From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Heiko Carstens <heiko.carstens-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
Andrew Morton <akpm-3NddpPZAyC0@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 08/15] KVM: Add method to check for backwards-compatible API extensions
Date: Sun, 18 Mar 2007 10:20:44 +0200 [thread overview]
Message-ID: <45FCF65C.2070800@qumranet.com> (raw)
In-Reply-To: <20070316150622.GC8525-Pmgahw53EmNLmI7Nx2oIsGnsbthNF6/HVpNB7YpNyf8@public.gmane.org>
Heiko Carstens wrote:
>> diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
>> index 747966e..376538c 100644
>> --- a/drivers/kvm/kvm_main.c
>> +++ b/drivers/kvm/kvm_main.c
>> @@ -2416,6 +2416,12 @@ static long kvm_dev_ioctl(struct file *filp,
>> r = 0;
>> break;
>> }
>> + case KVM_CHECK_EXTENSION:
>> + /*
>> + * No extensions defined at present.
>> + */
>> + r = 0;
>> + break;
>> default:
>>
>
> What exactly is this good for?
>
Extending the interface in a backwards compatible manner. When new
interfaces are added, it will return 1 (depending on arg) for
implemented extensions.
--
error compiling committee.c: too many arguments to function
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next prev parent reply other threads:[~2007-03-18 8:20 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-11 13:53 [PATCH 0/15] KVM userspace interface updates Avi Kivity
[not found] ` <11736212072915-git-send-email-avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-11 13:53 ` [PATCH 01/15] KVM: Use a shared page for kernel/user communication when runing a vcpu Avi Kivity
[not found] ` <1173621207773-git-send-email-avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-15 2:38 ` Hollis Blanchard
2007-03-15 3:09 ` [kvm-devel] " Hollis Blanchard
2007-03-11 13:53 ` [PATCH 02/15] KVM: Do not communicate to userspace through cpu registers during PIO Avi Kivity
2007-03-11 13:53 ` [PATCH 03/15] KVM: Initialize PIO I/O count Avi Kivity
2007-03-11 13:53 ` [PATCH 04/15] KVM: Handle cpuid in the kernel instead of punting to userspace Avi Kivity
2007-03-11 13:53 ` [PATCH 05/15] KVM: Remove the 'emulated' field from the userspace interface Avi Kivity
2007-03-11 13:53 ` [PATCH 06/15] KVM: Remove minor wart from KVM_CREATE_VCPU ioctl Avi Kivity
2007-03-11 13:53 ` [PATCH 07/15] KVM: Renumber ioctls Avi Kivity
2007-03-11 13:53 ` [PATCH 08/15] KVM: Add method to check for backwards-compatible API extensions Avi Kivity
2007-03-16 15:06 ` [kvm-devel] " Heiko Carstens
[not found] ` <20070316150622.GC8525-Pmgahw53EmNLmI7Nx2oIsGnsbthNF6/HVpNB7YpNyf8@public.gmane.org>
2007-03-18 8:20 ` Avi Kivity [this message]
2007-03-11 13:53 ` [PATCH 09/15] KVM: Allow userspace to process hypercalls which have no kernel handler Avi Kivity
2007-03-11 13:53 ` [PATCH 10/15] KVM: Fold kvm_run::exit_type into kvm_run::exit_reason Avi Kivity
2007-03-11 13:53 ` [PATCH 11/15] KVM: Add a special exit reason when exiting due to an interrupt Avi Kivity
2007-03-11 13:53 ` [PATCH 12/15] KVM: Initialize the apic_base msr on svm too Avi Kivity
2007-03-11 13:53 ` [PATCH 13/15] KVM: Add guest mode signal mask Avi Kivity
2007-03-11 13:53 ` [PATCH 14/15] KVM: Allow kernel to select size of mmap() buffer Avi Kivity
2007-03-11 13:53 ` [PATCH 15/15] KVM: Future-proof argument-less ioctls Avi Kivity
2007-03-16 8:36 ` [PATCH 0/15] KVM userspace interface updates Heiko Carstens
2007-03-16 14:03 ` [kvm-devel] " Anthony Liguori
2007-03-16 15:01 ` Heiko Carstens
2007-03-18 10:42 ` Avi Kivity
[not found] ` <45FD1778.6030602-7k6+44Jx4zn6gbPvEgmw2w@public.gmane.org>
2007-03-19 15:43 ` Heiko Carstens
[not found] ` <20070319154311.GB8331-Pmgahw53EmNLmI7Nx2oIsGnsbthNF6/HVpNB7YpNyf8@public.gmane.org>
2007-03-19 16:02 ` Avi Kivity
2007-03-19 16:37 ` [kvm-devel] " Heiko Carstens
[not found] ` <45FEB431.8030504-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-19 17:49 ` Avi Kivity
[not found] ` <20070316083650.GA8525-Pmgahw53EmNLmI7Nx2oIsGnsbthNF6/HVpNB7YpNyf8@public.gmane.org>
2007-03-18 5:20 ` Avi Kivity
[not found] ` <45FCCC39.7090104-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-18 10:22 ` Heiko Carstens
2007-03-18 10:32 ` [kvm-devel] " Avi Kivity
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