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virt-host-validate: Detect SMMU support on ARMs

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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@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Michal Privoznik 2023-03-22 16:33:32 +01:00
parent 1f76b5365e
commit 2c13a2a7c9
1 changed files with 9 additions and 0 deletions
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9
tools/virt-host-validate-common.c
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@ -388,6 +388,15 @@ int virHostValidateIOMMU(const char *hvname,
return VIR_HOST_VALIDATE_FAILURE(VIR_HOST_VALIDATE_NOTE);
}
virHostMsgPass();
} else if (ARCH_IS_ARM(arch)) {
if (access("/sys/firmware/acpi/tables/IORT", F_OK) == 0) {
virHostMsgPass();
} else {
virHostMsgFail(level,
"No ACPI IORT table found, IOMMU not "
"supported by this hardware platform");
return VIR_HOST_VALIDATE_FAILURE(level);
}
} else {
virHostMsgFail(level,
"Unknown if this platform has IOMMU support");