s390/vfio-ap: handle config changed and scan complete notification
This patch implements two new AP driver callbacks:
void (*on_config_changed)(struct ap_config_info *new_config_info,
struct ap_config_info *old_config_info);
void (*on_scan_complete)(struct ap_config_info *new_config_info,
struct ap_config_info *old_config_info);
The on_config_changed callback is invoked at the start of the AP bus scan
function when it determines that the host AP configuration information
has changed since the previous scan.
The vfio_ap device driver registers a callback function for this callback
that performs the following operations:
1. Unplugs the adapters, domains and control domains removed from the
host's AP configuration from the guests to which they are
assigned in a single operation.
2. Stores bitmaps identifying the adapters, domains and control domains
added to the host's AP configuration with the structure representing
the mediated device. When the vfio_ap device driver's probe callback is
subsequently invoked, the probe function will recognize that the
queue is being probed due to a change in the host's AP configuration
and the plugging of the queue into the guest will be bypassed.
The on_scan_complete callback is invoked after the ap bus scan is
completed if the host AP configuration data has changed. The vfio_ap
device driver registers a callback function for this callback that hot
plugs each queue and control domain added to the AP configuration for each
guest using them in a single hot plug operation.
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Tony Krowiak
Alexander Gordeev
parent
f7f795c54d
commit
eeb386aeb5
3 changed files with 350 additions and 5 deletions
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@ -47,6 +47,8 @@ static struct ap_driver vfio_ap_drv = {
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.probe = vfio_ap_mdev_probe_queue,
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.probe = vfio_ap_mdev_probe_queue,
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.remove = vfio_ap_mdev_remove_queue,
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.remove = vfio_ap_mdev_remove_queue,
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.in_use = vfio_ap_mdev_resource_in_use,
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.in_use = vfio_ap_mdev_resource_in_use,
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.on_config_changed = vfio_ap_on_cfg_changed,
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.on_scan_complete = vfio_ap_on_scan_complete,
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.ids = ap_queue_ids,
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.ids = ap_queue_ids,
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};
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};
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@ -646,16 +646,11 @@ static bool vfio_ap_mdev_filter_cdoms(struct ap_matrix_mdev *matrix_mdev)
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static bool vfio_ap_mdev_filter_matrix(unsigned long *apm, unsigned long *aqm,
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static bool vfio_ap_mdev_filter_matrix(unsigned long *apm, unsigned long *aqm,
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struct ap_matrix_mdev *matrix_mdev)
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struct ap_matrix_mdev *matrix_mdev)
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{
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{
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int ret;
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unsigned long apid, apqi, apqn;
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unsigned long apid, apqi, apqn;
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DECLARE_BITMAP(prev_shadow_apm, AP_DEVICES);
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DECLARE_BITMAP(prev_shadow_apm, AP_DEVICES);
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DECLARE_BITMAP(prev_shadow_aqm, AP_DOMAINS);
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DECLARE_BITMAP(prev_shadow_aqm, AP_DOMAINS);
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struct vfio_ap_queue *q;
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struct vfio_ap_queue *q;
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ret = ap_qci(&matrix_dev->info);
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if (ret)
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return false;
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bitmap_copy(prev_shadow_apm, matrix_mdev->shadow_apcb.apm, AP_DEVICES);
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bitmap_copy(prev_shadow_apm, matrix_mdev->shadow_apcb.apm, AP_DEVICES);
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bitmap_copy(prev_shadow_aqm, matrix_mdev->shadow_apcb.aqm, AP_DOMAINS);
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bitmap_copy(prev_shadow_aqm, matrix_mdev->shadow_apcb.aqm, AP_DOMAINS);
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vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb);
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vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb);
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@ -1980,3 +1975,339 @@ int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm)
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return ret;
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return ret;
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}
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}
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/**
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* vfio_ap_mdev_hot_unplug_cfg - hot unplug the adapters, domains and control
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* domains that have been removed from the host's
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* AP configuration from a guest.
