Re: [Xen-devel] [RFC 02/22] xen/arm: p2m: Store in p2m_domain whether we need to clean the entry

2016-08-31 Thread Julien Grall
Hi Stefano, On 16/08/16 01:35, Stefano Stabellini wrote: On Thu, 28 Jul 2016, Julien Grall wrote: Each entry in the page table has to table clean when the IOMMU does not What does it mean to "table clean" ? I meant "has to be cleaned". support coherent walk. Rather than querying every

Re: [Xen-devel] [RFC 02/22] xen/arm: p2m: Store in p2m_domain whether we need to clean the entry

2016-08-15 Thread Stefano Stabellini
On Thu, 28 Jul 2016, Julien Grall wrote: > Each entry in the page table has to table clean when the IOMMU does not What does it mean to "table clean" ? > support coherent walk. Rather than querying every time the page table is > updated, it is possible to do it only once when the p2m is initiali

[Xen-devel] [RFC 02/22] xen/arm: p2m: Store in p2m_domain whether we need to clean the entry

2016-07-28 Thread Julien Grall
Each entry in the page table has to table clean when the IOMMU does not support coherent walk. Rather than querying every time the page table is updated, it is possible to do it only once when the p2m is initialized. This is because this value can never change, Xen would be in big trouble otherwis