Commit c327e423 authored by Zhangfei Gao's avatar Zhangfei Gao Committed by Kunkun Jiang
Browse files

iommufd: modify iommufd_fault_iopf_enable limitation 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IB4WDJ


CVE: NA

--------------------------------

iommufd_fault_iopf_enable has limitation to PRI on PCI/SRIOV VFs
because the PRI might be a shared resource and current iommu
subsystem is not ready to support enabling/disabling PRI on a VF
without any impact on others.

However, we have devices that appear as PCI but are actually on the
AMBA bus. These fake PCI devices have PASID capability, support
stall as well as SRIOV, so remove the limitation for these devices.

Co-developed-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarZhangfei Gao <zhangfei.gao@linaro.org>
Reviewed-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarKunkun Jiang <jiangkunkun@huawei.com>
parent bc182b82

drivers/iommu/iommufd/fault.c

+7 −2
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/pci.h>

#include <linux/pci-ats.h>

#include <linux/poll.h>

#include <uapi/linux/iommufd.h>
@@ -27,8 +28,12 @@ static int iommufd_fault_iopf_enable(struct iommufd_device *idev) 
	 * resource between PF and VFs. There is no coordination for this

	 * shared capability. This waits for a vPRI reset to recover.

	 */

	if (dev_is_pci(dev) && to_pci_dev(dev)->is_virtfn)

	if (dev_is_pci(dev)) {

		struct pci_dev *pdev = to_pci_dev(dev);



		if (pdev->is_virtfn && pci_pri_supported(pdev))

			return -EINVAL;

	}



	mutex_lock(&idev->iopf_lock);

	/* Device iopf has already been on. */