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mirror_ubuntu-kernels/drivers/s390/crypto/vfio_ap_ops.c

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// 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 <linux/uuid.h>
#include <asm/kvm.h>
#include <asm/zcrypt.h>
#include "vfio_ap_private.h"
#include "vfio_ap_debug.h"
#define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough"
#define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device"
#define AP_QUEUE_ASSIGNED "assigned"
#define AP_QUEUE_UNASSIGNED "unassigned"
#define AP_QUEUE_IN_USE "in use"
#define AP_RESET_INTERVAL 20 /* Reset sleep interval (20ms) */
static int vfio_ap_mdev_reset_queues(struct ap_matrix_mdev *matrix_mdev);
static int vfio_ap_mdev_reset_qlist(struct list_head *qlist);
static struct vfio_ap_queue *vfio_ap_find_queue(int apqn);
static const struct vfio_device_ops vfio_ap_matrix_dev_ops;
static void vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q);
/**
* get_update_locks_for_kvm: Acquire the locks required to dynamically update a
* KVM guest's APCB in the proper order.
*
* @kvm: a pointer to a struct kvm object containing the KVM guest's APCB.
*
* The proper locking order is:
* 1. matrix_dev->guests_lock: required to use the KVM pointer to update a KVM
* guest's APCB.
* 2. kvm->lock: required to update a guest's APCB
* 3. matrix_dev->mdevs_lock: required to access data stored in a matrix_mdev
*
* Note: If @kvm is NULL, the KVM lock will not be taken.
*/
static inline void get_update_locks_for_kvm(struct kvm *kvm)
{
mutex_lock(&matrix_dev->guests_lock);
if (kvm)
mutex_lock(&kvm->lock);
mutex_lock(&matrix_dev->mdevs_lock);
}
/**
* release_update_locks_for_kvm: Release the locks used to dynamically update a
* KVM guest's APCB in the proper order.
*
* @kvm: a pointer to a struct kvm object containing the KVM guest's APCB.
*
* The proper unlocking order is:
* 1. matrix_dev->mdevs_lock
* 2. kvm->lock
* 3. matrix_dev->guests_lock
*
* Note: If @kvm is NULL, the KVM lock will not be released.
*/
static inline void release_update_locks_for_kvm(struct kvm *kvm)
{
mutex_unlock(&matrix_dev->mdevs_lock);
if (kvm)
mutex_unlock(&kvm->lock);
mutex_unlock(&matrix_dev->guests_lock);
}
/**
* get_update_locks_for_mdev: Acquire the locks required to dynamically update a
* KVM guest's APCB in the proper order.
*
* @matrix_mdev: a pointer to a struct ap_matrix_mdev object containing the AP
* configuration data to use to update a KVM guest's APCB.
*
* The proper locking order is:
* 1. matrix_dev->guests_lock: required to use the KVM pointer to update a KVM
* guest's APCB.
* 2. matrix_mdev->kvm->lock: required to update a guest's APCB
* 3. matrix_dev->mdevs_lock: required to access data stored in a matrix_mdev
*
* Note: If @matrix_mdev is NULL or is not attached to a KVM guest, the KVM
* lock will not be taken.
*/
static inline void get_update_locks_for_mdev(struct ap_matrix_mdev *matrix_mdev)
{
mutex_lock(&matrix_dev->guests_lock);
if (matrix_mdev && matrix_mdev->kvm)
mutex_lock(&matrix_mdev->kvm->lock);
mutex_lock(&matrix_dev->mdevs_lock);
}
/**
* release_update_locks_for_mdev: Release the locks used to dynamically update a
* KVM guest's APCB in the proper order.
*
* @matrix_mdev: a pointer to a struct ap_matrix_mdev object containing the AP
* configuration data to use to update a KVM guest's APCB.
*
* The proper unlocking order is:
* 1. matrix_dev->mdevs_lock
* 2. matrix_mdev->kvm->lock
* 3. matrix_dev->guests_lock
*
* Note: If @matrix_mdev is NULL or is not attached to a KVM guest, the KVM
* lock will not be released.
*/
static inline void release_update_locks_for_mdev(struct ap_matrix_mdev *matrix_mdev)
{
mutex_unlock(&matrix_dev->mdevs_lock);
if (matrix_mdev && matrix_mdev->kvm)
mutex_unlock(&matrix_mdev->kvm->lock);
mutex_unlock(&matrix_dev->guests_lock);
}
/**
* get_update_locks_by_apqn: Find the mdev to which an APQN is assigned and
* acquire the locks required to update the APCB of
* the KVM guest to which the mdev is attached.
*
* @apqn: the APQN of a queue device.
*
* The proper locking order is:
* 1. matrix_dev->guests_lock: required to use the KVM pointer to update a KVM
* guest's APCB.
* 2. matrix_mdev->kvm->lock: required to update a guest's APCB
* 3. matrix_dev->mdevs_lock: required to access data stored in a matrix_mdev
*
* Note: If @apqn is not assigned to a matrix_mdev, the matrix_mdev->kvm->lock
* will not be taken.
*
* Return: the ap_matrix_mdev object to which @apqn is assigned or NULL if @apqn
* is not assigned to an ap_matrix_mdev.
*/
static struct ap_matrix_mdev *get_update_locks_by_apqn(int apqn)
{
struct ap_matrix_mdev *matrix_mdev;
mutex_lock(&matrix_dev->guests_lock);
list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
if (test_bit_inv(AP_QID_CARD(apqn), matrix_mdev->matrix.apm) &&
test_bit_inv(AP_QID_QUEUE(apqn), matrix_mdev->matrix.aqm)) {
if (matrix_mdev->kvm)
mutex_lock(&matrix_mdev->kvm->lock);
mutex_lock(&matrix_dev->mdevs_lock);
return matrix_mdev;
}
}
mutex_lock(&matrix_dev->mdevs_lock);
return NULL;
}
/**
* get_update_locks_for_queue: get the locks required to update the APCB of the
* KVM guest to which the matrix mdev linked to a
* vfio_ap_queue object is attached.
*
* @q: a pointer to a vfio_ap_queue object.
*
* The proper locking order is:
* 1. q->matrix_dev->guests_lock: required to use the KVM pointer to update a
* KVM guest's APCB.
* 2. q->matrix_mdev->kvm->lock: required to update a guest's APCB
* 3. matrix_dev->mdevs_lock: required to access data stored in matrix_mdev
*
* Note: if @queue is not linked to an ap_matrix_mdev object, the KVM lock
* will not be taken.
*/
static inline void get_update_locks_for_queue(struct vfio_ap_queue *q)
{
mutex_lock(&matrix_dev->guests_lock);
if (q->matrix_mdev && q->matrix_mdev->kvm)
mutex_lock(&q->matrix_mdev->kvm->lock);
mutex_lock(&matrix_dev->mdevs_lock);
}
/**
* vfio_ap_mdev_get_queue - retrieve a queue with a specific APQN from a
* hash table of queues assigned to a matrix mdev
* @matrix_mdev: the matrix mdev
* @apqn: The APQN of a queue device
*
* Return: the pointer to the vfio_ap_queue struct representing the queue or
* NULL if the queue is not assigned to @matrix_mdev
*/
static struct vfio_ap_queue *vfio_ap_mdev_get_queue(
struct ap_matrix_mdev *matrix_mdev,
int apqn)
{
struct vfio_ap_queue *q;
hash_for_each_possible(matrix_mdev->qtable.queues, q, mdev_qnode,
apqn) {
if (q && q->apqn == apqn)
return q;
}
return NULL;
}
/**
* vfio_ap_wait_for_irqclear - clears the IR bit or gives up after 5 tries
* @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 - free vfio_ap_queue resources
* @q: The vfio_ap_queue
*
* Unregisters the ISC in the GIB when the saved ISC not invalid.
* Unpins the guest's page holding the NIB when it exists.
* Resets the saved_iova 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_iova && !WARN_ON(!q->matrix_mdev)) {
vfio_unpin_pages(&q->matrix_mdev->vdev, q->saved_iova, 1);
q->saved_iova = 0;
}
}
/**
* vfio_ap_irq_disable - disables and clears an ap_queue interrupt
* @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.
*
* Return: &struct ap_queue_status
*/
static struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q)
{
union ap_qirq_ctrl aqic_gisa = { .value = 0 };
struct ap_queue_status status;
int retries = 5;
do {
status = ap_aqic(q->apqn, aqic_gisa, 0);
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);
return status;
}
/**
* vfio_ap_validate_nib - validate a notification indicator byte (nib) address.
*
* @vcpu: the object representing the vcpu executing the PQAP(AQIC) instruction.
* @nib: the location for storing the nib address.
*
* When the PQAP(AQIC) instruction is executed, general register 2 contains the
* address of the notification indicator byte (nib) used for IRQ notification.
* This function parses and validates the nib from gr2.
*
* Return: returns zero if the nib address is a valid; otherwise, returns
* -EINVAL.
*/
static int vfio_ap_validate_nib(struct kvm_vcpu *vcpu, dma_addr_t *nib)
{
*nib = vcpu->run->s.regs.gprs[2];
if (!*nib)
return -EINVAL;
if (kvm_is_error_hva(gfn_to_hva(vcpu->kvm, *nib >> PAGE_SHIFT)))
return -EINVAL;
return 0;
}
static int ensure_nib_shared(unsigned long addr, struct gmap *gmap)
{
int ret;
/*
* The nib has to be located in shared storage since guest and
* host access it. vfio_pin_pages() will do a pin shared and
* if that fails (possibly because it's not a shared page) it
* calls export. We try to do a second pin shared here so that
* the UV gives us an error code if we try to pin a non-shared
* page.
