On Tue, 22 Dec 2015 11:34:26 +0100
bo...@geodb.org wrote:
> Hello
>
> I've compiled the DOSEMU2 devel branch (2.0pre4, 1893) on an Ubuntu
> 12.04 LTS (x86 / 32-bit / PAE). This fails due to the usage of
> "X86_EFLAGS_FIXED" in the file "src/emu-i386/kvm.c".
>
> I believe that the define of "X86_EFLAGS_FIXED" is missing in the kernel
> 3.2 of my Ubuntu version. There has been a rename of "X86_EFLAGS_BIT1"
> to "X86_EFLAGS_FIXED" some time ago:
>
> https://www.kernel.org/pub/linux/kernel/v3.0/ChangeLog-3.10.60
>
>
> In the meantime, I added the following line to "kvm.c" and could compile
> successfully DOSEMU2:
>
> #define X86_EFLAGS_FIXED 0x00000002
>
> But I believe, this is NOT the right thing... DOSEMU2 runs, but I use
> "vm86" and not "kvm".
>
>
> So, coming back to the subject of this message:
>
> Is DOSEMU2 supposed to work on older Linux Kernels ? If not, then this
> message can be sent to device null.
>
> Andreas
>
>
Hi Andreas,
Firstly you should raise an issue at https://github.com/stsp/dosemu2/issues
as it'll get tracked properly there and Stas / Bart won't miss it. Regarding
use of vm86, I think on 386 kernels it's still the default, so are you forcing
it to try kvm? There's a new dosemu.conf variable called $_cpu_vm since kvm
support got added. Here's the section from the default dosemu.conf.
# Usage of cpu emulation: "off" (default on x86),
# "vm86" only (default on x86-64) or "full" (vm86 and DPMI, experimental!).
# Use "vm86sim" or "fullsim" to use simulation instead of JIT code generation.
# $_cpu_emu = "off"
# Select cpu virtualization mode.
# "vm86" - use v86 mode via vm86() syscall. Only available on x86-32.
# "kvm" - use KVM, hardware-assisted in-kernel virtual machine.
# "emulated" - use CPU emulator
# "auto" - select whatever works
# $_cpu_vm = "auto"
Remember that kvm support requires a certain processor type to work, but in any
case you should raise the issue because dosemu2 should definitely compile on
kernel 3.2 without changes.
--
Andrew Bird <a...@spheresystems.co.uk>
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