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iommu: Add iommu_group_has_isolated_msi()

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Compute the isolated_msi over all the devices in the IOMMU group because
iommufd and vfio both need to know that the entire group is isolated
before granting access to it.

Link: https://lore.kernel.org/r/2-v3-3313bb5dd3a3+10f11-secure_msi_jgg@nvidia.com
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe 2022-12-09 13:23:08 -04:00
parent 17cde5e601
commit efc30a8f15
2 changed files with 27 additions and 0 deletions
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26
drivers/iommu/iommu.c
View file

@ -30,6 +30,7 @@
#include <linux/cc_platform.h>
#include <trace/events/iommu.h>
#include <linux/sched/mm.h>
#include <linux/msi.h>
#include "dma-iommu.h"
@ -1897,6 +1898,31 @@ bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
}
EXPORT_SYMBOL_GPL(device_iommu_capable);
/**
* iommu_group_has_isolated_msi() - Compute msi_device_has_isolated_msi()
* for a group
* @group: Group to query
*
* IOMMU groups should not have differing values of
* msi_device_has_isolated_msi() for devices in a group. However nothing
* directly prevents this, so ensure mistakes don't result in isolation failures
* by checking that all the devices are the same.
*/
bool iommu_group_has_isolated_msi(struct iommu_group *group)
{
struct group_device *group_dev;
bool ret = true;
mutex_lock(&group->mutex);
list_for_each_entry(group_dev, &group->devices, list) {
ret &= msi_device_has_isolated_msi(group_dev->dev) ||
device_iommu_capable(group_dev->dev, IOMMU_CAP_INTR_REMAP);
}
mutex_unlock(&group->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_group_has_isolated_msi);
/**
* iommu_set_fault_handler() - set a fault handler for an iommu domain
* @domain: iommu domain

1
include/linux/iommu.h
View file

@ -455,6 +455,7 @@ static inline const struct iommu_ops *dev_iommu_ops(struct device *dev)
extern int bus_iommu_probe(struct bus_type *bus);
extern bool iommu_present(struct bus_type *bus);
extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
extern struct iommu_group *iommu_group_get_by_id(int id);
extern void iommu_domain_free(struct iommu_domain *domain);