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BUG: KCSAN: data-race in check_mmio_spte / kvm_set_memslot

write to 0xffff88809cd4b800 of 8 bytes by task 31973 on cpu 1:
 install_new_memslots arch/x86/kvm/../../../virt/kvm/kvm_main.c:1092 [inline]
 kvm_set_memslot+0x866/0x910 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1168
 __kvm_set_memory_region+0x708/0x910 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1314
 kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1335 [inline]
 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1347 [inline]
 kvm_vm_ioctl+0x81d/0x17c0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3640
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xc9/0x130 fs/ioctl.c:760
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:760
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88809cd4b800 of 8 bytes by task 31952 on cpu 0:
 check_mmio_spte+0x5a/0x190 arch/x86/kvm/mmu/mmu.c:507
 handle_mmio_page_fault+0x594/0x860 arch/x86/kvm/mmu/mmu.c:3996
 kvm_mmu_page_fault+0x369/0x410 arch/x86/kvm/mmu/mmu.c:5416
 handle_ept_misconfig+0x99/0x230 arch/x86/kvm/vmx/vmx.c:5329
 vmx_handle_exit+0x58b/0xb90 arch/x86/kvm/vmx/vmx.c:6090
 vcpu_enter_guest+0x1ca9/0x2760 arch/x86/kvm/x86.c:8599
 vcpu_run+0x27e/0x790 arch/x86/kvm/x86.c:8664
 kvm_arch_vcpu_ioctl_run+0x38d/0x6a0 arch/x86/kvm/x86.c:8885
 kvm_vcpu_ioctl+0x565/0x950 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3166
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xc9/0x130 fs/ioctl.c:760
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:760
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 31952 Comm: syz-executor.5 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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