From: Avi Kivity <avi@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: mtosatti@redhat.com, kvm@vger.kernel.org
Subject: Re: [PATCH RFC] KVM: inject #UD if instruction emulation fails while vcpu is in cpl==3
Date: Thu, 06 May 2010 12:15:58 +0300 [thread overview]
Message-ID: <4BE288CE.5050801@redhat.com> (raw)
In-Reply-To: <20100429115847.GW10044@redhat.com>
On 04/29/2010 02:58 PM, Gleb Natapov wrote:
> Do not kill VM If instruction emulation fails while vcpu is in
> userspace. Inject #UD instead in a hope that guest OS will kill offending
> process. Emulation failure is still traced by ftrace point to help
> analyze the problem.
>
Still there's the risk here that a critical failure goes unnoticed.
ftrace isn't on at all times.
We can probably inject a #UD unconditionally and exit to userspace.
Userspace would then report the problem to the user and reenter the
guest, which would then recover or not.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2010-05-06 9:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-29 11:58 [PATCH RFC] KVM: inject #UD if instruction emulation fails while vcpu is in cpl==3 Gleb Natapov
2010-05-06 9:15 ` Avi Kivity [this message]
2010-05-06 10:06 ` Gleb Natapov
2010-05-06 10:13 ` Avi Kivity
2010-05-06 12:25 ` Gleb Natapov
2010-05-06 12:33 ` Avi Kivity
2010-05-06 12:41 ` Gleb Natapov
2010-05-06 12:48 ` Avi Kivity
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