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Re: [Qemu-devel] qemu-kvm problem with DOS/4GW extender and EMM386.EXE
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From: |
Mohammed Gamal |
|
Subject: |
Re: [Qemu-devel] qemu-kvm problem with DOS/4GW extender and EMM386.EXE |
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Date: |
Wed, 12 May 2010 00:09:54 +0300 |
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?