*
* If the page is already pinned shared the UV will return a success.
*/
ret = uv_pin_shared(addr);
if (ret) {
/* vfio_pin_pages() likely exported the page so let's re-import */
gmap_convert_to_secure(gmap, addr);
}
return ret;
}
/**
* vfio_ap_irq_enable - Enable Interruption for a APQN
*
* @q: the vfio_ap_queue holding AQIC parameters
* @isc: the guest ISC to register with the GIB interface
* @vcpu: the vcpu object containing the registers specifying the parameters
* passed to the PQAP(AQIC) instruction.
*
* 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
*
* status.response_code may be set to AP_RESPONSE_INVALID_ADDRESS in case the
* vfio_pin_pages or kvm_s390_gisc_register failed.
*
* Otherwise return the ap_queue_status returned by the ap_aqic(),
* all retry handling will be done by the guest.
*
* Return: &struct ap_queue_status
*/
static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
int isc,
struct kvm_vcpu *vcpu)
{
union ap_qirq_ctrl aqic_gisa = { .value = 0 };
struct ap_queue_status status = {};
struct kvm_s390_gisa *gisa;
struct page *h_page;
int nisc;
struct kvm *kvm;
phys_addr_t h_nib;
dma_addr_t nib;
int ret;
/* Verify that the notification indicator byte address is valid */
if (vfio_ap_validate_nib(vcpu, &nib)) {
VFIO_AP_DBF_WARN("%s: invalid NIB address: nib=%pad, apqn=%#04x\n",
__func__, &nib, q->apqn);
status.response_code = AP_RESPONSE_INVALID_ADDRESS;
return status;
}
ret = vfio_pin_pages(&q->matrix_mdev->vdev, nib, 1,
IOMMU_READ | IOMMU_WRITE, &h_page);
switch (ret) {
case 1:
break;
default:
VFIO_AP_DBF_WARN("%s: vfio_pin_pages failed: rc=%d,"
"nib=%pad, apqn=%#04x\n",
__func__, ret, &nib, q->apqn);
status.response_code = AP_RESPONSE_INVALID_ADDRESS;
return status;
}
kvm = q->matrix_mdev->kvm;
gisa = kvm->arch.gisa_int.origin;
h_nib = page_to_phys(h_page) | (nib & ~PAGE_MASK);
aqic_gisa.gisc = isc;
/* NIB in non-shared storage is a rc 6 for PV guests */
if (kvm_s390_pv_cpu_is_protected(vcpu) &&
ensure_nib_shared(h_nib & PAGE_MASK, kvm->arch.gmap)) {
vfio_unpin_pages(&q->matrix_mdev->vdev, nib, 1);
status.response_code = AP_RESPONSE_INVALID_ADDRESS;
return status;
}
nisc = kvm_s390_gisc_register(kvm, isc);
if (nisc < 0) {
VFIO_AP_DBF_WARN("%s: gisc registration failed: nisc=%d, isc=%d, apqn=%#04x\n",
__func__, nisc, isc, q->apqn);
vfio_unpin_pages(&q->matrix_mdev->vdev, nib, 1);
status.response_code = AP_RESPONSE_INVALID_ADDRESS;
return status;
}
aqic_gisa.isc = nisc;
aqic_gisa.ir = 1;
aqic_gisa.gisa = virt_to_phys(gisa) >> 4;
status = ap_aqic(q->apqn, aqic_gisa, 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_iova = nib;
q->saved_isc = isc;
break;
case AP_RESPONSE_OTHERWISE_CHANGED:
/* We could not modify IRQ settings: clear new configuration */
ret = kvm_s390_gisc_unregister(kvm, isc);
if (ret)
VFIO_AP_DBF_WARN("%s: kvm_s390_gisc_unregister: rc=%d isc=%d, apqn=%#04x\n",
__func__, ret, isc, q->apqn);
vfio_unpin_pages(&q->matrix_mdev->vdev, nib, 1);
break;
default:
pr_warn("%s: apqn %04x: response: %02x\n", __func__, q->apqn,
status.response_code);
vfio_ap_irq_disable(q);
break;
}
if (status.response_code != AP_RESPONSE_NORMAL) {
VFIO_AP_DBF_WARN("%s: PQAP(AQIC) failed with status=%#02x: "
"zone=%#x, ir=%#x, gisc=%#x, f=%#x,"
"gisa=%#x, isc=%#x, apqn=%#04x\n",
__func__, status.response_code,
aqic_gisa.zone, aqic_gisa.ir, aqic_gisa.gisc,
aqic_gisa.gf, aqic_gisa.gisa, aqic_gisa.isc,
q->apqn);
}
return status;
}
/**
* vfio_ap_le_guid_to_be_uuid - convert a little endian guid array into an array
* of big endian elements that can be passed by
* value to an s390dbf sprintf event function to
* format a UUID string.
*
* @guid: the object containing the little endian guid
* @uuid: a six-element array of long values that can be passed by value as
* arguments for a formatting string specifying a UUID.
*
* The S390 Debug Feature (s390dbf) allows the use of "%s" in the sprintf
* event functions if the memory for the passed string is available as long as
* the debug feature exists. Since a mediated device can be removed at any
* time, it's name can not be used because %s passes the reference to the string
* in memory and the reference will go stale once the device is removed .
*
* The s390dbf string formatting function allows a maximum of 9 arguments for a
* message to be displayed in the 'sprintf' view. In order to use the bytes
* comprising the mediated device's UUID to display the mediated device name,
* they will have to be converted into an array whose elements can be passed by
* value to sprintf. For example:
*
* guid array: { 83, 78, 17, 62, bb, f1, f0, 47, 91, 4d, 32, a2, 2e, 3a, 88, 04 }
* mdev name: 62177883-f1bb-47f0-914d-32a22e3a8804
* array returned: { 62177883, f1bb, 47f0, 914d, 32a2, 2e3a8804 }
* formatting string: "%08lx-%04lx-%04lx-%04lx-%02lx%04lx"
*/
static void vfio_ap_le_guid_to_be_uuid(guid_t *guid, unsigned long *uuid)
{
/*
* The input guid is ordered in little endian, so it needs to be
* reordered for displaying a UUID as a string. This specifies the
* guid indices in proper order.
*/
uuid[0] = le32_to_cpup((__le32 *)guid);
uuid[1] = le16_to_cpup((__le16 *)&guid->b[4]);
uuid[2] = le16_to_cpup((__le16 *)&guid->b[6]);
uuid[3] = *((__u16 *)&guid->b[8]);
uuid[4] = *((__u16 *)&guid->b[10]);
uuid[5] = *((__u32 *)&guid->b[12]);
}
/**
* 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 success
* 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;
unsigned long uuid[6];
struct vfio_ap_queue *q;
struct ap_queue_status qstatus = {
.response_code = AP_RESPONSE_Q_NOT_AVAIL, };
struct ap_matrix_mdev *matrix_mdev;
apqn = vcpu->run->s.regs.gprs[0] & 0xffff;
/* If we do not use the AIV facility just go to userland */
if (!(vcpu->arch.sie_block->eca & ECA_AIV)) {
VFIO_AP_DBF_WARN("%s: AIV facility not installed: apqn=0x%04x, eca=0x%04x\n",
__func__, apqn, vcpu->arch.sie_block->eca);
return -EOPNOTSUPP;
}
mutex_lock(&matrix_dev->mdevs_lock);
if (!vcpu->kvm->arch.crypto.pqap_hook) {
VFIO_AP_DBF_WARN("%s: PQAP(AQIC) hook not registered with the vfio_ap driver: apqn=0x%04x\n",
__func__, apqn);
goto out_unlock;
}
matrix_mdev = container_of(vcpu->kvm->arch.crypto.pqap_hook,
struct ap_matrix_mdev, pqap_hook);
/* If the there is no guest using the mdev, there is nothing to do */
if (!matrix_mdev->kvm) {
vfio_ap_le_guid_to_be_uuid(&matrix_mdev->mdev->uuid, uuid);
VFIO_AP_DBF_WARN("%s: mdev %08lx-%04lx-%04lx-%04lx-%04lx%08lx not in use: apqn=0x%04x\n",
__func__, uuid[0], uuid[1], uuid[2],
uuid[3], uuid[4], uuid[5], apqn);
goto out_unlock;
}
q = vfio_ap_mdev_get_queue(matrix_mdev, apqn);
if (!q) {
VFIO_AP_DBF_WARN("%s: Queue %02x.%04x not bound to the vfio_ap driver\n",
__func__, AP_QID_CARD(apqn),
AP_QID_QUEUE(apqn));
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);
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->mdevs_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 void vfio_ap_mdev_update_guest_apcb(struct ap_matrix_mdev *matrix_mdev)
{
if (matrix_mdev->kvm)
kvm_arch_crypto_set_masks(matrix_mdev->kvm,
matrix_mdev->shadow_apcb.apm,
matrix_mdev->shadow_apcb.aqm,
matrix_mdev->shadow_apcb.adm);
}
static bool vfio_ap_mdev_filter_cdoms(struct ap_matrix_mdev *matrix_mdev)
{
DECLARE_BITMAP(prev_shadow_adm, AP_DOMAINS);
bitmap_copy(prev_shadow_adm, matrix_mdev->shadow_apcb.adm, AP_DOMAINS);
bitmap_and(matrix_mdev->shadow_apcb.adm, matrix_mdev->matrix.adm,
(unsigned long *)matrix_dev->info.adm, AP_DOMAINS);
return !bitmap_equal(prev_shadow_adm, matrix_mdev->shadow_apcb.adm,
AP_DOMAINS);
}
/*
* vfio_ap_mdev_filter_matrix - filter the APQNs assigned to the matrix mdev
* to ensure no queue devices are passed through to
* the guest that are not bound to the vfio_ap
* device driver.
