[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Xen-users] Grant Table Access By Multiple Domains
So is there any way to achieve what I am trying to do? I realize that it may take several grants, but my issue right now is that each grant is a different page. I want several grants to all grant the same page to several other domains.
I would think this is possible, I don't see why the grant table mechanism would be limited to one shared domain.
Regards,
Dagaen Golomb
On Mar 23, 2016 7:55 AM, "Roger Pau Monné" < roger.pau@xxxxxxxxxx> wrote: On Tue, 22 Mar 2016, Dagaen Golomb wrote:
> Hello,
>
> I have written two user-space applications. One gets a grant from Xen
> and writes some data to a page. The other maps the page and reads the
> data. I am using the userspace grant table mechanism
> (gntalloc/gntdev).
>
> They work perfectly for transfers between two domains. However, I
> would like to set up a global memory page, where multiple guests can
> all simultaneously map the same page. Right now, it appears I can only
> pass in one domid when using gntalloc, and when I change the domain
> and issue the IOCTL again this results in a separate grant (and I
> presume, page). This makes sense since they are logically two
> different grant requests.
>
> Is there a way I can allow more than one domain to map the same
> granted page? For example, Instead of granting a page to just domid 1,
> I'd like to say domid's 1, 2, and 3 can all map it simultaneously.
> Thanks for any help and insight.
No, AFAIK you will have to create several grants in order to give
permissions to different domains. Grants are a way to share memory between
2 domains (so it's a 1:1 sharing), but not amongst multiple domains (1:N).
Roger.
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users
|
