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    Subject[v8 9/9] iommu, x86: Properly handler PI for IOMMU hotplug
    Date
    Return error when inserting a new IOMMU which doesn't support PI
    if PI is currently in use.

    Signed-off-by: Feng Wu <feng.wu@intel.com>
    ---
    drivers/iommu/intel_irq_remapping.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
    index c21a2a9..1f35d0b 100644
    --- a/drivers/iommu/intel_irq_remapping.c
    +++ b/drivers/iommu/intel_irq_remapping.c
    @@ -1363,6 +1363,9 @@ int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
    return -EINVAL;
    if (!ecap_ir_support(iommu->ecap))
    return 0;
    + if (irq_remapping_cap(IRQ_POSTING_CAP) &&
    + !cap_pi_support(iommu->cap))
    + return -EBUSY;

    if (insert) {
    if (!iommu->ir_table)
    --
    2.1.0


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