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Re: [Qemu-devel] qemu-kvm problem with DOS/4GW extender and EMM386.EXE


From: Andy Walls
Subject: Re: [Qemu-devel] qemu-kvm problem with DOS/4GW extender and EMM386.EXE
Date: Tue, 11 May 2010 18:10:21 -0400

On Wed, 2010-05-12 at 00:09 +0300, Mohammed Gamal wrote:
> On Tue, May 11, 2010 at 11:56 PM, Andy Walls <address@hidden> wrote:
> > Running an MS-DOS 6.22 image with qemu-kvm on a RedHat Linux OS, I
> > noticed the guest OS becomes hung and my dmesg gets spammed with
> >
> >        set_cr0: #GP, set PG flag with a clear PE flag
> >
> > That message appears to be the linux kernel's kvm emulator griping about
> > Paging Enable bit being enabled while the Protection Enable bit is set
> > for real mode.  (The Intel manual says this should be a protection
> > fault).
> >
> > The program that causes this has the DOS/4GW DOS extender runtime
> > compiled into it.
> >
> > I found that when I don't load the EMM386.EXE memory manager, the
> > problem doesn't occur.
> >
> > Here's a kvmtrace segment of when things are not working:
> >
> > 0 (+           0)  IO_WRITE      vcpu = 0x00000000  pid = 0x00001997 [ port 
> > = 0x0070, size = 1 ]
> > 28471049668815 (+        4000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049671815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000004e, rip = 0x00000000 00002a18 ]
> > 0 (+           0)  PAGE_FAULT    vcpu = 0x00000000  pid = 0x00001997 [ 
> > errorcode = 0x00000000, virt = 0x00000000 0001ba28 ]
> > 28471049675815 (+        4000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049678815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000004e, rip = 0x00000000 00000334 ]
> > 0 (+           0)  PAGE_FAULT    vcpu = 0x00000000  pid = 0x00001997 [ 
> > errorcode = 0x00000000, virt = 0x00000000 00019344 ]
> > 28471049681815 (+        3000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049685815 (+        4000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x00000000, rip = 0x00000000 000002a7 ]
> > 0 (+           0)  CR_READ       vcpu = 0x00000000  pid = 0x00001997 [ CR# 
> > = 0, value = 0x00000000 80000011 ]
> > 28471049688815 (+        3000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049691815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x00000010, rip = 0x00000000 000002ae ]
> > 0 (+           0)  LMSW          vcpu = 0x00000000  pid = 0x00001997 [ 
> > value = 0x80000011 ]
> > 28471049696815 (+        5000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049699815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000004e, rip = 0x00000000 00005593 ]
> > 0 (+           0)  PAGE_FAULT    vcpu = 0x00000000  pid = 0x00001997 [ 
> > errorcode = 0x00000000, virt = 0x00000000 000262e3 ]
> > 28471049703815 (+        4000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049706815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000004e, rip = 0x00000000 000044d6 ]
> > 0 (+           0)  PAGE_FAULT    vcpu = 0x00000000  pid = 0x00001997 [ 
> > errorcode = 0x00000000, virt = 0x00000000 00025226 ]
> > 28471049709815 (+        3000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049713815 (+        4000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000004e, rip = 0x00000000 000055c0 ]
> > 0 (+           0)  PAGE_FAULT    vcpu = 0x00000000  pid = 0x00001997 [ 
> > errorcode = 0x00000002, virt = 0x00000000 00024f79 ]
> > 28471049717815 (+        4000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049721815 (+        4000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x00000000, rip = 0x00000000 00002a69 ]
> > 0 (+           0)  CR_READ       vcpu = 0x00000000  pid = 0x00001997 [ CR# 
> > = 0, value = 0x00000000 80000011 ]
> > 28471049723815 (+        2000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049726815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x00000010, rip = 0x00000000 00002a73 ]
> > 0 (+           0)  LMSW          vcpu = 0x00000000  pid = 0x00001997 [ 
> > value = 0x80000010 ]
> > 28471049781815 (+       55000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049784815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000004e, rip = 0x00000000 00001fb8 ]
> > 0 (+           0)  PAGE_FAULT    vcpu = 0x00000000  pid = 0x00001997 [ 
> > errorcode = 0x00000000, virt = 0x00000000 00022d08 ]
> > 28471049788815 (+        4000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049792815 (+        4000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000007b, rip = 0x00000000 00001fd6 ]
