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iommu/vt-d: Don't disable IR when it was previously enabled
Keep it enabled in kdump kernel to guarantee interrupt delivery. Tested-by: ZhenHua Li <zhen-hual@hp.com> Tested-by: Baoquan He <bhe@redhat.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -742,9 +742,6 @@ static int __init intel_prepare_irq_remapping(void)
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pr_info("%s does not support EIM\n", iommu->name);
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eim = 0;
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}
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/* Disable IRQ remapping if it is already enabled */
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iommu_disable_irq_remapping(iommu);
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}
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eim_mode = eim;
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@ -777,7 +774,8 @@ static int __init intel_enable_irq_remapping(void)
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* Setup Interrupt-remapping for all the DRHD's now.
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*/
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for_each_iommu(iommu, drhd) {
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iommu_enable_irq_remapping(iommu);
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if (!ir_pre_enabled(iommu))
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iommu_enable_irq_remapping(iommu);
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setup = true;
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}
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