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R15QcD_ydh5Kyqfi6NpFBZN3T7ru42Lo X-Proofpoint-GUID: R15QcD_ydh5Kyqfi6NpFBZN3T7ru42Lo On 24/10/2024 07:21, Sandipan Das wrote: > Thanks for bringing this to our attention. > >> On Tue, Oct 22, 2024 at 03:55:05PM +0100, John Garry wrote: >>> Hi all, >>> >>> On my VM, "perf top" gives this stackframe on v6.12-rc4: >>> >>> [ 930.527581] unchecked MSR access error: WRMSR to 0xc0010200 (tried to >>> write 0x0000020000510076) at rIP: 0xffffffff94ead548 >>> (native_write_msr+0x8/0x30) >>> [ 930.531135] Call Trace: >>> [ 930.531456] >>> [ 930.531749] ? ex_handler_msr+0x138/0x150 >>> [ 930.532285] ? search_extable+0x26/0x30 >>> [ 930.532780] ? fixup_exception+0x9c/0x310 >>> [ 930.533405] ? exc_general_protection+0x10c/0x490 >>> [ 930.534081] ? asm_exc_general_protection+0x26/0x30 >>> [ 930.534768] ? native_write_msr+0x8/0x30 >>> [ 930.535357] ? srso_alias_return_thunk+0x5/0xfbef5 >>> [ 930.535998] x86_pmu_enable_event+0xa5/0xd0 >>> [ 930.536641] amd_pmu_enable_all+0x4e/0x80 >>> [ 930.537211] ctx_resched+0x13b/0x1d0 >>> [ 930.537735] __perf_install_in_context+0x2a2/0x390 >>> [ 930.538439] remote_function+0x49/0x60 >>> [ 930.538931] __flush_smp_call_function_queue+0xdc/0x700 >>> [ 930.539694] ? __pfx_remote_function+0x10/0x10 >>> [ 930.540480] __sysvec_call_function_single+0x38/0x140 >>> [ 930.541134] sysvec_call_function_single+0x6c/0x90 >>> [ 930.541970] >>> [ 930.542269] >>> [ 930.542766] asm_sysvec_call_function_single+0x1a/0x20 >>> [ 930.543493] RIP: 0010:pv_native_safe_halt+0xf/0x20 >>> [ 930.544195] Code: 22 d7 e9 ff b5 13 00 0f 1f 40 00 90 90 90 90 90 90 90 >>> 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d d3 e3 25 00 fb f4 >>> d7 b5 13 00 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 >>> [ 930.546841] RSP: 0018:ffffffff96a03e68 EFLAGS: 00000206 >>> [ 930.547563] RAX: 0000000000000006 RBX: ffffffff96a269c0 RCX: >>> 0000000000000000 >>> [ 930.548579] RDX: 0000000000000000 RSI: 0000000000000000 RDI: >>> ffffffff94f53f31 >>> [ 930.549568] RBP: 0000000000000000 R08: 0000000000000001 R09: >>> 0000000000000000 >>> [ 930.550529] R10: 0000000000000001 R11: 0000000000000000 R12: >>> ffffffff970608e0 >>> [ 930.551582] R13: ffffffff96a269c0 R14: 0000000000000000 R15: >>> 0000000000000000 >>> [ 930.552683] ? do_idle+0x1d1/0x2a0 >>> [ 930.553182] default_idle+0x9/0x20 >>> [ 930.553670] default_idle_call+0x7d/0xc0 >>> [ 930.554226] do_idle+0x1d1/0x2a0 >>> [ 930.554696] cpu_startup_entry+0x29/0x30 >>> [ 930.555154] rest_init+0x12e/0x1d0 >>> [ 930.555621] start_kernel+0x60f/0x6d0 >>> [ 930.556064] x86_64_start_reservations+0x21/0x40 >>> [ 930.556633] x86_64_start_kernel+0x91/0xa0 >>> [ 930.557107] common_startup_64+0x13e/0x141 >>> [ 930.558038] >>> [ 930.738880] perf: interrupt took too long (2511 > 2500), lowering >>> kernel.perf_event_max_sample_rate to 79000 >>> [ 930.772912] perf: interrupt took too long (3414 > 3138), lowering >>> kernel.perf_event_max_sample_rate to 58000 >>> [ 930.797764] perf: interrupt took too long (4275 > 4267), lowering >>> kernel.perf_event_max_sample_rate to 46000 >>> [ 931.117733] perf: interrupt took too long (5345 > 5343), lowering >>> kernel.perf_event_max_sample_rate to 37000 >>> [ 933.862829] perf: interrupt took too long (6765 > 6681), lowering >>> kernel.perf_event_max_sample_rate to 29000 >>> [opc@jgarry-atomic-write-exp-e4-8-instance-20231214-1221 ~]$ ^C >>> >>> a known issue? > I am unable to replicate this with KVM guests. MSR 0xc0010200 is the > first PERF_CTL (event selector) and generally, unchecked MSR accesses > happen when the hypervisor restricts what guests can access. > > Can you share details about the hypervisor? > If its just KVM, can you share the host kernel version as well? It's KVM, but I don't know the host version - I don't think it's easy info to get. Here's some KVM prints: [opc@jgarry-atomic-write-exp-e4-8-instance-20231214-1221 ~]$ sudo dmesg | grep -i kvm [ 0.000000] Hypervisor detected: KVM [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00 [ 0.000000] kvm-clock: using sched offset of 394705327075 cycles [ 0.000002] clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns [ 0.010289] kvm-guest: APIC: eoi() replaced with kvm_guest_apic_eoi_write() [ 0.010297] kvm-guest: KVM setup pv remote TLB flush [ 0.010300] kvm-guest: setup PV sched yield [ 0.010324] Booting paravirtualized kernel on KVM [ 0.016465] kvm-guest: PV spinlocks enabled [ 0.058487] kvm-guest: APIC: send_IPI_mask() replaced with kvm_send_ipi_mask() [ 0.058491] kvm-guest: APIC: send_IPI_mask_allbutself() replaced with kvm_send_ipi_mask_allbutself() [ 0.058492] kvm-guest: setup PV IPIs [ 0.280302] clocksource: Switched to clocksource kvm-clock [ 1.302630] systemd[1]: Detected virtualization kvm. [ 1.312201] systemd[1]: Initializing machine ID from KVM UUID. [ 13.771695] systemd[1]: Detected virtualization kvm. [ 15.072121] kvm_amd: Nested Virtualization enabled [ 15.072124] kvm_amd: Nested Paging enabled [opc@jgarry-atomic-write-exp-e4-8-instance-20231214-1221 ~]$ > >>> more /proc/cpuinfo gives: >>> >>> processor : 0 >>> vendor_id : AuthenticAMD >>> cpu family : 25 >>> model : 1 >>> model name : AMD EPYC 7J13 64-Core Processor >>> stepping : 1 >>> microcode : 0x1000065 >>> cpu MHz : 2445.322 >>> cache size : 512 KB >>> physical id : 0 >>> siblings : 16 >>> core id : 0 >>> cpu cores : 8 >>> apicid : 0 >>> initial apicid : 0 >>> fpu : yes >>> fpu_exception : yes >>> cpuid level : 16 >>> wp : yes >>> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca >>> cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt >>> pdpe1gb rdtscp lm rep_good nopl xtopology cpuid extd_apicid tsc_kn >>> own_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt >>> tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy >>> svm cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topo >>> ext perfctr_core ssbd ibrs ibpb stibp vmmcall fsgsbase tsc_adjust bmi1 avx2 >>> smep bmi2 erms invpcid rdseed adx smap clflushopt clwb sha_ni xsaveopt >>> xsavec xgetbv1 xsaves clzero xsaveerptr wbnoinvd arat npt nrip_sa >>> ve umip pku ospke vaes vpclmulqdq rdpid arch_capabilities >>> bugs : sysret_ss_attrs null_seg spectre_v1 spectre_v2 >>> spec_store_bypass srso ibpb_no_ret >>> bogomips : 4890.64 >>> TLB size : 1024 4K pages >>> clflush size : 64 >>> cache_alignment : 64 >>> address sizes : 40 bits physical, 48 bits virtual >>> power management: >>> > I tried replicating this on systems with an EPYC 7713 (very similar to the > one above) and an EPYC 9654 but had no luck. Thanks for checking. but wouldn't you know it - it does not occur now. I guess that it will reappear... I'll let you know. Thanks John