12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004100510061007100810091010101110121013101410151016101710181019102010211022102310241025102610271028102910301031103210331034103510361037103810391040104110421043104410451046104710481049105010511052105310541055105610571058105910601061106210631064106510661067106810691070107110721073107410751076107710781079108010811082108310841085108610871088108910901091109210931094109510961097109810991100110111021103110411051106110711081109111011111112111311141115111611171118111911201121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190119111921193119411951196119711981199120012011202120312041205120612071208120912101211121212131214121512161217121812191220122112221223122412251226122712281229123012311232123312341235123612371238123912401241124212431244124512461247124812491250125112521253125412551256125712581259126012611262126312641265126612671268126912701271127212731274127512761277127812791280128112821283128412851286128712881289129012911292129312941295129612971298129913001301130213031304130513061307130813091310131113121313131413151316131713181319132013211322132313241325132613271328 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Adjunct processor matrix VFIO device driver callbacks.
- *
- * Copyright IBM Corp. 2018
- *
- * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
- * Halil Pasic <pasic@linux.ibm.com>
- * Pierre Morel <pmorel@linux.ibm.com>
- */
- #include <linux/string.h>
- #include <linux/vfio.h>
- #include <linux/device.h>
- #include <linux/list.h>
- #include <linux/ctype.h>
- #include <linux/bitops.h>
- #include <linux/kvm_host.h>
- #include <linux/module.h>
- #include <asm/kvm.h>
- #include <asm/zcrypt.h>
- #include "vfio_ap_private.h"
- #define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough"
- #define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device"
- static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev);
- static struct vfio_ap_queue *vfio_ap_find_queue(int apqn);
- static int match_apqn(struct device *dev, const void *data)
- {
- struct vfio_ap_queue *q = dev_get_drvdata(dev);
- return (q->apqn == *(int *)(data)) ? 1 : 0;
- }
- /**
- * vfio_ap_get_queue: Retrieve a queue with a specific APQN from a list
- * @matrix_mdev: the associated mediated matrix
- * @apqn: The queue APQN
- *
- * Retrieve a queue with a specific APQN from the list of the
- * devices of the vfio_ap_drv.
- * Verify that the APID and the APQI are set in the matrix.
- *
- * Returns the pointer to the associated vfio_ap_queue
- */
- static struct vfio_ap_queue *vfio_ap_get_queue(
- struct ap_matrix_mdev *matrix_mdev,
- int apqn)
- {
- struct vfio_ap_queue *q;
- if (!test_bit_inv(AP_QID_CARD(apqn), matrix_mdev->matrix.apm))
- return NULL;
- if (!test_bit_inv(AP_QID_QUEUE(apqn), matrix_mdev->matrix.aqm))
- return NULL;
- q = vfio_ap_find_queue(apqn);
- if (q)
- q->matrix_mdev = matrix_mdev;
- return q;
- }
- /**
- * vfio_ap_wait_for_irqclear
- * @apqn: The AP Queue number
- *
- * Checks the IRQ bit for the status of this APQN using ap_tapq.
- * Returns if the ap_tapq function succeeded and the bit is clear.
- * Returns if ap_tapq function failed with invalid, deconfigured or
- * checkstopped AP.
- * Otherwise retries up to 5 times after waiting 20ms.
- *
- */
- static void vfio_ap_wait_for_irqclear(int apqn)
- {
- struct ap_queue_status status;
- int retry = 5;
- do {
- status = ap_tapq(apqn, NULL);
- switch (status.response_code) {
- case AP_RESPONSE_NORMAL:
- case AP_RESPONSE_RESET_IN_PROGRESS:
- if (!status.irq_enabled)
- return;
- fallthrough;
- case AP_RESPONSE_BUSY:
- msleep(20);
- break;
- case AP_RESPONSE_Q_NOT_AVAIL:
- case AP_RESPONSE_DECONFIGURED:
- case AP_RESPONSE_CHECKSTOPPED:
- default:
- WARN_ONCE(1, "%s: tapq rc %02x: %04x\n", __func__,
- status.response_code, apqn);
- return;
- }
- } while (--retry);
- WARN_ONCE(1, "%s: tapq rc %02x: %04x could not clear IR bit\n",
- __func__, status.response_code, apqn);
- }
- /**
- * vfio_ap_free_aqic_resources
- * @q: The vfio_ap_queue
- *
- * Unregisters the ISC in the GIB when the saved ISC not invalid.
- * Unpin the guest's page holding the NIB when it exist.
- * Reset the saved_pfn and saved_isc to invalid values.
- *
- */
- static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
- {
- if (!q)
- return;
- if (q->saved_isc != VFIO_AP_ISC_INVALID &&
- !WARN_ON(!(q->matrix_mdev && q->matrix_mdev->kvm))) {
- kvm_s390_gisc_unregister(q->matrix_mdev->kvm, q->saved_isc);
- q->saved_isc = VFIO_AP_ISC_INVALID;
- }
- if (q->saved_pfn && !WARN_ON(!q->matrix_mdev)) {
- vfio_unpin_pages(mdev_dev(q->matrix_mdev->mdev),
- &q->saved_pfn, 1);
- q->saved_pfn = 0;
- }
- }
- /**
- * vfio_ap_irq_disable
- * @q: The vfio_ap_queue
- *
- * Uses ap_aqic to disable the interruption and in case of success, reset
- * in progress or IRQ disable command already proceeded: calls
- * vfio_ap_wait_for_irqclear() to check for the IRQ bit to be clear
- * and calls vfio_ap_free_aqic_resources() to free the resources associated
- * with the AP interrupt handling.
