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I initially put the basic platform init (overlay pages, grant tables, event channels) into mc->kvm_type because that was the earliest place that could sensibly test for xen_mode==XEN_EMULATE. The intent was to do this early enough that we could then initialise the XenBus and other parts which would have depended on them, from a generic location for both Xen and KVM/Xen in the PC-specific code, as seen in https://lore.kernel.org/qemu-devel/20230116221919.1124201-16-dwmw2@infradead.org/ However, then the Xen on Arm patches came along, and *they* wanted to do the XenBus init from a 'generic' Xen-specific location instead: https://lore.kernel.org/qemu-devel/20230210222729.957168-4-sstabellini@kernel.org/ Since there's no generic location that covers all three, I conceded to do it for XEN_EMULATE mode in pc_basic_devices_init(). And now there's absolutely no point in having some of the platform init done from pc_machine_kvm_type(); we can move it all up to live in a single place in pc_basic_devices_init(). This has the added benefit that we can drop the separate xen_evtchn_connect_gsis() function completely, and pass just the system GSIs in directly to xen_evtchn_create(). While I'm at it, it does no harm to explicitly pass in the *number* of said GSIs, because it does make me twitch a bit to pass an array of impicit size. During the lifetime of the KVM/Xen patchset, that had already changed (albeit just cosmetically) from GSI_NUM_PINS to IOAPIC_NUM_PINS. And document a bit better that this is for the *output* GSI for raising CPU0's events when the per-CPU vector isn't available. The fact that we create a whole set of them and then only waggle the one we're told to, instead of having a single output and only *connecting* it to the GSI that it should be connected to, is still non-intuitive for me. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org> Message-Id: <20230412185102.441523-2-dwmw2@infradead.org> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
88 lines
3.3 KiB
C
88 lines
3.3 KiB
C
/*
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* QEMU Xen emulation: Event channel support
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*
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* Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Authors: David Woodhouse <dwmw2@infradead.org>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_XEN_EVTCHN_H
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#define QEMU_XEN_EVTCHN_H
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#include "hw/sysbus.h"
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typedef uint32_t evtchn_port_t;
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void xen_evtchn_create(unsigned int nr_gsis, qemu_irq *system_gsis);
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int xen_evtchn_soft_reset(void);
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int xen_evtchn_set_callback_param(uint64_t param);
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void xen_evtchn_set_callback_level(int level);
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int xen_evtchn_set_port(uint16_t port);
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bool xen_evtchn_set_gsi(int gsi, int level);
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void xen_evtchn_snoop_msi(PCIDevice *dev, bool is_msix, unsigned int vector,
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uint64_t addr, uint32_t data, bool is_masked);
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void xen_evtchn_remove_pci_device(PCIDevice *dev);
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struct kvm_irq_routing_entry;
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int xen_evtchn_translate_pirq_msi(struct kvm_irq_routing_entry *route,
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uint64_t address, uint32_t data);
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bool xen_evtchn_deliver_pirq_msi(uint64_t address, uint32_t data);
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/*
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* These functions mirror the libxenevtchn library API, providing the QEMU
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* backend side of "interdomain" event channels.
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*/
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struct xenevtchn_handle;
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struct xenevtchn_handle *xen_be_evtchn_open(void);
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int xen_be_evtchn_bind_interdomain(struct xenevtchn_handle *xc, uint32_t domid,
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evtchn_port_t guest_port);
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int xen_be_evtchn_unbind(struct xenevtchn_handle *xc, evtchn_port_t port);
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int xen_be_evtchn_close(struct xenevtchn_handle *xc);
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int xen_be_evtchn_fd(struct xenevtchn_handle *xc);
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int xen_be_evtchn_notify(struct xenevtchn_handle *xc, evtchn_port_t port);
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int xen_be_evtchn_unmask(struct xenevtchn_handle *xc, evtchn_port_t port);
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int xen_be_evtchn_pending(struct xenevtchn_handle *xc);
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/* Apart from this which is a local addition */
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int xen_be_evtchn_get_guest_port(struct xenevtchn_handle *xc);
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struct evtchn_status;
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struct evtchn_close;
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struct evtchn_unmask;
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struct evtchn_bind_virq;
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struct evtchn_bind_pirq;
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struct evtchn_bind_ipi;
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struct evtchn_send;
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struct evtchn_alloc_unbound;
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struct evtchn_bind_interdomain;
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struct evtchn_bind_vcpu;
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struct evtchn_reset;
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int xen_evtchn_status_op(struct evtchn_status *status);
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int xen_evtchn_close_op(struct evtchn_close *close);
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int xen_evtchn_unmask_op(struct evtchn_unmask *unmask);
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int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *virq);
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int xen_evtchn_bind_pirq_op(struct evtchn_bind_pirq *pirq);
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int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi);
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int xen_evtchn_send_op(struct evtchn_send *send);
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int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc);
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int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain);
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int xen_evtchn_bind_vcpu_op(struct evtchn_bind_vcpu *vcpu);
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int xen_evtchn_reset_op(struct evtchn_reset *reset);
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struct physdev_map_pirq;
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struct physdev_unmap_pirq;
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struct physdev_eoi;
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struct physdev_irq_status_query;
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struct physdev_get_free_pirq;
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int xen_physdev_map_pirq(struct physdev_map_pirq *map);
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int xen_physdev_unmap_pirq(struct physdev_unmap_pirq *unmap);
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int xen_physdev_eoi_pirq(struct physdev_eoi *eoi);
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int xen_physdev_query_pirq(struct physdev_irq_status_query *query);
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int xen_physdev_get_free_pirq(struct physdev_get_free_pirq *get);
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#endif /* QEMU_XEN_EVTCHN_H */
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