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Date:	Fri, 21 Mar 2014 12:04:32 -0700
From:	Venkatesh Srinivas <venkateshs@...gle.com>
To:	Peter Wu <peter@...ensteyn.nl>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: GPF in intel_pmu_lbr_reset() with qemu -cpu host

On Fri, Mar 21, 2014 at 10:46 AM, Peter Wu <peter@...ensteyn.nl> wrote:
> cc'ing kvm people and list.
>
> On Friday 21 March 2014 18:42:40 Peter Wu wrote:
>> Hi,
>>
>> While trying to run QEMU with `-enable-kvm -host cpu`, I get a GPF in
>> intel_pmu_lbr_reset():
>>
>> [    0.024000] general protection fault: 0000 [#1]
>> [    0.024000] CPU: 0 PID: 1 Comm: swapper Not tainted 3.14.0-rc7-qemu-00059-g08edb33 #14
>> [    0.024000] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
>> [    0.024000] task: ffff88003e050000 ti: ffff88003e054000 task.ti: ffff88003e054000
>> [    0.024000] RIP: 0010:[<ffffffff8101148a>]  [<ffffffff8101148a>] intel_pmu_lbr_reset+0x2a/0x80
>> [    0.024000] RSP: 0000:ffff88003e055e78  EFLAGS: 00000002
>> [    0.024000] RAX: 0000000000000000 RBX: 0000000000000286 RCX: 0000000000000680
>> [    0.024000] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
>> [    0.024000] RBP: ffffffff81622120 R08: ffff88003ffee0e0 R09: ffff88003e00bf00
>> [    0.024000] R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000
>> [    0.024000] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>> [    0.024000] FS:  0000000000000000(0000) GS:ffffffff8161e000(0000) knlGS:0000000000000000
>> [    0.024000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [    0.024000] CR2: ffff8800019bb000 CR3: 0000000001611000 CR4: 00000000001407b0
>> [    0.024000] Stack:
>> [    0.024000]  ffffffff8101308a ffffffff8100e3da ffffffff8165ba62 0000000000000000
>> [    0.024000]  ffffffff8165b5bd 0000000000000000 0000000000000000 0000000000000000
>> [    0.024000]  ffffffff81655dcd 0000000000000000 0000000000000000 0000000000000000
>> [    0.024000] Call Trace:
>> [    0.024000]  [<ffffffff8101308a>] ? intel_pmu_cpu_starting+0xa/0x80
>> [    0.024000]  [<ffffffff8100e3da>] ? x86_pmu_notifier+0x5a/0xc0
>> [    0.024000]  [<ffffffff8165ba62>] ? init_hw_perf_events+0x4a5/0x4dd
>> [    0.024000]  [<ffffffff8165b5bd>] ? check_bugs+0x42/0x42
>> [    0.024000]  [<ffffffff81655dcd>] ? do_one_initcall+0x76/0xf9
>> [    0.024000]  [<ffffffff81276b70>] ? rest_init+0x70/0x70
>> [    0.024000]  [<ffffffff81655ea7>] ? kernel_init_freeable+0x57/0x177
>> [    0.024000]  [<ffffffff81276b70>] ? rest_init+0x70/0x70
>> [    0.024000]  [<ffffffff81276b75>] ? kernel_init+0x5/0xe0
>> [    0.024000]  [<ffffffff8128067a>] ? ret_from_fork+0x7a/0xb0
>> [    0.024000]  [<ffffffff81276b70>] ? rest_init+0x70/0x70
>> [    0.024000] Code: 00 8b 15 02 c4 63 00 85 d2 74 69 f6 05 af c3 63 00 3f 75 2d 85 d2 7e 5c 31 f6 31 c0 0f 1f 44 00 00 8b 0d d2 c3 63 00 89 c2 01 f1 <0f> 30 83 c6 01 3b 35 d3 c3 63 00 7c e9 f3 c3 0f 1f 80 00 00 00
>> [    0.024000] RIP  [<ffffffff8101148a>] intel_pmu_lbr_reset+0x2a/0x80
>> [    0.024000]  RSP <ffff88003e055e78>
>> [    0.024000] ---[ end trace ecbd794f78441b2c ]---
>> [    0.024002] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>>
>>
>> It possibly has something to do with the msr write. Reproducable with:
>>
>>     qemu-system-x86_64 -enable-kvm -cpu host -kernel bzImage -m 1G -serial file:ser.txt
>>
>> In the host dmesg, the following is visible when qemu:
>>
>>     kvm [4939]: vcpu0 unhandled wrmsr: 0x680 data 0
>>
>> The full guest dmesg is shown below. The issue occurs also with
>> v3.13.6, v3.12.14, v3.10.33 (other versions are not tested).
