Author: Wei Liu <[hidden email]>
AuthorDate: Tue Oct 9 15:57:08 2018 +0100
Commit: Wei Liu <[hidden email]>
CommitDate: Thu Oct 11 09:33:46 2018 +0100
x86/vtd: fix IOMMU share PT destruction path
Commit 2916951c1 ("mm / iommu: include need_iommu() test in
iommu_use_hap_pt()") included need_iommu() in iommu_use_hap_pt and
91d4eca7add ("mm / iommu: split need_iommu() into has_iommu_pt() and
need_iommu_pt_sync()") made things finer grain by spliting need_iommu
into three states.
The destruction path can't use iommu_use_hap_pt because at the point
platform op is called, IOMMU is either already switched to or has
always been in disabled state, and the shared PT test would always be
- if ( iommu_use_hap_pt(d) )
+ * We can't use iommu_use_hap_pt here because either IOMMU state
+ * is already changed to IOMMU_STATUS_disabled at this point or
+ * has always been IOMMU_STATUS_disabled.
+ * We also need to test if HAP is enabled because PV guests can
+ * enter this path too.
+ if ( hap_enabled(d) && iommu_hap_pt_share )
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