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Re: [Qemu-devel] [RFC v8.1 12/13] vfio-pci: pass the aer error to guest
From: |
Alex Williamson |
Subject: |
Re: [Qemu-devel] [RFC v8.1 12/13] vfio-pci: pass the aer error to guest |
Date: |
Wed, 27 May 2015 15:33:18 -0600 |
On Wed, 2015-05-27 at 10:46 +0800, Chen Fan wrote:
> 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 b05ccdf..855a0a6 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);
Why would we run this on devices without the AER feature? I agree that
we do need to revalidate for devices that are exposing AER forwarding.
> +
> + /*
> + * 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. "
- Re: [Qemu-devel] [RFC v8.1 06/13] vfio: add check host bus reset is support or not, (continued)
- [Qemu-devel] [RFC v8.1 07/13] vfio: add check for vfio devices which enable aer should support bus reset, Chen Fan, 2015/05/26
- [Qemu-devel] [RFC v8.1 08/13] pci: add bus reset_notifiers callbacks for host bus reset, Chen Fan, 2015/05/26
- [Qemu-devel] [RFC v8.1 09/13] vfio: add sec_bus_reset notifier to notify physical bus reset is needed, Chen Fan, 2015/05/26
- [Qemu-devel] [RFC v8.1 10/13] vfio: do hot bus reset when do virtual secondary bus reset, Chen Fan, 2015/05/26
- [Qemu-devel] [RFC v8.1 11/13] pcie_aer: expose pcie_aer_msg() interface, Chen Fan, 2015/05/26
- [Qemu-devel] [RFC v8.1 12/13] vfio-pci: pass the aer error to guest, Chen Fan, 2015/05/26
- Re: [Qemu-devel] [RFC v8.1 12/13] vfio-pci: pass the aer error to guest,
Alex Williamson <=
- [Qemu-devel] [RFC v8.1 13/13] vfio: add 'aer' property to expose aercap, Chen Fan, 2015/05/26