From: Avi Kivity <avi@qumranet.com>
To: Jan Kiszka <jan.kiszka@web.de>
Cc: kvm-devel <kvm@vger.kernel.org>,
Hollis Blanchard <hollisb@us.ibm.com>,
Jerone Young <jyoung5@us.ibm.com>,
Joerg Roedel <joerg.roedel@amd.com>
Subject: Re: [PATCH 1/11] QEMU/KVM: Fix deadlocks in monitor and debugger
Date: Tue, 27 May 2008 12:36:51 +0300 [thread overview]
Message-ID: <483BD633.3080302@qumranet.com> (raw)
In-Reply-To: <483B351E.6010305@web.de>
Jan Kiszka wrote:
> Some monitor commands as well as the vm_stop() issued by the gdbstub on
> external interruption so far deadlock on vcpu locks in the kernel. Patch
> below resolves the issue by temporarily or permanently stopping all vcpu
> threads before issuing the related KVM IOCTLs. It enables, e.g., to
> break into guest code spinning in the vcpu and to use things like "info
> cpus" in the monitor.
>
I implemented the alternative on_vcpu() approach for this (similar to
smp_call_function_single in the kernel) which solves the livelock
without resorting to stopping the VM.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2008-05-27 9:36 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-26 22:05 [PATCH 0/11] Rework guest debug interface / x86 debug register support -v2 Jan Kiszka
2008-05-26 22:09 ` [PATCH 1/11] QEMU/KVM: Fix deadlocks in monitor and debugger Jan Kiszka
2008-05-27 9:36 ` Avi Kivity [this message]
2008-05-27 13:00 ` Jan Kiszka
2008-05-27 13:09 ` Avi Kivity
2008-05-26 22:09 ` [PATCH 2/11] QEMU/KVM: Cleanup and improve kvm_load/save_registers usage Jan Kiszka
2008-06-09 19:16 ` Anthony Liguori
2008-06-12 12:38 ` Avi Kivity
2008-05-26 22:09 ` [PATCH 3/11] QEMU/KVM: Proper vm_stop on debug events Jan Kiszka
2008-05-26 22:09 ` [PATCH 4/11] QEMU: Enhance cpu_break/watchpoint API and gdbstub integration Jan Kiszka
2008-05-26 22:10 ` [PATCH 5/11] QEMU: Improve SMP debugging support Jan Kiszka
2008-05-26 22:10 ` [PATCH 6/11] QEMU/KVM: Introduce single vcpu pause/resume Jan Kiszka
2008-05-26 22:10 ` [PATCH 7/11] QEMU/KVM: New guest debugging interface Jan Kiszka
2008-05-27 18:31 ` Jan Kiszka
2008-05-26 22:10 ` [PATCH 8/11] QEMU/KVM: Support for SMP guest debugging Jan Kiszka
2008-05-26 22:10 ` [PATCH 9/11] KVM: New guest debugging interface Jan Kiszka
2008-05-26 22:10 ` [PATCH 10/11] KVM-x86: Properly virtualize debug registers Jan Kiszka
2008-05-26 22:10 ` [PATCH 11/11] KVM-x86: Wire up host-managed " Jan Kiszka
2008-05-27 9:50 ` [PATCH 0/11] Rework guest debug interface / x86 debug register support -v2 Avi Kivity
2008-05-27 10:44 ` Jan Kiszka
2008-05-27 18:46 ` Hollis Blanchard
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