- *
- * In the case the AP is busy, or a reset is in progress,
- * retries after 20ms, up to 5 times.
- *
- * Returns if ap_aqic function failed with invalid, deconfigured or
- * checkstopped AP.
- */
- static struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q)
- {
- struct ap_qirq_ctrl aqic_gisa = {};
- struct ap_queue_status status;
- int retries = 5;
- do {
- status = ap_aqic(q->apqn, aqic_gisa, NULL);
- switch (status.response_code) {
- case AP_RESPONSE_OTHERWISE_CHANGED:
- case AP_RESPONSE_NORMAL:
- vfio_ap_wait_for_irqclear(q->apqn);
- goto end_free;
- case AP_RESPONSE_RESET_IN_PROGRESS:
- case AP_RESPONSE_BUSY:
- msleep(20);
- break;
- case AP_RESPONSE_Q_NOT_AVAIL:
- case AP_RESPONSE_DECONFIGURED:
- case AP_RESPONSE_CHECKSTOPPED:
- case AP_RESPONSE_INVALID_ADDRESS:
- default:
- /* All cases in default means AP not operational */
- WARN_ONCE(1, "%s: ap_aqic status %d\n", __func__,
- status.response_code);
- goto end_free;
- }
- } while (retries--);
- WARN_ONCE(1, "%s: ap_aqic status %d\n", __func__,
- status.response_code);
- end_free:
- vfio_ap_free_aqic_resources(q);
- q->matrix_mdev = NULL;
- return status;
- }
- /**
- * vfio_ap_setirq: Enable Interruption for a APQN
- *
- * @dev: the device associated with the ap_queue
- * @q: the vfio_ap_queue holding AQIC parameters
- *
- * Pin the NIB saved in *q
- * Register the guest ISC to GIB interface and retrieve the
- * host ISC to issue the host side PQAP/AQIC
- *
- * Response.status may be set to AP_RESPONSE_INVALID_ADDRESS in case the
- * vfio_pin_pages failed.
- *
- * Otherwise return the ap_queue_status returned by the ap_aqic(),
- * all retry handling will be done by the guest.
- */
- static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
- int isc,
- unsigned long nib)
- {
- struct ap_qirq_ctrl aqic_gisa = {};
- struct ap_queue_status status = {};
- struct kvm_s390_gisa *gisa;
- struct kvm *kvm;
- unsigned long h_nib, g_pfn, h_pfn;
- int ret;
- g_pfn = nib >> PAGE_SHIFT;
- ret = vfio_pin_pages(mdev_dev(q->matrix_mdev->mdev), &g_pfn, 1,
- IOMMU_READ | IOMMU_WRITE, &h_pfn);
- switch (ret) {
- case 1:
- break;
- default:
- status.response_code = AP_RESPONSE_INVALID_ADDRESS;
- return status;
- }
- kvm = q->matrix_mdev->kvm;
- gisa = kvm->arch.gisa_int.origin;
- h_nib = (h_pfn << PAGE_SHIFT) | (nib & ~PAGE_MASK);
- aqic_gisa.gisc = isc;
- aqic_gisa.isc = kvm_s390_gisc_register(kvm, isc);
- aqic_gisa.ir = 1;
- aqic_gisa.gisa = (uint64_t)gisa >> 4;
- status = ap_aqic(q->apqn, aqic_gisa, (void *)h_nib);
- switch (status.response_code) {
- case AP_RESPONSE_NORMAL:
- /* See if we did clear older IRQ configuration */
- vfio_ap_free_aqic_resources(q);
- q->saved_pfn = g_pfn;
- q->saved_isc = isc;
- break;
- case AP_RESPONSE_OTHERWISE_CHANGED:
- /* We could not modify IRQ setings: clear new configuration */
- vfio_unpin_pages(mdev_dev(q->matrix_mdev->mdev), &g_pfn, 1);
- kvm_s390_gisc_unregister(kvm, isc);
- break;
- default:
- pr_warn("%s: apqn %04x: response: %02x\n", __func__, q->apqn,
- status.response_code);
- vfio_ap_irq_disable(q);
- break;
- }
- return status;
- }
- /**
- * handle_pqap: PQAP instruction callback
- *
- * @vcpu: The vcpu on which we received the PQAP instruction
- *
- * Get the general register contents to initialize internal variables.
- * REG[0]: APQN
- * REG[1]: IR and ISC
- * REG[2]: NIB
- *
- * Response.status may be set to following Response Code:
- * - AP_RESPONSE_Q_NOT_AVAIL: if the queue is not available
- * - AP_RESPONSE_DECONFIGURED: if the queue is not configured
- * - AP_RESPONSE_NORMAL (0) : in case of successs
- * Check vfio_ap_setirq() and vfio_ap_clrirq() for other possible RC.
- * We take the matrix_dev lock to ensure serialization on queues and
- * mediated device access.
- *
- * Return 0 if we could handle the request inside KVM.