>>
>> QEMU: 1.7.0
>> Host kernel: v3.14-rc5
>> Guest kernel: v3.14-rc7-59-g08edb33 (.config on the bottom)
>>
>> Kind regards,
>> Peter
>>
>> ### dmesg
>> [    0.000000] Linux version 3.14.0-rc7-qemu-00059-g08edb33 (pc@...artica) (gcc version 4.8.2 (Ubuntu 4.8.2-16ubuntu6) ) #14 Fri Mar 21 17:30:49 CET 2014
>> [    0.000000] Command line: console=ttyS0 loglevel=8
>> [    0.000000] KERNEL supported cpus:
>> [    0.000000]   Intel GenuineIntel
>> [    0.000000] e820: BIOS-provided physical RAM map:
>> [    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
>> [    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
>> [    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
>> [    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000003fffdfff] usable
>> [    0.000000] BIOS-e820: [mem 0x000000003fffe000-0x000000003fffffff] reserved
>> [    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
>> [    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
>> [    0.000000] NX (Execute Disable) protection: active
>> [    0.000000] SMBIOS 2.4 present.
>> [    0.000000] DMI: Bochs Bochs, BIOS Bochs 01/01/2011
>> [    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
>> [    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
>> [    0.000000] e820: last_pfn = 0x3fffe max_arch_pfn = 0x400000000
>> [    0.000000] MTRR default type: write-back
>> [    0.000000] MTRR fixed ranges enabled:
>> [    0.000000]   00000-9FFFF write-back
>> [    0.000000]   A0000-BFFFF uncachable
>> [    0.000000]   C0000-FFFFF write-protect
>> [    0.000000] MTRR variable ranges enabled:
>> [    0.000000]   0 base 0080000000 mask FF80000000 uncachable
>> [    0.000000]   1 disabled
>> [    0.000000]   2 disabled
>> [    0.000000]   3 disabled
>> [    0.000000]   4 disabled
>> [    0.000000]   5 disabled
>> [    0.000000]   6 disabled
>> [    0.000000]   7 disabled
>> [    0.000000] x86 PAT enabled: cpu 0, old 0x70406, new 0x7010600070106
>> [    0.000000] found SMP MP-table at [mem 0x000f1b10-0x000f1b1f] mapped at [ffff8800000f1b10]
>> [    0.000000] Base memory trampoline at [ffff880000099000] 99000 size 24576
>> [    0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff]
>> [    0.000000]  [mem 0x00000000-0x000fffff] page 4k
>> [    0.000000] BRK [0x019bb000, 0x019bbfff] PGTABLE
>> [    0.000000] BRK [0x019bc000, 0x019bcfff] PGTABLE
>> [    0.000000] BRK [0x019bd000, 0x019bdfff] PGTABLE
>> [    0.000000] init_memory_mapping: [mem 0x3fc00000-0x3fdfffff]
>> [    0.000000]  [mem 0x3fc00000-0x3fdfffff] page 2M
>> [    0.000000] init_memory_mapping: [mem 0x3c000000-0x3fbfffff]
>> [    0.000000]  [mem 0x3c000000-0x3fbfffff] page 2M
>> [    0.000000] init_memory_mapping: [mem 0x00100000-0x3bffffff]
>> [    0.000000]  [mem 0x00100000-0x001fffff] page 4k
>> [    0.000000]  [mem 0x00200000-0x3bffffff] page 2M
>> [    0.000000] init_memory_mapping: [mem 0x3fe00000-0x3fffdfff]
>> [    0.000000]  [mem 0x3fe00000-0x3fffdfff] page 4k
>> [    0.000000] BRK [0x019be000, 0x019befff] PGTABLE
>> [    0.000000] ACPI: RSDP 00000000000f19b0 000014 (v00 BOCHS )
>> [    0.000000] ACPI: RSDT 000000003ffffad3 000034 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
>> [    0.000000] ACPI: FACP 000000003ffff177 000074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
>> [    0.000000] ACPI: DSDT 000000003fffe040 001137 (v01   BXPC   BXDSDT 00000001 INTL 20130823)
>> [    0.000000] ACPI: FACS 000000003fffe000 000040
>> [    0.000000] ACPI: SSDT 000000003ffff1eb 000838 (v01 BOCHS  BXPCSSDT 00000001 BXPC 00000001)
>> [    0.000000] ACPI: APIC 000000003ffffa23 000078 (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
>> [    0.000000] ACPI: HPET 000000003ffffa9b 000038 (v01 BOCHS  BXPCHPET 00000001 BXPC 00000001)
