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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 1:
 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
 __sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:95

read to 0xffffffff85fdd628 of 4 bytes by task 12594 on cpu 0:
 kvm_check_tsc_unstable arch/x86/kvm/x86.c:1838 [inline]
 kvm_arch_vcpu_load+0x1e5/0x620 arch/x86/kvm/x86.c:3421
 kvm_sched_in+0x8e/0xc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4227
 __fire_sched_in_preempt_notifiers kernel/sched/core.c:3029 [inline]
 fire_sched_in_preempt_notifiers kernel/sched/core.c:3035 [inline]
 finish_task_switch+0xee/0x260 kernel/sched/core.c:3227
 context_switch kernel/sched/core.c:3387 [inline]
 __schedule+0x319/0x640 kernel/sched/core.c:4069
 preempt_schedule_irq+0x57/0x90 kernel/sched/core.c:4319
 restore_regs_and_return_to_kernel+0x0/0x25
 __sanitizer_cov_trace_switch+0x30/0x80 kernel/kcov.c:204
 x86_decode_insn+0x4f0/0x2cd0 arch/x86/kvm/emulate.c:5280
 x86_emulate_instruction+0x5db/0x11f0 arch/x86/kvm/x86.c:6634
 kvm_mmu_page_fault+0x233/0xbc0 arch/x86/kvm/mmu.c:5489
 handle_ept_violation+0x1e5/0x340 arch/x86/kvm/vmx/vmx.c:5193
 vmx_handle_exit+0x1c2/0xd60 arch/x86/kvm/vmx/vmx.c:5949
 vcpu_enter_guest+0xc1f/0x3820 arch/x86/kvm/x86.c:8226

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12594 Comm: syz-executor.3 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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