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BUG: KCSAN: data-race in install_new_memslots / kvm_write_guest_offset_cached

write to 0xffff888094cd0000 of 8 bytes by task 15361 on cpu 1:
 install_new_memslots+0xe9/0x130 arch/x86/kvm/../../../virt/kvm/kvm_main.c:981
 __kvm_set_memory_region+0xeea/0x1370 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1140
 kvm_set_memory_region+0x31/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1163
 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1175 [inline]
 kvm_vm_ioctl+0x63b/0x13b0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3391
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x101/0x150 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888094cd0000 of 8 bytes by task 15384 on cpu 0:
 kvm_write_guest_offset_cached+0xbf/0x270 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2273
 kvm_write_guest_cached+0x34/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2296
 kvm_setup_pvclock_page arch/x86/kvm/x86.c:2371 [inline]
 kvm_guest_time_update arch/x86/kvm/x86.c:2461 [inline]
 vcpu_enter_guest+0x2170/0x3a20 arch/x86/kvm/x86.c:8160
 vcpu_run arch/x86/kvm/x86.c:8498 [inline]
 kvm_arch_vcpu_ioctl_run+0x298/0xdc0 arch/x86/kvm/x86.c:8720
 kvm_vcpu_ioctl+0x70b/0x9d0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2932
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x101/0x150 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15384 Comm: syz-executor.2 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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