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BUG: KCSAN: data-race in kvm_set_memslot / mark_mmio_spte

write to 0xffff8880973f8800 of 8 bytes by task 27806 on cpu 0:
 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:3639
 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+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880973f8800 of 8 bytes by task 27795 on cpu 1:
 make_mmio_spte arch/x86/kvm/mmu/mmu.c:452 [inline]
 mark_mmio_spte+0x60/0x230 arch/x86/kvm/mmu/mmu.c:468
 set_mmio_spte arch/x86/kvm/mmu/mmu.c:496 [inline]
 set_spte+0x629/0x630 arch/x86/kvm/mmu/mmu.c:2999
 mmu_set_spte+0x160/0xa00 arch/x86/kvm/mmu/mmu.c:3117
 __direct_map+0x633/0x950 arch/x86/kvm/mmu/mmu.c:3365
 direct_page_fault+0x314/0x670 arch/x86/kvm/mmu/mmu.c:4136
 kvm_tdp_page_fault+0x92/0xa0 arch/x86/kvm/mmu/mmu.c:4208
 kvm_mmu_do_page_fault arch/x86/kvm/mmu.h:115 [inline]
 kvm_mmu_page_fault+0xca/0x410 arch/x86/kvm/mmu/mmu.c:5422
 handle_ept_misconfig+0x99/0x230 arch/x86/kvm/vmx/vmx.c:5332
 vmx_handle_exit+0x554/0xb40 arch/x86/kvm/vmx/vmx.c:6093
 vcpu_enter_guest+0x189c/0x23e0 arch/x86/kvm/x86.c:8593
 vcpu_run+0x26e/0x750 arch/x86/kvm/x86.c:8658
 kvm_arch_vcpu_ioctl_run+0x38d/0x690 arch/x86/kvm/x86.c:8879
 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+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 27795 Comm: syz-executor.3 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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