>> [    0.000000] ACPI: Local APIC address 0xfee00000
>> [    0.000000]  [ffffea0000000000-ffffea0000ffffff] PMD -> [ffff88003e600000-ffff88003f5fffff] on node 0
>> [    0.000000] Zone ranges:
>> [    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
>> [    0.000000]   DMA32    [mem 0x01000000-0xffffffff]
>> [    0.000000]   Normal   empty
>> [    0.000000] Movable zone start for each node
>> [    0.000000] Early memory node ranges
>> [    0.000000]   node   0: [mem 0x00001000-0x0009efff]
>> [    0.000000]   node   0: [mem 0x00100000-0x3fffdfff]
>> [    0.000000] On node 0 totalpages: 262044
>> [    0.000000]   DMA zone: 64 pages used for memmap
>> [    0.000000]   DMA zone: 21 pages reserved
>> [    0.000000]   DMA zone: 3998 pages, LIFO batch:0
>> [    0.000000]   DMA32 zone: 4032 pages used for memmap
>> [    0.000000]   DMA32 zone: 258046 pages, LIFO batch:31
>> [    0.000000] ACPI: PM-Timer IO Port: 0xb008
>> [    0.000000] ACPI: Local APIC address 0xfee00000
>> [    0.000000] ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
>> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
>> [    0.000000] ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
>> [    0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
>> [    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
>> [    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
>> [    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
>> [    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
>> [    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
>> [    0.000000] ACPI: IRQ0 used by override.
>> [    0.000000] ACPI: IRQ2 used by override.
>> [    0.000000] ACPI: IRQ5 used by override.
>> [    0.000000] ACPI: IRQ9 used by override.
>> [    0.000000] ACPI: IRQ10 used by override.
>> [    0.000000] ACPI: IRQ11 used by override.
>> [    0.000000] Using ACPI (MADT) for SMP configuration information
>> [    0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
>> [    0.000000] nr_irqs_gsi: 40
>> [    0.000000] e820: [mem 0x40000000-0xfeffbfff] available for PCI devices
>> [    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
>> [    0.000000] pcpu-alloc: [0] 0
>> [    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 257927
>> [    0.000000] Kernel command line: console=ttyS0 loglevel=8
>> [    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
>> [    0.000000] Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes)
>> [    0.000000] Inode-cache hash table entries: 65536 (order: 7, 524288 bytes)
>> [    0.000000] xsave: enabled xstate_bv 0x7, cntxt size 0x340
>> [    0.000000] Memory: 1020072K/1048176K available (2567K kernel code, 332K rwdata, 704K rodata, 3052K init, 424K bss, 28104K reserved)
>> [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
>> [    0.000000] NR_IRQS:4352 nr_irqs:256 16
>> [    0.000000] Console: colour VGA+ 80x25
>> [    0.000000] console [ttyS0] enabled
>> [    0.000000] hpet clockevent registered
>> [    0.000000] tsc: Fast TSC calibration using PIT
>> [    0.000000] tsc: Detected 3392.306 MHz processor
>> [    0.008008] Calibrating delay loop (skipped), value calculated using timer frequency.. 6784.61 BogoMIPS (lpj=13569224)
>> [    0.009740] pid_max: default: 32768 minimum: 301
>> [    0.010391] ACPI: Core revision 20131218
>> [    0.012206] ACPI: All ACPI Tables successfully acquired
>> [    0.013024] Mount-cache hash table entries: 256
>> [    0.013776] Last level iTLB entries: 4KB 512, 2MB 8, 4MB 8
>> [    0.013776] Last level dTLB entries: 4KB 512, 2MB 32, 4MB 32, 1GB 0
>> [    0.013776] tlb_flushall_shift: 2
>> [    0.016002] CPU: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz (fam: 06, model: 3a, stepping: 09)
>> [    0.017519] Performance Events: 16-deep LBR, IvyBridge events, Intel PMU driver.
