On Wed, 2010-05-12 at 00:09 +0300, Mohammed Gamal wrote: > On Tue, May 11, 2010 at 11:56 PM, Andy Walls <awa...@md.metrocast.net> 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
