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+Strange invalid access errors for very basic OS
+Description of problem:
+Currently I'm studying OS development. I found numerous guides on that topic, however [this one](https://github.com/cfenollosa/os-tutorial/tree/master/01-bootsector-barebones) is most close to what I have been doing.  
+When `.bin` file is launched with `-d guest_errors` flag, before any OS output exactly 512 error messages appear in logs, that look like that:
+```
+Invalid access at addr 0xFEBB0000, size 1, region '(null)', reason: rejected
+Invalid access at addr 0x0, size 1, region '(null)', reason: rejected
+Invalid access at addr 0xFEBB0001, size 1, region '(null)', reason: rejected
+Invalid access at addr 0x1, size 1, region '(null)', reason: rejected
+Invalid access at addr 0xFEBB0002, size 1, region '(null)', reason: rejected
+...
+and it goes up to
+...
+Invalid access at addr 0xFEBB00FE, size 1, region '(null)', reason: rejected
+Invalid access at addr 0xFE, size 1, region '(null)', reason: rejected
+Invalid access at addr 0xFEBB00FF, size 1, region '(null)', reason: rejected
+Invalid access at addr 0xFF, size 1, region '(null)', reason: rejected
+```
+Apparently, the OS boots normally after that. Should I be concerned about these messages or Should I just ignore them?
+That looks strange and confusing, not a piece of my code calls these addresses. Maybe I'm doing something wrong?
+Steps to reproduce:
+1. Install `nasm` compiler (nasm package for apt)
+2. Create a file named `os.asm` with exactly four lines:
+```asm
+loop:
+    jmp loop
+times 510-($-$$) db 0
+dw 0xaa55
+```
+3. Build it with `nasm -f bin os.asm -o os.bin`
+4. Run it with `qemu-system-i386 -d guest_errors -drive format=raw,file=./os.bin`
+5. ...enjoy error messages.