>> [    0.018732] ... version:                2
>> [    0.019362] ... bit width:              48
>> [    0.020002] ... generic registers:      4
>> [    0.020574] ... value mask:             0000ffffffffffff
>> [    0.021324] ... max period:             000000007fffffff
>> [    0.022096] ... fixed-purpose events:   3
>> [    0.022664] ... event mask:             000000070000000f
>> [    0.024000] general protection fault: 0000 [#1]
>> [    0.024000] CPU: 0 PID: 1 Comm: swapper Not tainted 3.14.0-rc7-qemu-00059-g08edb33 #14
>> [    0.024000] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
>> [    0.024000] task: ffff88003e050000 ti: ffff88003e054000 task.ti: ffff88003e054000
>> [    0.024000] RIP: 0010:[<ffffffff8101148a>]  [<ffffffff8101148a>] intel_pmu_lbr_reset+0x2a/0x80
>> [    0.024000] RSP: 0000:ffff88003e055e78  EFLAGS: 00000002
>> [    0.024000] RAX: 0000000000000000 RBX: 0000000000000286 RCX: 0000000000000680
>> [    0.024000] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
>> [    0.024000] RBP: ffffffff81622120 R08: ffff88003ffee0e0 R09: ffff88003e00bf00
>> [    0.024000] R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000
>> [    0.024000] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>> [    0.024000] FS:  0000000000000000(0000) GS:ffffffff8161e000(0000) knlGS:0000000000000000
>> [    0.024000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [    0.024000] CR2: ffff8800019bb000 CR3: 0000000001611000 CR4: 00000000001407b0
>> [    0.024000] Stack:
>> [    0.024000]  ffffffff8101308a ffffffff8100e3da ffffffff8165ba62 0000000000000000
>> [    0.024000]  ffffffff8165b5bd 0000000000000000 0000000000000000 0000000000000000
>> [    0.024000]  ffffffff81655dcd 0000000000000000 0000000000000000 0000000000000000
>> [    0.024000] Call Trace:
>> [    0.024000]  [<ffffffff8101308a>] ? intel_pmu_cpu_starting+0xa/0x80
>> [    0.024000]  [<ffffffff8100e3da>] ? x86_pmu_notifier+0x5a/0xc0
>> [    0.024000]  [<ffffffff8165ba62>] ? init_hw_perf_events+0x4a5/0x4dd
>> [    0.024000]  [<ffffffff8165b5bd>] ? check_bugs+0x42/0x42
>> [    0.024000]  [<ffffffff81655dcd>] ? do_one_initcall+0x76/0xf9
>> [    0.024000]  [<ffffffff81276b70>] ? rest_init+0x70/0x70
>> [    0.024000]  [<ffffffff81655ea7>] ? kernel_init_freeable+0x57/0x177
>> [    0.024000]  [<ffffffff81276b70>] ? rest_init+0x70/0x70
>> [    0.024000]  [<ffffffff81276b75>] ? kernel_init+0x5/0xe0
>> [    0.024000]  [<ffffffff8128067a>] ? ret_from_fork+0x7a/0xb0
>> [    0.024000]  [<ffffffff81276b70>] ? rest_init+0x70/0x70
>> [    0.024000] Code: 00 8b 15 02 c4 63 00 85 d2 74 69 f6 05 af c3 63 00 3f 75 2d 85 d2 7e 5c 31 f6 31 c0 0f 1f 44 00 00 8b 0d d2 c3 63 00 89 c2 01 f1 <0f> 30 83 c6 01 3b 35 d3 c3 63 00 7c e9 f3 c3 0f 1f 80 00 00 00
>> [    0.024000] RIP  [<ffffffff8101148a>] intel_pmu_lbr_reset+0x2a/0x80
>> [    0.024000]  RSP <ffff88003e055e78>
>> [    0.024000] ---[ end trace ecbd794f78441b2c ]---
>> [    0.024002] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

When -cpu host is used, qemu/kvm passed the host CPUID F/M/S to the
guest. intel_pmu_cpu_*() -> intel_pmu_lbr_reset() uses rdmsr() /
wrmsr(), rather than the safe variants; if KVM does not support the
particular MSRs in question, you will see a #GP(0) there. See
https://lkml.org/lkml/2014/3/13/453 for a similar bug other PMU code.

HTH,
-- vs;
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