[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
Here is the exact working command line I used for Windows 95C (OSR2.5): qemu-system-i386 -cpu pentium -m 128 -vga std -no-kvm -hda ~/Win95C.qcow2 -nodefaults -no-hpet -no-acpi -nodefaults -monitor stdio -sdl -boot menu=on,order=c,splash-time=2000 -accel tcg,thread=single To install the OS I simply added -cdrom and -fda, but everything else stayed the same. This was using the latest master (33f18cf, after v4.1.0) and its included bios binaries. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
After hours bisecting various QEMU/SeaBIOS combinations, Brad figured out a new commit: 0a7fa00a13f0852ec6fa83ab987a5ee7978d9867 is the first bad commit Author: Emilio G. Cota Date: Mon Aug 13 20:52:26 2018 -0400 configure: enable mttcg for i386 and x86_64 Note 1: Brad was not using '-M isapc'. Note 2: Brad was using the pc-bios/ folder checkout'd at v4.1.0 or 33f18cf7dc to avoid the SeaBIOS issues reported previously Brad could succeed booting QEMU using '-accel thread=single' on 0a7fa00a13. ** Tags added: mttcg -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
Re: [Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
On Wed, 2019-08-21 at 00:31 +0200, Aleksandar Markovic wrote: > 20.08.2019. 23.56, "Brad Parker" <1819...@bugs.launchpad.net> је написао/ла: > > > > So it looks like even though that commit fixed it, it seems to break > > again (differently) in 3.0.0, so I'll need to do another bisect between > > cfcca36 and v3.0.0 then I guess. And keep working my way up to master as > > well. > > > > -- > > At least you will have an interesting debugging story to tell afterwards. I > wish you luck! Does disabling the boot logo help? I do have a working win98 VM here (nostaligia reasons, that was my first and last primary OS prior to me switching to Linux) and what you describe seems to be the hang during the win98 boot logo? If it is disabled (logo=0 in msdos.sys, under [Options]) or if you quickly press escape while the logo just showed up, the vm won't hang, and work normally. The funniest thing is that when _KVM_ is disabled (that is TCG is used instead), the bug doesn't happen, so it might instruction emulation bug in KVM. Or something timing related. I also usually see even a message from the in-kernel instruction decoder about 'cmpchg decoded as nop' or something like that, but don't seem to see it anymore on current kernel. I just verified these claims with qemu-4.1.0, kernel 5.3.0-rc4, and an win98 (although I only booted it with and without logo few times, and didn't do an install) Speaking of other issue you will face with win98 is that it doesn't detect the PnP bios by default, so it doesn't see any devices qemu exposes on the PCI bus. Thankfully this can be fixed by explicitly overriding the driver http://computernewb.com/wiki/Install_QEMU_Tablet_Driver_on_Windows_98 For other hardware I had luck with pcnet network card, AC97 sound (SB16 works too but it tends to block mouse during the sound, probably some PIO/interrupt whatever stuff that is very emulation heavy. For AC97 it was really hard to find a working driver, but eventually I found some Win95 old style driver (not the newer WDM drivers that just don't work). It was really fun weekend, few months ago when I set the thing up :-) Best regards, Maxim Levitsky
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
> cd1bfd5ef336166b275a09dc9842542bf5e63ae3 is the first bad commit Unfortunately this is a commit related to SeaBIOS submodule. This commit only update the built BIOS roms. The commits before this one are the ones modifying SeaBIOS, justifying roms to be rebuilt: eda553a442 seabios: enable ide dma 429d3ae2c8 seabios: update submodule to release 1.11.2 The first one (enable ide dma) is a change in the config. You can rebuild the BIOS image and bisect around this commit. You can rebuild the SeaBIOS image running this command in QEMU source repository: $ make -C roms bios This will update 'pc-bios/bios.bin' which you use while bisecting. The second one update the SeaBIOS submodule from commit 0551a4be2c to commit f9626ccb91. These are not so many commits, so the bisect won't be painful: $ git log --oneline 0551a4be2~..f9626ccb91 f9626cc (tag: rel-1.11.2) cbvga_set_mode: refine clear display logic f88297a qemu: add qemu ramfb support a2e4001 vgasrc: add allocate_pmm() 17b01f4 pmm: use tmp zone on oom 44b17d0 bochs_display_setup: return error on failure 4ba61fa cbvga_set_mode: disable clearmem in windows x86 