From: "Jan Beulich" <JBeulich@suse.com>
To: Paul Durrant <paul.durrant@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Wei Liu <wei.liu2@citrix.com>,
xen-devel <xen-devel@lists.xenproject.org>,
Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: [PATCH v2 4/4] x86/mm/p2m: stop checking for IOMMU shared page tables in mmio_order()
Date: Tue, 04 Dec 2018 08:20:37 -0700 [thread overview]
Message-ID: <5C069B450200007800202C22@prv1-mh.provo.novell.com> (raw)
In-Reply-To: <20181203174017.11956-5-paul.durrant@citrix.com>
>>> On 03.12.18 at 18:40, <paul.durrant@citrix.com> wrote:
> Now that the iommu_map() and iommu_unmap() operations take an order
> parameter and elide flushing there's no strong reason why modifying MMIO
> ranges in the p2m should be restricted to a 4k granularity simply because
> the IOMMU is enabled but shared page tables are not in operation.
I'm afraid the two improvements are not enough for this restriction
to be lifted: There's still no preemption in the processing of the
higher order values.
Jan
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next prev parent reply other threads:[~2018-12-04 15:20 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-03 17:40 [PATCH v2 0/4] iommu improvements Paul Durrant
2018-12-03 17:40 ` [PATCH v2 1/4] amd-iommu: add flush iommu_ops Paul Durrant
2018-12-04 14:24 ` Jan Beulich
2018-12-04 14:56 ` Paul Durrant
2018-12-03 17:40 ` [PATCH v2 2/4] iommu: rename wrapper functions Paul Durrant
2018-12-04 14:51 ` Jan Beulich
2018-12-04 15:00 ` Paul Durrant
2018-12-03 17:40 ` [PATCH v2 3/4] iommu: elide flushing for higher order map/unmap operations Paul Durrant
2018-12-04 15:16 ` Jan Beulich
2018-12-04 15:36 ` Paul Durrant
2018-12-04 16:01 ` Jan Beulich
2018-12-04 16:53 ` Paul Durrant
2018-12-04 17:20 ` Jan Beulich
2018-12-03 17:40 ` [PATCH v2 4/4] x86/mm/p2m: stop checking for IOMMU shared page tables in mmio_order() Paul Durrant
2018-12-04 15:20 ` Jan Beulich [this message]
2018-12-04 15:22 ` Paul Durrant
2018-12-04 15:36 ` Jan Beulich
2018-12-04 15:51 ` Jan Beulich
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