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authorLinus Torvalds <torvalds@linux-foundation.org>2022-06-01 13:49:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-06-01 13:49:15 -0700
commit176882156ae6d63a81fe7f01ea6fe65ab6b52105 (patch)
tree6c5fffb2f2ad707d2abc0b8479bf703483b08f8f /virt/kvm
parent8171acb8bc9b33f3ed827f0615b24f7a06495cd0 (diff)
parent421cfe6596f6cb316991c02bf30a93bd81092853 (diff)
Merge tag 'vfio-v5.19-rc1' of https://github.com/awilliam/linux-vfio
Pull vfio updates from Alex Williamson: - Improvements to mlx5 vfio-pci variant driver, including support for parallel migration per PF (Yishai Hadas) - Remove redundant iommu_present() check (Robin Murphy) - Ongoing refactoring to consolidate the VFIO driver facing API to use vfio_device (Jason Gunthorpe) - Use drvdata to store vfio_device among all vfio-pci and variant drivers (Jason Gunthorpe) - Remove redundant code now that IOMMU core manages group DMA ownership (Jason Gunthorpe) - Remove vfio_group from external API handling struct file ownership (Jason Gunthorpe) - Correct typo in uapi comments (Thomas Huth) - Fix coccicheck detected deadlock (Wan Jiabing) - Use rwsem to remove races and simplify code around container and kvm association to groups (Jason Gunthorpe) - Harden access to devices in low power states and use runtime PM to enable d3cold support for unused devices (Abhishek Sahu) - Fix dma_owner handling of fake IOMMU groups (Jason Gunthorpe) - Set driver_managed_dma on vfio-pci variant drivers (Jason Gunthorpe) - Pass KVM pointer directly rather than via notifier (Matthew Rosato) * tag 'vfio-v5.19-rc1' of https://github.com/awilliam/linux-vfio: (38 commits) vfio: remove VFIO_GROUP_NOTIFY_SET_KVM vfio/pci: Add driver_managed_dma to the new vfio_pci drivers vfio: Do not manipulate iommu dma_owner for fake iommu groups vfio/pci: Move the unused device into low power state with runtime PM vfio/pci: Virtualize PME related registers bits and initialize to zero vfio/pci: Change the PF power state to D0 before enabling VFs vfio/pci: Invalidate mmaps and block the access in D3hot power state vfio: Change struct vfio_group::container_users to a non-atomic int vfio: Simplify the life cycle of the group FD vfio: Fully lock struct vfio_group::container vfio: Split up vfio_group_get_device_fd() vfio: Change struct vfio_group::opened from an atomic to bool vfio: Add missing locking for struct vfio_group::kvm kvm/vfio: Fix potential deadlock problem in vfio include/uapi/linux/vfio.h: Fix trivial typo - _IORW should be _IOWR instead vfio/pci: Use the struct file as the handle not the vfio_group kvm/vfio: Remove vfio_group from kvm vfio: Change vfio_group_set_kvm() to vfio_file_set_kvm() vfio: Change vfio_external_check_extension() to vfio_file_enforced_coherent() vfio: Remove vfio_external_group_match_file() ...
