Re: [Xen-devel] [PATCH v2] xen/iommu: fix usage of shared EPT/IOMMU page tables on PVH guests

[Roger Pau Monnà <roger.pau@xxxxxxxxxx>]

El 09/03/15 a les 4.30, Tian, Kevin ha escrit:
>> From: Roger Pau Monne [mailto:roger.pau@xxxxxxxxxx]
>> Sent: Friday, February 27, 2015 7:34 PM
>>
>> iommu_share_p2m_table should not prevent PVH guests from using a shared
>> page
>> table between the IOMMU and EPT. Clean the code by removing the asserts in
>> the vendor specific implementations (amd_iommu_share_p2m,
>> iommu_set_pgd),
>> and moving the hap_enabled assert to the caller (iommu_share_p2m_table).
>>
>> Also fix another incorrect usage of is_hvm_domain usage in
>> arch_iommu_populate_page_table. This has not given problems so far
>> because
>> all the pages in PVH guests are of type PGT_writable_page.
>>
>> Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
>> Cc: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
>> Cc: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx>
>> Cc: Jan Beulich <jbeulich@xxxxxxxx>
>> Cc: Yang Zhang <yang.z.zhang@xxxxxxxxx>
>> Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
> 
> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
> 
> btw, does this patch fix your earlier iommu faults with PVH Dom0?

Yes, it fixes booting a PVH Dom0 on hosts that share the page tables
between EPT and the IOMMU(s).

Roger.

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