[PATCH v13 04/22] kvm/vfio: Prepare for accepting vfio device fd

Yi Liu
2023-06-16T09:40:39Z

This renames kvm_vfio_group related helpers to prepare for accepting
vfio device fd. No functional change is intended.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Terrence Xu <terrence.xu@intel.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Yanting Jiang <yanting.jiang@intel.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
virt/kvm/vfio.c | 115 ++++++++++++++++++++++++------------------------
1 file changed, 58 insertions(+), 57 deletions(-)

diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index b33c7b8488b3..8f7fa07e8170 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -21,7 +21,7 @@
#include <asm/kvm_ppc.h>
#endif

-struct kvm_vfio_group {
+struct kvm_vfio_file {
struct list_head node;
struct file *file;
#ifdef CONFIG_SPAPR_TCE_IOMMU
@@ -30,7 +30,7 @@ struct kvm_vfio_group {
};

struct kvm_vfio {
- struct list_head group_list;
+ struct list_head file_list;
struct mutex lock;
bool noncoherent;
};
@@ -98,34 +98,35 @@ static struct iommu_group *kvm_vfio_file_iommu_group(struct file *file)
}

static void kvm_spapr_tce_release_vfio_group(struct kvm *kvm,
- struct kvm_vfio_group *kvg)
+ struct kvm_vfio_file *kvf)
{
- if (WARN_ON_ONCE(!kvg->iommu_group))
+ if (WARN_ON_ONCE(!kvf->iommu_group))
return;

- kvm_spapr_tce_release_iommu_group(kvm, kvg->iommu_group);
- iommu_group_put(kvg->iommu_group);
- kvg->iommu_group = NULL;
+ kvm_spapr_tce_release_iommu_group(kvm, kvf->iommu_group);
+ iommu_group_put(kvf->iommu_group);
+ kvf->iommu_group = NULL;
}
#endif

/*
- * Groups can use the same or different IOMMU domains. If the same then
- * adding a new group may change the coherency of groups we've previously
- * been told about. We don't want to care about any of that so we retest
- * each group and bail as soon as we find one that's noncoherent. This
- * means we only ever [un]register_noncoherent_dma once for the whole device.
+ * Groups/devices can use the same or different IOMMU domains. If the same
+ * then adding a new group/device may change the coherency of groups/devices
+ * we've previously been told about. We don't want to care about any of
+ * that so we retest each group/device and bail as soon as we find one that's
+ * noncoherent. This means we only ever [un]register_noncoherent_dma once
+ * for the whole device.
*/
static void kvm_vfio_update_coherency(struct kvm_device *dev)
{
struct kvm_vfio *kv = dev->private;
bool noncoherent = false;
- struct kvm_vfio_group *kvg;
+ struct kvm_vfio_file *kvf;

mutex_lock(&kv->lock);

- list_for_each_entry(kvg, &kv->group_list, node) {
- if (!kvm_vfio_file_enforced_coherent(kvg->file)) {
+ list_for_each_entry(kvf, &kv->file_list, node) {
+ if (!kvm_vfio_file_enforced_coherent(kvf->file)) {
noncoherent = true;
break;
}
@@ -143,10 +144,10 @@ static void kvm_vfio_update_coherency(struct kvm_device *dev)
mutex_unlock(&kv->lock);
}

-static int kvm_vfio_group_add(struct kvm_device *dev, unsigned int fd)
+static int kvm_vfio_file_add(struct kvm_device *dev, unsigned int fd)
{
struct kvm_vfio *kv = dev->private;
- struct kvm_vfio_group *kvg;
+ struct kvm_vfio_file *kvf;
struct file *filp;
int ret;

@@ -162,27 +163,27 @@ static int kvm_vfio_group_add(struct kvm_device *dev, unsigned int fd)

mutex_lock(&kv->lock);

- list_for_each_entry(kvg, &kv->group_list, node) {
- if (kvg->file == filp) {
+ list_for_each_entry(kvf, &kv->file_list, node) {
+ if (kvf->file == filp) {
ret = -EEXIST;
goto err_unlock;
}
}

- kvg = kzalloc(sizeof(*kvg), GFP_KERNEL_ACCOUNT);
- if (!kvg) {
+ kvf = kzalloc(sizeof(*kvf), GFP_KERNEL_ACCOUNT);
+ if (!kvf) {
ret = -ENOMEM;
goto err_unlock;
}

- kvg->file = filp;
- list_add_tail(&kvg->node, &kv->group_list);
+ kvf->file = filp;
+ list_add_tail(&kvf->node, &kv->file_list);

kvm_arch_start_assignment(dev->kvm);

mutex_unlock(&kv->lock);

- kvm_vfio_file_set_kvm(kvg->file, dev->kvm);
+ kvm_vfio_file_set_kvm(kvf->file, dev->kvm);
kvm_vfio_update_coherency(dev);

return 0;
@@ -193,10 +194,10 @@ static int kvm_vfio_group_add(struct kvm_device *dev, unsigned int fd)
return ret;
}

-static int kvm_vfio_group_del(struct kvm_device *dev, unsigned int fd)
+static int kvm_vfio_file_del(struct kvm_device *dev, unsigned int fd)
{
struct kvm_vfio *kv = dev->private;
- struct kvm_vfio_group *kvg;
+ struct kvm_vfio_file *kvf;
struct fd f;
int ret;