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/vfio.c329
1 files changed, 143 insertions, 186 deletions
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index 8fcbc50221c2..ce1b01d02c51 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -23,7 +23,7 @@
struct kvm_vfio_group {
struct list_head node;
- struct vfio_group *vfio_group;
+ struct file *file;
};
struct kvm_vfio {
@@ -32,118 +32,61 @@ struct kvm_vfio {
bool noncoherent;
};
-static struct vfio_group *kvm_vfio_group_get_external_user(struct file *filep)
+static void kvm_vfio_file_set_kvm(struct file *file, struct kvm *kvm)
{
- struct vfio_group *vfio_group;
- struct vfio_group *(*fn)(struct file *);
+ void (*fn)(struct file *file, struct kvm *kvm);
- fn = symbol_get(vfio_group_get_external_user);
- if (!fn)
- return ERR_PTR(-EINVAL);
-
- vfio_group = fn(filep);
-
- symbol_put(vfio_group_get_external_user);
-
- return vfio_group;
-}
-
-static bool kvm_vfio_external_group_match_file(struct vfio_group *group,
- struct file *filep)
-{
- bool ret, (*fn)(struct vfio_group *, struct file *);
-
- fn = symbol_get(vfio_external_group_match_file);
- if (!fn)
- return false;
-
- ret = fn(group, filep);
-
- symbol_put(vfio_external_group_match_file);
-
- return ret;
-}
-
-static void kvm_vfio_group_put_external_user(struct vfio_group *vfio_group)
-{
- void (*fn)(struct vfio_group *);
-
- fn = symbol_get(vfio_group_put_external_user);
- if (!fn)
- return;
-
- fn(vfio_group);
-
- symbol_put(vfio_group_put_external_user);
-}
-
-static void kvm_vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm)
-{
- void (*fn)(struct vfio_group *, struct kvm *);
-
- fn = symbol_get(vfio_group_set_kvm);
+ fn = symbol_get(vfio_file_set_kvm);
if (!fn)
return;
- fn(group, kvm);
+ fn(file, kvm);
- symbol_put(vfio_group_set_kvm);
+ symbol_put(vfio_file_set_kvm);
}
-static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group)
+static bool kvm_vfio_file_enforced_coherent(struct file *file)
{
- long (*fn)(struct vfio_group *, unsigned long);
- long ret;
+ bool (*fn)(struct file *file);
+ bool ret;
- fn = symbol_get(vfio_external_check_extension);
+ fn = symbol_get(vfio_file_enforced_coherent);
if (!fn)
return false;
- ret = fn(vfio_group, VFIO_DMA_CC_IOMMU);
+ ret = fn(file);
- symbol_put(vfio_external_check_extension);
+ symbol_put(vfio_file_enforced_coherent);
- return ret > 0;
+ return ret;
}
-#ifdef CONFIG_SPAPR_TCE_IOMMU
-static int kvm_vfio_external_user_iommu_id(struct vfio_group *vfio_group)
+static struct iommu_group *kvm_vfio_file_iommu_group(struct file *file)
{
- int (*fn)(struct vfio_group *);
- int ret = -EINVAL;
+ struct iommu_group *(*fn)(struct file *file);
+ struct iommu_group *ret;
- fn = symbol_get(vfio_external_user_iommu_id);
+ fn = symbol_get(vfio_file_iommu_group);
if (!fn)
- return ret;
+ return NULL;
- ret = fn(vfio_group);
+ ret = fn(file);
- symbol_put(vfio_external_user_iommu_id);
+ symbol_put(vfio_file_iommu_group);
return ret;
}
-static struct iommu_group *kvm_vfio_group_get_iommu_group(
- struct vfio_group *group)
-{
- int group_id = kvm_vfio_external_user_iommu_id(group);
-
- if (group_id < 0)
- return NULL;
-
- return iommu_group_get_by_id(group_id);
-}
-
+#ifdef CONFIG_SPAPR_TCE_IOMMU
static void kvm_spapr_tce_release_vfio_group(struct kvm *kvm,
- struct vfio_group *vfio_group)
+ struct kvm_vfio_group *kvg)
{
- struct iommu_group *grp = kvm_vfio_group_get_iommu_group(vfio_group);
+ struct iommu_group *grp = kvm_vfio_file_iommu_group(kvg->file);
if (WARN_ON_ONCE(!grp))
