| Message ID | 20160713015909.28793-6-andre.przywara@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 13/07/2016 03:58, Andre Przywara wrote: > The kvm_io_bus framework is a nice place of holding information about > various MMIO regions for kernel emulated devices. > Add a call to retrieve the kvm_io_device structure which is associated > with a certain MMIO address. This avoids to duplicate kvm_io_bus' > knowledge of MMIO regions without having to fake MMIO calls if a user > needs the device a certain MMIO address belongs to. > This will be used by the ITS emulation to get the associated ITS device > when someone triggers an MSI via an ioctl from userspace. > > Signed-off-by: Andre Przywara <andre.przywara@arm.com> > Reviewed-by: Eric Auger <eric.auger@redhat.com> > Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Acked-by: Paolo Bonzini <pbonzini@redhat.com> > --- > include/linux/kvm_host.h | 2 ++ > virt/kvm/kvm_main.c | 24 ++++++++++++++++++++++++ > 2 files changed, 26 insertions(+) > > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > index 0640ee9..614a981 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -164,6 +164,8 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, > int len, struct kvm_io_device *dev); > int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, > struct kvm_io_device *dev); > +struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, > + gpa_t addr); > > #ifdef CONFIG_KVM_ASYNC_PF > struct kvm_async_pf { > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index ef54b4c..bd2eb92 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -3496,6 +3496,30 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, > return r; > } > > +struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, > + gpa_t addr) > +{ > + struct kvm_io_bus *bus; > + int dev_idx, srcu_idx; > + struct kvm_io_device *iodev = NULL; > + > + srcu_idx = srcu_read_lock(&kvm->srcu); > + > + bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); > + > + dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); > + if (dev_idx < 0) > + goto out_unlock; > + > + iodev = bus->range[dev_idx].dev; > + > +out_unlock: > + srcu_read_unlock(&kvm->srcu, srcu_idx); > + > + return iodev; > +} > +EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); > + > static struct notifier_block kvm_cpu_notifier = { > .notifier_call = kvm_cpu_hotplug, > }; >
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 0640ee9..614a981 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -164,6 +164,8 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len, struct kvm_io_device *dev); int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, struct kvm_io_device *dev); +struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, + gpa_t addr); #ifdef CONFIG_KVM_ASYNC_PF struct kvm_async_pf { diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index ef54b4c..bd2eb92 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3496,6 +3496,30 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, return r; } +struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, + gpa_t addr) +{ + struct kvm_io_bus *bus; + int dev_idx, srcu_idx; + struct kvm_io_device *iodev = NULL; + + srcu_idx = srcu_read_lock(&kvm->srcu); + + bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); + + dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); + if (dev_idx < 0) + goto out_unlock; + + iodev = bus->range[dev_idx].dev; + +out_unlock: + srcu_read_unlock(&kvm->srcu, srcu_idx); + + return iodev; +} +EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); + static struct notifier_block kvm_cpu_notifier = { .notifier_call = kvm_cpu_hotplug, };