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PCI: vmd: Revert 2565e5b69c ("PCI: vmd: Do not disable MSI-X remapping if interrupt remapping is enabled by IOMMU.")

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Revert 2565e5b69c ("PCI: vmd: Do not disable MSI-X remapping if
interrupt remapping is enabled by IOMMU.")

The commit 2565e5b69c was added as a workaround to keep MSI-X
remapping enabled if IOMMU enables interrupt remapping. VMD would keep
running in low performance mode. There is no dependency between MSI-X
remapping by VMD and interrupt remapping by IOMMU.

Link: https://lore.kernel.org/r/20220511095707.25403-3-nirmal.patel@linux.intel.com
Signed-off-by: Nirmal Patel <nirmal.patel@linux.intel.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Nirmal Patel 2022-05-11 02:57:07 -07:00 committed by Lorenzo Pieralisi
parent 886e67100b
commit c94f732e80
1 changed files with 1 additions and 3 deletions
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4
drivers/pci/controller/vmd.c
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@ -6,7 +6,6 @@
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/iommu.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
@ -813,8 +812,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
* acceptable because the guest is usually CPU-limited and MSI
* remapping doesn't become a performance bottleneck.
*/
if (iommu_capable(vmd->dev->dev.bus, IOMMU_CAP_INTR_REMAP) ||
!(features & VMD_FEAT_CAN_BYPASS_MSI_REMAP) ||
if (!(features & VMD_FEAT_CAN_BYPASS_MSI_REMAP) ||
offset[0] || offset[1]) {
ret = vmd_alloc_irqs(vmd);
if (ret)