From: Chen Fan <chen.fan.f...@cn.fujitsu.com>
During aer err occurs and resume do following to
protect device from being accessed.
1. Make config space read only.
2. Disable INTx/MSI Interrupt.
3. Do nothing for bar regions.
Signed-off-by: Zhou Jie <zhoujie2...@cn.fujitsu.com>
---
drivers/vfio/pci/vfio_pci.c | 30 ++++++++++++++++++++++++++++++
drivers/vfio/pci/vfio_pci_private.h | 2 ++
include/uapi/linux/vfio.h | 2 ++
3 files changed, 34 insertions(+)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 2d12b03..dd96b60 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -318,6 +318,7 @@ static int vfio_pci_open(void *device_data)
return -ENODEV;
mutex_lock(&driver_lock);
+ init_completion(&vdev->aer_error_completion);
if (!vdev->refcnt) {
ret = vfio_pci_enable(vdev);
@@ -571,6 +572,16 @@ static long vfio_pci_ioctl(void *device_data,
struct vfio_pci_device *vdev = device_data;
unsigned long minsz;
+ if (vdev->aer_error_in_progress && (cmd == VFIO_DEVICE_SET_IRQS ||
+ cmd == VFIO_DEVICE_RESET || cmd == VFIO_DEVICE_PCI_HOT_RESET)) {
+ int ret;
+ ret = wait_for_completion_interruptible(
+ &vdev->aer_error_completion);
+ if (ret) {
+ return ret;
+ }
+ }
+
if (cmd == VFIO_DEVICE_GET_INFO) {
struct vfio_device_info info;
@@ -587,6 +598,10 @@ static long vfio_pci_ioctl(void *device_data,
if (vdev->reset_works)
info.flags |= VFIO_DEVICE_FLAGS_RESET;
+ info.flags |= VFIO_DEVICE_FLAGS_AERPROCESS;
+ if (vdev->aer_error_in_progress)
+ info.flags |= VFIO_DEVICE_FLAGS_INAERPROCESS;
+
info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions;
info.num_irqs = VFIO_PCI_NUM_IRQS;
@@ -996,6 +1011,14 @@ static ssize_t vfio_pci_rw(void *device_data, char __user
*buf,
switch (index) {
case VFIO_PCI_CONFIG_REGION_INDEX:
+ if (vdev->aer_error_in_progress && iswrite) {
+ int ret;
+ ret = wait_for_completion_interruptible(
+ &vdev->aer_error_completion);
+ if (ret) {
+ return ret;
+ }
+ }
return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
case VFIO_PCI_ROM_REGION_INDEX:
@@ -1226,6 +1249,10 @@ static pci_ers_result_t vfio_pci_aer_err_detected(struct
pci_dev *pdev,
mutex_lock(&vdev->igate);
+ vdev->aer_error_in_progress = true;
+ vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
+ VFIO_IRQ_SET_ACTION_TRIGGER,
+ vdev->irq_type, 0, 0, NULL);
if (vdev->err_trigger)
eventfd_signal(vdev->err_trigger, 1);
@@ -1252,6 +1279,9 @@ static void vfio_pci_aer_resume(struct pci_dev *pdev)
}
mutex_lock(&vdev->igate);
+
+ vdev->aer_error_in_progress = false;
+ complete_all(&vdev->aer_error_completion);
if (vdev->resume_trigger)
eventfd_signal(vdev->resume_trigger, 1);
diff --git a/drivers/vfio/pci/vfio_pci_private.h
b/drivers/vfio/pci/vfio_pci_private.h
index 80d4ddd..2f151f5 100644
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -84,6 +84,8 @@ struct vfio_pci_device {
bool has_vga;
bool needs_reset;
bool nointx;
+ bool aer_error_in_progress;
+ struct completion aer_error_completion;
struct pci_saved_state *pci_saved_state;
int refcnt;
struct eventfd_ctx *err_trigger;
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 34ab138..276ce50 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -198,6 +198,8 @@ struct vfio_device_info {
#define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */
#define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2) /* vfio-platform device */
#define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */
+#define VFIO_DEVICE_FLAGS_AERPROCESS (1 << 4) /* support aer error progress */
+#define VFIO_DEVICE_FLAGS_INAERPROCESS (1 << 5)/* status in aer error
progress */
__u32 num_regions; /* Max region index + 1 */
__u32 num_irqs; /* Max IRQ index + 1 */
};
--
1.8.3.1
