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[Qemu-devel] [RFC v8 12/13] vfio-pci: pass the aer error to guest
From: |
Chen Fan |
Subject: |
[Qemu-devel] [RFC v8 12/13] vfio-pci: pass the aer error to guest |
Date: |
Mon, 25 May 2015 18:06:12 +0800 |
when the vfio device encounters an uncorrectable error in host,
the vfio_pci driver will signal the eventfd registered by this
vfio device, the results in the qemu eventfd handler getting
invoked.
this patch is to pass the error to guest and have the guest driver
recover from the error.
Signed-off-by: Chen Fan <address@hidden>
---
hw/vfio/pci.c | 42 ++++++++++++++++++++++++++++++++++++------
1 file changed, 36 insertions(+), 6 deletions(-)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 29a2b12..b297d7c 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3348,18 +3348,48 @@ static void vfio_put_device(VFIOPCIDevice *vdev)
static void vfio_err_notifier_handler(void *opaque)
{
VFIOPCIDevice *vdev = opaque;
+ PCIDevice *dev = &vdev->pdev;
+ PCIEAERMsg msg = {
+ .severity = 0,
+ .source_id = (pci_bus_num(dev->bus) << 8) | dev->devfn,
+ };
if (!event_notifier_test_and_clear(&vdev->err_notifier)) {
return;
}
/*
- * TBD. Retrieve the error details and decide what action
- * needs to be taken. One of the actions could be to pass
- * the error to the guest and have the guest driver recover
- * from the error. This requires that PCIe capabilities be
- * exposed to the guest. For now, we just terminate the
- * guest to contain the error.
+ * in case the real hardware configration has been changed,
+ * here we should recheck the bus reset capability.
+ */
+ vfio_check_host_bus_reset(vdev);
+
+ /*
+ * we should read the error details from the real hardware
+ * configuration spaces, here we only need to do is signaling
+ * to guest an uncorrectable error has occurred.
+ */
+ if (dev->exp.aer_cap &&
+ vdev->has_bus_reset) {
+ uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
+ uint32_t uncor_status;
+ bool isfatal;
+
+ uncor_status = vfio_pci_read_config(dev,
+ dev->exp.aer_cap + PCI_ERR_UNCOR_STATUS, 4);
+
+ isfatal = uncor_status & pci_get_long(aer_cap + PCI_ERR_UNCOR_SEVER);
+
+ msg.severity = isfatal ? PCI_ERR_ROOT_CMD_FATAL_EN :
+ PCI_ERR_ROOT_CMD_NONFATAL_EN;
+
+ pcie_aer_msg(dev, &msg);
+ return;
+ }
+
+ /*
+ * If the aer capability is not exposed to the guest. we just
+ * terminate the guest to contain the error.
*/
error_report("%s(%04x:%02x:%02x.%x) Unrecoverable error detected. "
--
1.9.3
- [Qemu-devel] [RFC v8 01/13] vfio: extract vfio_get_hot_reset_info as a single function, (continued)
- [Qemu-devel] [RFC v8 01/13] vfio: extract vfio_get_hot_reset_info as a single function, Chen Fan, 2015/05/25
- [Qemu-devel] [RFC v8 03/13] vfio: add pcie extanded capability support, Chen Fan, 2015/05/25
- [Qemu-devel] [RFC v8 04/13] aer: impove pcie_aer_init to support vfio device, Chen Fan, 2015/05/25
- [Qemu-devel] [RFC v8 05/13] vfio: add aer support for vfio device, Chen Fan, 2015/05/25
- [Qemu-devel] [RFC v8 06/13] vfio: add check host bus reset is support or not, Chen Fan, 2015/05/25
- [Qemu-devel] [RFC v8 07/13] vfio: add check for vfio devices which enable aer should support bus reset, Chen Fan, 2015/05/25
- [Qemu-devel] [RFC v8 08/13] pci: add bus reset_notifiers callbacks for host bus reset, Chen Fan, 2015/05/25
- [Qemu-devel] [RFC v8 10/13] vfio: do hot bus reset when do virtual secondary bus reset, Chen Fan, 2015/05/25
- [Qemu-devel] [RFC v8 09/13] vfio: add sec_bus_reset notifier to notify physical bus reset is needed, Chen Fan, 2015/05/25
- [Qemu-devel] [RFC v8 11/13] pcie_aer: expose pcie_aer_msg() interface, Chen Fan, 2015/05/25
- [Qemu-devel] [RFC v8 12/13] vfio-pci: pass the aer error to guest,
Chen Fan <=
- [Qemu-devel] [RFC v8 13/13] vfio: add 'aer' property to expose aercap, Chen Fan, 2015/05/25
- Re: [Qemu-devel] [RFC v8 00/13] vfio-pci: pass the aer error to guest, Chen Fan, 2015/05/26