emulator. dd69189 cbvga_list_modes: don't list current mode twice 5f0e7c9 cbvga_setup_modes: use real mode number instead of 0x140 961f67c qemu: add bochs-display support 767365e cbvga: factor out cbvga_setup_modes() 7906460 optionrom: enable non-vga display devices 0551a4b (tag: rel-1.11.1) paravirt: Only enable sercon in NOGRAPHIC mode if no other console specified I recommend doing your bisection using 2 terminals: - one in QEMU source, running 'make -C roms bios' to rebuild 'pc- bios/bios.bin' and run QEMU installing your image, - one in roms/seabios/ where you run the 'git bisect' commands. Note, you don't have to rebuild QEMU. Alternatively, using a single terminal, you can stand in the roms/seabios/ directory, bisect and run 'make -C .. bios'. In this case it might be useful to run QEMU with -L ../../pc-bios to specify the path to the generated bios.bin. You are close, good luck! -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
I tried reverting that commit on top of master but it did not help, so I'm guessing it broke yet again (differently) somewhere else. I'll try reverting cd1bfd5 on top of the very next commit and bisect from there to master, and see where that takes me. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
Just finished a bisect between cfcca36 (working) and current master (not working), here is the result: $ git bisect bad cd1bfd5ef336166b275a09dc9842542bf5e63ae3 is the first bad commit commit cd1bfd5ef336166b275a09dc9842542bf5e63ae3 Author: Gerd Hoffmann Date: Wed Jun 20 12:17:34 2018 +0200 seabios: update bios and vgabios binaries Adds two new vgabios binaries, for ramfb and bochs-display. Signed-off-by: Gerd Hoffmann pc-bios/bios-256k.bin | Bin 262144 -> 262144 bytes pc-bios/bios.bin | Bin 131072 -> 131072 bytes pc-bios/vgabios-bochs-display.bin | Bin 0 -> 27648 bytes pc-bios/vgabios-cirrus.bin| Bin 38400 -> 38400 bytes pc-bios/vgabios-qxl.bin | Bin 38912 -> 38912 bytes pc-bios/vgabios-ramfb.bin | Bin 0 -> 28160 bytes pc-bios/vgabios-stdvga.bin| Bin 38912 -> 38912 bytes pc-bios/vgabios-virtio.bin| Bin 38912 -> 38912 bytes pc-bios/vgabios-vmware.bin| Bin 38912 -> 38912 bytes pc-bios/vgabios.bin | Bin 38400 -> 38400 bytes 10 files changed, 0 insertions(+), 0 deletions(-) create mode 100644 pc-bios/vgabios-bochs-display.bin create mode 100644 pc-bios/vgabios-ramfb.bin -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
Re: [Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
20.08.2019. 23.56, "Brad Parker" <1819...@bugs.launchpad.net> је написао/ла: > > So it looks like even though that commit fixed it, it seems to break > again (differently) in 3.0.0, so I'll need to do another bisect between > cfcca36 and v3.0.0 then I guess. And keep working my way up to master as > well. > > -- At least you will have an interesting debugging story to tell afterwards. I wish you luck! Aleksandar > You received this bug notification because you are a member of qemu- > devel-ml, which is subscribed to QEMU. > https://bugs.launchpad.net/bugs/1819289 > > Title: > Windows 95 and Windows 98 will not install or run > > Status in QEMU: > New > > Bug description: > The last version of QEMU I have been able to run Windows 95 or Windows > 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will > either not install or will not run 95 or 98 at all. I have tried every > combination of options like isapc or no isapc, cpu pentium or cpu as > 486. Tried different memory configurations, but they just don't work > anymore. > > To manage notifications about this bug go to: > https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions >
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
So it looks like even though that commit fixed it, it seems to break again (differently) in 3.0.0, so I'll need to do another bisect between cfcca36 and v3.0.0 then I guess. And keep working my way up to master as well. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
e3af7c788b73a6495 was indeed one of the bad commits I tested during the bisect. If I apply cfcca361d77142f25f on top of it, Windows starts up normally instead of giving me a BSOD on bootup. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
If your bisect hit e3af7c788b73a6495 can you try it with cfcca361d77142f25f applied on top? That commit fixed a bug in e3af7c788b73a6495 which may be throwing off your bisection results. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
