mirror of
https://github.com/clearlinux/kvmtool.git
synced 2026-09-04 04:31:27 +00:00
Andre Przywara
e9922aaf43
In PCI config space there is an interrupt line field (offset 0x3f), which is used to initially communicate the IRQ line number from firmware to the OS. _Hardware_ should never use this information, as the OS is free to write any information in there. But kvmtool uses this number when it triggers IRQs in the guest, which fails starting with Linux 3.19-rc1, where the PCI layer starts writing the virtual IRQ number in there. Fix that by storing the IRQ number in a separate field in struct virtio_pci, which is independent from the PCI config space and cannot be influenced by the guest. This fixes ARM/ARM64 guests using PCI with newer kernels. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
#ifndef KVM__VIRTIO_PCI_H
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#define KVM__VIRTIO_PCI_H
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#include "kvm/devices.h"
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#include "kvm/pci.h"
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#include <linux/types.h>
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#define VIRTIO_PCI_MAX_VQ 32
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#define VIRTIO_PCI_MAX_CONFIG 1
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struct kvm;
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struct virtio_pci_ioevent_param {
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struct virtio_device *vdev;
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u32 vq;
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};
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#define VIRTIO_PCI_F_SIGNAL_MSI (1 << 0)
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struct virtio_pci {
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struct pci_device_header pci_hdr;
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struct device_header dev_hdr;
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void *dev;
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struct kvm *kvm;
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u16 port_addr;
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u32 mmio_addr;
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u8 status;
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u8 isr;
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u32 features;
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/*
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* We cannot rely on the INTERRUPT_LINE byte in the config space once
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* we have run guest code, as the OS is allowed to use that field
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* as a scratch pad to communicate between driver and PCI layer.
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* So store our legacy interrupt line number in here for internal use.
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*/
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u8 legacy_irq_line;
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/* MSI-X */
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u16 config_vector;
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u32 config_gsi;
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u32 vq_vector[VIRTIO_PCI_MAX_VQ];
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u32 gsis[VIRTIO_PCI_MAX_VQ];
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u32 msix_io_block;
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u64 msix_pba;
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struct msix_table msix_table[VIRTIO_PCI_MAX_VQ + VIRTIO_PCI_MAX_CONFIG];
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/* virtio queue */
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u16 queue_selector;
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struct virtio_pci_ioevent_param ioeventfds[VIRTIO_PCI_MAX_VQ];
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};
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int virtio_pci__signal_vq(struct kvm *kvm, struct virtio_device *vdev, u32 vq);
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int virtio_pci__signal_config(struct kvm *kvm, struct virtio_device *vdev);
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int virtio_pci__exit(struct kvm *kvm, struct virtio_device *vdev);
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int virtio_pci__init(struct kvm *kvm, void *dev, struct virtio_device *vdev,
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int device_id, int subsys_id, int class);
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#endif
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