linux-kernel - Re: [PATCH V2] vhost: do not enable VHOST

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Message-ID: <fdb555a6-4b8d-15b6-0849-3fe0e0786038@redhat.com>
Date:   Fri, 17 Apr 2020 16:39:49 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, geert@...ux-m68k.org,
        tsbogend@...ha.franken.de, benh@...nel.crashing.org,
        paulus@...ba.org, heiko.carstens@...ibm.com, gor@...ux.ibm.com,
        borntraeger@...ibm.com, Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH V2] vhost: do not enable VHOST_MENU by default


On 2020/4/17 下午4:29, Michael S. Tsirkin wrote:
> On Fri, Apr 17, 2020 at 03:36:52PM +0800, Jason Wang wrote:
>> On 2020/4/17 下午2:33, Michael S. Tsirkin wrote:
>>> On Fri, Apr 17, 2020 at 11:12:14AM +0800, Jason Wang wrote:
>>>> On 2020/4/17 上午6:55, Michael S. Tsirkin wrote:
>>>>> On Wed, Apr 15, 2020 at 10:43:56AM +0800, Jason Wang wrote:
>>>>>> We try to keep the defconfig untouched after decoupling CONFIG_VHOST
>>>>>> out of CONFIG_VIRTUALIZATION in commit 20c384f1ea1a
>>>>>> ("vhost: refine vhost and vringh kconfig") by enabling VHOST_MENU by
>>>>>> default. Then the defconfigs can keep enabling CONFIG_VHOST_NET
>>>>>> without the caring of CONFIG_VHOST.
>>>>>>
>>>>>> But this will leave a "CONFIG_VHOST_MENU=y" in all defconfigs and even
>>>>>> for the ones that doesn't want vhost. So it actually shifts the
>>>>>> burdens to the maintainers of all other to add "CONFIG_VHOST_MENU is
>>>>>> not set". So this patch tries to enable CONFIG_VHOST explicitly in
>>>>>> defconfigs that enables CONFIG_VHOST_NET and CONFIG_VHOST_VSOCK.
>>>>>>
>>>>>> Acked-by: Christian Borntraeger<borntraeger@...ibm.com>  (s390)
>>>>>> Acked-by: Michael Ellerman<mpe@...erman.id.au>  (powerpc)
>>>>>> Cc: Thomas Bogendoerfer<tsbogend@...ha.franken.de>
>>>>>> Cc: Benjamin Herrenschmidt<benh@...nel.crashing.org>
>>>>>> Cc: Paul Mackerras<paulus@...ba.org>
>>>>>> Cc: Michael Ellerman<mpe@...erman.id.au>
>>>>>> Cc: Heiko Carstens<heiko.carstens@...ibm.com>
>>>>>> Cc: Vasily Gorbik<gor@...ux.ibm.com>
>>>>>> Cc: Christian Borntraeger<borntraeger@...ibm.com>
>>>>>> Reported-by: Geert Uytterhoeven<geert@...ux-m68k.org>
>>>>>> Signed-off-by: Jason Wang<jasowang@...hat.com>
>>>>> I rebased this on top of OABI fix since that
>>>>> seems more orgent to fix.
>>>>> Pushed to my vhost branch pls take a look and
>>>>> if possible test.
>>>>> Thanks!
>>>> I test this patch by generating the defconfigs that wants vhost_net or
>>>> vhost_vsock. All looks fine.
>>>>
>>>> But having CONFIG_VHOST_DPN=y may end up with the similar situation that
>>>> this patch want to address.
>>>> Maybe we can let CONFIG_VHOST depends on !ARM || AEABI then add another
>>>> menuconfig for VHOST_RING and do something similar?
>>>>
>>>> Thanks
>>> Sorry I don't understand. After this patch CONFIG_VHOST_DPN is just
>>> an internal variable for the OABI fix. I kept it separate
>>> so it's easy to revert for 5.8. Yes we could squash it into
>>> VHOST directly but I don't see how that changes logic at all.
>>
>> Sorry for being unclear.
>>
>> I meant since it was enabled by default, "CONFIG_VHOST_DPN=y" will be left
>> in the defconfigs.
> But who cares?


FYI, please see https://www.spinics.net/lists/kvm/msg212685.html


> That does not add any code, does it?


It doesn't.

Thanks


>
>> This requires the arch maintainers to add
>> "CONFIG_VHOST_VDPN is not set". (Geert complains about this)
>>
>> Thanks
>>
>>