Re: H_CLEAR_REF and H_CLEAR_MOD

[Nathan Whitehorn <nwhitehorn@freebsd.org>]

On 02/18/15 15:33, Nathan Whitehorn wrote:
>
> On 02/18/15 14:00, Paul Mackerras wrote:
>> On Wed, Feb 18, 2015 at 09:34:54AM +0100, Alexander Graf wrote:
>>>> Am 18.02.2015 um 07:12 schrieb Nathan Whitehorn 
>>>> <nwhitehorn@freebsd.org>:
>>>>
>>>> It seems like KVM doesn't implement the H_CLEAR_REF and H_CLEAR_MOD 
>>>> hypervisor calls, which are absolutely critical for memory 
>>>> management in the FreeBSD kernel (and are marked "mandatory" in the 
>>>> PAPR manual). It seems some patches have been contributed already 
>>>> in 
>>>> https://lists.ozlabs.org/pipermail/linuxppc-dev/2011-December/095013.html, 
>>>> so it would be fantastic if these could end up upstream.
>>> Paul, I guess we never included this because  there was no user. If 
>>> FreeBSD does use it though, I think it makes a lot of sense to 
>>> resend it for inclusion.
>> I agree.  I just need to check the locking and synchronization around
>> the reference and change bit recording, then I'll resend it.
>
> Thanks much! Please let me know if I can help at all with this.

Any news on this? I'm happy to test the patch if you like.
-Nathan