*
* @matrix_mdev: the matrix mdev whose matrix is to be filtered.
* @apm_filtered: a 256-bit bitmap for storing the APIDs filtered from the
* guest's AP configuration that are still in the host's AP
* configuration.
*
* Note: If an APQN referencing a queue device that is not bound to the vfio_ap
* driver, its APID will be filtered from the guest's APCB. The matrix
* structure precludes filtering an individual APQN, so its APID will be
* filtered. Consequently, all queues associated with the adapter that
* are in the host's AP configuration must be reset. If queues are
* subsequently made available again to the guest, they should re-appear
* in a reset state
*
* Return: a boolean value indicating whether the KVM guest's APCB was changed
* by the filtering or not.
*/
static bool vfio_ap_mdev_filter_matrix(struct ap_matrix_mdev *matrix_mdev,
unsigned long *apm_filtered)
{
unsigned long apid, apqi, apqn;
DECLARE_BITMAP(prev_shadow_apm, AP_DEVICES);
DECLARE_BITMAP(prev_shadow_aqm, AP_DOMAINS);
struct vfio_ap_queue *q;
bitmap_copy(prev_shadow_apm, matrix_mdev->shadow_apcb.apm, AP_DEVICES);
bitmap_copy(prev_shadow_aqm, matrix_mdev->shadow_apcb.aqm, AP_DOMAINS);
vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb);
bitmap_clear(apm_filtered, 0, AP_DEVICES);
/*
* Copy the adapters, domains and control domains to the shadow_apcb
* from the matrix mdev, but only those that are assigned to the host's
* AP configuration.
*/
bitmap_and(matrix_mdev->shadow_apcb.apm, matrix_mdev->matrix.apm,
(unsigned long *)matrix_dev->info.apm, AP_DEVICES);
bitmap_and(matrix_mdev->shadow_apcb.aqm, matrix_mdev->matrix.aqm,
(unsigned long *)matrix_dev->info.aqm, AP_DOMAINS);
for_each_set_bit_inv(apid, matrix_mdev->shadow_apcb.apm, AP_DEVICES) {
for_each_set_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm,
AP_DOMAINS) {
/*
* If the APQN is not bound to the vfio_ap device
* driver, then we can't assign it to the guest's
* AP configuration. The AP architecture won't
* allow filtering of a single APQN, so let's filter
* the APID since an adapter represents a physical
* hardware device.
*/
apqn = AP_MKQID(apid, apqi);
q = vfio_ap_mdev_get_queue(matrix_mdev, apqn);
if (!q || q->reset_status.response_code) {
clear_bit_inv(apid, matrix_mdev->shadow_apcb.apm);
/*
* If the adapter was previously plugged into
* the guest, let's let the caller know that
* the APID was filtered.
*/
if (test_bit_inv(apid, prev_shadow_apm))
set_bit_inv(apid, apm_filtered);
break;
}
}
}
return !bitmap_equal(prev_shadow_apm, matrix_mdev->shadow_apcb.apm,
AP_DEVICES) ||
!bitmap_equal(prev_shadow_aqm, matrix_mdev->shadow_apcb.aqm,
AP_DOMAINS);
}
static int vfio_ap_mdev_init_dev(struct vfio_device *vdev)
{
struct ap_matrix_mdev *matrix_mdev =
container_of(vdev, struct ap_matrix_mdev, vdev);
matrix_mdev->mdev = to_mdev_device(vdev->dev);
vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
matrix_mdev->pqap_hook = handle_pqap;
vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb);
hash_init(matrix_mdev->qtable.queues);
return 0;
}
static int vfio_ap_mdev_probe(struct mdev_device *mdev)
{
struct ap_matrix_mdev *matrix_mdev;
int ret;
matrix_mdev = vfio_alloc_device(ap_matrix_mdev, vdev, &mdev->dev,
&vfio_ap_matrix_dev_ops);
if (IS_ERR(matrix_mdev))
return PTR_ERR(matrix_mdev);
ret = vfio_register_emulated_iommu_dev(&matrix_mdev->vdev);
if (ret)
goto err_put_vdev;
matrix_mdev->req_trigger = NULL;
dev_set_drvdata(&mdev->dev, matrix_mdev);
mutex_lock(&matrix_dev->mdevs_lock);
list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
mutex_unlock(&matrix_dev->mdevs_lock);
return 0;
err_put_vdev:
vfio_put_device(&matrix_mdev->vdev);
return ret;
}
static void vfio_ap_mdev_link_queue(struct ap_matrix_mdev *matrix_mdev,
struct vfio_ap_queue *q)
{
if (q) {
q->matrix_mdev = matrix_mdev;
hash_add(matrix_mdev->qtable.queues, &q->mdev_qnode, q->apqn);
}
}
static void vfio_ap_mdev_link_apqn(struct ap_matrix_mdev *matrix_mdev, int apqn)
{
struct vfio_ap_queue *q;
q = vfio_ap_find_queue(apqn);
vfio_ap_mdev_link_queue(matrix_mdev, q);
}
static void vfio_ap_unlink_queue_fr_mdev(struct vfio_ap_queue *q)
{
hash_del(&q->mdev_qnode);
}
static void vfio_ap_unlink_mdev_fr_queue(struct vfio_ap_queue *q)
{
q->matrix_mdev = NULL;
}
static void vfio_ap_mdev_unlink_fr_queues(struct ap_matrix_mdev *matrix_mdev)
{
struct vfio_ap_queue *q;
unsigned long apid, apqi;
for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, AP_DEVICES) {
for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
AP_DOMAINS) {
q = vfio_ap_mdev_get_queue(matrix_mdev,
AP_MKQID(apid, apqi));
if (q)
q->matrix_mdev = NULL;
}
}
}
static void vfio_ap_mdev_remove(struct mdev_device *mdev)
{
struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(&mdev->dev);
vfio_unregister_group_dev(&matrix_mdev->vdev);
mutex_lock(&matrix_dev->guests_lock);
mutex_lock(&matrix_dev->mdevs_lock);
vfio_ap_mdev_reset_queues(matrix_mdev);
vfio_ap_mdev_unlink_fr_queues(matrix_mdev);
list_del(&matrix_mdev->node);
mutex_unlock(&matrix_dev->mdevs_lock);
mutex_unlock(&matrix_dev->guests_lock);
vfio_put_device(&matrix_mdev->vdev);
}
#define MDEV_SHARING_ERR "Userspace may not re-assign queue %02lx.%04lx " \
"already assigned to %s"
static void vfio_ap_mdev_log_sharing_err(struct ap_matrix_mdev *matrix_mdev,
unsigned long *apm,
unsigned long *aqm)
{
unsigned long apid, apqi;
const struct device *dev = mdev_dev(matrix_mdev->mdev);
const char *mdev_name = dev_name(dev);
for_each_set_bit_inv(apid, apm, AP_DEVICES)
for_each_set_bit_inv(apqi, aqm, AP_DOMAINS)
dev_warn(dev, MDEV_SHARING_ERR, apid, apqi, mdev_name);
}
/**
* vfio_ap_mdev_verify_no_sharing - verify APQNs are not shared by matrix mdevs
*
* @mdev_apm: mask indicating the APIDs of the APQNs to be verified
* @mdev_aqm: mask indicating the APQIs of the APQNs to be verified
*
* Verifies that each APQN derived from the Cartesian product of a bitmap of
* AP adapter IDs and AP queue indexes is not configured for any matrix
* mediated device. AP queue sharing is not allowed.
*
* Return: 0 if the APQNs are not shared; otherwise return -EADDRINUSE.
*/
static int vfio_ap_mdev_verify_no_sharing(unsigned long *mdev_apm,
unsigned long *mdev_aqm)
{
struct ap_matrix_mdev *matrix_mdev;
DECLARE_BITMAP(apm, AP_DEVICES);
DECLARE_BITMAP(aqm, AP_DOMAINS);
list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
/*
* If the input apm and aqm are fields of the matrix_mdev
* object, then move on to the next matrix_mdev.
*/
if (mdev_apm == matrix_mdev->matrix.apm &&
mdev_aqm == matrix_mdev->matrix.aqm)
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, mdev_apm, matrix_mdev->matrix.apm,
AP_DEVICES))
continue;
if (!bitmap_and(aqm, mdev_aqm, matrix_mdev->matrix.aqm,
AP_DOMAINS))
continue;
vfio_ap_mdev_log_sharing_err(matrix_mdev, apm, aqm);
return -EADDRINUSE;
}
return 0;
}
/**
* vfio_ap_mdev_validate_masks - verify that the APQNs assigned to the mdev are
* not reserved for the default zcrypt driver and
* are not assigned to another mdev.
