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From: Anthony PERARD <anthony.perard@citrix.com>
To: Paul Durrant <paul.durrant@citrix.com>
Cc: "Stefano Stabellini" <sstabellini@kernel.org>,
	"Wei Liu" <wl@xen.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
	"George Dunlap" <George.Dunlap@eu.citrix.com>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Ian Jackson" <ian.jackson@eu.citrix.com>,
	"Tim Deegan" <tim@xen.org>, "Julien Grall" <julien.grall@arm.com>,
	"Christian Lindig" <christian.lindig@citrix.com>,
	"Jan Beulich" <jbeulich@suse.com>,
	"David Scott" <dave@recoil.org>,
	xen-devel@lists.xenproject.org,
	"Volodymyr Babchuk" <Volodymyr_Babchuk@epam.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH v13 4/4] introduce a 'passthrough' configuration option to xl.cfg...
Date: Wed, 18 Sep 2019 16:20:06 +0100	[thread overview]
Message-ID: <20190918152006.GO1308@perard.uk.xensource.com> (raw)
In-Reply-To: <20190918104113.3294-5-paul.durrant@citrix.com>

On Wed, Sep 18, 2019 at 11:41:13AM +0100, Paul Durrant wrote:
> ...and hence the ability to disable IOMMU mappings, and control EPT
> sharing.
> 
> This patch introduces a new 'libxl_passthrough' enumeration into
> libxl_domain_create_info. The value will be set by xl either when it parses
> a new 'passthrough' option in xl.cfg, or implicitly if there is passthrough
> hardware specified for the domain.
> 
> If the value of the passthrough configuration option is 'disabled' then
> the XEN_DOMCTL_CDF_iommu flag will be clear in the xen_domctl_createdomain
> flags, thus allowing the toolstack to control whether the domain gets
> IOMMU mappings or not (where previously they were globally set).
> 
> If the value of the passthrough configuration option is 'sync_pt' then
> a new 'iommu_opts' field in xen_domctl_createdomain will be set with the
> value XEN_DOMCTL_IOMMU_no_sharept. This will override the global default
> set in iommu_hap_pt_share, thus allowing the toolstack to control whether
> EPT sharing is used for the domain.
> 
> If the value of passthrough is 'enabled' then xl will choose an appropriate
> default according to the type of domain and hardware support.
> 
> NOTE: The 'iommu_memkb' overhead in libxl_domain_build_info will now only
>       be set if passthrough is 'sync_pt' (or xl has chosen this mode as
>       a default).
> 
> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
> Reviewed-by: Jan Beulich <jbeulich@suse.com>
> Acked-by: Christian Lindig <christian.lindig@citrix.com>
> Acked-by: Julien Grall <julien.grall@arm.com>

Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

Thanks,

-- 
Anthony PERARD

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  reply	other threads:[~2019-09-18 15:20 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-18 10:41 [Xen-devel] [PATCH v13 0/4] add per-domain IOMMU control Paul Durrant
2019-09-18 10:41 ` [Xen-devel] [PATCH v13 1/4] remove late (on-demand) construction of IOMMU page tables Paul Durrant
2019-09-25  9:00   ` Paul Durrant
2019-09-25  9:16   ` Wei Liu
2019-09-18 10:41 ` [Xen-devel] [PATCH v13 2/4] iommu: tidy up iommu_use_hap_pt() and need_iommu_pt_sync() macros Paul Durrant
2019-09-18 10:41 ` [Xen-devel] [PATCH v13 3/4] tools/ocaml: abi check: Cope with consecutive relevant enums Paul Durrant
2019-09-18 10:41 ` [Xen-devel] [PATCH v13 4/4] introduce a 'passthrough' configuration option to xl.cfg Paul Durrant
2019-09-18 15:20   ` Anthony PERARD [this message]
2019-09-25  8:40 ` [Xen-devel] [PATCH v13 0/4] add per-domain IOMMU control Paul Durrant
2019-09-25  8:50   ` Jan Beulich
2019-09-25  8:56     ` Paul Durrant
2019-09-25 15:49       ` Oleksandr
2019-09-25 15:55         ` Paul Durrant
2019-09-25 16:03         ` Paul Durrant
2019-09-25 16:04           ` Paul Durrant
2019-09-25 16:14           ` Oleksandr
2019-09-25 16:10         ` Paul Durrant
2019-09-25 16:24           ` Oleksandr
2019-09-25 18:07             ` Oleksandr
2019-09-26  8:32               ` Paul Durrant
2019-09-25 21:34           ` Julien Grall
2019-09-26  8:39             ` Paul Durrant
2019-09-26  9:13               ` Julien Grall
2019-09-26  9:17                 ` Paul Durrant
2019-09-26  9:26                   ` Julien Grall
2019-09-26  9:22               ` Oleksandr

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