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[Qemu-devel] [PATCH for virtio-1.0] virtio-pci: correctly set host notif
From: |
Jason Wang |
Subject: |
[Qemu-devel] [PATCH for virtio-1.0] virtio-pci: correctly set host notifiers for modern bar |
Date: |
Fri, 10 Apr 2015 18:00:14 +0800 |
Currently, during host notifier set. We only add eventfd for legacy
bar, this is not correct since:
- Non-transitional device does not have legacy bar, so qemu will crash
since proxy->bar was not initialized.
- Modern device uses modern bar and notify cap to notify the device,
we should add eventfd for proxy->notify.
So this patch fixes the above two issues by adding eventfd based on
whether legacy or modern device were supported.
Signed-off-by: Jason Wang <address@hidden>
---
hw/virtio/virtio-pci.c | 31 +++++++++++++++++++++++++------
1 file changed, 25 insertions(+), 6 deletions(-)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index e6b0df4..89ef5ed 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -180,12 +180,21 @@ static int virtio_pci_load_queue(DeviceState *d, int n,
QEMUFile *f)
return 0;
}
+#define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000
+
static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy,
int n, bool assign, bool
set_handler)
{
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
VirtQueue *vq = virtio_get_queue(vdev, n);
EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
+ bool legacy = !(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_LEGACY);
+ bool modern = !(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_MODERN);
+ MemoryRegion *modern_mr = &proxy->notify;
+ MemoryRegion *legacy_mr = &proxy->bar;
+ hwaddr modern_addr = QEMU_VIRTIO_PCI_QUEUE_MEM_MULT *
+ virtio_get_queue_index(vq);
+ hwaddr legacy_addr = VIRTIO_PCI_QUEUE_NOTIFY;
int r = 0;
if (assign) {
@@ -196,11 +205,23 @@ static int
virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy,
return r;
}
virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
- memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
- true, n, notifier);
+ if (modern) {
+ memory_region_add_eventfd(modern_mr, modern_addr, 2,
+ true, n, notifier);
+ }
+ if (legacy) {
+ memory_region_add_eventfd(legacy_mr, legacy_addr, 2,
+ true, n, notifier);
+ }
} else {
- memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
- true, n, notifier);
+ if (modern) {
+ memory_region_del_eventfd(modern_mr, modern_addr, 2,
+ true, n, notifier);
+ }
+ if (legacy) {
+ memory_region_del_eventfd(legacy_mr, legacy_addr, 2,
+ true, n, notifier);
+ }
virtio_queue_set_host_notifier_fd_handler(vq, false, false);
event_notifier_cleanup(notifier);
}
@@ -973,8 +994,6 @@ static void virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy,
cap->cap_len - PCI_CAP_FLAGS);
}
-#define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000
-
static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr,
unsigned size)
{
--
2.1.0
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