From: Avi Kivity <avi@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [PATCH 4/4] KVM: x86: Add VCPU substate for NMI states
Date: Sun, 25 Oct 2009 15:11:36 +0200 [thread overview]
Message-ID: <4AE44E88.4000603@redhat.com> (raw)
In-Reply-To: <4AD7070D.7070108@siemens.com>
On 10/15/2009 01:27 PM, Jan Kiszka wrote:
>
>> Perhaps it makes sense to query about individual states, including
>> existing ones? That will allow us to deprecate and then phase out
>> broken states. It's probably not worth it.
>>
> You may do this already with the given design: Set up a VCPU, then issue
> KVM_GET_VCPU_STATE on the substate in question. You will either get an
> error code or 0 if the substate is supported. At least no additional
> kernel code required.
>
No, if some code requires a feature, we don't want to set up a guest and
a vcpu and issue dummy commands in order to find out if we can actually
run that code.
Feature discovery needs to be a 'system ioctl' in the words of
Documentation/kvm/api.txt.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-10-25 13:11 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-13 16:06 [PATCH 0/4] Extensible VCPU state IOCTL Jan Kiszka
2009-10-13 16:06 ` [PATCH 2/4] KVM: Add unified KVM_GET/SET_VCPU_STATE IOCTL Jan Kiszka
2009-10-15 8:00 ` Avi Kivity
2009-10-15 9:22 ` Jan Kiszka
2009-10-15 9:33 ` Avi Kivity
2009-10-15 8:07 ` Avi Kivity
2009-10-15 9:22 ` Jan Kiszka
2009-10-15 8:11 ` Avi Kivity
2009-10-15 9:22 ` Jan Kiszka
2009-10-15 14:54 ` Glauber Costa
2009-10-15 15:57 ` Glauber Costa
2009-10-15 16:06 ` Jan Kiszka
2009-10-15 16:23 ` Glauber Costa
2009-10-13 16:06 ` [PATCH 4/4] KVM: x86: Add VCPU substate for NMI states Jan Kiszka
2009-10-15 8:09 ` Avi Kivity
2009-10-15 9:22 ` Jan Kiszka
2009-10-15 9:29 ` Avi Kivity
2009-10-15 11:27 ` Jan Kiszka
2009-10-25 13:11 ` Avi Kivity [this message]
2009-10-26 7:40 ` Jan Kiszka
2009-10-13 16:06 ` [PATCH 3/4] KVM: x86: Add support for KVM_GET/SET_VCPU_STATE Jan Kiszka
2009-10-13 16:06 ` [PATCH 1/4] KVM: Reorder IOCTLs in main kvm.h Jan Kiszka
2009-10-13 16:18 ` [RFC][PATCH] kvm: x86: Add support for KVM_GET/PUT_VCPU_STATE Jan Kiszka
2009-10-14 8:52 ` [PATCH] qemu-kvm: x86: Add support for NMI states Jan Kiszka
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