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According to the Intel VT-d specification,= an IOMMU can report multiple SAGAW bits being set. Commit 859d11b27912 claims to replace the open-coded find_first_set_bit(), = but it's actually replacing an open coded implementation to find the last set b= it. The change forces the used AGAW to the lowest supported by the IOMMU instea= d of the highest one between 1 and 2. Restore the previous SAGAW parsing by using fls() instead of find_first_set_bit(), in order to get the highest (supported) AGAW to be us= ed. However there's a caveat related to the value the AW context entry field mu= st be set to when using passthrough mode: "When the Translation-type (TT) field indicates pass-through processing (10= b), this field must be programmed to indicate the largest AGAW value supported = by hardware." [0] Newer Intel IOMMU implementations support 5 level page tables for the IOMMU, and signal such support in SAGAW bit 3. Enabling 5 level paging support (AGAW 3) at this point in the release is too risky, so instead put a bodge to unconditionally disable passthough mode if SAGAW has any bits greater than 2 set. Ignore bit 0, it's reserved in the specification but unlikely to have any meaning in the future. Note the message about unhandled SAGAW bits being set is printed unconditionally, regardless of whether passthrough mode is enabled. This is done in order to easily notice IOMMU implementations with not yet supported SAGAW values. [0] Intel VT Directed Spec Rev 4.1 Fixes: 859d11b27912 ('VT-d: prune SAGAW recognition') Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich --- Changes since v1: - Reword commit message - Put a bodge for SAGAW bit 3. --- xen/drivers/passthrough/vtd/iommu.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/= vtd/iommu.c index ceef7359e553..d2211ecc0b1b 100644 --- a/xen/drivers/passthrough/vtd/iommu.c +++ b/xen/drivers/passthrough/vtd/iommu.c @@ -1327,15 +1327,24 @@ int __init iommu_alloc(struct acpi_drhd_unit *drhd) =20 /* 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); - if ( !agaw ) + agaw =3D fls(sagaw & 6) - 1; + if ( agaw =3D=3D -1 ) { printk(XENLOG_ERR VTDPREFIX "IOMMU: unsupported sagaw %x\n", sagaw= ); print_iommu_regs(drhd); rc =3D -ENODEV; goto free; } + if ( sagaw >> 3 ) + { + printk_once(XENLOG_WARNING VTDPREFIX + "IOMMU: unhandled bits set in sagaw (%#x)%s\n", + sagaw, + iommu_hwdom_passthrough ? " disabling passthrough" : "= " ); + if ( iommu_hwdom_passthrough ) + iommu_hwdom_passthrough =3D false; + } + iommu->nr_pt_levels =3D agaw_to_level(agaw); if ( min_pt_levels > iommu->nr_pt_levels ) min_pt_levels =3D iommu->nr_pt_levels; --=20 2.42.0