[Qemu-devel] [patch v5 11/12] vfio: device may stuck in D3 when doing aer recovery

From: Cao jin <caoj.fnst@cn.fujitsu.com>
To: qemu-devel@nongnu.org
Cc: chen.fan.fnst@cn.fujitsu.com, izumi.taku@jp.fujitsu.com,
	alex.williamson@redhat.com, mst@redhat.com
Subject: [Qemu-devel] [patch v5 11/12] vfio: device may stuck in D3 when doing aer recovery
Date: Wed, 23 Mar 2016 18:12:06 +0800	[thread overview]
Message-ID: <1458727927-15082-12-git-send-email-caoj.fnst@cn.fujitsu.com> (raw)
In-Reply-To: <1458727927-15082-1-git-send-email-caoj.fnst@cn.fujitsu.com>

From: Chen Fan <chen.fan.fnst@cn.fujitsu.com>

when a physical device aer occurred, the device state probably
is not in D0 in a short time, if we recover the device quickly.
we may stuck in D3 state when force to change device state to D0.
we may need to wait for a short time to inject the error to guest.

Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
---
 hw/vfio/pci.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 25fc095..5216e7f 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2658,6 +2658,9 @@ static void vfio_err_notifier_handler(void *opaque)
         msg.severity = isfatal ? PCI_ERR_ROOT_CMD_FATAL_EN :
                                  PCI_ERR_ROOT_CMD_NONFATAL_EN;
 
+        /* wait a bit to ensure aer device is ready */
+        usleep(2 * 1000);
+
         pcie_aer_msg(dev, &msg);
         return;
     }
-- 
1.9.3