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*
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* @matrix_mdev: an ap_matrix_mdev object attached to a KVM guest.
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* @aprem: the adapters that have been removed from the host's AP configuration
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* @aqrem: the domains that have been removed from the host's AP configuration
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* @cdrem: the control domains that have been removed from the host's AP
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* configuration.
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*/
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static void vfio_ap_mdev_hot_unplug_cfg(struct ap_matrix_mdev *matrix_mdev,
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unsigned long *aprem,
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unsigned long *aqrem,
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unsigned long *cdrem)
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{
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int do_hotplug = 0;
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if (!bitmap_empty(aprem, AP_DEVICES)) {
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do_hotplug |= bitmap_andnot(matrix_mdev->shadow_apcb.apm,
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matrix_mdev->shadow_apcb.apm,
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aprem, AP_DEVICES);
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}
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if (!bitmap_empty(aqrem, AP_DOMAINS)) {
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do_hotplug |= bitmap_andnot(matrix_mdev->shadow_apcb.aqm,
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matrix_mdev->shadow_apcb.aqm,
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aqrem, AP_DEVICES);
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}
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if (!bitmap_empty(cdrem, AP_DOMAINS))
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do_hotplug |= bitmap_andnot(matrix_mdev->shadow_apcb.adm,
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matrix_mdev->shadow_apcb.adm,
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cdrem, AP_DOMAINS);
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if (do_hotplug)
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vfio_ap_mdev_update_guest_apcb(matrix_mdev);
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}
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/**
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* vfio_ap_mdev_cfg_remove - determines which guests are using the adapters,
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* domains and control domains that have been removed
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* from the host AP configuration and unplugs them
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* from those guests.
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*
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* @ap_remove: bitmap specifying which adapters have been removed from the host
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* config.
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* @aq_remove: bitmap specifying which domains have been removed from the host
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* config.
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* @cd_remove: bitmap specifying which control domains have been removed from
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* the host config.
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*/
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static void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove,
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unsigned long *aq_remove,
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unsigned long *cd_remove)
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{
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struct ap_matrix_mdev *matrix_mdev;
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DECLARE_BITMAP(aprem, AP_DEVICES);
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DECLARE_BITMAP(aqrem, AP_DOMAINS);
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DECLARE_BITMAP(cdrem, AP_DOMAINS);
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int do_remove = 0;
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list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
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mutex_lock(&matrix_mdev->kvm->lock);
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mutex_lock(&matrix_dev->mdevs_lock);
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do_remove |= bitmap_and(aprem, ap_remove,
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matrix_mdev->matrix.apm,
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AP_DEVICES);
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do_remove |= bitmap_and(aqrem, aq_remove,
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matrix_mdev->matrix.aqm,
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AP_DOMAINS);
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do_remove |= bitmap_andnot(cdrem, cd_remove,
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matrix_mdev->matrix.adm,
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AP_DOMAINS);
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if (do_remove)
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vfio_ap_mdev_hot_unplug_cfg(matrix_mdev, aprem, aqrem,
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cdrem);
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mutex_unlock(&matrix_dev->mdevs_lock);
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mutex_unlock(&matrix_mdev->kvm->lock);
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}
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}
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/**
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* vfio_ap_mdev_on_cfg_remove - responds to the removal of adapters, domains and
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* control domains from the host AP configuration
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* by unplugging them from the guests that are
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* using them.
