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BUG: KCSAN: data-race in install_new_memslots / mmio_info_in_cache

write to 0xffff8880a0c90000 of 8 bytes by task 13651 on cpu 0:
 install_new_memslots+0xef/0x130 arch/x86/kvm/../../../virt/kvm/kvm_main.c:906
 __kvm_set_memory_region+0xeea/0x1380 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1065
 kvm_set_memory_region+0x36/0x60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1088
 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1100 [inline]
 kvm_vm_ioctl+0x6d0/0x1190 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3224
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x991/0xc60 fs/ioctl.c:696
 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:718
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a0c90000 of 8 bytes by task 13655 on cpu 1:
 vcpu_match_mmio_gen arch/x86/kvm/x86.h:206 [inline]
 vcpu_match_mmio_gpa arch/x86/kvm/x86.h:234 [inline]
 mmio_info_in_cache+0x13f/0x1e0 arch/x86/kvm/mmu.c:3934
 kvm_mmu_page_fault+0x1b8/0xbc0 arch/x86/kvm/mmu.c:5474
 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
 vcpu_run arch/x86/kvm/x86.c:8290 [inline]
 kvm_arch_vcpu_ioctl_run+0x2a2/0xdc0 arch/x86/kvm/x86.c:8497
 kvm_vcpu_ioctl+0x752/0xa30 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2765
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x991/0xc60 fs/ioctl.c:696
 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:718
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13655 Comm: syz-executor.4 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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