> -----Original Message-----
> From: Tomas Kovacik [mailto:Tomas.Kovacik@xxxxxxxxxxxxxx]
> Sent: 11 May 2007 10:03
> To: Petersson, Mats; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] running {MS/free}-DOS under XEN
>
> Hi Mats.
> here is output from my xm info:
> [root@aero xen]# xm info
> host : aero
> release : 2.6.20-1.2316.fc5xen
> version : #1 SMP Fri Apr 27 19:36:52 EDT 2007
> machine : x86_64
> nr_cpus : 8
> nr_nodes : 1
> sockets_per_node : 2
> cores_per_socket : 2
> threads_per_core : 2
> cpu_mhz : 2992
> hw_caps :
> bfebfbff:20100800:00000000:00000180:0000e4bd:00000000:00000001
> total_memory : 3070
> free_memory : 272
> xen_major : 3
> xen_minor : 0
> xen_extra : .3-0-1.2316.fc5
> xen_caps : xen-3.0-x86_64 hvm-3.0-x86_32
> hvm-3.0-x86_32p hvm-3.0-x86_64
> xen_pagesize : 4096
> platform_params : virt_start=0xffff800000000000
> xen_changeset : unavailable
> cc_compiler : gcc version 4.1.1 20070105 (Red Hat 4.1.1-51)
> cc_compile_by : brewbuilder
> cc_compile_domain : build.redhat.com
> cc_compile_date : Fri Apr 27 18:52:28 EDT 2007
> xend_config_format : 2
>
> do you know how could I install newer version of XEN, as you
> mentioned xen-3.1-testing, in fedora core I use? i tried yum
> install xen but it does not give me any newer version. do you
> know where could i find i.e. repositories for yum(which would
> be more confortable) or sources or package i could use?
Ehm, no I don't know of any FC compatible archive for the latest 3.1
version.
There is a 3.0.4 version available, built as an RPM for FC5, which
should be a noticable improvement on your 3.0.1 version:
http://www.xensource.com/download/index_3.0.4.html
> as you can see, i use Intel processors, which might be the
> problem as you mentioned...
> the thing is, i need DOS to run pharlab under it. i used qemu
> before. I run DOS successfully, but than when i was trying to
> run pharlab, it died with some other problem i cannot find
> even mentioned on internet, as pharlab is not usual software
> to use(it is kind of telecommunication switching centre
> running on proprietary HW up on DOS)
PharLap is a "DOS-Extender", which means that it does use tricks
involving real-to-potected mode excursions. I don't know if it assumes
that segment registers will remain in place after those excursions - if
that's the case, then you'd have problems using it on Intel at the
moment, I think.
There are several improvements in 3.1 that will make this "more likely
to work", but I wouldn't hold my breath. For a version after 3.1, there
will be a modified way of running real-mode on Intel processors, and
that will almost certainly achieve better compatibility with real
hardware.
--
Mats
> any idea?
> THANKS. TOMAS
>
> Petersson, Mats wrote:
>
>
>
>
>
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx]
> On Behalf Of
> Tomas Kovacik
> Sent: 10 May 2007 10:00
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] running {MS/free}-DOS under XEN
>
> Hi there.
> I was looking around for a log time but I did
> not find any
> user who would be able to run MS-DOS or freeDOS
> under Xen. I
> use vmlinuz-2.6.20-1.2316.fc5xen kernel and
> when I try to
> boot MS-DOS 7.1 it freezes with message shown
> in attachement
> 1. Also freeDOS freezes with message as in attachement2.
> I tried to install these two systems from the
> same iso image
> under qemu and it went OK so it seems that XEN
> there is some
> issue with XEN and DOS running together.
>
>
>
> Which version of Xen is this ("xm info" will give you
> version numbers),
> and is it an AMD or Intel processor you're using?
>
> I have recently (and succcessfully) run MS-DOS 6.22c on
> an AMD-V capable
> processor with xen-unstable, changeset circa 14800. I
> expect this will
> work on the latest xen-3.1-testing version as well.
> Whether it works on
> older versions, I'll let you figure out.
>
> On Intel processors, there is a potential problemm in that these
> processors don't support native real-mode in
> virtualized mode. This
> means that the guest has to trick around with
> "vm86-mode", which causes
> problems particularly with dos-extenders that switch
> from real mode to
> protected mode and back again [the real problem here is
> maintaining the
> extended segment values that may have been set during
> the excursion to
> protected mode - if there is no segment values
> "expected to survive" the
> transition, it should work just fine to switch between
> modes on Intel
> processors too].
>
> --
> Mats
>
>
>
>
> could somebody help me to run some version od
> DOS under XEN?
> thank you very much.
> TOMAS KOVACIK
>
>
>
>
>
>
>
>
>
>
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