On a Wednesday in 2023, Michal Privoznik wrote:
In vir-host-validate we do two checks related to IOMMU: 1) hardware support, and 2) kernel support. While users are usually interested in the latter, the former also makes sense. And for the former (hardware support) we have this huge if-else block for nearly every architecture, except ARM. Now, IOMMU is called SMMU in ARM world, and while there's certainly a definitive way of detecting SMMU support (e.g. via dumping some registers in asm), we can work around this - just like we do for Intel and AMD - and check for an ACPI table presence. In ARM world, there's I/O Remapping Table (IORT) which describes SMMU capabilities on given host and is exposed in sysfs (regardless of arm_smmu module). Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2178885 Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx> --- tools/virt-host-validate-common.c | 9 +++++++++ 1 file changed, 9 insertions(+)
Reviewed-by: Ján Tomko <jtomko@xxxxxxxxxx> Jano
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