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From 01ad4c3dbed4a506e4c7988026336181aa5fd991 Mon Sep 17 00:00:00 2001
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From: Pankaj Gupta <pagupta@redhat.com>
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Date: Fri, 13 Jul 2018 12:52:28 +0200
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Subject: [PATCH 42/89] virtio-rng: process pending requests on DRIVER_OK
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RH-Author: Pankaj Gupta <pagupta@redhat.com>
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Message-id: <20180713125228.14458-1-pagupta@redhat.com>
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Patchwork-id: 81347
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O-Subject: [RHEL7.6 qemu-kvm-rhev PATCH] virtio-rng: process pending requests on DRIVER_OK
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Bugzilla: 1576743
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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virtio-rng device causes old guest kernels(2.6.32) to hang on latest qemu.
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The driver attempts to read from the virtio-rng device too early in it's
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initialization. Qemu detects guest is not ready and returns, resulting in
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hang.
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To fix handle pending requests when guest is running and driver status is
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set to 'VIRTIO_CONFIG_S_DRIVER_OK'.
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CC: qemu-stable@nongnu.org
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Reported-by: Sergio lopez <slopezpa@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit 5d9c9ea22ab4f3b3ee497523e34b6f4d3281f62d)
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Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/virtio/virtio-rng.c | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
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index 289bbca..855f1b4 100644
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--- a/hw/virtio/virtio-rng.c
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+++ b/hw/virtio/virtio-rng.c
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@@ -156,6 +156,19 @@ static void check_rate_limit(void *opaque)
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vrng->activate_timer = true;
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}
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+static void virtio_rng_set_status(VirtIODevice *vdev, uint8_t status)
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+{
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+ VirtIORNG *vrng = VIRTIO_RNG(vdev);
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+
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+ if (!vdev->vm_running) {
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+ return;
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+ }
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+ vdev->status = status;
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+
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+ /* Something changed, try to process buffers */
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+ virtio_rng_process(vrng);
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+}
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+
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static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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@@ -261,6 +274,7 @@ static void virtio_rng_class_init(ObjectClass *klass, void *data)
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vdc->realize = virtio_rng_device_realize;
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vdc->unrealize = virtio_rng_device_unrealize;
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vdc->get_features = get_features;
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+ vdc->set_status = virtio_rng_set_status;
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}
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static const TypeInfo virtio_rng_info = {
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--
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1.8.3.1
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