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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e49a6a2173
When the userspace requests a small TCE table (which takes less than the system page size) and more than 1 TCE level, the existing code returns a single page size which is a bug as each additional TCE level requires at least one page and this is what pnv_pci_ioda2_table_alloc_pages() does. And we end up seeing WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size)) in drivers/vfio/vfio_iommu_spapr_tce.c. This replaces incorrect _ALIGN_UP() (which aligns zero up to zero) with max_t() to fix the bug. Besides removing WARN_ON(), there should be no other changes in behaviour. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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