7d37d351df
Make use of the new vector notifier to track changes of the MSI-X configuration of virtio PCI devices. On enabling events, we establish the required virtual IRQ to MSI-X message route and link the signaling eventfd file descriptor to this vIRQ line. That way, vhost-generated interrupts can be directly delivered to an in-kernel MSI-X consumer like the x86 APIC. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
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* Virtio PCI Bindings
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*
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* Copyright IBM, Corp. 2007
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* Copyright (c) 2009 CodeSourcery
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Paul Brook <paul@codesourcery.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_VIRTIO_PCI_H
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#define QEMU_VIRTIO_PCI_H
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#include "virtio-net.h"
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#include "virtio-serial.h"
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#include "virtio-scsi.h"
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/* Performance improves when virtqueue kick processing is decoupled from the
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* vcpu thread using ioeventfd for some devices. */
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#define VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT 1
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#define VIRTIO_PCI_FLAG_USE_IOEVENTFD (1 << VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT)
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typedef struct {
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int virq;
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unsigned int users;
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} VirtIOIRQFD;
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typedef struct {
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PCIDevice pci_dev;
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VirtIODevice *vdev;
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MemoryRegion bar;
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MemoryRegion msix_bar;
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uint32_t flags;
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uint32_t class_code;
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uint32_t nvectors;
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BlockConf block;
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char *block_serial;
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NICConf nic;
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uint32_t host_features;
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#ifdef CONFIG_LINUX
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V9fsConf fsconf;
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#endif
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virtio_serial_conf serial;
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virtio_net_conf net;
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VirtIOSCSIConf scsi;
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bool ioeventfd_disabled;
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bool ioeventfd_started;
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VirtIOIRQFD *vector_irqfd;
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} VirtIOPCIProxy;
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void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev);
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void virtio_pci_reset(DeviceState *d);
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/* Virtio ABI version, if we increment this, we break the guest driver. */
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#define VIRTIO_PCI_ABI_VERSION 0
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#endif
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