- * otherwise, returns -EOPNOTSUPP to let QEMU handle the fault.
- */
- static int handle_pqap(struct kvm_vcpu *vcpu)
- {
- uint64_t status;
- uint16_t apqn;
- struct vfio_ap_queue *q;
- struct ap_queue_status qstatus = {
- .response_code = AP_RESPONSE_Q_NOT_AVAIL, };
- struct ap_matrix_mdev *matrix_mdev;
- /* If we do not use the AIV facility just go to userland */
- if (!(vcpu->arch.sie_block->eca & ECA_AIV))
- return -EOPNOTSUPP;
- apqn = vcpu->run->s.regs.gprs[0] & 0xffff;
- mutex_lock(&matrix_dev->lock);
- if (!vcpu->kvm->arch.crypto.pqap_hook)
- goto out_unlock;
- matrix_mdev = container_of(vcpu->kvm->arch.crypto.pqap_hook,
- struct ap_matrix_mdev, pqap_hook);
- q = vfio_ap_get_queue(matrix_mdev, apqn);
- if (!q)
- goto out_unlock;
- status = vcpu->run->s.regs.gprs[1];
- /* If IR bit(16) is set we enable the interrupt */
- if ((status >> (63 - 16)) & 0x01)
- qstatus = vfio_ap_irq_enable(q, status & 0x07,
- vcpu->run->s.regs.gprs[2]);
- else
- qstatus = vfio_ap_irq_disable(q);
- out_unlock:
- memcpy(&vcpu->run->s.regs.gprs[1], &qstatus, sizeof(qstatus));
- vcpu->run->s.regs.gprs[1] >>= 32;
- mutex_unlock(&matrix_dev->lock);
- return 0;
- }
- static void vfio_ap_matrix_init(struct ap_config_info *info,
- struct ap_matrix *matrix)
- {
- matrix->apm_max = info->apxa ? info->Na : 63;
- matrix->aqm_max = info->apxa ? info->Nd : 15;
- matrix->adm_max = info->apxa ? info->Nd : 15;
- }
- static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
- {
- struct ap_matrix_mdev *matrix_mdev;
- if ((atomic_dec_if_positive(&matrix_dev->available_instances) < 0))
- return -EPERM;
- matrix_mdev = kzalloc(sizeof(*matrix_mdev), GFP_KERNEL);
- if (!matrix_mdev) {
- atomic_inc(&matrix_dev->available_instances);
- return -ENOMEM;
- }
- matrix_mdev->mdev = mdev;
- vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
- mdev_set_drvdata(mdev, matrix_mdev);
- matrix_mdev->pqap_hook.hook = handle_pqap;
- matrix_mdev->pqap_hook.owner = THIS_MODULE;
- mutex_lock(&matrix_dev->lock);
- list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
- mutex_unlock(&matrix_dev->lock);
- return 0;
- }
- static int vfio_ap_mdev_remove(struct mdev_device *mdev)
- {
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- if (matrix_mdev->kvm)
- return -EBUSY;
- mutex_lock(&matrix_dev->lock);
- vfio_ap_mdev_reset_queues(mdev);
- list_del(&matrix_mdev->node);
- mutex_unlock(&matrix_dev->lock);
- kfree(matrix_mdev);
- mdev_set_drvdata(mdev, NULL);
- atomic_inc(&matrix_dev->available_instances);
- return 0;
- }
- static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
- {
- return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);
- }
- static MDEV_TYPE_ATTR_RO(name);
- static ssize_t available_instances_show(struct kobject *kobj,
- struct device *dev, char *buf)
- {
- return sprintf(buf, "%d\n",
- atomic_read(&matrix_dev->available_instances));
- }
- static MDEV_TYPE_ATTR_RO(available_instances);
- static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
- char *buf)
- {
- return sprintf(buf, "%s\n", VFIO_DEVICE_API_AP_STRING);
- }
- static MDEV_TYPE_ATTR_RO(device_api);
- static struct attribute *vfio_ap_mdev_type_attrs[] = {
- &mdev_type_attr_name.attr,
- &mdev_type_attr_device_api.attr,
- &mdev_type_attr_available_instances.attr,
- NULL,
- };
- static struct attribute_group vfio_ap_mdev_hwvirt_type_group = {
- .name = VFIO_AP_MDEV_TYPE_HWVIRT,
- .attrs = vfio_ap_mdev_type_attrs,
- };
- static struct attribute_group *vfio_ap_mdev_type_groups[] = {
- &vfio_ap_mdev_hwvirt_type_group,
- NULL,
- };
- struct vfio_ap_queue_reserved {
- unsigned long *apid;
- unsigned long *apqi;
- bool reserved;
- };
- /**
- * vfio_ap_has_queue
- *
- * @dev: an AP queue device
- * @data: a struct vfio_ap_queue_reserved reference
- *
- * Flags whether the AP queue device (@dev) has a queue ID containing the APQN,
- * apid or apqi specified in @data:
- *
- * - If @data contains both an apid and apqi value, then @data will be flagged
- * as reserved if the APID and APQI fields for the AP queue device matches
- *
- * - If @data contains only an apid value, @data will be flagged as
- * reserved if the APID field in the AP queue device matches
- *
- * - If @data contains only an apqi value, @data will be flagged as
- * reserved if the APQI field in the AP queue device matches
- *
- * Returns 0 to indicate the input to function succeeded. Returns -EINVAL if
- * @data does not contain either an apid or apqi.
