Re: [Xen-devel] Shattering superpages impact on IOMMU in Xen

[Julien Grall <julien.grall@xxxxxxx>]

Hi Oleksandr,

Please try to configure the mail client to quote with '>'. Using tab for 
quoting make it quite difficult to follow.
On 04/06/2017 09:36 PM, Oleksandr Tyshchenko wrote:
> 6 апр. 2017 г. 22:22 пользователь "Julien Grall" <julien.grall@xxxxxxx
> <mailto:julien.grall@xxxxxxx>> написал:
>     If the IOMMU is not able to snoop the cache, then the way forward is
>     to use a clean_dcache operation after writing a page table entry.
>     This is how we deal in the p2m code.
>
> Agree.
>
> As we update page table in an atomic way (no BBM sequence) and the
> reason caused page faults was found, I think that the IPMMU driver can
> declare superpage capability?
Yes for the IPMMU driver. Although we would have to do some things for 
the SMMU driver.
Cheers,

--
Julien Grall

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