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* @cur_config_info: the current host AP configuration information
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* @prev_config_info: the previous host AP configuration information
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*/
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static void vfio_ap_mdev_on_cfg_remove(struct ap_config_info *cur_config_info,
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struct ap_config_info *prev_config_info)
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{
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int do_remove;
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DECLARE_BITMAP(aprem, AP_DEVICES);
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DECLARE_BITMAP(aqrem, AP_DOMAINS);
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DECLARE_BITMAP(cdrem, AP_DOMAINS);
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do_remove = bitmap_andnot(aprem,
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(unsigned long *)prev_config_info->apm,
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(unsigned long *)cur_config_info->apm,
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AP_DEVICES);
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do_remove |= bitmap_andnot(aqrem,
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(unsigned long *)prev_config_info->aqm,
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(unsigned long *)cur_config_info->aqm,
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AP_DEVICES);
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do_remove |= bitmap_andnot(cdrem,
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(unsigned long *)prev_config_info->adm,
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(unsigned long *)cur_config_info->adm,
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AP_DEVICES);
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if (do_remove)
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vfio_ap_mdev_cfg_remove(aprem, aqrem, cdrem);
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}
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/**
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* vfio_ap_filter_apid_by_qtype: filter APIDs from an AP mask for adapters that
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* are older than AP type 10 (CEX4).
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* @apm: a bitmap of the APIDs to examine
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* @aqm: a bitmap of the APQIs of the queues to query for the AP type.
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*/
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static void vfio_ap_filter_apid_by_qtype(unsigned long *apm, unsigned long *aqm)
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{
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bool apid_cleared;
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struct ap_queue_status status;
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unsigned long apid, apqi, info;
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int qtype, qtype_mask = 0xff000000;
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for_each_set_bit_inv(apid, apm, AP_DEVICES) {
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apid_cleared = false;
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for_each_set_bit_inv(apqi, aqm, AP_DOMAINS) {
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status = ap_test_queue(AP_MKQID(apid, apqi), 1, &info);
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switch (status.response_code) {
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/*
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* According to the architecture in each case
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* below, the queue's info should be filled.
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*/
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case AP_RESPONSE_NORMAL:
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case AP_RESPONSE_RESET_IN_PROGRESS:
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case AP_RESPONSE_DECONFIGURED:
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case AP_RESPONSE_CHECKSTOPPED:
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case AP_RESPONSE_BUSY:
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qtype = info & qtype_mask;
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/*
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* The vfio_ap device driver only
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* supports CEX4 and newer adapters, so
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* remove the APID if the adapter is
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* older than a CEX4.
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*/
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if (qtype < AP_DEVICE_TYPE_CEX4) {
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clear_bit_inv(apid, apm);
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apid_cleared = true;
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}
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break;
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default:
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/*
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* If we don't know the adapter type,
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* clear its APID since it can't be
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* determined whether the vfio_ap
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* device driver supports it.
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*/
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clear_bit_inv(apid, apm);
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apid_cleared = true;
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break;
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}
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/*
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* If we've already cleared the APID from the apm, there
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* is no need to continue examining the remainin AP
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* queues to determine the type of the adapter.
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*/
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if (apid_cleared)
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continue;
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}
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}
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}
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/**
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* vfio_ap_mdev_cfg_add - store bitmaps specifying the adapters, domains and
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* control domains that have been added to the host's
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* AP configuration for each matrix mdev to which they
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* are assigned.
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*
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* @apm_add: a bitmap specifying the adapters that have been added to the AP
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* configuration.
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* @aqm_add: a bitmap specifying the domains that have been added to the AP
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* configuration.
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* @adm_add: a bitmap specifying the control domains that have been added to the
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* AP configuration.
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*/
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static void vfio_ap_mdev_cfg_add(unsigned long *apm_add, unsigned long *aqm_add,
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unsigned long *adm_add)
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{
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struct ap_matrix_mdev *matrix_mdev;
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if (list_empty(&matrix_dev->mdev_list))
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return;
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vfio_ap_filter_apid_by_qtype(apm_add, aqm_add);
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list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
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bitmap_and(matrix_mdev->apm_add,
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matrix_mdev->matrix.apm, apm_add, AP_DEVICES);
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bitmap_and(matrix_mdev->aqm_add,
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matrix_mdev->matrix.aqm, aqm_add, AP_DOMAINS);
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bitmap_and(matrix_mdev->adm_add,
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matrix_mdev->matrix.adm, adm_add, AP_DEVICES);
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}
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}
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/**
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* vfio_ap_mdev_on_cfg_add - responds to the addition of adapters, domains and
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* control domains to the host AP configuration
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* by updating the bitmaps that specify what adapters,
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* domains and control domains have been added so they
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* can be hot plugged into the guest when the AP bus
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* scan completes (see vfio_ap_on_scan_complete
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* function).
