diff options
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/crypto/vfio_ap_ops.c | 74 |
1 files changed, 68 insertions, 6 deletions
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index abc0b9b88386..537d7dd158a7 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -16,10 +16,12 @@ #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" @@ -257,6 +259,48 @@ static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q, } /** + * 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 @@ -281,30 +325,48 @@ 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)) + 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; + } - apqn = vcpu->run->s.regs.gprs[0] & 0xffff; mutex_lock(&matrix_dev->lock); - - if (!vcpu->kvm->arch.crypto.pqap_hook) + 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) + 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_get_queue(matrix_mdev, apqn); - if (!q) + 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]; |