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David Alan Gilbert" , Claudio Fontana , Julien Grall , "Michael S. Tsirkin" , Marcel Apfelbaum , armbru@redhat.com, Stefano Stabellini , vikram.garhwal@amd.com Subject: [PATCH v15 33/60] hw/xen: Implement EVTCHNOP_bind_ipi Date: Wed, 1 Mar 2023 13:51:56 +0000 Message-Id: <20230301135223.988336-34-dwmw2@infradead.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230301135223.988336-1-dwmw2@infradead.org> References: <20230301135223.988336-1-dwmw2@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. 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charset="utf-8" From: David Woodhouse Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant --- hw/i386/kvm/xen_evtchn.c | 69 +++++++++++++++++++++++++++++++++++++++ hw/i386/kvm/xen_evtchn.h | 2 ++ target/i386/kvm/xen-emu.c | 15 +++++++++ 3 files changed, 86 insertions(+) diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c index a3202d39ab..eea80dc0f5 100644 --- a/hw/i386/kvm/xen_evtchn.c +++ b/hw/i386/kvm/xen_evtchn.c @@ -13,6 +13,7 @@ #include "qemu/host-utils.h" #include "qemu/module.h" #include "qemu/main-loop.h" +#include "qemu/log.h" #include "qapi/error.h" #include "qom/object.h" #include "exec/target_page.h" @@ -231,6 +232,43 @@ static void inject_callback(XenEvtchnState *s, uint32_= t vcpu) kvm_xen_inject_vcpu_callback_vector(vcpu, type); } =20 +static void deassign_kernel_port(evtchn_port_t port) +{ + struct kvm_xen_hvm_attr ha; + int ret; + + ha.type =3D KVM_XEN_ATTR_TYPE_EVTCHN; + ha.u.evtchn.send_port =3D port; + ha.u.evtchn.flags =3D KVM_XEN_EVTCHN_DEASSIGN; + + ret =3D kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_SET_ATTR, &ha); + if (ret) { + qemu_log_mask(LOG_GUEST_ERROR, "Failed to unbind kernel port %d: %= s\n", + port, strerror(ret)); + } +} + +static int assign_kernel_port(uint16_t type, evtchn_port_t port, + uint32_t vcpu_id) +{ + CPUState *cpu =3D qemu_get_cpu(vcpu_id); + struct kvm_xen_hvm_attr ha; + + if (!cpu) { + return -ENOENT; + } + + ha.type =3D KVM_XEN_ATTR_TYPE_EVTCHN; + ha.u.evtchn.send_port =3D port; + ha.u.evtchn.type =3D type; + ha.u.evtchn.flags =3D 0; + ha.u.evtchn.deliver.port.port =3D port; + ha.u.evtchn.deliver.port.vcpu =3D kvm_arch_vcpu_id(cpu); + ha.u.evtchn.deliver.port.priority =3D KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_= 2LEVEL; + + return kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_SET_ATTR, &ha); +} + static bool valid_port(evtchn_port_t port) { if (!port) { @@ -551,6 +589,12 @@ static int close_port(XenEvtchnState *s, evtchn_port_t= port) p->type_val, 0); break; =20 + case EVTCHNSTAT_ipi: + if (s->evtchn_in_kernel) { + deassign_kernel_port(port); + } + break; + default: break; } @@ -640,3 +684,28 @@ int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *v= irq) =20 return ret; } + +int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi) +{ + XenEvtchnState *s =3D xen_evtchn_singleton; + int ret; + + if (!s) { + return -ENOTSUP; + } + + if (!valid_vcpu(ipi->vcpu)) { + return -ENOENT; + } + + qemu_mutex_lock(&s->port_lock); + + ret =3D allocate_port(s, ipi->vcpu, EVTCHNSTAT_ipi, 0, &ipi->port); + if (!ret && s->evtchn_in_kernel) { + assign_kernel_port(EVTCHNSTAT_ipi, ipi->port, ipi->vcpu); + } + + qemu_mutex_unlock(&s->port_lock); + + return ret; +} diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h index 0ea13dda3a..107f420848 100644 --- a/hw/i386/kvm/xen_evtchn.h +++ b/hw/i386/kvm/xen_evtchn.h @@ -19,9 +19,11 @@ struct evtchn_status; struct evtchn_close; struct evtchn_unmask; struct evtchn_bind_virq; +struct evtchn_bind_ipi; int xen_evtchn_status_op(struct evtchn_status *status); int xen_evtchn_close_op(struct evtchn_close *close); int xen_evtchn_unmask_op(struct evtchn_unmask *unmask); int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *virq); +int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi); =20 #endif /* QEMU_XEN_EVTCHN_H */ diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c index e0417f3d13..b8b439dd31 100644 --- a/target/i386/kvm/xen-emu.c +++ b/target/i386/kvm/xen-emu.c @@ -894,6 +894,21 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exi= t *exit, X86CPU *cpu, } break; } + case EVTCHNOP_bind_ipi: { + struct evtchn_bind_ipi ipi; + + qemu_build_assert(sizeof(ipi) =3D=3D 8); + if (kvm_copy_from_gva(cs, arg, &ipi, sizeof(ipi))) { + err =3D -EFAULT; + break; + } + + err =3D xen_evtchn_bind_ipi_op(&ipi); + if (!err && kvm_copy_to_gva(cs, arg, &ipi, sizeof(ipi))) { + err =3D -EFAULT; + } + break; + } default: return false; } --=20 2.39.0