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[Bug 1894617] Re: qemu-i386 mmap but offset greater than 32 bits

From: Launchpad Bug Tracker
Subject: [Bug 1894617] Re: qemu-i386 mmap but offset greater than 32 bits
Date: Thu, 08 Jul 2021 04:17:27 -0000

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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  qemu-i386 mmap but offset greater than 32 bits

Status in QEMU:

Bug description:
  I don't know if it's a problem, but I did, and it bothered me for a long time.
  When I use qemu-i386 and interact with the video card device,an error has 

  18534 ioctl(4,DRM_IOCTL_MODE_GETENCODER,{39,0,0,0,0}) = 0 ({39,4,34,3,0})
  18534 ioctl(4,DRM_IOCTL_MODE_CREATE_DUMB,{1080,1920,32,0,0,0,0}) = 0 
  18534 ioctl(4,DRM_IOCTL_MODE_ADDFB,{0,1920,1080,7680,32,24,1}) = 0 
  18534 ioctl(4,DRM_IOCTL_MODE_MAP_DUMB,{1,0,0}) = 0 ({1,0,5543018496})
  18534 mmap2(NULL,8294400,PROT_READ|PROT_WRITE,MAP_SHARED,4,0x14a63c) = -1 
errno=22 (Invalid argument)

  "5543018496" is the offset through ioctl() and it is "0x14a63c000".
  In qemu:
  ret = target_mmap(arg1, arg2, arg3,
        target_to_host_bitmask(arg4, mmap_flags_tbl),
        arg5, arg6 << MMAP_SHIFT);

  The type of "arg6" is ulong.When use qemu-i386, arg6 can't be set to
  "0x14a63c000".So it's wrong for my program.

  I want to find a good way to deal with this kind of problem, but I'm not very 
familiar with QEMU,
  so I came to ask how to deal with this problem.

  Thank you!

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