- */
- static int vfio_ap_has_queue(struct device *dev, void *data)
- {
- struct vfio_ap_queue_reserved *qres = data;
- struct ap_queue *ap_queue = to_ap_queue(dev);
- ap_qid_t qid;
- unsigned long id;
- if (qres->apid && qres->apqi) {
- qid = AP_MKQID(*qres->apid, *qres->apqi);
- if (qid == ap_queue->qid)
- qres->reserved = true;
- } else if (qres->apid && !qres->apqi) {
- id = AP_QID_CARD(ap_queue->qid);
- if (id == *qres->apid)
- qres->reserved = true;
- } else if (!qres->apid && qres->apqi) {
- id = AP_QID_QUEUE(ap_queue->qid);
- if (id == *qres->apqi)
- qres->reserved = true;
- } else {
- return -EINVAL;
- }
- return 0;
- }
- /**
- * vfio_ap_verify_queue_reserved
- *
- * @matrix_dev: a mediated matrix device
- * @apid: an AP adapter ID
- * @apqi: an AP queue index
- *
- * Verifies that the AP queue with @apid/@apqi is reserved by the VFIO AP device
- * driver according to the following rules:
- *
- * - If both @apid and @apqi are not NULL, then there must be an AP queue
- * device bound to the vfio_ap driver with the APQN identified by @apid and
- * @apqi
- *
- * - If only @apid is not NULL, then there must be an AP queue device bound
- * to the vfio_ap driver with an APQN containing @apid
- *
- * - If only @apqi is not NULL, then there must be an AP queue device bound
- * to the vfio_ap driver with an APQN containing @apqi
- *
- * Returns 0 if the AP queue is reserved; otherwise, returns -EADDRNOTAVAIL.
- */
- static int vfio_ap_verify_queue_reserved(unsigned long *apid,
- unsigned long *apqi)
- {
- int ret;
- struct vfio_ap_queue_reserved qres;
- qres.apid = apid;
- qres.apqi = apqi;
- qres.reserved = false;
- ret = driver_for_each_device(&matrix_dev->vfio_ap_drv->driver, NULL,
- &qres, vfio_ap_has_queue);
- if (ret)
- return ret;
- if (qres.reserved)
- return 0;
- return -EADDRNOTAVAIL;
- }
- static int
- vfio_ap_mdev_verify_queues_reserved_for_apid(struct ap_matrix_mdev *matrix_mdev,
- unsigned long apid)
- {
- int ret;
- unsigned long apqi;
- unsigned long nbits = matrix_mdev->matrix.aqm_max + 1;
- if (find_first_bit_inv(matrix_mdev->matrix.aqm, nbits) >= nbits)
- return vfio_ap_verify_queue_reserved(&apid, NULL);
- for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, nbits) {
- ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
- if (ret)
- return ret;
- }
- return 0;
- }
- /**
- * vfio_ap_mdev_verify_no_sharing
- *
- * Verifies that the APQNs derived from the cross product of the AP adapter IDs
- * and AP queue indexes comprising the AP matrix are not configured for another
- * mediated device. AP queue sharing is not allowed.
- *
- * @matrix_mdev: the mediated matrix device
- *
- * Returns 0 if the APQNs are not shared, otherwise; returns -EADDRINUSE.
- */
- static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev)
- {
- struct ap_matrix_mdev *lstdev;
- DECLARE_BITMAP(apm, AP_DEVICES);
- DECLARE_BITMAP(aqm, AP_DOMAINS);
- list_for_each_entry(lstdev, &matrix_dev->mdev_list, node) {
- if (matrix_mdev == lstdev)
- continue;
- memset(apm, 0, sizeof(apm));
- memset(aqm, 0, sizeof(aqm));
- /*
- * We work on full longs, as we can only exclude the leftover
- * bits in non-inverse order. The leftover is all zeros.
- */
- if (!bitmap_and(apm, matrix_mdev->matrix.apm,
- lstdev->matrix.apm, AP_DEVICES))
- continue;
- if (!bitmap_and(aqm, matrix_mdev->matrix.aqm,
- lstdev->matrix.aqm, AP_DOMAINS))
- continue;
- return -EADDRINUSE;
- }
- return 0;
- }
- /**
- * assign_adapter_store
- *
- * @dev: the matrix device
- * @attr: the mediated matrix device's assign_adapter attribute
- * @buf: a buffer containing the AP adapter number (APID) to
- * be assigned
- * @count: the number of bytes in @buf
- *
- * Parses the APID from @buf and sets the corresponding bit in the mediated
- * matrix device's APM.
- *
- * Returns the number of bytes processed if the APID is valid; otherwise,
- * returns one of the following errors:
- *
- * 1. -EINVAL
- * The APID is not a valid number
- *
- * 2. -ENODEV
- * The APID exceeds the maximum value configured for the system
- *
- * 3. -EADDRNOTAVAIL
- * An APQN derived from the cross product of the APID being assigned
- * and the APQIs previously assigned is not bound to the vfio_ap device
- * driver; or, if no APQIs have yet been assigned, the APID is not
- * contained in an APQN bound to the vfio_ap device driver.