*
* @matrix_mdev: the mdev to which the APQNs being validated are assigned.
*
* Return: One of the following values:
* o the error returned from the ap_apqn_in_matrix_owned_by_def_drv() function,
* most likely -EBUSY indicating the ap_perms_mutex lock is already held.
* o EADDRNOTAVAIL if an APQN assigned to @matrix_mdev is reserved for the
* zcrypt default driver.
* o EADDRINUSE if an APQN assigned to @matrix_mdev is assigned to another mdev
* o A zero indicating validation succeeded.
*/
static int vfio_ap_mdev_validate_masks(struct ap_matrix_mdev *matrix_mdev)
{
if (ap_apqn_in_matrix_owned_by_def_drv(matrix_mdev->matrix.apm,
matrix_mdev->matrix.aqm))
return -EADDRNOTAVAIL;
return vfio_ap_mdev_verify_no_sharing(matrix_mdev->matrix.apm,
matrix_mdev->matrix.aqm);
}
static void vfio_ap_mdev_link_adapter(struct ap_matrix_mdev *matrix_mdev,
unsigned long apid)
{
unsigned long apqi;
for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, AP_DOMAINS)
vfio_ap_mdev_link_apqn(matrix_mdev,
AP_MKQID(apid, apqi));
}
static void collect_queues_to_reset(struct ap_matrix_mdev *matrix_mdev,
unsigned long apid,
struct list_head *qlist)
{
struct vfio_ap_queue *q;
unsigned long apqi;
for_each_set_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm, AP_DOMAINS) {
q = vfio_ap_mdev_get_queue(matrix_mdev, AP_MKQID(apid, apqi));
if (q)
list_add_tail(&q->reset_qnode, qlist);
}
}
static void reset_queues_for_apid(struct ap_matrix_mdev *matrix_mdev,
unsigned long apid)
{
struct list_head qlist;
INIT_LIST_HEAD(&qlist);
collect_queues_to_reset(matrix_mdev, apid, &qlist);
vfio_ap_mdev_reset_qlist(&qlist);
}
static int reset_queues_for_apids(struct ap_matrix_mdev *matrix_mdev,
unsigned long *apm_reset)
{
struct list_head qlist;
unsigned long apid;
if (bitmap_empty(apm_reset, AP_DEVICES))
return 0;
INIT_LIST_HEAD(&qlist);
for_each_set_bit_inv(apid, apm_reset, AP_DEVICES)
collect_queues_to_reset(matrix_mdev, apid, &qlist);
return vfio_ap_mdev_reset_qlist(&qlist);
}
/**
* assign_adapter_store - parses the APID from @buf and sets the
* corresponding bit in the mediated matrix device's APM
*
* @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
*
* Return: 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
*
* 5. -EAGAIN
* A lock required to validate the mdev's AP configuration could not
* be obtained.
*/
static ssize_t assign_adapter_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
unsigned long apid;
DECLARE_BITMAP(apm_filtered, AP_DEVICES);
struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
mutex_lock(&ap_perms_mutex);
get_update_locks_for_mdev(matrix_mdev);
ret = kstrtoul(buf, 0, &apid);
if (ret)
goto done;
if (apid > matrix_mdev->matrix.apm_max) {
ret = -ENODEV;
goto done;
}
if (test_bit_inv(apid, matrix_mdev->matrix.apm)) {
ret = count;
goto done;
}
set_bit_inv(apid, matrix_mdev->matrix.apm);
ret = vfio_ap_mdev_validate_masks(matrix_mdev);
if (ret) {
clear_bit_inv(apid, matrix_mdev->matrix.apm);
goto done;
}
vfio_ap_mdev_link_adapter(matrix_mdev, apid);
if (vfio_ap_mdev_filter_matrix(matrix_mdev, apm_filtered)) {
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
reset_queues_for_apids(matrix_mdev, apm_filtered);
}
ret = count;
done:
release_update_locks_for_mdev(matrix_mdev);
mutex_unlock(&ap_perms_mutex);
return ret;
}
static DEVICE_ATTR_WO(assign_adapter);
static struct vfio_ap_queue
*vfio_ap_unlink_apqn_fr_mdev(struct ap_matrix_mdev *matrix_mdev,
unsigned long apid, unsigned long apqi)
{
struct vfio_ap_queue *q = NULL;
q = vfio_ap_mdev_get_queue(matrix_mdev, AP_MKQID(apid, apqi));
/* If the queue is assigned to the matrix mdev, unlink it. */
if (q)
vfio_ap_unlink_queue_fr_mdev(q);
return q;
}
/**
* vfio_ap_mdev_unlink_adapter - unlink all queues associated with unassigned
* adapter from the matrix mdev to which the
* adapter was assigned.
* @matrix_mdev: the matrix mediated device to which the adapter was assigned.
* @apid: the APID of the unassigned adapter.
* @qlist: list for storing queues associated with unassigned adapter that
* need to be reset.
*/
static void vfio_ap_mdev_unlink_adapter(struct ap_matrix_mdev *matrix_mdev,
unsigned long apid,
struct list_head *qlist)
{
unsigned long apqi;
struct vfio_ap_queue *q;
for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, AP_DOMAINS) {
q = vfio_ap_unlink_apqn_fr_mdev(matrix_mdev, apid, apqi);
if (q && qlist) {
if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm) &&
test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm))
list_add_tail(&q->reset_qnode, qlist);
}
}
}
static void vfio_ap_mdev_hot_unplug_adapter(struct ap_matrix_mdev *matrix_mdev,
unsigned long apid)
{
struct vfio_ap_queue *q, *tmpq;
struct list_head qlist;
INIT_LIST_HEAD(&qlist);
vfio_ap_mdev_unlink_adapter(matrix_mdev, apid, &qlist);
if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm)) {
clear_bit_inv(apid, matrix_mdev->shadow_apcb.apm);
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
}
vfio_ap_mdev_reset_qlist(&qlist);
list_for_each_entry_safe(q, tmpq, &qlist, reset_qnode) {
vfio_ap_unlink_mdev_fr_queue(q);
list_del(&q->reset_qnode);
}
}
/**
* unassign_adapter_store - parses the APID from @buf and clears the
* corresponding bit in the mediated matrix device's APM
*
* @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
*
* Return: 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 ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
get_update_locks_for_mdev(matrix_mdev);
ret = kstrtoul(buf, 0, &apid);
if (ret)
goto done;
if (apid > matrix_mdev->matrix.apm_max) {
ret = -ENODEV;
goto done;
}
if (!test_bit_inv(apid, matrix_mdev->matrix.apm)) {
ret = count;
goto done;
}
clear_bit_inv((unsigned long)apid, matrix_mdev->matrix.apm);
vfio_ap_mdev_hot_unplug_adapter(matrix_mdev, apid);
ret = count;
done:
release_update_locks_for_mdev(matrix_mdev);
return ret;
}
static DEVICE_ATTR_WO(unassign_adapter);
static void vfio_ap_mdev_link_domain(struct ap_matrix_mdev *matrix_mdev,
unsigned long apqi)
{
unsigned long apid;
for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, AP_DEVICES)
vfio_ap_mdev_link_apqn(matrix_mdev,
AP_MKQID(apid, apqi));
}
/**
* assign_domain_store - parses the APQI from @buf and sets the
* corresponding bit in the mediated matrix device's AQM
*
* @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
*
* Return: 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
*
* 5. -EAGAIN
* The lock required to validate the mdev's AP configuration could not
* be obtained.
