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[Qemu-devel] [RFC v2 4/8] vfio-pci: pass the aer error to guest
From: |
Chen Fan |
Subject: |
[Qemu-devel] [RFC v2 4/8] vfio-pci: pass the aer error to guest |
Date: |
Wed, 28 Jan 2015 16:37:24 +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 | 34 ++++++++++++++++++++++++++++------
1 file changed, 28 insertions(+), 6 deletions(-)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 2072261..8c81bb3 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3141,18 +3141,40 @@ 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;
}
+ /* 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) {
+ 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;
+ }
+
/*
- * 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.
+ * 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 v2 0/8] pass aer error to guest for vfio device, Chen Fan, 2015/01/28
- [Qemu-devel] [RFC v2 3/8] pcie_aer: expose pcie_aer_msg() interface, Chen Fan, 2015/01/28
- [Qemu-devel] [RFC v2 2/8] vfio-pci: add aer capability support, Chen Fan, 2015/01/28
- [Qemu-devel] [RFC v2 4/8] vfio-pci: pass the aer error to guest,
Chen Fan <=
- [Qemu-devel] [RFC v2 6/8] vfio_pci: fix a wrong check in vfio_pci_reset, Chen Fan, 2015/01/28
- [Qemu-devel] [RFC v2 1/8] pcie_aer: fix typos in pcie_aer_inject_error comment, Chen Fan, 2015/01/28
- [Qemu-devel] [RFC v2 5/8] pcie_aer: fix a trivial typo in PCIEAERMsg comments, Chen Fan, 2015/01/28
- [Qemu-devel] [RFC v2 7/8] vfio_pci: change vfio device features bit macro to enum definition, Chen Fan, 2015/01/28
- [Qemu-devel] [RFC v2 8/8] vfio-pci: add VFIO_FEATURE_ENABLE_AER_CAP feature, Chen Fan, 2015/01/28