- *
- * 4. -EADDRINUSE
- * An APQN derived from the cross product of the APID being assigned
- * and the APQIs previously assigned is being used by another mediated
- * matrix device
- */
- static ssize_t assign_adapter_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- int ret;
- unsigned long apid;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- /* If the guest is running, disallow assignment of adapter */
- if (matrix_mdev->kvm)
- return -EBUSY;
- ret = kstrtoul(buf, 0, &apid);
- if (ret)
- return ret;
- if (apid > matrix_mdev->matrix.apm_max)
- return -ENODEV;
- /*
- * Set the bit in the AP mask (APM) corresponding to the AP adapter
- * number (APID). The bits in the mask, from most significant to least
- * significant bit, correspond to APIDs 0-255.
- */
- mutex_lock(&matrix_dev->lock);
- ret = vfio_ap_mdev_verify_queues_reserved_for_apid(matrix_mdev, apid);
- if (ret)
- goto done;
- set_bit_inv(apid, matrix_mdev->matrix.apm);
- ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev);
- if (ret)
- goto share_err;
- ret = count;
- goto done;
- share_err:
- clear_bit_inv(apid, matrix_mdev->matrix.apm);
- done:
- mutex_unlock(&matrix_dev->lock);
- return ret;
- }
- static DEVICE_ATTR_WO(assign_adapter);
- /**
- * unassign_adapter_store
- *
- * @dev: the matrix device
- * @attr: the mediated matrix device's unassign_adapter attribute
- * @buf: a buffer containing the adapter number (APID) to be unassigned
- * @count: the number of bytes in @buf
- *
- * Parses the APID from @buf and clears the corresponding bit in the mediated
- * matrix device's APM.
- *
- * Returns the number of bytes processed if the APID is valid; otherwise,
- * returns one of the following errors:
- * -EINVAL if the APID is not a number
- * -ENODEV if the APID it exceeds the maximum value configured for the
- * system
- */
- static ssize_t unassign_adapter_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- int ret;
- unsigned long apid;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- /* If the guest is running, disallow un-assignment of adapter */
- if (matrix_mdev->kvm)
- return -EBUSY;
- ret = kstrtoul(buf, 0, &apid);
- if (ret)
- return ret;
- if (apid > matrix_mdev->matrix.apm_max)
- return -ENODEV;
- mutex_lock(&matrix_dev->lock);
- clear_bit_inv((unsigned long)apid, matrix_mdev->matrix.apm);
- mutex_unlock(&matrix_dev->lock);
- return count;
- }
- static DEVICE_ATTR_WO(unassign_adapter);
- static int
- vfio_ap_mdev_verify_queues_reserved_for_apqi(struct ap_matrix_mdev *matrix_mdev,
- unsigned long apqi)
- {
- int ret;
- unsigned long apid;
- unsigned long nbits = matrix_mdev->matrix.apm_max + 1;
- if (find_first_bit_inv(matrix_mdev->matrix.apm, nbits) >= nbits)
- return vfio_ap_verify_queue_reserved(NULL, &apqi);
- for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, nbits) {
- ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
- if (ret)
- return ret;
- }
- return 0;
- }
- /**
- * assign_domain_store
- *
- * @dev: the matrix device
- * @attr: the mediated matrix device's assign_domain attribute
- * @buf: a buffer containing the AP queue index (APQI) of the domain to
- * be assigned
- * @count: the number of bytes in @buf
- *
- * Parses the APQI from @buf and sets the corresponding bit in the mediated
- * matrix device's AQM.
- *
- * Returns the number of bytes processed if the APQI is valid; otherwise returns
- * one of the following errors:
- *
- * 1. -EINVAL
- * The APQI is not a valid number
- *
- * 2. -ENODEV
- * The APQI exceeds the maximum value configured for the system
- *
- * 3. -EADDRNOTAVAIL
- * An APQN derived from the cross product of the APQI being assigned
- * and the APIDs previously assigned is not bound to the vfio_ap device
- * driver; or, if no APIDs have yet been assigned, the APQI is not
- * contained in an APQN bound to the vfio_ap device driver.
- *
- * 4. -EADDRINUSE
- * An APQN derived from the cross product of the APQI being assigned
- * and the APIDs previously assigned is being used by another mediated
- * matrix device
- */
- static ssize_t assign_domain_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- int ret;
- unsigned long apqi;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- unsigned long max_apqi = matrix_mdev->matrix.aqm_max;
- /* If the guest is running, disallow assignment of domain */
- if (matrix_mdev->kvm)
- return -EBUSY;
- ret = kstrtoul(buf, 0, &apqi);
- if (ret)
- return ret;
- if (apqi > max_apqi)
- return -ENODEV;
- mutex_lock(&matrix_dev->lock);
- ret = vfio_ap_mdev_verify_queues_reserved_for_apqi(matrix_mdev, apqi);
- if (ret)
- goto done;
- set_bit_inv(apqi, matrix_mdev->matrix.aqm);
- ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev);
- if (ret)
- goto share_err;
- ret = count;
- goto done;
- share_err:
- clear_bit_inv(apqi, matrix_mdev->matrix.aqm);
- done:
- mutex_unlock(&matrix_dev->lock);
- return ret;
- }
- static DEVICE_ATTR_WO(assign_domain);
- /**
- * unassign_domain_store
- *
- * @dev: the matrix device
- * @attr: the mediated matrix device's unassign_domain attribute
- * @buf: a buffer containing the AP queue index (APQI) of the domain to
- * be unassigned
- * @count: the number of bytes in @buf
- *
- * Parses the APQI from @buf and clears the corresponding bit in the
- * mediated matrix device's AQM.