*/
static ssize_t assign_domain_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
unsigned long apqi;
DECLARE_BITMAP(apm_filtered, AP_DEVICES);
struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
mutex_lock(&ap_perms_mutex);
get_update_locks_for_mdev(matrix_mdev);
ret = kstrtoul(buf, 0, &apqi);
if (ret)
goto done;
if (apqi > matrix_mdev->matrix.aqm_max) {
ret = -ENODEV;
goto done;
}
if (test_bit_inv(apqi, matrix_mdev->matrix.aqm)) {
ret = count;
goto done;
}
set_bit_inv(apqi, matrix_mdev->matrix.aqm);
ret = vfio_ap_mdev_validate_masks(matrix_mdev);
if (ret) {
clear_bit_inv(apqi, matrix_mdev->matrix.aqm);
goto done;
}
vfio_ap_mdev_link_domain(matrix_mdev, apqi);
if (vfio_ap_mdev_filter_matrix(matrix_mdev, apm_filtered)) {
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
reset_queues_for_apids(matrix_mdev, apm_filtered);
}
ret = count;
done:
release_update_locks_for_mdev(matrix_mdev);
mutex_unlock(&ap_perms_mutex);
return ret;
}
static DEVICE_ATTR_WO(assign_domain);
static void vfio_ap_mdev_unlink_domain(struct ap_matrix_mdev *matrix_mdev,
unsigned long apqi,
struct list_head *qlist)
{
unsigned long apid;
struct vfio_ap_queue *q;
for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, AP_DEVICES) {
q = vfio_ap_unlink_apqn_fr_mdev(matrix_mdev, apid, apqi);
if (q && qlist) {
if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm) &&
test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm))
list_add_tail(&q->reset_qnode, qlist);
}
}
}
static void vfio_ap_mdev_hot_unplug_domain(struct ap_matrix_mdev *matrix_mdev,
unsigned long apqi)
{
struct vfio_ap_queue *q, *tmpq;
struct list_head qlist;
INIT_LIST_HEAD(&qlist);
vfio_ap_mdev_unlink_domain(matrix_mdev, apqi, &qlist);
if (test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm)) {
clear_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm);
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
}
vfio_ap_mdev_reset_qlist(&qlist);
list_for_each_entry_safe(q, tmpq, &qlist, reset_qnode) {
vfio_ap_unlink_mdev_fr_queue(q);
list_del(&q->reset_qnode);
}
}
/**
* unassign_domain_store - parses the APQI from @buf and clears the
* corresponding bit in the mediated matrix device's AQM
*
* @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
*
* Return: 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 ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
get_update_locks_for_mdev(matrix_mdev);
ret = kstrtoul(buf, 0, &apqi);
if (ret)
goto done;
if (apqi > matrix_mdev->matrix.aqm_max) {
ret = -ENODEV;
goto done;
}
if (!test_bit_inv(apqi, matrix_mdev->matrix.aqm)) {
ret = count;
goto done;
}
clear_bit_inv((unsigned long)apqi, matrix_mdev->matrix.aqm);
vfio_ap_mdev_hot_unplug_domain(matrix_mdev, apqi);
ret = count;
done:
release_update_locks_for_mdev(matrix_mdev);
return ret;
}
static DEVICE_ATTR_WO(unassign_domain);
/**
* assign_control_domain_store - parses the domain ID from @buf and sets
* the corresponding bit in the mediated matrix device's ADM
*
* @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
*
* Return: 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 ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
get_update_locks_for_mdev(matrix_mdev);
ret = kstrtoul(buf, 0, &id);
if (ret)
goto done;
if (id > matrix_mdev->matrix.adm_max) {
ret = -ENODEV;
goto done;
}
if (test_bit_inv(id, matrix_mdev->matrix.adm)) {
ret = count;
goto done;
}
/* 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.
*/
set_bit_inv(id, matrix_mdev->matrix.adm);
if (vfio_ap_mdev_filter_cdoms(matrix_mdev))
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
ret = count;
done:
release_update_locks_for_mdev(matrix_mdev);
return ret;
}
static DEVICE_ATTR_WO(assign_control_domain);
/**
* unassign_control_domain_store - parses the domain ID from @buf and
* clears the corresponding bit in the mediated matrix device's ADM
*
* @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
*
* Return: 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 ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
get_update_locks_for_mdev(matrix_mdev);
ret = kstrtoul(buf, 0, &domid);
if (ret)
goto done;
if (domid > matrix_mdev->matrix.adm_max) {
ret = -ENODEV;
goto done;
}
if (!test_bit_inv(domid, matrix_mdev->matrix.adm)) {
ret = count;
goto done;
}
clear_bit_inv(domid, matrix_mdev->matrix.adm);
if (test_bit_inv(domid, matrix_mdev->shadow_apcb.adm)) {
clear_bit_inv(domid, matrix_mdev->shadow_apcb.adm);
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
}
ret = count;
done:
release_update_locks_for_mdev(matrix_mdev);
return ret;
}
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 ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
unsigned long max_domid = matrix_mdev->matrix.adm_max;
mutex_lock(&matrix_dev->mdevs_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->mdevs_lock);
return nchars;
}
static DEVICE_ATTR_RO(control_domains);
static ssize_t vfio_ap_mdev_matrix_show(struct ap_matrix *matrix, char *buf)
{
char *bufpos = buf;
unsigned long apid;
unsigned long apqi;
unsigned long apid1;
unsigned long apqi1;
unsigned long napm_bits = matrix->apm_max + 1;
unsigned long naqm_bits = matrix->aqm_max + 1;
int nchars = 0;
int n;
apid1 = find_first_bit_inv(matrix->apm, napm_bits);
apqi1 = find_first_bit_inv(matrix->aqm, naqm_bits);
if ((apid1 < napm_bits) && (apqi1 < naqm_bits)) {
for_each_set_bit_inv(apid, matrix->apm, napm_bits) {
for_each_set_bit_inv(apqi, 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->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->aqm, naqm_bits) {
n = sprintf(bufpos, ".%04lx\n", apqi);
bufpos += n;
nchars += n;
}
}
return nchars;
}
static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
ssize_t nchars;
struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
mutex_lock(&matrix_dev->mdevs_lock);
nchars = vfio_ap_mdev_matrix_show(&matrix_mdev->matrix, buf);
mutex_unlock(&matrix_dev->mdevs_lock);
return nchars;
}
static DEVICE_ATTR_RO(matrix);
static ssize_t guest_matrix_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
ssize_t nchars;
struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
mutex_lock(&matrix_dev->mdevs_lock);
nchars = vfio_ap_mdev_matrix_show(&matrix_mdev->shadow_apcb, buf);
mutex_unlock(&matrix_dev->mdevs_lock);
return nchars;
}
static DEVICE_ATTR_RO(guest_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,
&dev_attr_guest_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 - sets all data for @matrix_mdev that are needed
* to manage AP resources for the guest whose state is represented by @kvm
*
* @matrix_mdev: a mediated matrix device
* @kvm: reference to KVM instance
*
* 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;
if (kvm->arch.crypto.crycbd) {
down_write(&kvm->arch.crypto.pqap_hook_rwsem);
kvm->arch.crypto.pqap_hook = &matrix_mdev->pqap_hook;
up_write(&kvm->arch.crypto.pqap_hook_rwsem);
get_update_locks_for_kvm(kvm);
list_for_each_entry(m, &matrix_dev->mdev_list, node) {
if (m != matrix_mdev && m->kvm == kvm) {
release_update_locks_for_kvm(kvm);
return -EPERM;
}
}
kvm_get_kvm(kvm);
matrix_mdev->kvm = kvm;
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
release_update_locks_for_kvm(kvm);
}
return 0;
}
static void unmap_iova(struct ap_matrix_mdev *matrix_mdev, u64 iova, u64 length)
{
struct ap_queue_table *qtable = &matrix_mdev->qtable;
struct vfio_ap_queue *q;
int loop_cursor;
hash_for_each(qtable->queues, loop_cursor, q, mdev_qnode) {
if (q->saved_iova >= iova && q->saved_iova < iova + length)
vfio_ap_irq_disable(q);
}
}
static void vfio_ap_mdev_dma_unmap(struct vfio_device *vdev, u64 iova,
u64 length)
{
struct ap_matrix_mdev *matrix_mdev =
container_of(vdev, struct ap_matrix_mdev, vdev);
mutex_lock(&matrix_dev->mdevs_lock);
unmap_iova(matrix_mdev, iova, length);
mutex_unlock(&matrix_dev->mdevs_lock);
}
/**
* vfio_ap_mdev_unset_kvm - performs clean-up of resources no longer needed
* by @matrix_mdev.
*
* @matrix_mdev: a matrix mediated device
*/
static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev)
{
struct kvm *kvm = matrix_mdev->kvm;
if (kvm && kvm->arch.crypto.crycbd) {
down_write(&kvm->arch.crypto.pqap_hook_rwsem);
kvm->arch.crypto.pqap_hook = NULL;
up_write(&kvm->arch.crypto.pqap_hook_rwsem);
get_update_locks_for_kvm(kvm);
kvm_arch_crypto_clear_masks(kvm);
vfio_ap_mdev_reset_queues(matrix_mdev);
kvm_put_kvm(kvm);
matrix_mdev->kvm = NULL;
release_update_locks_for_kvm(kvm);
}
}
static struct vfio_ap_queue *vfio_ap_find_queue(int apqn)
{
struct ap_queue *queue;
struct vfio_ap_queue *q = NULL;
queue = ap_get_qdev(apqn);
if (!queue)
return NULL;
if (queue->ap_dev.device.driver == &matrix_dev->vfio_ap_drv->driver)
q = dev_get_drvdata(&queue->ap_dev.device);
put_device(&queue->ap_dev.device);
return q;
}
static int apq_status_check(int apqn, struct ap_queue_status *status)
{
switch (status->response_code) {
case AP_RESPONSE_NORMAL:
case AP_RESPONSE_DECONFIGURED:
return 0;
case AP_RESPONSE_RESET_IN_PROGRESS:
case AP_RESPONSE_BUSY:
return -EBUSY;
case AP_RESPONSE_ASSOC_SECRET_NOT_UNIQUE:
case AP_RESPONSE_ASSOC_FAILED:
/*
* These asynchronous response codes indicate a PQAP(AAPQ)
* instruction to associate a secret with the guest failed. All
* subsequent AP instructions will end with the asynchronous
* response code until the AP queue is reset; so, let's return
* a value indicating a reset needs to be performed again.
