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Re: [Xen-devel] [PATCH v11.1 3/6] sysctl / libxl: report whether IOMMU/HAP page table sharing is supported
- To: Jan Beulich <jbeulich@xxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Julien Grall <julien.grall@xxxxxxx>
- Date: Tue, 17 Sep 2019 10:36:12 +0100
- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, WeiLiu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Christian Lindig <christian.lindig@xxxxxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, David Scott <dave@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 17 Sep 2019 09:36:19 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Jan,
On 9/13/19 12:10 PM, Jan Beulich wrote:
This patch defines a new bit reported in the hw_cap field of struct
xen_sysctl_physinfo to indicate whether the platform supports sharing of
HAP page tables (i.e. the P2M) with the IOMMU. This informs the toolstack
whether the domain needs extra memory to store discrete IOMMU page tables
or not.
NOTE: This patch makes sure iommu_hap_pt_shared is clear if HAP is not
supported or the IOMMU is disabled, and defines it to false if
!CONFIG_HVM.
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Christian Lindig <christian.lindig@xxxxxxxxxx>
For the common code:
Acked-by: Julien Grall <julien.grall@xxxxxxx>
Cheers,
--
Julien Grall
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