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[PATCH for-4.20? 1/3] AMD/IOMMU: drop stray MSI enabling
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 30 Jan 2025 12:11:52 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Thu, 30 Jan 2025 11:11:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
While the 2nd of the commits referenced below should have moved the call
to amd_iommu_msi_enable() instead of adding another one, the situation
wasn't quite right even before: It can't have done any good to enable
MSI when no IRQ was allocated for it, yet.
Fixes: 5f569f1ac50e ("AMD/IOMMU: allow enabling with IRQ not yet set up")
Fixes: d9e49d1afe2e ("AMD/IOMMU: adjust setup of internal interrupt for x2APIC
mode")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/drivers/passthrough/amd/iommu_init.c
+++ b/xen/drivers/passthrough/amd/iommu_init.c
@@ -902,8 +902,6 @@ static void enable_iommu(struct amd_iomm
}
}
- amd_iommu_msi_enable(iommu, IOMMU_CONTROL_ENABLED);
-
set_iommu_ht_flags(iommu);
set_iommu_command_buffer_control(iommu, IOMMU_CONTROL_ENABLED);
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