Subject: Re: [PATCH v3] drivers/virtio: Enable virtio mem for ARM64

From: "Michael S. Tsirkin" <[email-masked]>
Date: Fri, 4 Feb 2022 09:04:26 -0500

On Fri, Feb 04, 2022 at 02:29:39PM +0100, David Hildenbrand wrote:
> On 04.02.22 14:24, Michael S. Tsirkin wrote:
> > On Wed, Jan 19, 2022 at 09:35:05AM +0100, David Hildenbrand wrote:
> >> On 19.01.22 08:46, Gavin Shan wrote:
> >>> Hi Michael,
> >>>
> >>> On 1/19/22 3:39 PM, Michael S. Tsirkin wrote:
> >>>> On Wed, Jan 19, 2022 at 09:05:51AM +0800, Gavin Shan wrote:
> >>>>> This enables virtio-mem device support by allowing to enable the
> >>>>> corresponding kernel config option (CONFIG_VIRTIO_MEM) on the
> >>>>> architecture.
> >>>>>
> >>>>> Signed-off-by: Gavin Shan <[email-masked]>
> >>>>> Acked-by: David Hildenbrand <[email-masked]>
> >>>>> Acked-by: Jonathan Cameron <[email-masked]>
> >>>>> Acked-by: Michael S. Tsirkin <[email-masked]>
> >>>>> ---
> >>>>> v3: Pick ack-by tags from Jonathan and Michael
> >>>>> ---
> >>>>>   drivers/virtio/Kconfig | 7 ++++---
> >>>>>   1 file changed, 4 insertions(+), 3 deletions(-)
> >>>>>
> >>>>> diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
> >>>>> index 34f80b7a8a64..74c8b0c7bc33 100644
> >>>>> --- a/drivers/virtio/Kconfig
> >>>>> +++ b/drivers/virtio/Kconfig
> >>>>> @@ -106,7 +106,7 @@ config VIRTIO_BALLOON
> >>>>>   config VIRTIO_MEM
> >>>>>   	tristate "Virtio mem driver"
> >>>>>   	default m
> >>>>> -	depends on X86_64
> >>>>> +	depends on X86_64 || ARM64
> >>>>>   	depends on VIRTIO
> >>>>>   	depends on MEMORY_HOTPLUG
> >>>>>   	depends on MEMORY_HOTREMOVE
> >>>>> @@ -116,8 +116,9 @@ config VIRTIO_MEM
> >>>>>   	 This driver provides access to virtio-mem paravirtualized memory
> >>>>>   	 devices, allowing to hotplug and hotunplug memory.
> >>>>>   
> >>>>> -	 This driver was only tested under x86-64, but should theoretically
> >>>>> -	 work on all architectures that support memory hotplug and hotremove.
> >>>>> +	 This driver was only tested under x86-64 and arm64, but should
> >>>>> +	 theoretically work on all architectures that support memory hotplug
> >>>>> +	 and hotremove.
> >>>>>   
> >>>>
> >>>> BTW isn't there a symbol saying "memory hotplug" that we can depend on?
> >>>>
> >>
> >> You mean
> >>
> >>  	depends on MEMORY_HOTPLUG
> >>  	depends on MEMORY_HOTREMOVE
> >>
> >> We still need a manual opt-in from architectures, because devil's in the
> >> detail. (e.g., memblock stuff we had to adjust)
> > 
> > Is there any chance of documenting some of this here? The current comment makes it
> > look like it's just a question of whitelisting an architecture.
> 
> I can send a patch to add more details.

oks so that will be a patch on top?

> -- 
> Thanks,
> David / dhildenb

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