> > 0 (+           0)  IO_WRITE      vcpu = 0x00000000  pid = 0x00001997 [ port 
> > = 0x0020, size = 1 ]
> > 28471049794815 (+        2000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049797815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000007b, rip = 0x00000000 00001fd9 ]
> > 0 (+           0)  IO_READ       vcpu = 0x00000000  pid = 0x00001997 [ port 
> > = 0x0020, size = 1 ]
> > 28471049800815 (+        3000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049803815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000004e, rip = 0x00000000 00001f70 ]
> > 0 (+           0)  PAGE_FAULT    vcpu = 0x00000000  pid = 0x00001997 [ 
> > errorcode = 0x00000000, virt = 0x00000000 0001a072 ]
> > 28471049807815 (+        4000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049811815 (+        4000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x00000000, rip = 0x00000000 00002a69 ]
> > 0 (+           0)  CR_READ       vcpu = 0x00000000  pid = 0x00001997 [ CR# 
> > = 0, value = 0x00000000 80000011 ]
> > 28471049815815 (+        4000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049818815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x00000010, rip = 0x00000000 00002a73 ]
> > 0 (+           0)  LMSW          vcpu = 0x00000000  pid = 0x00001997 [ 
> > value = 0x80000010 ]
> > 28471049840815 (+       22000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049844815 (+        4000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000007b, rip = 0x00000000 00001fd6 ]
> > 0 (+           0)  IO_WRITE      vcpu = 0x00000000  pid = 0x00001997 [ port 
> > = 0x0020, size = 1 ]
> > 28471049846815 (+        2000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049849815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000007b, rip = 0x00000000 00001fd9 ]
> > 0 (+           0)  IO_READ       vcpu = 0x00000000  pid = 0x00001997 [ port 
> > = 0x0020, size = 1 ]
> > 28471049851815 (+        2000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049855815 (+        4000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x00000000, rip = 0x00000000 00002a69 ]
> > 0 (+           0)  CR_READ       vcpu = 0x00000000  pid = 0x00001997 [ CR# 
> > = 0, value = 0x00000000 80000011 ]
> > 28471049858815 (+        3000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049861815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x00000010, rip = 0x00000000 00002a73 ]
> > 0 (+           0)  LMSW          vcpu = 0x00000000  pid = 0x00001997 [ 
> > value = 0x80000010 ]
> > 28471049882815 (+       21000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049885815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000007b, rip = 0x00000000 00001fd6 ]
> > 0 (+           0)  IO_WRITE      vcpu = 0x00000000  pid = 0x00001997 [ port 
> > = 0x0020, size = 1 ]
> > 28471049887815 (+        2000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049890815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000007b, rip = 0x00000000 00001fd9 ]
> > 0 (+           0)  IO_READ       vcpu = 0x00000000  pid = 0x00001997 [ port 
> > = 0x0020, size = 1 ]
> > 28471049892815 (+        2000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049896815 (+        4000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x00000000, rip = 0x00000000 00002a69 ]
> > 0 (+           0)  CR_READ       vcpu = 0x00000000  pid = 0x00001997 [ CR# 
> > = 0, value = 0x00000000 80000011 ]
> > 28471049900815 (+        4000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049903815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x00000010, rip = 0x00000000 00002a73 ]
> > 0 (+           0)  LMSW          vcpu = 0x00000000  pid = 0x00001997 [ 
> > value = 0x80000010 ]
> > 28471049933815 (+       30000)  VMENTRY       vcpu = 0x00000000  pid = 
> > 0x00001997
> > 28471049936815 (+        3000)  VMEXIT        vcpu = 0x00000000  pid = 
> > 0x00001997 [ exitcode = 0x0000007b, rip = 0x00000000 00001fd6 ]
> >
> >
> >
> >
> > To me it appears EMM386.EXE enables paging, and the DOS/4GW DOS extender
> > tries to manipulate the PE bit in CR0 with LMSW but doesn't succeed.
> >
> > These programs appear to work fine in VMWare and on real hardware.
> >
> >
> > Any ideas on how to make EMM386.EXE and the DOS/$GW extender work in
> > qemu-kvm?
> >
> > Regards,
> > Andy
> >
> >
> >
> 
> Are you using this on an Intel-VT machine?

No, an AMD 64 bit machine.

Regards,
Andy





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