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* @cur_config_info: the current AP configuration information
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* @prev_config_info: the previous AP configuration information
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*/
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static void vfio_ap_mdev_on_cfg_add(struct ap_config_info *cur_config_info,
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struct ap_config_info *prev_config_info)
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{
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bool do_add;
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DECLARE_BITMAP(apm_add, AP_DEVICES);
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DECLARE_BITMAP(aqm_add, AP_DOMAINS);
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DECLARE_BITMAP(adm_add, AP_DOMAINS);
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do_add = bitmap_andnot(apm_add,
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(unsigned long *)cur_config_info->apm,
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(unsigned long *)prev_config_info->apm,
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AP_DEVICES);
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do_add |= bitmap_andnot(aqm_add,
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(unsigned long *)cur_config_info->aqm,
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(unsigned long *)prev_config_info->aqm,
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AP_DOMAINS);
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do_add |= bitmap_andnot(adm_add,
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(unsigned long *)cur_config_info->adm,
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(unsigned long *)prev_config_info->adm,
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AP_DOMAINS);
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if (do_add)
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vfio_ap_mdev_cfg_add(apm_add, aqm_add, adm_add);
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}
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/**
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* vfio_ap_on_cfg_changed - handles notification of changes to the host AP
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* configuration.
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*
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* @cur_cfg_info: the current host AP configuration
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* @prev_cfg_info: the previous host AP configuration
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*/
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void vfio_ap_on_cfg_changed(struct ap_config_info *cur_cfg_info,
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struct ap_config_info *prev_cfg_info)
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{
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if (!cur_cfg_info || !prev_cfg_info)
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return;
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mutex_lock(&matrix_dev->guests_lock);
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vfio_ap_mdev_on_cfg_remove(cur_cfg_info, prev_cfg_info);
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vfio_ap_mdev_on_cfg_add(cur_cfg_info, prev_cfg_info);
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memcpy(&matrix_dev->info, cur_cfg_info, sizeof(*cur_cfg_info));
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mutex_unlock(&matrix_dev->guests_lock);
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}
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static void vfio_ap_mdev_hot_plug_cfg(struct ap_matrix_mdev *matrix_mdev)
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{
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bool do_hotplug = false;
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int filter_domains = 0;
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int filter_adapters = 0;
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DECLARE_BITMAP(apm, AP_DEVICES);
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DECLARE_BITMAP(aqm, AP_DOMAINS);
