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Re: [Xen-devel] [PATCH v14 9/9] mm / iommu: split need_iommu() into has_iommu_pt() and need_iommu_pt_sync()
- To: Paul Durrant <paul.durrant@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Thu, 4 Oct 2018 17:23:21 +0100
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- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, 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>, Julien Grall <julien.grall@xxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Brian Woods <brian.woods@xxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
- Delivery-date: Thu, 04 Oct 2018 16:23:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 10/04/2018 11:45 AM, Paul Durrant wrote:
> The name 'need_iommu()' is a little confusing as it suggests a domain needs
> to use the IOMMU but something might not be set up yet, when in fact it
> represents a tri-state value (not a boolean as might be expected) where
> -1 means 'IOMMU mappings being set up' and 1 means 'IOMMU mappings have
> been fully set up'.
>
> Two different meanings are also inferred from the macro it in various
> places in the code:
>
> - Some callers want to test whether a domain has IOMMU mappings at all
> - Some callers want to test whether they need to synchronize the domain's
> P2M and IOMMU mappings
>
> This patch replaces the 'need_iommu' tri-state value with a defined
> enumeration and adds a boolean flag 'need_sync' to separate these meanings,
> and places both of these in struct domain_iommu, rather than directly in
> struct domain.
> This patch also creates two new boolean macros:
>
> - 'has_iommu_pt()' evaluates to true if a domain has IOMMU mappings, even
> if they are still under construction.
> - 'need_iommu_pt_sync()' evaluates to true if a domain requires explicit
> synchronization of the P2M and IOMMU mappings.
>
> All callers of need_iommu() are then modified to use the macro appropriate
> to what they are trying to test, except for the instance in
> xen/drivers/passthrough/pci.c:assign_device() which has simply been
> removed since it appears to be unnecessary.
>
> NOTE: There are some callers of need_iommu() that strictly operate on
> the hardware domain. In some of these case a more global flag is
> used instead.
>
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Acked-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
Wow -- looks like good work:
x86/p2m bits:
Acked-by: George Dunlap <george.dunlap@xxxxxxxxxx>
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