*/
return -EAGAIN;
default:
WARN(true,
"failed to verify reset of queue %02x.%04x: TAPQ rc=%u\n",
AP_QID_CARD(apqn), AP_QID_QUEUE(apqn),
status->response_code);
return -EIO;
}
}
#define WAIT_MSG "Waited %dms for reset of queue %02x.%04x (%u, %u, %u)"
static void apq_reset_check(struct work_struct *reset_work)
{
int ret = -EBUSY, elapsed = 0;
struct ap_queue_status status;
struct vfio_ap_queue *q;
q = container_of(reset_work, struct vfio_ap_queue, reset_work);
memcpy(&status, &q->reset_status, sizeof(status));
while (true) {
msleep(AP_RESET_INTERVAL);
elapsed += AP_RESET_INTERVAL;
status = ap_tapq(q->apqn, NULL);
ret = apq_status_check(q->apqn, &status);
if (ret == -EIO)
return;
if (ret == -EBUSY) {
pr_notice_ratelimited(WAIT_MSG, elapsed,
AP_QID_CARD(q->apqn),
AP_QID_QUEUE(q->apqn),
status.response_code,
status.queue_empty,
status.irq_enabled);
} else {
if (q->reset_status.response_code == AP_RESPONSE_RESET_IN_PROGRESS ||
q->reset_status.response_code == AP_RESPONSE_BUSY ||
q->reset_status.response_code == AP_RESPONSE_STATE_CHANGE_IN_PROGRESS ||
ret == -EAGAIN) {
status = ap_zapq(q->apqn, 0);
memcpy(&q->reset_status, &status, sizeof(status));
continue;
}
/*
* When an AP adapter is deconfigured, the
* associated queues are reset, so let's set the
* status response code to 0 so the queue may be
* passed through (i.e., not filtered)
*/
if (status.response_code == AP_RESPONSE_DECONFIGURED)
q->reset_status.response_code = 0;
if (q->saved_isc != VFIO_AP_ISC_INVALID)
vfio_ap_free_aqic_resources(q);
break;
}
}
}
static void vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q)
{
struct ap_queue_status status;
if (!q)
return;
status = ap_zapq(q->apqn, 0);
memcpy(&q->reset_status, &status, sizeof(status));
switch (status.response_code) {
case AP_RESPONSE_NORMAL:
case AP_RESPONSE_RESET_IN_PROGRESS:
case AP_RESPONSE_BUSY:
case AP_RESPONSE_STATE_CHANGE_IN_PROGRESS:
/*
* Let's verify whether the ZAPQ completed successfully on a work queue.
*/
queue_work(system_long_wq, &q->reset_work);
break;
case AP_RESPONSE_DECONFIGURED:
/*
* When an AP adapter is deconfigured, the associated
* queues are reset, so let's set the status response code to 0
* so the queue may be passed through (i.e., not filtered).
*/
q->reset_status.response_code = 0;
vfio_ap_free_aqic_resources(q);
break;
default:
WARN(true,
"PQAP/ZAPQ for %02x.%04x failed with invalid rc=%u\n",
AP_QID_CARD(q->apqn), AP_QID_QUEUE(q->apqn),
status.response_code);
}
}
static int vfio_ap_mdev_reset_queues(struct ap_matrix_mdev *matrix_mdev)
{
int ret = 0, loop_cursor;
struct vfio_ap_queue *q;
hash_for_each(matrix_mdev->qtable.queues, loop_cursor, q, mdev_qnode)
vfio_ap_mdev_reset_queue(q);
hash_for_each(matrix_mdev->qtable.queues, loop_cursor, q, mdev_qnode) {
flush_work(&q->reset_work);
if (q->reset_status.response_code)
ret = -EIO;
}
return ret;
}
static int vfio_ap_mdev_reset_qlist(struct list_head *qlist)
{
int ret = 0;
struct vfio_ap_queue *q;
list_for_each_entry(q, qlist, reset_qnode)
vfio_ap_mdev_reset_queue(q);
list_for_each_entry(q, qlist, reset_qnode) {
flush_work(&q->reset_work);
if (q->reset_status.response_code)
ret = -EIO;
}
return ret;
}
static int vfio_ap_mdev_open_device(struct vfio_device *vdev)
{
struct ap_matrix_mdev *matrix_mdev =
container_of(vdev, struct ap_matrix_mdev, vdev);
if (!vdev->kvm)
return -EINVAL;
return vfio_ap_mdev_set_kvm(matrix_mdev, vdev->kvm);
}
static void vfio_ap_mdev_close_device(struct vfio_device *vdev)
{
struct ap_matrix_mdev *matrix_mdev =
container_of(vdev, struct ap_matrix_mdev, vdev);
vfio_ap_mdev_unset_kvm(matrix_mdev);
}
static void vfio_ap_mdev_request(struct vfio_device *vdev, unsigned int count)
{
struct device *dev = vdev->dev;
struct ap_matrix_mdev *matrix_mdev;
matrix_mdev = container_of(vdev, struct ap_matrix_mdev, vdev);
if (matrix_mdev->req_trigger) {
if (!(count % 10))
dev_notice_ratelimited(dev,
"Relaying device request to user (#%u)\n",
count);
eventfd_signal(matrix_mdev->req_trigger);
} else if (count == 0) {
dev_notice(dev,
"No device request registered, blocked until released by user\n");
}
}
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 = VFIO_AP_NUM_IRQS;
return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
}
static ssize_t vfio_ap_get_irq_info(unsigned long arg)
{
unsigned long minsz;
struct vfio_irq_info info;
minsz = offsetofend(struct vfio_irq_info, count);
if (copy_from_user(&info, (void __user *)arg, minsz))
return -EFAULT;
if (info.argsz < minsz || info.index >= VFIO_AP_NUM_IRQS)
return -EINVAL;
switch (info.index) {
case VFIO_AP_REQ_IRQ_INDEX:
info.count = 1;
info.flags = VFIO_IRQ_INFO_EVENTFD;
break;
default:
return -EINVAL;
}
return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
}
static int vfio_ap_irq_set_init(struct vfio_irq_set *irq_set, unsigned long arg)
{
int ret;
size_t data_size;
unsigned long minsz;
minsz = offsetofend(struct vfio_irq_set, count);
if (copy_from_user(irq_set, (void __user *)arg, minsz))
return -EFAULT;
ret = vfio_set_irqs_validate_and_prepare(irq_set, 1, VFIO_AP_NUM_IRQS,
&data_size);
if (ret)
return ret;
if (!(irq_set->flags & VFIO_IRQ_SET_ACTION_TRIGGER))
return -EINVAL;
return 0;
}
static int vfio_ap_set_request_irq(struct ap_matrix_mdev *matrix_mdev,
unsigned long arg)
{
s32 fd;
void __user *data;
unsigned long minsz;
struct eventfd_ctx *req_trigger;
minsz = offsetofend(struct vfio_irq_set, count);
data = (void __user *)(arg + minsz);
if (get_user(fd, (s32 __user *)data))
return -EFAULT;
if (fd == -1) {
if (matrix_mdev->req_trigger)
eventfd_ctx_put(matrix_mdev->req_trigger);
matrix_mdev->req_trigger = NULL;
} else if (fd >= 0) {
req_trigger = eventfd_ctx_fdget(fd);
if (IS_ERR(req_trigger))
return PTR_ERR(req_trigger);
if (matrix_mdev->req_trigger)
eventfd_ctx_put(matrix_mdev->req_trigger);
matrix_mdev->req_trigger = req_trigger;
} else {
return -EINVAL;
}
return 0;
}
static int vfio_ap_set_irqs(struct ap_matrix_mdev *matrix_mdev,
unsigned long arg)
{
int ret;
struct vfio_irq_set irq_set;
ret = vfio_ap_irq_set_init(&irq_set, arg);
if (ret)
return ret;
switch (irq_set.flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {
case VFIO_IRQ_SET_DATA_EVENTFD:
switch (irq_set.index) {
case VFIO_AP_REQ_IRQ_INDEX:
return vfio_ap_set_request_irq(matrix_mdev, arg);
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static ssize_t vfio_ap_mdev_ioctl(struct vfio_device *vdev,
unsigned int cmd, unsigned long arg)
{
struct ap_matrix_mdev *matrix_mdev =
container_of(vdev, struct ap_matrix_mdev, vdev);
int ret;
mutex_lock(&matrix_dev->mdevs_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(matrix_mdev);
break;
case VFIO_DEVICE_GET_IRQ_INFO:
ret = vfio_ap_get_irq_info(arg);
break;
case VFIO_DEVICE_SET_IRQS:
ret = vfio_ap_set_irqs(matrix_mdev, arg);
break;
default:
ret = -EOPNOTSUPP;
break;
}
mutex_unlock(&matrix_dev->mdevs_lock);
return ret;
}
static struct ap_matrix_mdev *vfio_ap_mdev_for_queue(struct vfio_ap_queue *q)
{
struct ap_matrix_mdev *matrix_mdev;
unsigned long apid = AP_QID_CARD(q->apqn);
unsigned long apqi = AP_QID_QUEUE(q->apqn);
list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
if (test_bit_inv(apid, matrix_mdev->matrix.apm) &&
test_bit_inv(apqi, matrix_mdev->matrix.aqm))
return matrix_mdev;
}
return NULL;
}
static ssize_t status_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
ssize_t nchars = 0;
struct vfio_ap_queue *q;
unsigned long apid, apqi;
struct ap_matrix_mdev *matrix_mdev;
struct ap_device *apdev = to_ap_dev(dev);
mutex_lock(&matrix_dev->mdevs_lock);
q = dev_get_drvdata(&apdev->device);
matrix_mdev = vfio_ap_mdev_for_queue(q);
/* If the queue is assigned to the matrix mediated device, then
* determine whether it is passed through to a guest; otherwise,
* indicate that it is unassigned.
