qemu-i386 mmap but offset greater than 32 bits

Bug #1894617 reported by Tony.LI
This bug affects 1 person
Affects Status Importance Assigned to Milestone

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 occurred:

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 ({1080,1920,32,0,1,7680,8294400})
18534 ioctl(4,DRM_IOCTL_MODE_ADDFB,{0,1920,1080,7680,32,24,1}) = 0 ({66,1920,1080,7680,32,24,1})
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!

Revision history for this message
Thomas Huth (th-huth) wrote :

The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.

If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".

If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:

1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:


and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.

2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" or "Confirmed" within the next 60 days (other-
wise it will get closed as "Expired"). We will then eventually migrate
the ticket automatically to the new system (but you won't be the reporter
of the bug in the new system and thus you won't get notified on changes

Thank you and sorry for the inconvenience.

Changed in qemu:
status: New → Incomplete
tags: added: i386 linux-user
Revision history for this message
Launchpad Janitor (janitor) wrote :

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

Changed in qemu:
status: Incomplete → Expired
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