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mutex_lock(&matrix_mdev->kvm->lock);
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mutex_lock(&matrix_dev->mdevs_lock);
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filter_adapters = bitmap_and(apm, matrix_mdev->matrix.apm,
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matrix_mdev->apm_add, AP_DEVICES);
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filter_domains = bitmap_and(aqm, matrix_mdev->matrix.aqm,
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matrix_mdev->aqm_add, AP_DOMAINS);
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if (filter_adapters && filter_domains)
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do_hotplug |= vfio_ap_mdev_filter_matrix(apm, aqm, matrix_mdev);
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else if (filter_adapters)
|
||||||
|
do_hotplug |=
|
||||||
|
vfio_ap_mdev_filter_matrix(apm,
|
||||||
|
matrix_mdev->shadow_apcb.aqm,
|
||||||
|
matrix_mdev);
|
||||||
|
else
|
||||||
|
do_hotplug |=
|
||||||
|
vfio_ap_mdev_filter_matrix(matrix_mdev->shadow_apcb.apm,
|
||||||
|
aqm, matrix_mdev);
|
||||||
|
|
||||||
|
if (bitmap_intersects(matrix_mdev->matrix.adm, matrix_mdev->adm_add,
|
||||||
|
AP_DOMAINS))
|
||||||
|
do_hotplug |= vfio_ap_mdev_filter_cdoms(matrix_mdev);
|
||||||
|
|
||||||
|
if (do_hotplug)
|
||||||
|
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
|
||||||
|
|
||||||
|
mutex_unlock(&matrix_dev->mdevs_lock);
|
||||||
|
mutex_unlock(&matrix_mdev->kvm->lock);
|
||||||
|
}
|
||||||
|
|
||||||
|
void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,
|
||||||
|
struct ap_config_info *old_config_info)
|
||||||
|
{
|
||||||
|
struct ap_matrix_mdev *matrix_mdev;
|
||||||
|
|
||||||
|
mutex_lock(&matrix_dev->guests_lock);
|
||||||
|
|
||||||
|
list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
|
||||||
|
if (bitmap_empty(matrix_mdev->apm_add, AP_DEVICES) &&
|
||||||
|
bitmap_empty(matrix_mdev->aqm_add, AP_DOMAINS) &&
|
||||||
|
bitmap_empty(matrix_mdev->adm_add, AP_DOMAINS))
|
||||||
|
continue;
|
||||||
|
|
||||||
|
vfio_ap_mdev_hot_plug_cfg(matrix_mdev);
|
||||||
|
bitmap_clear(matrix_mdev->apm_add, 0, AP_DEVICES);
|
||||||
|
bitmap_clear(matrix_mdev->aqm_add, 0, AP_DOMAINS);
|
||||||
|
bitmap_clear(matrix_mdev->adm_add, 0, AP_DOMAINS);
|
||||||
|
}
|
||||||
|
|
||||||
|
mutex_unlock(&matrix_dev->guests_lock);
|
||||||
|
}
|
||||||
|
|
|
||||||
|
|
@ -105,6 +105,10 @@ struct ap_queue_table {
|
||||||
* PQAP(AQIC) instruction.
|
* PQAP(AQIC) instruction.
|
||||||
* @mdev: the mediated device
|
* @mdev: the mediated device
|
||||||
* @qtable: table of queues (struct vfio_ap_queue) assigned to the mdev
|
* @qtable: table of queues (struct vfio_ap_queue) assigned to the mdev
|
||||||
|
* @apm_add: bitmap of APIDs added to the host's AP configuration
|
||||||
|
* @aqm_add: bitmap of APQIs added to the host's AP configuration
|
||||||
|
* @adm_add: bitmap of control domain numbers added to the host's AP
|
||||||
|
* configuration
|
||||||
*/
|
*/
|
||||||
struct ap_matrix_mdev {
|
struct ap_matrix_mdev {
|
||||||
struct vfio_device vdev;
|
struct vfio_device vdev;
|
||||||
|
|
@ -116,6 +120,9 @@ struct ap_matrix_mdev {
|
||||||
crypto_hook pqap_hook;
|
crypto_hook pqap_hook;
|
||||||
struct mdev_device *mdev;
|
struct mdev_device *mdev;
|
||||||
struct ap_queue_table qtable;
|
struct ap_queue_table qtable;
|
||||||
|
DECLARE_BITMAP(apm_add, AP_DEVICES);
|
||||||
|
DECLARE_BITMAP(aqm_add, AP_DOMAINS);
|
||||||
|
DECLARE_BITMAP(adm_add, AP_DOMAINS);
|
||||||
};
|
};
|
||||||
|
|
||||||
/**
|
/**
|
||||||
|
|
@ -146,4 +153,9 @@ void vfio_ap_mdev_remove_queue(struct ap_device *queue);
|
||||||
|
|
||||||
int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);
|
int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);
|
||||||
|
|
||||||
|
void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,
|
||||||
|
struct ap_config_info *old_config_info);
|
||||||
|
void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,
|
||||||
|
struct ap_config_info *old_config_info);
|
||||||
|
|
||||||
#endif /* _VFIO_AP_PRIVATE_H_ */
|
#endif /* _VFIO_AP_PRIVATE_H_ */
|
||||||
|
|
|
||||||
Loading…
Add table
Reference in a new issue