Hopefully third time's the charm. I ran yet another bisect, between 2.5.0 (working) and 2.11.0 (not working), this time reinstalling the entire OS from scratch with a blank disk every single time. Results: $ git bisect good e3af7c788b73a6495eb9d94992ef11f6ad6f3c56 is the first bad commit commit e3af7c788b73a6495eb9d94992ef11f6ad6f3c56 Author: Paolo Bonzini Date: Wed Apr 26 13:59:34 2017 +0200 target/i386: introduce x86_ld*_code These take care of advancing s->pc, and will provide a unified point where to check for the 15-byte instruction length limit. Signed-off-by: Paolo Bonzini target/i386/translate.c | 228 ++-- 1 file changed, 125 insertions(+), 103 deletions(-) -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
Yep, these types of bugs don't necessarily bisect cleanly if they're todo with code layout or dirty memory. Still, it's good to keep a note of the earliest patches that you find a failure on - because then we know it must be somewhere before that. I remember there was a problem reported booting FreeDOS as well; and I've got to wonder if it's related. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
Just FYI that was the second bisect I had to do, the first time it produced an even more unrelated commit, so I assumed I must have done something wrong... apparently that is still the case. After trying the "working" commit outside of the Docker container, it now does not work... so I'm at a loss as to how to reliably bisect I guess. Never had any issues with other projects doing it though. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
I am not using anything related to migration, just launching with a simple flat qcow2 file, no snapshots, backing stores or anything like that. The host is Archlinux x64 but I'm running inside of a docker container that runs Ubuntu 18.04. The command-line is: qemu-system-i386 -spice port=5800,disable-ticketing=on -cpu pentium -m 128 -vga std -no-kvm -hda Win95C.qcow2 -nodefaults -no-hpet -no-acpi -cdrom Win95C.iso -nodefaults -M isapc -monitor stdio -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
On 8/19/19 7:26 PM, Brad Parker wrote: > Whoops, 3.11.0 does not exist. Went back and did a full bisect. 3.0.0 > works fine, and the breakage starts before 3.0.1 and 3.1.0 was released, > specifically, with commit 05306935b1ae49107c2dc2f301574dd6c29b6838. This commit is migration related. Are you trying to restore/launch a pre-installed image? John reported "either not install or will not run 95 or 98 at all" but you report "95 just reboots infinitely after trying to boot from HDD after the initial setup." which is slighly different. What host/os/distrib are you using? What command line are you using to start QEMU? If you are using migration, I wonder if the following commit might affect here: commit 341ba0df4c69269cac839ddbacb2a0ca641a856d Author: Peter Maydell Date: Tue Sep 25 17:19:24 2018 +0100 migration/ram.c: Avoid taking address of fields in packed MultiFDInit_t struct Taking the address of a field in a packed struct is a bad idea, because it might not be actually aligned enough for that pointer type (and thus cause a crash on dereference on some host architectures). Newer versions of clang warn about this: Avoid the bug by not using the "modify in place" byteswapping functions. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
Whoops, 3.11.0 does not exist. Went back and did a full bisect. 3.0.0 works fine, and the breakage starts before 3.0.1 and 3.1.0 was released, specifically, with commit 05306935b1ae49107c2dc2f301574dd6c29b6838. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions
[Qemu-devel] [Bug 1819289] Re: Windows 95 and Windows 98 will not install or run
I was able to get both running on 3.11.0, but something broke again by the time I re-tested on 4.0.0. 98 seems to work on 4.0 at least, but 95 just reboots infinitely after trying to boot from HDD after the initial setup. I tried searching their mailing list and asking around but nobody seems interested in fixing it. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1819289 Title: Windows 95 and Windows 98 will not install or run Status in QEMU: New Bug description: The last version of QEMU I have been able to run Windows 95 or Windows 98 on was 2.7 or 2.8. Recent versions since then even up to 3.1 will either not install or will not run 95 or 98 at all. I have tried every combination of options like isapc or no isapc, cpu pentium or cpu as 486. Tried different memory configurations, but they just don't work anymore. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1819289/+subscriptions