linux-kernel - Re: commit f8f559422b (KVM: MMU: fast invalidate all mmio sptes) causes hang

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 17 Jul 2013 19:42:32 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	kvm@...r.kernel.org,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: commit f8f559422b (KVM: MMU: fast invalidate all mmio sptes)
 causes hang

On Wed, Jul 17, 2013 at 06:32:15PM +0200, Markus Trippelsdorf wrote:
> The following commit:
>  commit f8f559422b6c6a05469dfde614b67789b6142cb5
>  Author: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
>  Date:   Fri Jun 7 16:51:26 2013 +0800
> 
>     KVM: MMU: fast invalidate all mmio sptes
> 
> causes my kvm qemu qcow2 images to hang when they switch from the boot
> console to the desktop. For example:
>  qemu-system-x86_64 -enable-kvm -net nic,vlan=0,model=virtio -net user -drive file=ubuntu,if=virtio,cache=unsafe -smp 2 -m 1024
> boots normally at first, but then hangs as soon as Xorg gets started.`
> 
Which guest is is exactly and how reproducible is this?

> Perf top shows:
>  20.99%  [kernel]                                  [k] svm_vcpu_run
>  17.24%  [kernel]                                  [k] handle_mmio_page_fault_common
>  15.61%  [kernel]                                  [k] kvm_arch_vcpu_ioctl_run
>  12.49%  [kernel]                                  [k] fast_page_fault.part.78
> 
> I'm running:
> QEMU emulator version 1.4.2 
> on an AMD PhenomII X4 CPU.
> 
What is the output of "cat /proc/cpuinfo"?

--
			Gleb.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/