return;
kvm_spapr_tce_release_iommu_group(kvm, grp);
- iommu_group_put(grp);
}
#endif
@@ -163,7 +106,7 @@ static void kvm_vfio_update_coherency(struct kvm_device *dev)
mutex_lock(&kv->lock);
list_for_each_entry(kvg, &kv->group_list, node) {
- if (!kvm_vfio_group_is_coherent(kvg->vfio_group)) {
+ if (!kvm_vfio_file_enforced_coherent(kvg->file)) {
noncoherent = true;
break;
}
@@ -181,149 +124,162 @@ static void kvm_vfio_update_coherency(struct kvm_device *dev)
mutex_unlock(&kv->lock);
}
-static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
+static int kvm_vfio_group_add(struct kvm_device *dev, unsigned int fd)
{
struct kvm_vfio *kv = dev->private;
- struct vfio_group *vfio_group;
struct kvm_vfio_group *kvg;
- int32_t __user *argp = (int32_t __user *)(unsigned long)arg;
- struct fd f;
- int32_t fd;
+ struct file *filp;
int ret;
- switch (attr) {
- case KVM_DEV_VFIO_GROUP_ADD:
- if (get_user(fd, argp))
- return -EFAULT;
-
- f = fdget(fd);
- if (!f.file)
- return -EBADF;
-
- vfio_group = kvm_vfio_group_get_external_user(f.file);
- fdput(f);
+ filp = fget(fd);
+ if (!filp)
+ return -EBADF;
- if (IS_ERR(vfio_group))
- return PTR_ERR(vfio_group);
-
- mutex_lock(&kv->lock);
+ /* Ensure the FD is a vfio group FD.*/
+ if (!kvm_vfio_file_iommu_group(filp)) {
+ ret = -EINVAL;
+ goto err_fput;
+ }
- list_for_each_entry(kvg, &kv->group_list, node) {
- if (kvg->vfio_group == vfio_group) {
- mutex_unlock(&kv->lock);
- kvm_vfio_group_put_external_user(vfio_group);
- return -EEXIST;
- }
- }
+ mutex_lock(&kv->lock);
- kvg = kzalloc(sizeof(*kvg), GFP_KERNEL_ACCOUNT);
- if (!kvg) {
- mutex_unlock(&kv->lock);
- kvm_vfio_group_put_external_user(vfio_group);
- return -ENOMEM;
+ list_for_each_entry(kvg, &kv->group_list, node) {
+ if (kvg->file == filp) {
+ ret = -EEXIST;
+ goto err_unlock;
}
+ }
- list_add_tail(&kvg->node, &kv->group_list);
- kvg->vfio_group = vfio_group;
+ kvg = kzalloc(sizeof(*kvg), GFP_KERNEL_ACCOUNT);
+ if (!kvg) {
+ ret = -ENOMEM;
+ goto err_unlock;
+ }
- kvm_arch_start_assignment(dev->kvm);
+ kvg->file = filp;
+ list_add_tail(&kvg->node, &kv->group_list);
- mutex_unlock(&kv->lock);
+ kvm_arch_start_assignment(dev->kvm);
- kvm_vfio_group_set_kvm(vfio_group, dev->kvm);
+ mutex_unlock(&kv->lock);
- kvm_vfio_update_coherency(dev);
+ kvm_vfio_file_set_kvm(kvg->file, dev->kvm);
+ kvm_vfio_update_coherency(dev);
- return 0;
+ return 0;
+err_unlock:
+ mutex_unlock(&kv->lock);
+err_fput:
+ fput(filp);
+ return ret;
+}
- case KVM_DEV_VFIO_GROUP_DEL:
- if (get_user(fd, argp))
- return -EFAULT;
+static int kvm_vfio_group_del(struct kvm_device *dev, unsigned int fd)
+{
+ struct kvm_vfio *kv = dev->private;
+ struct kvm_vfio_group *kvg;
+ struct fd f;
+ int ret;
- f = fdget(fd);
- if (!f.file)
- return -EBADF;
+ f = fdget(fd);
+ if (!f.file)
+ return -EBADF;
- ret = -ENOENT;
+ ret = -ENOENT;
- mutex_lock(&kv->lock);
+ mutex_lock(&kv->lock);
- list_for_each_entry(kvg, &kv->group_list, node) {
- if (!kvm_vfio_external_group_match_file(kvg->vfio_group,
- f.file))
- continue;
+ list_for_each_entry(kvg, &kv->group_list, node) {
+ if (kvg->file != f.file)
+ continue;
- list_del(&kvg->node);
- kvm_arch_end_assignment(dev->kvm);
+ list_del(&kvg->node);
+ kvm_arch_end_assignment(dev->kvm);
#ifdef CONFIG_SPAPR_TCE_IOMMU
- kvm_spapr_tce_release_vfio_group(dev->kvm,
- kvg->vfio_group);
+ kvm_spapr_tce_release_vfio_group(dev->kvm, kvg);
#endif
- kvm_vfio_group_set_kvm(kvg->vfio_group, NULL);
- kvm_vfio_group_put_external_user(kvg->vfio_group);
- kfree(kvg);
