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RE: [PATCH v7 04/14] IOMMU/x86: new command line option to suppress use of superpage mappings
- To: "Beulich, Jan" <JBeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
- Date: Thu, 7 Jul 2022 02:26:47 +0000
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- Cc: "Cooper, Andrew" <andrew.cooper3@xxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>, Pau Monné, Roger <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 07 Jul 2022 02:27:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHYkG0USa5jTvMMrkiGoFwB656pZa1yMPew
- Thread-topic: [PATCH v7 04/14] IOMMU/x86: new command line option to suppress use of superpage mappings
> From: Jan Beulich <jbeulich@xxxxxxxx>
> Sent: Tuesday, July 5, 2022 8:45 PM
>
> Before actually enabling their use, provide a means to suppress it in
> case of problems. Note that using the option can also affect the sharing
> of page tables in the VT-d / EPT combination: If EPT would use large
> page mappings but the option is in effect, page table sharing would be
> suppressed (to properly fulfill the admin request).
>
> Requested-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
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