Re: [PATCH 5/5] KVM: VMX: Always honor guest PAT on CPUs that support self-snoop

[Sean Christopherson]

On Fri, Aug 30, 2024, Vitaly Kuznetsov wrote:
> Gerd Hoffmann <kraxel@xxxxxxxxxx> writes:
> 
> >> Necroposting!
> >> 
> >> Turns out that this change broke "bochs-display" driver in QEMU even
> >> when the guest is modern (don't ask me 'who the hell uses bochs for
> >> modern guests', it was basically a configuration error :-). E.g:
> >
> > qemu stdvga (the default display device) is affected too.
> >
> 
> So far, I was only able to verify that the issue has nothing to do with
> OVMF and multi-vcpu, it reproduces very well with
> 
> $ qemu-kvm -machine q35,accel=kvm,kernel-irqchip=split -name guest=c10s
> -cpu host -smp 1 -m 16384 -drive file=/var/lib/libvirt/images/c10s-bios.qcow2,if=none,id=drive-ide0-0-0
> -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1
> -vnc :0 -device VGA -monitor stdio --no-reboot
> 
> Comparing traces of working and broken cases, I couldn't find anything
> suspicious but I may had missed something of course. For now, it seems
> like a userspace misbehavior resulting in a segfault.

Guest userspace?