linux-kernel - Re: [less-CONFIG_NET 7/7] kvm: drop CONFIG

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Message-ID: <3f98f2be-47e1-ecf1-ff3c-0b35ae93437a@amazon.de>
Date:   Thu, 7 Jun 2018 17:48:23 +0200
From:   Norbert Manthey <nmanthey@...zon.de>
To:     Paolo Bonzini <pbonzini@...hat.com>
CC:     Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
        <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [less-CONFIG_NET 7/7] kvm: drop CONFIG_NET

Dear Paolo,

after you asked, I run a few more "make randconfig; make" rounds, and
found a problem with one of the commits (when using BPF_SYSCALL, NET and
SECCOMP_FILTER). I'll fix the issues and all other that might pop up,
and rerun the randconfig loop many more times to get a better coverage
and higher confidence. I'll update the series afterwards.

Best,
Norbert


On 06/07/2018 01:46 PM, Norbert Manthey wrote:
> On 06/07/2018 01:20 PM, Paolo Bonzini wrote:
>> On 06/06/2018 15:53, Norbert Manthey wrote:
>>> In some scenarios, we do not want to use CONFIG_NET even though we want
>>> to use CONFIG_KVM. To get this working, and to not pull in more
>>> dependencies, we need to disable CONFIG_TASKSTATS as well.
>>>
>>> Signed-off-by: Norbert Manthey <nmanthey@...zon.de>
>>> ---
>>>  arch/x86/kvm/Kconfig | 5 ++---
>>>  1 file changed, 2 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
>>> index 92fd433..f209817 100644
>>> --- a/arch/x86/kvm/Kconfig
>>> +++ b/arch/x86/kvm/Kconfig
>>> @@ -22,8 +22,8 @@ config KVM
>>>  	tristate "Kernel-based Virtual Machine (KVM) support"
>>>  	depends on HAVE_KVM
>>>  	depends on HIGH_RES_TIMERS
>>> -	# for TASKSTATS/TASK_DELAY_ACCT:
>>> -	depends on NET && MULTIUSER
>>> +	# TASK_DELAY_ACCT:
>>> +	depends on MULTIUSER
>>>  	depends on X86_LOCAL_APIC
>>>  	select PREEMPT_NOTIFIERS
>>>  	select MMU_NOTIFIER
>>> @@ -37,7 +37,6 @@ config KVM
>>>  	select KVM_ASYNC_PF
>>>  	select USER_RETURN_NOTIFIER
>>>  	select KVM_MMIO
>>> -	select TASKSTATS
>>>  	select TASK_DELAY_ACCT
>>>  	select PERF_EVENTS
>>>  	select HAVE_KVM_MSI
>>>
>> Assuming it compiles, it looks good. :)
>>
>> Paolo
>>
> It compiles, with the default configuration, as well as with the subset
> that I currently use. Since I have an actually small selection of config
> options, I wonder whether there is some best practices to make sure this
> change does not corrupt other configurations that rely on KVM selecting
> TASKSTATS.
>
> Norbert

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