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Re: [Qemu-devel] [PATCH v3] vfio : add aer process


From: Zhou Jie
Subject: Re: [Qemu-devel] [PATCH v3] vfio : add aer process
Date: Mon, 15 Aug 2016 10:53:44 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

ping

On 2016/8/2 11:57, Zhou Jie wrote:
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 <address@hidden>
---
v2-v3:
   1. Call init_completion() in vfio_pci_probe.
   2. Call reinit_completion() in vfio_pci_aer_err_detected.
   3. Remove unnecessary brackets.

v1-v2:
   1. Add aer process to vfio driver.

 drivers/vfio/pci/vfio_pci.c         | 48 +++++++++++++++++++++++++++++++++++++
 drivers/vfio/pci/vfio_pci_private.h |  2 ++
 include/uapi/linux/vfio.h           |  2 ++
 3 files changed, 52 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index d624a52..4c246a1 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -648,6 +648,15 @@ 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;

@@ -664,6 +673,10 @@ 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;

@@ -1070,6 +1083,13 @@ 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:
@@ -1228,6 +1248,7 @@ static int vfio_pci_probe(struct pci_dev *pdev, const 
struct pci_device_id *id)
        vdev->irq_type = VFIO_PCI_NUM_IRQS;
        mutex_init(&vdev->igate);
        spin_lock_init(&vdev->irqlock);
+       init_completion(&vdev->aer_error_completion);

        ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
        if (ret) {
@@ -1300,6 +1321,11 @@ static pci_ers_result_t vfio_pci_aer_err_detected(struct 
pci_dev *pdev,

        mutex_lock(&vdev->igate);

+       vdev->aer_error_in_progress = true;
+       reinit_completion(&vdev->aer_error_completion);
+       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);

@@ -1310,8 +1336,30 @@ static pci_ers_result_t vfio_pci_aer_err_detected(struct 
pci_dev *pdev,
        return PCI_ERS_RESULT_CAN_RECOVER;
 }

+static void vfio_pci_aer_resume(struct pci_dev *pdev)
+{
+       struct vfio_pci_device *vdev;
+       struct vfio_device *device;
+
+       device = vfio_device_get_from_dev(&pdev->dev);
+       if (device == NULL)
+               return;
+
+       vdev = vfio_device_data(device);
+       if (vdev == NULL) {
+               vfio_device_put(device);
+               return;
+       }
+
+       vdev->aer_error_in_progress = false;
+       complete_all(&vdev->aer_error_completion);
+
+       vfio_device_put(device);
+}
+
 static const struct pci_error_handlers vfio_err_handlers = {
        .error_detected = vfio_pci_aer_err_detected,
+       .resume         = vfio_pci_aer_resume,
 };

 static struct pci_driver vfio_pci_driver = {
diff --git a/drivers/vfio/pci/vfio_pci_private.h 
b/drivers/vfio/pci/vfio_pci_private.h
index 2128de8..7430d92 100644
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -91,6 +91,8 @@ 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 255a211..59b9cf6 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 */
 };


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Dept 1
No. 6 Wenzhu Road,
Nanjing, 210012, China
TEL:+86+25-86630566-8557
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