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BUG: KCSAN: data-race in kvm_arch_vcpu_load / pvclock_gtod_notify

write to 0xffffffff85fdd628 of 4 bytes by interrupt on cpu 0:
 update_pvclock_gtod arch/x86/kvm/x86.c:1552 [inline]
 pvclock_gtod_notify+0xa4/0x260 arch/x86/kvm/x86.c:7126
 notifier_call_chain+0xd7/0x160 kernel/notifier.c:95
 __raw_notifier_call_chain kernel/notifier.c:396 [inline]
 raw_notifier_call_chain+0x37/0x50 kernel/notifier.c:403
 update_pvclock_gtod kernel/time/timekeeping.c:578 [inline]
 timekeeping_update+0x1b5/0x2d0 kernel/time/timekeeping.c:672
 timekeeping_advance+0x882/0xd80 kernel/time/timekeeping.c:2120
 update_wall_time+0x19/0x20 kernel/time/timekeeping.c:2137
 tick_do_update_jiffies64+0x1ae/0x260 kernel/time/tick-sched.c:94
 tick_sched_do_timer+0xd4/0xe0 kernel/time/tick-sched.c:138
 tick_sched_timer+0x43/0xe0 kernel/time/tick-sched.c:1292
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x288/0x600 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 find_watchpoint kernel/kcsan/core.c:73 [inline]
 __kcsan_check_watchpoint+0xec/0x180 kernel/kcsan/core.c:266

read to 0xffffffff85fdd628 of 4 bytes by task 2506 on cpu 1:
 kvm_check_tsc_unstable arch/x86/kvm/x86.c:1838 [inline]
 kvm_arch_vcpu_load+0x1e5/0x620 arch/x86/kvm/x86.c:3421
 vcpu_load+0x4c/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:167
 kvm_unload_vcpu_mmu arch/x86/kvm/x86.c:9460 [inline]
 kvm_free_vcpus arch/x86/kvm/x86.c:9475 [inline]
 kvm_arch_destroy_vm+0x119/0x390 arch/x86/kvm/x86.c:9575
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:750 [inline]
 kvm_put_kvm+0x390/0x650 arch/x86/kvm/../../../virt/kvm/kvm_main.c:771
 kvm_vcpu_release+0x51/0x60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2594
 __fput+0x1e1/0x520 fs/file_table.c:280
 ____fput+0x1f/0x30 fs/file_table.c:313
 task_work_run+0xf6/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2506 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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