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

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Date:   Fri, 17 Apr 2020 11:12:14 +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 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