*/
if (matrix_mdev) {
apid = AP_QID_CARD(q->apqn);
apqi = AP_QID_QUEUE(q->apqn);
/*
* If the queue is passed through to the guest, then indicate
* that it is in use; otherwise, indicate that it is
* merely assigned to a matrix mediated device.
*/
if (matrix_mdev->kvm &&
test_bit_inv(apid, matrix_mdev->shadow_apcb.apm) &&
test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm))
nchars = scnprintf(buf, PAGE_SIZE, "%s\n",
AP_QUEUE_IN_USE);
else
nchars = scnprintf(buf, PAGE_SIZE, "%s\n",
AP_QUEUE_ASSIGNED);
} else {
nchars = scnprintf(buf, PAGE_SIZE, "%s\n",
AP_QUEUE_UNASSIGNED);
}
mutex_unlock(&matrix_dev->mdevs_lock);
return nchars;
}
static DEVICE_ATTR_RO(status);
static struct attribute *vfio_queue_attrs[] = {
&dev_attr_status.attr,
NULL,
};
static const struct attribute_group vfio_queue_attr_group = {
.attrs = vfio_queue_attrs,
};
static const struct vfio_device_ops vfio_ap_matrix_dev_ops = {
.init = vfio_ap_mdev_init_dev,
.open_device = vfio_ap_mdev_open_device,
.close_device = vfio_ap_mdev_close_device,
.ioctl = vfio_ap_mdev_ioctl,
.dma_unmap = vfio_ap_mdev_dma_unmap,
.bind_iommufd = vfio_iommufd_emulated_bind,
.unbind_iommufd = vfio_iommufd_emulated_unbind,
.attach_ioas = vfio_iommufd_emulated_attach_ioas,
.detach_ioas = vfio_iommufd_emulated_detach_ioas,
.request = vfio_ap_mdev_request
};
static struct mdev_driver vfio_ap_matrix_driver = {
.device_api = VFIO_DEVICE_API_AP_STRING,
.max_instances = MAX_ZDEV_ENTRIES_EXT,
.driver = {
.name = "vfio_ap_mdev",
.owner = THIS_MODULE,
.mod_name = KBUILD_MODNAME,
.dev_groups = vfio_ap_mdev_attr_groups,
},
.probe = vfio_ap_mdev_probe,
.remove = vfio_ap_mdev_remove,
};
int vfio_ap_mdev_register(void)
{
int ret;
ret = mdev_register_driver(&vfio_ap_matrix_driver);
if (ret)
return ret;
matrix_dev->mdev_type.sysfs_name = VFIO_AP_MDEV_TYPE_HWVIRT;
matrix_dev->mdev_type.pretty_name = VFIO_AP_MDEV_NAME_HWVIRT;
matrix_dev->mdev_types[0] = &matrix_dev->mdev_type;
ret = mdev_register_parent(&matrix_dev->parent, &matrix_dev->device,
&vfio_ap_matrix_driver,
matrix_dev->mdev_types, 1);
if (ret)
goto err_driver;
return 0;
err_driver:
mdev_unregister_driver(&vfio_ap_matrix_driver);
return ret;
}
void vfio_ap_mdev_unregister(void)
{
mdev_unregister_parent(&matrix_dev->parent);
mdev_unregister_driver(&vfio_ap_matrix_driver);
}
int vfio_ap_mdev_probe_queue(struct ap_device *apdev)
{
int ret;
struct vfio_ap_queue *q;
DECLARE_BITMAP(apm_filtered, AP_DEVICES);
struct ap_matrix_mdev *matrix_mdev;
ret = sysfs_create_group(&apdev->device.kobj, &vfio_queue_attr_group);
if (ret)
return ret;
q = kzalloc(sizeof(*q), GFP_KERNEL);
if (!q) {
ret = -ENOMEM;
goto err_remove_group;
}
q->apqn = to_ap_queue(&apdev->device)->qid;
q->saved_isc = VFIO_AP_ISC_INVALID;
memset(&q->reset_status, 0, sizeof(q->reset_status));
INIT_WORK(&q->reset_work, apq_reset_check);
matrix_mdev = get_update_locks_by_apqn(q->apqn);
if (matrix_mdev) {
vfio_ap_mdev_link_queue(matrix_mdev, q);
/*
* If we're in the process of handling the adding of adapters or
* domains to the host's AP configuration, then let the
* vfio_ap device driver's on_scan_complete callback filter the
* matrix and update the guest's AP configuration after all of
* the new queue devices are probed.
*/
if (!bitmap_empty(matrix_mdev->apm_add, AP_DEVICES) ||
!bitmap_empty(matrix_mdev->aqm_add, AP_DOMAINS))
goto done;
if (vfio_ap_mdev_filter_matrix(matrix_mdev, apm_filtered)) {
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
reset_queues_for_apids(matrix_mdev, apm_filtered);
}
}
done:
dev_set_drvdata(&apdev->device, q);
release_update_locks_for_mdev(matrix_mdev);
return ret;
err_remove_group:
sysfs_remove_group(&apdev->device.kobj, &vfio_queue_attr_group);
return ret;
}
void vfio_ap_mdev_remove_queue(struct ap_device *apdev)
{
unsigned long apid, apqi;
struct vfio_ap_queue *q;
struct ap_matrix_mdev *matrix_mdev;
sysfs_remove_group(&apdev->device.kobj, &vfio_queue_attr_group);
q = dev_get_drvdata(&apdev->device);
get_update_locks_for_queue(q);
matrix_mdev = q->matrix_mdev;
apid = AP_QID_CARD(q->apqn);
apqi = AP_QID_QUEUE(q->apqn);
if (matrix_mdev) {
/* If the queue is assigned to the guest's AP configuration */
if (test_bit_inv(apid, matrix_mdev->shadow_apcb.apm) &&
test_bit_inv(apqi, matrix_mdev->shadow_apcb.aqm)) {
/*
* Since the queues are defined via a matrix of adapters
* and domains, it is not possible to hot unplug a
* single queue; so, let's unplug the adapter.
*/
clear_bit_inv(apid, matrix_mdev->shadow_apcb.apm);
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
reset_queues_for_apid(matrix_mdev, apid);
goto done;
}
}
/*
* If the queue is not in the host's AP configuration, then resetting
* it will fail with response code 01, (APQN not valid); so, let's make
* sure it is in the host's config.
*/
if (test_bit_inv(apid, (unsigned long *)matrix_dev->info.apm) &&
test_bit_inv(apqi, (unsigned long *)matrix_dev->info.aqm)) {
vfio_ap_mdev_reset_queue(q);
flush_work(&q->reset_work);
}
done:
if (matrix_mdev)
vfio_ap_unlink_queue_fr_mdev(q);
dev_set_drvdata(&apdev->device, NULL);
kfree(q);
release_update_locks_for_mdev(matrix_mdev);
}
/**
* vfio_ap_mdev_resource_in_use: check whether any of a set of APQNs is
* assigned to a mediated device under the control
* of the vfio_ap device driver.
*
* @apm: a bitmap specifying a set of APIDs comprising the APQNs to check.
* @aqm: a bitmap specifying a set of APQIs comprising the APQNs to check.
*
* Return:
* * -EADDRINUSE if one or more of the APQNs specified via @apm/@aqm are
* assigned to a mediated device under the control of the vfio_ap
* device driver.
* * Otherwise, return 0.
*/
int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm)
{
int ret;
mutex_lock(&matrix_dev->guests_lock);
mutex_lock(&matrix_dev->mdevs_lock);
ret = vfio_ap_mdev_verify_no_sharing(apm, aqm);
mutex_unlock(&matrix_dev->mdevs_lock);
mutex_unlock(&matrix_dev->guests_lock);
return ret;
}
/**
* vfio_ap_mdev_hot_unplug_cfg - hot unplug the adapters, domains and control
* domains that have been removed from the host's
* AP configuration from a guest.
*
* @matrix_mdev: an ap_matrix_mdev object attached to a KVM guest.
* @aprem: the adapters that have been removed from the host's AP configuration
* @aqrem: the domains that have been removed from the host's AP configuration
* @cdrem: the control domains that have been removed from the host's AP
* configuration.
*/
static void vfio_ap_mdev_hot_unplug_cfg(struct ap_matrix_mdev *matrix_mdev,
unsigned long *aprem,
unsigned long *aqrem,
unsigned long *cdrem)
{
int do_hotplug = 0;
if (!bitmap_empty(aprem, AP_DEVICES)) {
do_hotplug |= bitmap_andnot(matrix_mdev->shadow_apcb.apm,
matrix_mdev->shadow_apcb.apm,
aprem, AP_DEVICES);
}
if (!bitmap_empty(aqrem, AP_DOMAINS)) {
do_hotplug |= bitmap_andnot(matrix_mdev->shadow_apcb.aqm,
matrix_mdev->shadow_apcb.aqm,
aqrem, AP_DEVICES);
}
if (!bitmap_empty(cdrem, AP_DOMAINS))
do_hotplug |= bitmap_andnot(matrix_mdev->shadow_apcb.adm,
matrix_mdev->shadow_apcb.adm,
cdrem, AP_DOMAINS);
if (do_hotplug)
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
}
/**
* vfio_ap_mdev_cfg_remove - determines which guests are using the adapters,
* domains and control domains that have been removed
* from the host AP configuration and unplugs them
* from those guests.