- *
- * Returns the number of bytes processed if the APQI is valid; otherwise,
- * returns one of the following errors:
- * -EINVAL if the APQI is not a number
- * -ENODEV if the APQI exceeds the maximum value configured for the system
- */
- static ssize_t unassign_domain_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- int ret;
- unsigned long apqi;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- /* If the guest is running, disallow un-assignment of domain */
- if (matrix_mdev->kvm)
- return -EBUSY;
- ret = kstrtoul(buf, 0, &apqi);
- if (ret)
- return ret;
- if (apqi > matrix_mdev->matrix.aqm_max)
- return -ENODEV;
- mutex_lock(&matrix_dev->lock);
- clear_bit_inv((unsigned long)apqi, matrix_mdev->matrix.aqm);
- mutex_unlock(&matrix_dev->lock);
- return count;
- }
- static DEVICE_ATTR_WO(unassign_domain);
- /**
- * assign_control_domain_store
- *
- * @dev: the matrix device
- * @attr: the mediated matrix device's assign_control_domain attribute
- * @buf: a buffer containing the domain ID to be assigned
- * @count: the number of bytes in @buf
- *
- * Parses the domain ID from @buf and sets the corresponding bit in the mediated
- * matrix device's ADM.
- *
- * Returns the number of bytes processed if the domain ID is valid; otherwise,
- * returns one of the following errors:
- * -EINVAL if the ID is not a number
- * -ENODEV if the ID exceeds the maximum value configured for the system
- */
- static ssize_t assign_control_domain_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- int ret;
- unsigned long id;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- /* If the guest is running, disallow assignment of control domain */
- if (matrix_mdev->kvm)
- return -EBUSY;
- ret = kstrtoul(buf, 0, &id);
- if (ret)
- return ret;
- if (id > matrix_mdev->matrix.adm_max)
- return -ENODEV;
- /* Set the bit in the ADM (bitmask) corresponding to the AP control
- * domain number (id). The bits in the mask, from most significant to
- * least significant, correspond to IDs 0 up to the one less than the
- * number of control domains that can be assigned.
- */
- mutex_lock(&matrix_dev->lock);
- set_bit_inv(id, matrix_mdev->matrix.adm);
- mutex_unlock(&matrix_dev->lock);
- return count;
- }
- static DEVICE_ATTR_WO(assign_control_domain);
- /**
- * unassign_control_domain_store
- *
- * @dev: the matrix device
- * @attr: the mediated matrix device's unassign_control_domain attribute
- * @buf: a buffer containing the domain ID to be unassigned
- * @count: the number of bytes in @buf
- *
- * Parses the domain ID from @buf and clears the corresponding bit in the
- * mediated matrix device's ADM.
- *
- * Returns the number of bytes processed if the domain ID is valid; otherwise,
- * returns one of the following errors:
- * -EINVAL if the ID is not a number
- * -ENODEV if the ID exceeds the maximum value configured for the system
- */
- static ssize_t unassign_control_domain_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- int ret;
- unsigned long domid;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- unsigned long max_domid = matrix_mdev->matrix.adm_max;
- /* If the guest is running, disallow un-assignment of control domain */
- if (matrix_mdev->kvm)
- return -EBUSY;
- ret = kstrtoul(buf, 0, &domid);
- if (ret)
- return ret;
- if (domid > max_domid)
- return -ENODEV;
- mutex_lock(&matrix_dev->lock);
- clear_bit_inv(domid, matrix_mdev->matrix.adm);
- mutex_unlock(&matrix_dev->lock);
- return count;
- }
- static DEVICE_ATTR_WO(unassign_control_domain);
- static ssize_t control_domains_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- unsigned long id;
- int nchars = 0;
- int n;
- char *bufpos = buf;
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- unsigned long max_domid = matrix_mdev->matrix.adm_max;
- mutex_lock(&matrix_dev->lock);
- for_each_set_bit_inv(id, matrix_mdev->matrix.adm, max_domid + 1) {
- n = sprintf(bufpos, "%04lx\n", id);
- bufpos += n;
- nchars += n;
- }
- mutex_unlock(&matrix_dev->lock);
- return nchars;
- }
- static DEVICE_ATTR_RO(control_domains);
- static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
- char *buf)
- {
- struct mdev_device *mdev = mdev_from_dev(dev);
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- char *bufpos = buf;
- unsigned long apid;
- unsigned long apqi;
- unsigned long apid1;
- unsigned long apqi1;
- unsigned long napm_bits = matrix_mdev->matrix.apm_max + 1;
