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Message-ID: <57783d0c-3e75-47e1-a22a-818ad12e5f5c@email.android.com> Date: Fri, 21 Mar 2014 12:09:35 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Venkatesh Srinivas <venkateshs@...gle.com>, 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>, 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 Calling this a bug in the PMU code is ridiculous. If KVM tells the system it os a specific vendor-family-model-stepping but diverges in behavior then it, by definition, is broken. On March 21, 2014 12:04:32 PM PDT, Venkatesh Srinivas <venkateshs@...gle.com> wrote: >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; -- Sent from my mobile phone. Please pardon brevity and lack of formatting. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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