1]: apic_id 0, version 32, address 0xfec80000, GSI 24-47
>
> FAOD - these two messages do not indicate presence of absence
> of MADT.
>
>> -# cpuid -r
>> CPU 0:
>> CPU 0:
>> 0x00000000 0x00: eax=0x0000000b ebx=0x756e6547 ecx=0x6c65746e
>> edx=0x49656e69
>> 0x00000001 0x00: eax=0x000206c2 ebx=0x00200800 ecx=0x029ee3ff
>> edx=0xbfebfbff
>
> The HTT bit is 1 here (and EBX[23:16] is 0x20).
>
>> [...]
>> 0x00000004 0x00: eax=0x3c004121 ebx=0x01c0003f ecx=0x0000003f
>> edx=0x00000000
>
> EAX[31:26]=0x0f
>
> i.e. 4 siblings as per the "old" detection method.
>
>> [...]
>> 0x0000000b 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100
>> edx=0x00000000
>
> EBX here tells us that the thread part of the APIC ID is two bits. This
> makes us record "up to 4 threads per core", independent of the HTT flag
> (which, as per above, is set anyway, and would have produced the
> same result).
>
> I wonder what exactly the BIOS does in order to report "Hyperthreading
> is disabled".
Thanks,
Hans
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: SMT/Hyperthreading detection not always correct
2018-09-03 13:24 ` Hans van Kranenburg
@ 2018-09-03 13:35 ` Jan Beulich
2018-09-03 14:52 ` Hans van Kranenburg
0 siblings, 1 reply; 5+ messages in thread
From: Jan Beulich @ 2018-09-03 13:35 UTC (permalink / raw)
To: Hans van Kranenburg; +Cc: xen-devel
>>> On 03.09.18 at 15:24, <hans@knorrie.org> wrote:
> (XEN) ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x10] lapic_id[0x20] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x08] lapic_id[0x10] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x18] lapic_id[0x30] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x04] lapic_id[0x04] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x14] lapic_id[0x24] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x0c] lapic_id[0x14] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x1c] lapic_id[0x34] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x12] lapic_id[0x22] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x0a] lapic_id[0x12] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x1a] lapic_id[0x32] enabled)
> (XEN) ACPI: LAPIC (acpi_id[0x06] lapic_id[0x06] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x16] lapic_id[0x26] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x0e] lapic_id[0x16] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x1e] lapic_id[0x36] disabled)
These look to be all the primary threads, the last few disabled due
to being absent.
> (XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x11] lapic_id[0x21] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x09] lapic_id[0x11] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x19] lapic_id[0x31] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x05] lapic_id[0x05] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x15] lapic_id[0x25] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x0d] lapic_id[0x15] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x1d] lapic_id[0x35] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x13] lapic_id[0x23] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x0b] lapic_id[0x13] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x1b] lapic_id[0x33] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x07] lapic_id[0x07] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x17] lapic_id[0x27] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x0f] lapic_id[0x17] disabled)
> (XEN) ACPI: LAPIC (acpi_id[0x1f] lapic_id[0x37] disabled)
And these are all the secondary threads afaict, which are all
disabled. I'm unconvinced we can assume a system is not using
hyperthreading simply based upon their MADT entries showing all
of them as disabled - what if a HT-enabled CPU was later
hotplugged?
I would have hoped that the topology related CPUID output
would change when HT is (properly) disabled by the BIOS.
For the moment I can't see a way around you specifying "smt=0"
on systems like this one.
Jan
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: SMT/Hyperthreading detection not always correct
2018-09-03 13:35 ` Jan Beulich
@ 2018-09-03 14:52 ` Hans van Kranenburg
0 siblings, 0 replies; 5+ messages in thread
From: Hans van Kranenburg @ 2018-09-03 14:52 UTC (permalink / raw)
To: Jan Beulich; +Cc: xen-devel
On 09/03/2018 03:35 PM, Jan Beulich wrote:
>>>> On 03.09.18 at 15:24, <hans@knorrie.org> wrote:
>> (XEN) ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x10] lapic_id[0x20] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x08] lapic_id[0x10] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x18] lapic_id[0x30] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x04] lapic_id[0x04] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x14] lapic_id[0x24] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x0c] lapic_id[0x14] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x1c] lapic_id[0x34] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x12] lapic_id[0x22] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x0a] lapic_id[0x12] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x1a] lapic_id[0x32] enabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x06] lapic_id[0x06] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x16] lapic_id[0x26] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x0e] lapic_id[0x16] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x1e] lapic_id[0x36] disabled)
>
> These look to be all the primary threads, the last few disabled due
> to being absent.
>
>> (XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x11] lapic_id[0x21] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x09] lapic_id[0x11] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x19] lapic_id[0x31] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x05] lapic_id[0x05] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x15] lapic_id[0x25] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x0d] lapic_id[0x15] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x1d] lapic_id[0x35] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x13] lapic_id[0x23] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x0b] lapic_id[0x13] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x1b] lapic_id[0x33] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x07] lapic_id[0x07] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x17] lapic_id[0x27] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x0f] lapic_id[0x17] disabled)
>> (XEN) ACPI: LAPIC (acpi_id[0x1f] lapic_id[0x37] disabled)
>
> And these are all the secondary threads afaict, which are all
> disabled. I'm unconvinced we can assume a system is not using
> hyperthreading simply based upon their MADT entries showing all
> of them as disabled - what if a HT-enabled CPU was later
> hotplugged?
>
> I would have hoped that the topology related CPUID output
> would change when HT is (properly) disabled by the BIOS.
>
> For the moment I can't see a way around you specifying "smt=0"
> on systems like this one.
The actual reason why I started the conversation about it was that for a
regular end user, the message telling the user that he has "hardware
with SMT/Hyperthreading enabled" is a confusing thing if you just made
sure that you have it disabled in the settings.
So, alternatively, instead of a technical solution, the warning could be
changed to something like "Booted on L1TF-vulnerable hardware and unable
to properly detect if SMT/Hyperthreading is enabled or disabled....
Please choose explicit smt setting blah to make sure that it behaves how
you want."
As a user, that's less confusing, it just tells me that Xen likes me to
make explicit what I want.
Hans
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^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-09-03 14:52 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-09-03 11:55 SMT/Hyperthreading detection not always correct Hans van Kranenburg
2018-09-03 13:13 ` Jan Beulich
2018-09-03 13:24 ` Hans van Kranenburg
2018-09-03 13:35 ` Jan Beulich
2018-09-03 14:52 ` Hans van Kranenburg
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