@@ -208,18 +209,18 @@ static int kvm_vfio_group_del(struct kvm_device *dev, unsigned int fd)

mutex_lock(&kv->lock);

- list_for_each_entry(kvg, &kv->group_list, node) {
- if (kvg->file != f.file)
+ list_for_each_entry(kvf, &kv->file_list, node) {
+ if (kvf->file != f.file)
continue;

- list_del(&kvg->node);
+ list_del(&kvf->node);
kvm_arch_end_assignment(dev->kvm);
#ifdef CONFIG_SPAPR_TCE_IOMMU
- kvm_spapr_tce_release_vfio_group(dev->kvm, kvg);
+ kvm_spapr_tce_release_vfio_group(dev->kvm, kvf);
#endif
- kvm_vfio_file_set_kvm(kvg->file, NULL);
- fput(kvg->file);
- kfree(kvg);
+ kvm_vfio_file_set_kvm(kvf->file, NULL);
+ fput(kvf->file);
+ kfree(kvf);
ret = 0;
break;
}
@@ -234,12 +235,12 @@ static int kvm_vfio_group_del(struct kvm_device *dev, unsigned int fd)
}

#ifdef CONFIG_SPAPR_TCE_IOMMU
-static int kvm_vfio_group_set_spapr_tce(struct kvm_device *dev,
- void __user *arg)
+static int kvm_vfio_file_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 kvm_vfio_file *kvf;
struct fd f;
int ret;

@@ -254,20 +255,20 @@ static int kvm_vfio_group_set_spapr_tce(struct kvm_device *dev,

mutex_lock(&kv->lock);

- list_for_each_entry(kvg, &kv->group_list, node) {
- if (kvg->file != f.file)
+ list_for_each_entry(kvf, &kv->file_list, node) {
+ if (kvf->file != f.file)
continue;

- if (!kvg->iommu_group) {
- kvg->iommu_group = kvm_vfio_file_iommu_group(kvg->file);
- if (WARN_ON_ONCE(!kvg->iommu_group)) {
+ if (!kvf->iommu_group) {
+ kvf->iommu_group = kvm_vfio_file_iommu_group(kvf->file);
+ if (WARN_ON_ONCE(!kvf->iommu_group)) {
ret = -EIO;
goto err_fdput;
}
}

ret = kvm_spapr_tce_attach_iommu_group(dev->kvm, param.tablefd,
- kvg->iommu_group);
+ kvf->iommu_group);
break;
}

@@ -278,8 +279,8 @@ static int kvm_vfio_group_set_spapr_tce(struct kvm_device *dev,
}
#endif

-static int kvm_vfio_set_group(struct kvm_device *dev, long attr,
- void __user *arg)
+static int kvm_vfio_set_file(struct kvm_device *dev, long attr,
+ void __user *arg)
{
int32_t __user *argp = arg;
int32_t fd;
@@ -288,16 +289,16 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr,
case KVM_DEV_VFIO_GROUP_ADD:
if (get_user(fd, argp))
return -EFAULT;
- return kvm_vfio_group_add(dev, fd);
+ return kvm_vfio_file_add(dev, fd);

case KVM_DEV_VFIO_GROUP_DEL:
if (get_user(fd, argp))
return -EFAULT;
- return kvm_vfio_group_del(dev, fd);
+ return kvm_vfio_file_del(dev, fd);

#ifdef CONFIG_SPAPR_TCE_IOMMU
case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE:
- return kvm_vfio_group_set_spapr_tce(dev, arg);
+ return kvm_vfio_file_set_spapr_tce(dev, arg);
#endif
}

@@ -309,8 +310,8 @@ 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,
- u64_to_user_ptr(attr->addr));
+ return kvm_vfio_set_file(dev, attr->attr,
+ u64_to_user_ptr(attr->addr));
}

return -ENXIO;
@@ -339,16 +340,16 @@ static int kvm_vfio_has_attr(struct kvm_device *dev,
static void kvm_vfio_release(struct kvm_device *dev)
{
struct kvm_vfio *kv = dev->private;
- struct kvm_vfio_group *kvg, *tmp;
+ struct kvm_vfio_file *kvf, *tmp;

- list_for_each_entry_safe(kvg, tmp, &kv->group_list, node) {
+ list_for_each_entry_safe(kvf, tmp, &kv->file_list, node) {
#ifdef CONFIG_SPAPR_TCE_IOMMU
- kvm_spapr_tce_release_vfio_group(dev->kvm, kvg);
+ kvm_spapr_tce_release_vfio_group(dev->kvm, kvf);
#endif
- kvm_vfio_file_set_kvm(kvg->file, NULL);
- fput(kvg->file);
- list_del(&kvg->node);
- kfree(kvg);
+ kvm_vfio_file_set_kvm(kvf->file, NULL);
+ fput(kvf->file);
+ list_del(&kvf->node);
+ kfree(kvf);
kvm_arch_end_assignment(dev->kvm);
}

@@ -382,7 +383,7 @@ static int kvm_vfio_create(struct kvm_device *dev, u32 type)
if (!kv)
return -ENOMEM;

- INIT_LIST_HEAD(&kv->group_list);
+ INIT_LIST_HEAD(&kv->file_list);
mutex_init(&kv->lock);

dev->private = kv;
--
2.34.1