Re: Fixed Mirage

["Vincent B." <vb@xxxxxxxxxxxxxx>]

On 11/07/2013 23:48, Anil Madhavapeddy wrote:
> Hm, this is still pretty broken and crashes immediately on boot with
> master/:
>
> https://github.com/mirage/mirage-platform/commit/ab88ef636fe3ff06c8638d5ea765ad25bf9610e2
Whas crashes exactly ? the basic example with DHCP was working well for
me when I commited those changes…

> Why did you remove the zeroing of the Io_pages?  That breaks
> everything and the domain crashes as so> on as any shared rings are
> used, since there is garbage on the ring at start.  I added a
> memset(block, 0, len) into alloc_pages, and the domain now boots ok,
> but I still see a lot of packet loss.  Investigating...
But I added the zeroing in the first place!!! Previously there was no 
zeroing at all, I then added it but removed it after I observed that the 
pages returned by memalign were actually always zeroed.
I had the impression that Xen would always zero the pages in order for 
domains not to be able to see other domains memory…
I'm a bit confused by what's happening I have to admit!

Vincent