*
* @ap_remove: bitmap specifying which adapters have been removed from the host
* config.
* @aq_remove: bitmap specifying which domains have been removed from the host
* config.
* @cd_remove: bitmap specifying which control domains have been removed from
* the host config.
*/
static void vfio_ap_mdev_cfg_remove(unsigned long *ap_remove,
unsigned long *aq_remove,
unsigned long *cd_remove)
{
struct ap_matrix_mdev *matrix_mdev;
DECLARE_BITMAP(aprem, AP_DEVICES);
DECLARE_BITMAP(aqrem, AP_DOMAINS);
DECLARE_BITMAP(cdrem, AP_DOMAINS);
int do_remove = 0;
list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
mutex_lock(&matrix_mdev->kvm->lock);
mutex_lock(&matrix_dev->mdevs_lock);
do_remove |= bitmap_and(aprem, ap_remove,
matrix_mdev->matrix.apm,
AP_DEVICES);
do_remove |= bitmap_and(aqrem, aq_remove,
matrix_mdev->matrix.aqm,
AP_DOMAINS);
do_remove |= bitmap_andnot(cdrem, cd_remove,
matrix_mdev->matrix.adm,
AP_DOMAINS);
if (do_remove)
vfio_ap_mdev_hot_unplug_cfg(matrix_mdev, aprem, aqrem,
cdrem);
mutex_unlock(&matrix_dev->mdevs_lock);
mutex_unlock(&matrix_mdev->kvm->lock);
}
}
/**
* vfio_ap_mdev_on_cfg_remove - responds to the removal of adapters, domains and
* control domains from the host AP configuration
* by unplugging them from the guests that are
* using them.
* @cur_config_info: the current host AP configuration information
* @prev_config_info: the previous host AP configuration information
*/
static void vfio_ap_mdev_on_cfg_remove(struct ap_config_info *cur_config_info,
struct ap_config_info *prev_config_info)
{
int do_remove;
DECLARE_BITMAP(aprem, AP_DEVICES);
DECLARE_BITMAP(aqrem, AP_DOMAINS);
DECLARE_BITMAP(cdrem, AP_DOMAINS);
do_remove = bitmap_andnot(aprem,
(unsigned long *)prev_config_info->apm,
(unsigned long *)cur_config_info->apm,
AP_DEVICES);
do_remove |= bitmap_andnot(aqrem,
(unsigned long *)prev_config_info->aqm,
(unsigned long *)cur_config_info->aqm,
AP_DEVICES);
do_remove |= bitmap_andnot(cdrem,
(unsigned long *)prev_config_info->adm,
(unsigned long *)cur_config_info->adm,
AP_DEVICES);
if (do_remove)
vfio_ap_mdev_cfg_remove(aprem, aqrem, cdrem);
}
/**
* vfio_ap_filter_apid_by_qtype: filter APIDs from an AP mask for adapters that
* are older than AP type 10 (CEX4).
* @apm: a bitmap of the APIDs to examine
* @aqm: a bitmap of the APQIs of the queues to query for the AP type.
*/
static void vfio_ap_filter_apid_by_qtype(unsigned long *apm, unsigned long *aqm)
{
bool apid_cleared;
struct ap_queue_status status;
unsigned long apid, apqi;
struct ap_tapq_hwinfo info;
for_each_set_bit_inv(apid, apm, AP_DEVICES) {
apid_cleared = false;
for_each_set_bit_inv(apqi, aqm, AP_DOMAINS) {
status = ap_test_queue(AP_MKQID(apid, apqi), 1, &info);
switch (status.response_code) {
/*
* According to the architecture in each case
* below, the queue's info should be filled.
*/
case AP_RESPONSE_NORMAL:
case AP_RESPONSE_RESET_IN_PROGRESS:
case AP_RESPONSE_DECONFIGURED:
case AP_RESPONSE_CHECKSTOPPED:
case AP_RESPONSE_BUSY:
/*
* The vfio_ap device driver only
* supports CEX4 and newer adapters, so
* remove the APID if the adapter is
* older than a CEX4.
*/
if (info.at < AP_DEVICE_TYPE_CEX4) {
clear_bit_inv(apid, apm);
apid_cleared = true;
}
break;
default:
/*
* If we don't know the adapter type,
* clear its APID since it can't be
* determined whether the vfio_ap
* device driver supports it.
*/
clear_bit_inv(apid, apm);
apid_cleared = true;
break;
}
/*
* If we've already cleared the APID from the apm, there
* is no need to continue examining the remainin AP
* queues to determine the type of the adapter.
*/
if (apid_cleared)
continue;
}
}
}
/**
* vfio_ap_mdev_cfg_add - store bitmaps specifying the adapters, domains and
* control domains that have been added to the host's
* AP configuration for each matrix mdev to which they
* are assigned.
*
* @apm_add: a bitmap specifying the adapters that have been added to the AP
* configuration.
* @aqm_add: a bitmap specifying the domains that have been added to the AP
* configuration.
* @adm_add: a bitmap specifying the control domains that have been added to the
* AP configuration.
*/
static void vfio_ap_mdev_cfg_add(unsigned long *apm_add, unsigned long *aqm_add,
unsigned long *adm_add)
{
struct ap_matrix_mdev *matrix_mdev;
if (list_empty(&matrix_dev->mdev_list))
return;
vfio_ap_filter_apid_by_qtype(apm_add, aqm_add);
list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
bitmap_and(matrix_mdev->apm_add,
matrix_mdev->matrix.apm, apm_add, AP_DEVICES);
bitmap_and(matrix_mdev->aqm_add,
matrix_mdev->matrix.aqm, aqm_add, AP_DOMAINS);
bitmap_and(matrix_mdev->adm_add,
matrix_mdev->matrix.adm, adm_add, AP_DEVICES);
}
}
/**
* vfio_ap_mdev_on_cfg_add - responds to the addition of adapters, domains and
* control domains to the host AP configuration
* by updating the bitmaps that specify what adapters,
* domains and control domains have been added so they
* can be hot plugged into the guest when the AP bus
* scan completes (see vfio_ap_on_scan_complete
* function).
* @cur_config_info: the current AP configuration information
* @prev_config_info: the previous AP configuration information
*/
static void vfio_ap_mdev_on_cfg_add(struct ap_config_info *cur_config_info,
struct ap_config_info *prev_config_info)
{
bool do_add;
DECLARE_BITMAP(apm_add, AP_DEVICES);
DECLARE_BITMAP(aqm_add, AP_DOMAINS);
DECLARE_BITMAP(adm_add, AP_DOMAINS);
do_add = bitmap_andnot(apm_add,
(unsigned long *)cur_config_info->apm,
(unsigned long *)prev_config_info->apm,
AP_DEVICES);
do_add |= bitmap_andnot(aqm_add,
(unsigned long *)cur_config_info->aqm,
(unsigned long *)prev_config_info->aqm,
AP_DOMAINS);
do_add |= bitmap_andnot(adm_add,
(unsigned long *)cur_config_info->adm,
(unsigned long *)prev_config_info->adm,
AP_DOMAINS);
if (do_add)
vfio_ap_mdev_cfg_add(apm_add, aqm_add, adm_add);
}
/**
* vfio_ap_on_cfg_changed - handles notification of changes to the host AP
* configuration.
*
* @cur_cfg_info: the current host AP configuration
* @prev_cfg_info: the previous host AP configuration
*/
void vfio_ap_on_cfg_changed(struct ap_config_info *cur_cfg_info,
struct ap_config_info *prev_cfg_info)
{
if (!cur_cfg_info || !prev_cfg_info)
return;
mutex_lock(&matrix_dev->guests_lock);
vfio_ap_mdev_on_cfg_remove(cur_cfg_info, prev_cfg_info);
vfio_ap_mdev_on_cfg_add(cur_cfg_info, prev_cfg_info);
memcpy(&matrix_dev->info, cur_cfg_info, sizeof(*cur_cfg_info));
mutex_unlock(&matrix_dev->guests_lock);
}
static void vfio_ap_mdev_hot_plug_cfg(struct ap_matrix_mdev *matrix_mdev)
{
DECLARE_BITMAP(apm_filtered, AP_DEVICES);
bool filter_domains, filter_adapters, filter_cdoms, do_hotplug = false;
mutex_lock(&matrix_mdev->kvm->lock);
mutex_lock(&matrix_dev->mdevs_lock);
filter_adapters = bitmap_intersects(matrix_mdev->matrix.apm,
matrix_mdev->apm_add, AP_DEVICES);
filter_domains = bitmap_intersects(matrix_mdev->matrix.aqm,
matrix_mdev->aqm_add, AP_DOMAINS);
filter_cdoms = bitmap_intersects(matrix_mdev->matrix.adm,
matrix_mdev->adm_add, AP_DOMAINS);
if (filter_adapters || filter_domains)
do_hotplug = vfio_ap_mdev_filter_matrix(matrix_mdev, apm_filtered);
if (filter_cdoms)
do_hotplug |= vfio_ap_mdev_filter_cdoms(matrix_mdev);
if (do_hotplug)
vfio_ap_mdev_update_guest_apcb(matrix_mdev);
reset_queues_for_apids(matrix_mdev, apm_filtered);
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);
}
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