- unsigned long naqm_bits = matrix_mdev->matrix.aqm_max + 1;
- int nchars = 0;
- int n;
- apid1 = find_first_bit_inv(matrix_mdev->matrix.apm, napm_bits);
- apqi1 = find_first_bit_inv(matrix_mdev->matrix.aqm, naqm_bits);
- mutex_lock(&matrix_dev->lock);
- if ((apid1 < napm_bits) && (apqi1 < naqm_bits)) {
- for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {
- for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
- naqm_bits) {
- n = sprintf(bufpos, "%02lx.%04lx\n", apid,
- apqi);
- bufpos += n;
- nchars += n;
- }
- }
- } else if (apid1 < napm_bits) {
- for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {
- n = sprintf(bufpos, "%02lx.\n", apid);
- bufpos += n;
- nchars += n;
- }
- } else if (apqi1 < naqm_bits) {
- for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, naqm_bits) {
- n = sprintf(bufpos, ".%04lx\n", apqi);
- bufpos += n;
- nchars += n;
- }
- }
- mutex_unlock(&matrix_dev->lock);
- return nchars;
- }
- static DEVICE_ATTR_RO(matrix);
- static struct attribute *vfio_ap_mdev_attrs[] = {
- &dev_attr_assign_adapter.attr,
- &dev_attr_unassign_adapter.attr,
- &dev_attr_assign_domain.attr,
- &dev_attr_unassign_domain.attr,
- &dev_attr_assign_control_domain.attr,
- &dev_attr_unassign_control_domain.attr,
- &dev_attr_control_domains.attr,
- &dev_attr_matrix.attr,
- NULL,
- };
- static struct attribute_group vfio_ap_mdev_attr_group = {
- .attrs = vfio_ap_mdev_attrs
- };
- static const struct attribute_group *vfio_ap_mdev_attr_groups[] = {
- &vfio_ap_mdev_attr_group,
- NULL
- };
- /**
- * vfio_ap_mdev_set_kvm
- *
- * @matrix_mdev: a mediated matrix device
- * @kvm: reference to KVM instance
- *
- * Verifies no other mediated matrix device has @kvm and sets a reference to
- * it in @matrix_mdev->kvm.
- *
- * Return 0 if no other mediated matrix device has a reference to @kvm;
- * otherwise, returns an -EPERM.
- */
- static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev,
- struct kvm *kvm)
- {
- struct ap_matrix_mdev *m;
- mutex_lock(&matrix_dev->lock);
- list_for_each_entry(m, &matrix_dev->mdev_list, node) {
- if ((m != matrix_mdev) && (m->kvm == kvm)) {
- mutex_unlock(&matrix_dev->lock);
- return -EPERM;
- }
- }
- matrix_mdev->kvm = kvm;
- kvm_get_kvm(kvm);
- kvm->arch.crypto.pqap_hook = &matrix_mdev->pqap_hook;
- mutex_unlock(&matrix_dev->lock);
- return 0;
- }
- /*
- * vfio_ap_mdev_iommu_notifier: IOMMU notifier callback
- *
- * @nb: The notifier block
- * @action: Action to be taken
- * @data: data associated with the request
- *
- * For an UNMAP request, unpin the guest IOVA (the NIB guest address we
- * pinned before). Other requests are ignored.
- *
- */
- static int vfio_ap_mdev_iommu_notifier(struct notifier_block *nb,
- unsigned long action, void *data)
- {
- struct ap_matrix_mdev *matrix_mdev;
- matrix_mdev = container_of(nb, struct ap_matrix_mdev, iommu_notifier);
- if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
- struct vfio_iommu_type1_dma_unmap *unmap = data;
- unsigned long g_pfn = unmap->iova >> PAGE_SHIFT;
- vfio_unpin_pages(mdev_dev(matrix_mdev->mdev), &g_pfn, 1);
- return NOTIFY_OK;
- }
- return NOTIFY_DONE;
- }
- static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
- unsigned long action, void *data)
- {
- int ret;
- struct ap_matrix_mdev *matrix_mdev;
- if (action != VFIO_GROUP_NOTIFY_SET_KVM)
- return NOTIFY_OK;
- matrix_mdev = container_of(nb, struct ap_matrix_mdev, group_notifier);
- if (!data) {
- matrix_mdev->kvm = NULL;
- return NOTIFY_OK;
- }
- ret = vfio_ap_mdev_set_kvm(matrix_mdev, data);
- if (ret)
- return NOTIFY_DONE;
- /* If there is no CRYCB pointer, then we can't copy the masks */
- if (!matrix_mdev->kvm->arch.crypto.crycbd)
- return NOTIFY_DONE;
- kvm_arch_crypto_set_masks(matrix_mdev->kvm, matrix_mdev->matrix.apm,
- matrix_mdev->matrix.aqm,
- matrix_mdev->matrix.adm);
- return NOTIFY_OK;
- }
- static struct vfio_ap_queue *vfio_ap_find_queue(int apqn)
- {
- struct device *dev;
- struct vfio_ap_queue *q = NULL;
- dev = driver_find_device(&matrix_dev->vfio_ap_drv->driver, NULL,
- &apqn, match_apqn);
- if (dev) {
- q = dev_get_drvdata(dev);
- put_device(dev);
- }
- return q;
- }
- int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q,
- unsigned int retry)
- {
- struct ap_queue_status status;
- int ret;
- int retry2 = 2;
- if (!q)
- return 0;
- retry_zapq:
- status = ap_zapq(q->apqn);
- switch (status.response_code) {
- case AP_RESPONSE_NORMAL:
- ret = 0;
- break;
