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charset="utf-8" domain_pgd_maddr() contains logic to adjust the root address to be put in the context entry in case 4-level page tables aren't supported by an IOMMU. This logic may not be bypassed when sharing page tables. Fixes: 25ccd093425c ("iommu: remove the share_p2m operation") Signed-off-by: Jan Beulich --- a/xen/drivers/passthrough/vtd/iommu.c +++ b/xen/drivers/passthrough/vtd/iommu.c @@ -340,19 +340,21 @@ static uint64_t domain_pgd_maddr(struct { pagetable_t pgt =3D p2m_get_pagetable(p2m_get_hostp2m(d)); =20 - return pagetable_get_paddr(pgt); + pgd_maddr =3D pagetable_get_paddr(pgt); } - - if ( !hd->arch.vtd.pgd_maddr ) + else { - /* Ensure we have pagetables allocated down to leaf PTE. */ - addr_to_dma_page_maddr(d, 0, 1); - if ( !hd->arch.vtd.pgd_maddr ) - return 0; - } + { + /* Ensure we have pagetables allocated down to leaf PTE. */ + addr_to_dma_page_maddr(d, 0, 1); =20 - pgd_maddr =3D hd->arch.vtd.pgd_maddr; + if ( !hd->arch.vtd.pgd_maddr ) + return 0; + } + + pgd_maddr =3D hd->arch.vtd.pgd_maddr; + } =20 /* Skip top levels of page tables for 2- and 3-level DRHDs. */ for ( agaw =3D level_to_agaw(4);