From: Paolo Bonzini <pbonzini@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>, Bandan Das <bsd@redhat.com>,
kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
Wanpeng Li <wanpeng.li@linux.intel.com>,
Gleb Natapov <gleb@kernel.org>
Subject: Re: [PATCH] KVM: x86: Check for nested events if there is an injectable interrupt
Date: Tue, 08 Jul 2014 10:00:35 +0200 [thread overview]
Message-ID: <53BBA523.4080006@redhat.com> (raw)
In-Reply-To: <53BB9638.6040803@siemens.com>
Il 08/07/2014 08:56, Jan Kiszka ha scritto:
> I don't think arch.nmi_pending can flip asynchronously, only in the
> context of the VCPU thread - in contrast to pending IRQ states.
Right, only nmi_queued is changed from other threads. /me should really
look at the code instead of going from memory.
>> Jan, what do you think? Can you run Jailhouse through this patch?
>
> Jailhouse seems fine with it, and it resolves the lockup of nested KVM
> here as well.
Thinking more about it, I think this is the right fix. Not setting
KVM_REQ_EVENT in some cases can be an optimization, but it's not
necessary. Definitely there are other cases in which KVM_REQ_EVENT is
set even though no event is pending---most notably during emulation of
invalid guest state.
Paolo
next prev parent reply other threads:[~2014-07-08 8:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-08 4:30 [PATCH] KVM: x86: Check for nested events if there is an injectable interrupt Bandan Das
2014-07-08 5:50 ` Paolo Bonzini
2014-07-08 6:56 ` Jan Kiszka
2014-07-08 8:00 ` Paolo Bonzini [this message]
2014-07-08 9:26 ` Wanpeng Li
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