Allow loading of larger images than 512 MB by dropping the arbitrary
hard-coded value that we have today and move to use the max device
loading value which is for now 4GB.
As part of that we move to use the GFP_KERNEL_ACCOUNT option upon
allocating the persistent data of mlx5 and rely on the cgroup to provide
the memory limit for the given user.
The GFP_KERNEL_ACCOUNT option lets the memory allocator know that this
is untrusted allocation triggered from userspace and should be a subject
of kmem accountingis, and as such it is controlled by the cgroup
mechanism.
Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxx>
---
drivers/vfio/pci/mlx5/cmd.c | 11 ++++++-----
drivers/vfio/pci/mlx5/main.c | 19 ++++++++++---------
2 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/drivers/vfio/pci/mlx5/cmd.c b/drivers/vfio/pci/mlx5/cmd.c
index c5dcddbc4126..0586f09c69af 100644
--- a/drivers/vfio/pci/mlx5/cmd.c
+++ b/drivers/vfio/pci/mlx5/cmd.c
@@ -373,7 +373,7 @@ mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf,
struct mlx5_vhca_data_buffer *buf;
int ret;
- buf = kzalloc(sizeof(*buf), GFP_KERNEL);
+ buf = kzalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT);
if (!buf)
return ERR_PTR(-ENOMEM);
@@ -1032,7 +1032,7 @@ mlx5vf_create_rc_qp(struct mlx5_core_dev *mdev,
void *in;
int err;
- qp = kzalloc(sizeof(*qp), GFP_KERNEL);
+ qp = kzalloc(sizeof(*qp), GFP_KERNEL_ACCOUNT);
if (!qp)
return ERR_PTR(-ENOMEM);
@@ -1213,12 +1213,13 @@ static int alloc_recv_pages(struct mlx5_vhca_recv_buf *recv_buf,
int i;
recv_buf->page_list = kvcalloc(npages, sizeof(*recv_buf->page_list),
- GFP_KERNEL);
+ GFP_KERNEL_ACCOUNT);
if (!recv_buf->page_list)
return -ENOMEM;
for (;;) {
- filled = alloc_pages_bulk_array(GFP_KERNEL, npages - done,
+ filled = alloc_pages_bulk_array(GFP_KERNEL_ACCOUNT,
+ npages - done,
recv_buf->page_list + done);
if (!filled)
goto err;
@@ -1248,7 +1249,7 @@ static int register_dma_recv_pages(struct mlx5_core_dev *mdev,
recv_buf->dma_addrs = kvcalloc(recv_buf->npages,
sizeof(*recv_buf->dma_addrs),
- GFP_KERNEL);
+ GFP_KERNEL_ACCOUNT);
if (!recv_buf->dma_addrs)
return -ENOMEM;
diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c
index 9feb89c6d939..7ba127d8889a 100644
--- a/drivers/vfio/pci/mlx5/main.c
+++ b/drivers/vfio/pci/mlx5/main.c
@@ -21,8 +21,8 @@
#include "cmd.h"
-/* Arbitrary to prevent userspace from consuming endless memory */
-#define MAX_MIGRATION_SIZE (512*1024*1024)
+/* Device specification max LOAD size */
+#define MAX_LOAD_SIZE (BIT_ULL(__mlx5_bit_sz(load_vhca_state_in, size)) - 1)
static struct mlx5vf_pci_core_device *mlx5vf_drvdata(struct pci_dev *pdev)
{
@@ -73,12 +73,13 @@ int mlx5vf_add_migration_pages(struct mlx5_vhca_data_buffer *buf,
int ret;
to_fill = min_t(unsigned int, npages, PAGE_SIZE / sizeof(*page_list));
- page_list = kvzalloc(to_fill * sizeof(*page_list), GFP_KERNEL);
+ page_list = kvzalloc(to_fill * sizeof(*page_list), GFP_KERNEL_ACCOUNT);
if (!page_list)
return -ENOMEM;
do {
- filled = alloc_pages_bulk_array(GFP_KERNEL, to_fill, page_list);
+ filled = alloc_pages_bulk_array(GFP_KERNEL_ACCOUNT, to_fill,
+ page_list);
if (!filled) {
ret = -ENOMEM;
goto err;
@@ -87,7 +88,7 @@ int mlx5vf_add_migration_pages(struct mlx5_vhca_data_buffer *buf,
ret = sg_alloc_append_table_from_pages(
&buf->table, page_list, filled, 0,
filled << PAGE_SHIFT, UINT_MAX, SG_MAX_SINGLE_ALLOC,
- GFP_KERNEL);
+ GFP_KERNEL_ACCOUNT);
if (ret)
goto err;
@@ -467,7 +468,7 @@ mlx5vf_pci_save_device_data(struct mlx5vf_pci_core_device *mvdev, bool track)
size_t length;
int ret;
- migf = kzalloc(sizeof(*migf), GFP_KERNEL);
+ migf = kzalloc(sizeof(*migf), GFP_KERNEL_ACCOUNT);
if (!migf)
return ERR_PTR(-ENOMEM);
@@ -564,7 +565,7 @@ mlx5vf_resume_read_image_no_header(struct mlx5_vhca_data_buffer *vhca_buf,
{
int ret;
- if (requested_length > MAX_MIGRATION_SIZE)
+ if (requested_length > MAX_LOAD_SIZE)
return -ENOMEM;
if (vhca_buf->allocated_length < requested_length) {
@@ -648,7 +649,7 @@ mlx5vf_resume_read_header(struct mlx5_vf_migration_file *migf,
u64 flags;
vhca_buf->header_image_size = le64_to_cpup((__le64 *)to_buff);
- if (vhca_buf->header_image_size > MAX_MIGRATION_SIZE) {
+ if (vhca_buf->header_image_size > MAX_LOAD_SIZE) {
ret = -ENOMEM;
goto end;
}
@@ -781,7 +782,7 @@ mlx5vf_pci_resume_device_data(struct mlx5vf_pci_core_device *mvdev)
struct mlx5_vhca_data_buffer *buf;
int ret;
- migf = kzalloc(sizeof(*migf), GFP_KERNEL);
+ migf = kzalloc(sizeof(*migf), GFP_KERNEL_ACCOUNT);
if (!migf)
return ERR_PTR(-ENOMEM);
--
2.18.1
