Reinhard Karcher wrote:
> Am Mittwoch, 28. Mai 2014, 10:14:10 schrieb Frantisek Hanzlik:
>> Hello Stas,
>>
>> if I understand it from Your last devel branch changes, from Linux
>> kernel 3.14+ will no longer be possible to use DPMI on i386 systems
>> in VM86 mode?
>> It would be annoying thing for me, because I use 32-bit systems for
>> all my DOS apps, due to significantly higher performance over both
>> emulation modes.
>> Please, what is reason for this step? Linux kernel developers have
>> always emphasized the need for kernel API preservation, what happened
>> in this case?
>> It will affect other emulators (wine, qemu) too?
> 
> Hello Franta,
> 
> as far as I know, the change only affects 64-bit kernels. It was 
> introduces because of an information leak with 16-Bit dmpi applications.
> Linus committed a change to restore the old behavior online.
> I created a file ldt16.conf in /etc/sysctl.d/ containing the line:
> abi.ldt16 = 1
> and got the old behavior after reboot. You could also use the command:
>  echo 1 > /proc/sys/abi/ldt16
> to change your kernel without reboot.
> Linus mentioned complaints from wine users.
> The commit to the linux kernel with the workaround is:
> fa81511bb0bbb2b1aace3695ce869da9762624ff
> 
> Reinhard

Hi Reinhard and Stas,

thank You for the explanation.



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