- case AP_RESPONSE_RESET_IN_PROGRESS:
- if (retry--) {
- msleep(20);
- goto retry_zapq;
- }
- ret = -EBUSY;
- break;
- case AP_RESPONSE_Q_NOT_AVAIL:
- case AP_RESPONSE_DECONFIGURED:
- case AP_RESPONSE_CHECKSTOPPED:
- WARN_ON_ONCE(status.irq_enabled);
- ret = -EBUSY;
- goto free_resources;
- default:
- /* things are really broken, give up */
- WARN(true, "PQAP/ZAPQ completed with invalid rc (%x)\n",
- status.response_code);
- return -EIO;
- }
- /* wait for the reset to take effect */
- while (retry2--) {
- if (status.queue_empty && !status.irq_enabled)
- break;
- msleep(20);
- status = ap_tapq(q->apqn, NULL);
- }
- WARN_ON_ONCE(retry2 <= 0);
- free_resources:
- vfio_ap_free_aqic_resources(q);
- return ret;
- }
- static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
- {
- int ret;
- int rc = 0;
- unsigned long apid, apqi;
- struct vfio_ap_queue *q;
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- for_each_set_bit_inv(apid, matrix_mdev->matrix.apm,
- matrix_mdev->matrix.apm_max + 1) {
- for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
- matrix_mdev->matrix.aqm_max + 1) {
- q = vfio_ap_find_queue(AP_MKQID(apid, apqi));
- ret = vfio_ap_mdev_reset_queue(q, 1);
- /*
- * Regardless whether a queue turns out to be busy, or
- * is not operational, we need to continue resetting
- * the remaining queues.
- */
- if (ret)
- rc = ret;
- }
- }
- return rc;
- }
- static int vfio_ap_mdev_open(struct mdev_device *mdev)
- {
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- unsigned long events;
- int ret;
- if (!try_module_get(THIS_MODULE))
- return -ENODEV;
- matrix_mdev->group_notifier.notifier_call = vfio_ap_mdev_group_notifier;
- events = VFIO_GROUP_NOTIFY_SET_KVM;
- ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
- &events, &matrix_mdev->group_notifier);
- if (ret) {
- module_put(THIS_MODULE);
- return ret;
- }
- matrix_mdev->iommu_notifier.notifier_call = vfio_ap_mdev_iommu_notifier;
- events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
- ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
- &events, &matrix_mdev->iommu_notifier);
- if (!ret)
- return ret;
- vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
- &matrix_mdev->group_notifier);
- module_put(THIS_MODULE);
- return ret;
- }
- static void vfio_ap_mdev_release(struct mdev_device *mdev)
- {
- struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
- mutex_lock(&matrix_dev->lock);
- if (matrix_mdev->kvm) {
- kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
- matrix_mdev->kvm->arch.crypto.pqap_hook = NULL;
- vfio_ap_mdev_reset_queues(mdev);
- kvm_put_kvm(matrix_mdev->kvm);
- matrix_mdev->kvm = NULL;
- }
- mutex_unlock(&matrix_dev->lock);
- vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
- &matrix_mdev->iommu_notifier);
- vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
- &matrix_mdev->group_notifier);
- module_put(THIS_MODULE);
- }
- static int vfio_ap_mdev_get_device_info(unsigned long arg)
- {
- unsigned long minsz;
- struct vfio_device_info info;
- minsz = offsetofend(struct vfio_device_info, num_irqs);
- if (copy_from_user(&info, (void __user *)arg, minsz))
- return -EFAULT;
- if (info.argsz < minsz)
- return -EINVAL;
- info.flags = VFIO_DEVICE_FLAGS_AP | VFIO_DEVICE_FLAGS_RESET;
- info.num_regions = 0;
- info.num_irqs = 0;
- return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
- }
- static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
- unsigned int cmd, unsigned long arg)
- {
- int ret;
- mutex_lock(&matrix_dev->lock);
- switch (cmd) {
- case VFIO_DEVICE_GET_INFO:
- ret = vfio_ap_mdev_get_device_info(arg);
- break;
- case VFIO_DEVICE_RESET:
- ret = vfio_ap_mdev_reset_queues(mdev);
- break;
- default:
- ret = -EOPNOTSUPP;
- break;
- }
- mutex_unlock(&matrix_dev->lock);
- return ret;
- }
- static const struct mdev_parent_ops vfio_ap_matrix_ops = {
- .owner = THIS_MODULE,
- .supported_type_groups = vfio_ap_mdev_type_groups,
- .mdev_attr_groups = vfio_ap_mdev_attr_groups,
- .create = vfio_ap_mdev_create,
- .remove = vfio_ap_mdev_remove,
- .open = vfio_ap_mdev_open,
- .release = vfio_ap_mdev_release,
- .ioctl = vfio_ap_mdev_ioctl,
- };
- int vfio_ap_mdev_register(void)
- {
- atomic_set(&matrix_dev->available_instances, MAX_ZDEV_ENTRIES_EXT);
- return mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_ops);
- }
- void vfio_ap_mdev_unregister(void)
- {
- mdev_unregister_device(&matrix_dev->device);
- }
|