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[Qemu-devel] [PATCH 95/99] virtio-rng: process pending requests on DRIVE
From: |
Michael Roth |
Subject: |
[Qemu-devel] [PATCH 95/99] virtio-rng: process pending requests on DRIVER_OK |
Date: |
Mon, 23 Jul 2018 15:17:44 -0500 |
From: Pankaj Gupta <address@hidden>
virtio-rng device causes old guest kernels(2.6.32) to hang on latest qemu.
The driver attempts to read from the virtio-rng device too early in it's
initialization. Qemu detects guest is not ready and returns, resulting in
hang.
To fix handle pending requests when guest is running and driver status is
set to 'VIRTIO_CONFIG_S_DRIVER_OK'.
CC: address@hidden
Reported-by: Sergio lopez <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
Signed-off-by: Pankaj Gupta <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
(cherry picked from commit 5d9c9ea22ab4f3b3ee497523e34b6f4d3281f62d)
Signed-off-by: Michael Roth <address@hidden>
---
hw/virtio/virtio-rng.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index 289bbcac03..855f1b41d1 100644
--- a/hw/virtio/virtio-rng.c
+++ b/hw/virtio/virtio-rng.c
@@ -156,6 +156,19 @@ static void check_rate_limit(void *opaque)
vrng->activate_timer = true;
}
+static void virtio_rng_set_status(VirtIODevice *vdev, uint8_t status)
+{
+ VirtIORNG *vrng = VIRTIO_RNG(vdev);
+
+ if (!vdev->vm_running) {
+ return;
+ }
+ vdev->status = status;
+
+ /* Something changed, try to process buffers */
+ virtio_rng_process(vrng);
+}
+
static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
@@ -261,6 +274,7 @@ static void virtio_rng_class_init(ObjectClass *klass, void
*data)
vdc->realize = virtio_rng_device_realize;
vdc->unrealize = virtio_rng_device_unrealize;
vdc->get_features = get_features;
+ vdc->set_status = virtio_rng_set_status;
}
static const TypeInfo virtio_rng_info = {
--
2.17.1
- [Qemu-devel] [PATCH 86/99] hw/isa/superio: Fix inconsistent use of Chardev->be, (continued)
- [Qemu-devel] [PATCH 86/99] hw/isa/superio: Fix inconsistent use of Chardev->be, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 87/99] mux: fix ctrl-a b again, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 88/99] nfs: Remove processed options from QDict, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 89/99] replace functions which are only available in glib-2.24, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 90/99] vfio/pci: Default display option to "off", Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 91/99] migration/block-dirty-bitmap: fix dirty_bitmap_load, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 08/99] target/ppc: always set PPC_MEM_TLBIE in pre 2.8 migration hack, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 92/99] tcg: Reduce max TB opcode count, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 94/99] iscsi: Avoid potential for get_status overflow, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 93/99] nbd/server: Reject 0-length block status request, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 95/99] virtio-rng: process pending requests on DRIVER_OK,
Michael Roth <=
- [Qemu-devel] [PATCH 96/99] target/ppc: set is_jmp on ppc_tr_breakpoint_check, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 97/99] tap: fix memory leak on success to create a tap device, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 98/99] qemu-img: avoid overflow of min_sparse parameter, Michael Roth, 2018/07/23