lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <ZtHOr-kCqvCdUc_A@google.com>
Date: Fri, 30 Aug 2024 06:52:47 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: Gerd Hoffmann <kraxel@...hat.com>, Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org, 
	rcu@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Kevin Tian <kevin.tian@...el.com>, Yan Zhao <yan.y.zhao@...el.com>, 
	Yiwei Zhang <zzyiwei@...gle.com>, Lai Jiangshan <jiangshanlai@...il.com>, 
	"Paul E. McKenney" <paulmck@...nel.org>, Josh Triplett <josh@...htriplett.org>
Subject: Re: [PATCH 5/5] KVM: VMX: Always honor guest PAT on CPUs that support self-snoop

On Fri, Aug 30, 2024, Vitaly Kuznetsov wrote:
> Gerd Hoffmann <kraxel@...hat.com> 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?

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