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Merge branch 'iommu/guest-msi' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into arm/core

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This commit is contained in:
Joerg Roedel 2017-01-30 15:58:47 +01:00
commit 93fa6cf60a
14 changed files with 590 additions and 93 deletions
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37
drivers/vfio/vfio_iommu_type1.c
View file

@ -38,6 +38,8 @@
#include <linux/workqueue.h>
#include <linux/mdev.h>
#include <linux/notifier.h>
#include <linux/dma-iommu.h>
#include <linux/irqdomain.h>
#define DRIVER_VERSION "0.2"
#define DRIVER_AUTHOR "Alex Williamson <[email protected]>"
@ -1179,6 +1181,28 @@ static struct vfio_group *find_iommu_group(struct vfio_domain *domain,
return NULL;
}
static bool vfio_iommu_has_resv_msi(struct iommu_group *group,
phys_addr_t *base)
{
struct list_head group_resv_regions;
struct iommu_resv_region *region, *next;
bool ret = false;
INIT_LIST_HEAD(&group_resv_regions);
iommu_get_group_resv_regions(group, &group_resv_regions);
list_for_each_entry(region, &group_resv_regions, list) {
if (region->type & IOMMU_RESV_MSI) {
*base = region->start;
ret = true;
goto out;
}
}
out:
list_for_each_entry_safe(region, next, &group_resv_regions, list)
kfree(region);
return ret;
}
static int vfio_iommu_type1_attach_group(void *iommu_data,
struct iommu_group *iommu_group)
{
@ -1187,6 +1211,8 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
struct vfio_domain *domain, *d;
struct bus_type *bus = NULL, *mdev_bus;
int ret;
bool resv_msi, msi_remap;
phys_addr_t resv_msi_base;
mutex_lock(&iommu->lock);
@ -1256,11 +1282,15 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
if (ret)
goto out_domain;
resv_msi = vfio_iommu_has_resv_msi(iommu_group, &resv_msi_base);
INIT_LIST_HEAD(&domain->group_list);
list_add(&group->next, &domain->group_list);
if (!allow_unsafe_interrupts &&
!iommu_capable(bus, IOMMU_CAP_INTR_REMAP)) {
msi_remap = resv_msi ? irq_domain_check_msi_remap() :
iommu_capable(bus, IOMMU_CAP_INTR_REMAP);
if (!allow_unsafe_interrupts && !msi_remap) {
pr_warn("%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
__func__);
ret = -EPERM;
@ -1302,6 +1332,9 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
if (ret)
goto out_detach;
if (resv_msi && iommu_get_msi_cookie(domain->domain, resv_msi_base))
goto out_detach;
list_add(&domain->next, &iommu->domain_list);
mutex_unlock(&iommu->lock);