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[Qemu-discuss] qemu 32bit ioctl cmd on 64bit host

From: Peter Matthias
Subject: [Qemu-discuss] qemu 32bit ioctl cmd on 64bit host
Date: Sun, 5 Mar 2017 22:58:31 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0


I make ioctl calls on 32bit guests on an X64 host.

For 32bit positive cmds everthing is o.k.:

27847 openat(AT_FDCWD,"/dev/fb0",O_RDWR) = 7
27847 ioctl(7,17922,-151018232,0,-151018232,330208) = 0

If I use an 32bit negative cmd, qemu tells me the cmd is not implemented:

27847 openat(AT_FDCWD,"/dev/input/event0",O_RDONLY) = 8
27847 ioctl(8,-2145434336,-151018012,0,-151018012,-151018032)Unsupported ioctl: cmd=0xffffffff801f4520
 = -1 errno=38 (Function not implemented)

Not sure where to address this. I think this is a bug. Everthing works well on native hardware.

qemus used:
qemu-arm, qemu-mipsel, qemu-riscv32 (with native code, of course).


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