- ret = 0;
- break;
- }
+ kvm_vfio_file_set_kvm(kvg->file, NULL);
+ fput(kvg->file);
+ kfree(kvg);
+ ret = 0;
+ break;
+ }
- mutex_unlock(&kv->lock);
+ mutex_unlock(&kv->lock);
- fdput(f);
+ fdput(f);
- kvm_vfio_update_coherency(dev);
+ kvm_vfio_update_coherency(dev);
- return ret;
+ return ret;
+}
#ifdef CONFIG_SPAPR_TCE_IOMMU
- case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: {
- struct kvm_vfio_spapr_tce param;
- struct kvm_vfio *kv = dev->private;
- struct vfio_group *vfio_group;
- struct kvm_vfio_group *kvg;
- struct fd f;
- struct iommu_group *grp;
+static int kvm_vfio_group_set_spapr_tce(struct kvm_device *dev,
+ void __user *arg)
+{
+ struct kvm_vfio_spapr_tce param;
+ struct kvm_vfio *kv = dev->private;
+ struct kvm_vfio_group *kvg;
+ struct fd f;
+ int ret;
- if (copy_from_user(&param, (void __user *)arg,
- sizeof(struct kvm_vfio_spapr_tce)))
- return -EFAULT;
+ if (copy_from_user(&param, arg, sizeof(struct kvm_vfio_spapr_tce)))
+ return -EFAULT;
- f = fdget(param.groupfd);
- if (!f.file)
- return -EBADF;
+ f = fdget(param.groupfd);
+ if (!f.file)
+ return -EBADF;
- vfio_group = kvm_vfio_group_get_external_user(f.file);
- fdput(f);
+ ret = -ENOENT;
- if (IS_ERR(vfio_group))
- return PTR_ERR(vfio_group);
+ mutex_lock(&kv->lock);
- grp = kvm_vfio_group_get_iommu_group(vfio_group);
+ list_for_each_entry(kvg, &kv->group_list, node) {
+ struct iommu_group *grp;
+
+ if (kvg->file != f.file)
+ continue;
+
+ grp = kvm_vfio_file_iommu_group(kvg->file);
if (WARN_ON_ONCE(!grp)) {
- kvm_vfio_group_put_external_user(vfio_group);
- return -EIO;
+ ret = -EIO;
+ goto err_fdput;
}
- ret = -ENOENT;
-
- mutex_lock(&kv->lock);
+ ret = kvm_spapr_tce_attach_iommu_group(dev->kvm, param.tablefd,
+ grp);
+ break;
+ }
- list_for_each_entry(kvg, &kv->group_list, node) {
- if (kvg->vfio_group != vfio_group)
- continue;
+err_fdput:
+ mutex_unlock(&kv->lock);
+ fdput(f);
+ return ret;
+}
+#endif
- ret = kvm_spapr_tce_attach_iommu_group(dev->kvm,
- param.tablefd, grp);
- break;
- }
+static int kvm_vfio_set_group(struct kvm_device *dev, long attr,
+ void __user *arg)
+{
+ int32_t __user *argp = arg;
+ int32_t fd;
- mutex_unlock(&kv->lock);
+ switch (attr) {
+ case KVM_DEV_VFIO_GROUP_ADD:
+ if (get_user(fd, argp))
+ return -EFAULT;
+ return kvm_vfio_group_add(dev, fd);
- iommu_group_put(grp);
- kvm_vfio_group_put_external_user(vfio_group);
+ case KVM_DEV_VFIO_GROUP_DEL:
+ if (get_user(fd, argp))
+ return -EFAULT;
+ return kvm_vfio_group_del(dev, fd);
- return ret;
- }
-#endif /* CONFIG_SPAPR_TCE_IOMMU */
+#ifdef CONFIG_SPAPR_TCE_IOMMU
+ case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE:
+ return kvm_vfio_group_set_spapr_tce(dev, arg);
+#endif
}
return -ENXIO;
@@ -334,7 +290,8 @@ static int kvm_vfio_set_attr(struct kvm_device *dev,
{
switch (attr->group) {
case KVM_DEV_VFIO_GROUP:
- return kvm_vfio_set_group(dev, attr->attr, attr->addr);
+ return kvm_vfio_set_group(dev, attr->attr,
+ u64_to_user_ptr(attr->addr));
}
return -ENXIO;
@@ -367,10 +324,10 @@ static void kvm_vfio_destroy(struct kvm_device *dev)
list_for_each_entry_safe(kvg, tmp, &kv->group_list, node) {
#ifdef CONFIG_SPAPR_TCE_IOMMU
- kvm_spapr_tce_release_vfio_group(dev->kvm, kvg->vfio_group);
+ kvm_spapr_tce_release_vfio_group(dev->kvm, kvg);
#endif
- kvm_vfio_group_set_kvm(kvg->vfio_group, NULL);
- kvm_vfio_group_put_external_user(kvg->vfio_group);
+ kvm_vfio_file_set_kvm(kvg->file, NULL);
+ fput(kvg->file);
list_del(&kvg->node);
kfree(kvg);
kvm_arch_end_assignment(dev->kvm);