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According to the Intel VT-d specification, an IOMMU m= ight support multiple AGAW values. The AGAW value for each device is set in the device context entry, however there's a caveat related to the value the field supports depending on the translation type: "When the Translation-type (T) field indicates pass-through (010b) or guest-mode (100b or 101b), this field must be programmed to indicate the largest AGAW value supported by hardware." Of the translation types listed above Xen only uses pass-through (010b), and hence we need to make sure the context entry AGAW field is set appropriatel= y, or else the IOMMU will report invalid context entry errors. To do so calculate the IOMMU supported page table levels based on the last = bit set in the SAGAW field, instead of the first one. This also allows making = use of the widest address width supported by the IOMMU, in case multiple AGAWs = are supported. Note that 859d11b27912 claims to replace the open-coded find_first_set_bit(= ), but it's actually replacing an open coded implementation to find the last s= et bit. Fixes: 859d11b27912 ('VT-d: prune SAGAW recognition') Signed-off-by: Roger Pau Monn=C3=A9 --- xen/drivers/passthrough/vtd/iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/= vtd/iommu.c index ceef7359e553..be60d7573dae 100644 --- a/xen/drivers/passthrough/vtd/iommu.c +++ b/xen/drivers/passthrough/vtd/iommu.c @@ -1328,7 +1328,7 @@ int __init iommu_alloc(struct acpi_drhd_unit *drhd) /* Calculate number of pagetable levels: 3 or 4. */ sagaw =3D cap_sagaw(iommu->cap); if ( sagaw & 6 ) - agaw =3D find_first_set_bit(sagaw & 6); + agaw =3D fls(sagaw & 6) - 1; if ( !agaw ) { printk(XENLOG_ERR VTDPREFIX "IOMMU: unsupported sagaw %x\n", sagaw= ); --=20 2.42.0