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authorJoerg Roedel <jroedel@suse.de>2017-01-30 15:58:47 +0100
committerJoerg Roedel <jroedel@suse.de>2017-01-30 15:58:47 +0100
commit93fa6cf60aad833e7572a61f98b2d0aa6f67de40 (patch)
tree3e64532eec9aebf95827854b9a79d12676d49a3c /drivers/vfio
parent566cf877a1fcb6d6dc0126b076aad062054c2637 (diff)
parent5018c8d5ef0c172592eb98cf10e253d47b544ba8 (diff)
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Merge branch 'iommu/guest-msi' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into arm/core
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/vfio_iommu_type1.c37
1 files changed, 35 insertions, 2 deletions
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index b3cc33fa6d26..0f353f519574 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -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 <alex.williamson@redhat.com>"
@@ -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);