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s390 updates for 5.20 merge window

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- Rework copy_oldmem_page() callback to take an iov_iter.
   This includes few prerequisite updates and fixes to the
   oldmem reading code.
 
 - Rework cpufeature implementation to allow for various CPU feature
   indications, which is not only limited to hardware capabilities,
   but also allows CPU facilities.
 
 - Use the cpufeature rework to autoload Ultravisor module when CPU
   facility 158 is available.
 
 - Add ELF note type for encrypted CPU state of a protected virtual CPU.
   The zgetdump tool from s390-tools package will decrypt the CPU state
   using a Customer Communication Key and overwrite respective notes to
   make the data accessible for crash and other debugging tools.
 
 - Use vzalloc() instead of vmalloc() + memset() in ChaCha20 crypto test.
 
 - Fix incorrect recovery of kretprobe modified return address in stacktrace.
 
 - Switch the NMI handler to use generic irqentry_nmi_enter() and
   irqentry_nmi_exit() helper functions.
 
 - Rework the cryptographic Adjunct Processors (AP) pass-through design
   to support dynamic changes to the AP matrix of a running guest as well
   as to implement more of the AP architecture.
 
 - Minor boot code cleanups.
 
 - Grammar and typo fixes to hmcdrv and tape drivers.
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Merge tag 's390-5.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Alexander Gordeev:

 - Rework copy_oldmem_page() callback to take an iov_iter.

   This includes a few prerequisite updates and fixes to the oldmem
   reading code.

 - Rework cpufeature implementation to allow for various CPU feature
   indications, which is not only limited to hardware capabilities, but
   also allows CPU facilities.

 - Use the cpufeature rework to autoload Ultravisor module when CPU
   facility 158 is available.

 - Add ELF note type for encrypted CPU state of a protected virtual CPU.
   The zgetdump tool from s390-tools package will decrypt the CPU state
   using a Customer Communication Key and overwrite respective notes to
   make the data accessible for crash and other debugging tools.

 - Use vzalloc() instead of vmalloc() + memset() in ChaCha20 crypto
   test.

 - Fix incorrect recovery of kretprobe modified return address in
   stacktrace.

 - Switch the NMI handler to use generic irqentry_nmi_enter() and
   irqentry_nmi_exit() helper functions.

 - Rework the cryptographic Adjunct Processors (AP) pass-through design
   to support dynamic changes to the AP matrix of a running guest as
   well as to implement more of the AP architecture.

 - Minor boot code cleanups.

 - Grammar and typo fixes to hmcdrv and tape drivers.

* tag 's390-5.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (46 commits)
  Revert "s390/smp: enforce lowcore protection on CPU restart"
  Revert "s390/smp: rework absolute lowcore access"
  Revert "s390/smp,ptdump: add absolute lowcore markers"
  s390/unwind: fix fgraph return address recovery
  s390/nmi: use irqentry_nmi_enter()/irqentry_nmi_exit()
  s390: add ELF note type for encrypted CPU state of a PV VCPU
  s390/smp,ptdump: add absolute lowcore markers
  s390/smp: rework absolute lowcore access
  s390/setup: rearrange absolute lowcore initialization
  s390/boot: cleanup adjust_to_uv_max() function
  s390/smp: enforce lowcore protection on CPU restart
  s390/tape: fix comment typo
  s390/hmcdrv: fix Kconfig "its" grammar
  s390/docs: fix warnings for vfio_ap driver doc
  s390/docs: fix warnings for vfio_ap driver lock usage doc
  s390/crash: support multi-segment iterators
  s390/crash: use static swap buffer for copy_to_user_real()
  s390/crash: move copy_to_user_real() to crash_dump.c
  s390/zcore: fix race when reading from hardware system area
  s390/crash: fix incorrect number of bytes to copy to user space
  ...
This commit is contained in:
Linus Torvalds 2022-08-06 17:05:21 -07:00
commit 24cb958695
43 changed files with 1848 additions and 827 deletions
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1
Documentation/s390/index.rst
View File

@ -12,6 +12,7 @@ s390 Architecture
qeth
s390dbf
vfio-ap
vfio-ap-locking
vfio-ccw
zfcpdump
common_io

115
Documentation/s390/vfio-ap-locking.rst Normal file
View File

@ -0,0 +1,115 @@
.. SPDX-License-Identifier: GPL-2.0
======================
VFIO AP Locks Overview
======================
This document describes the locks that are pertinent to the secure operation
of the vfio_ap device driver. Throughout this document, the following variables
will be used to denote instances of the structures herein described:
.. code-block:: c
struct ap_matrix_dev *matrix_dev;
struct ap_matrix_mdev *matrix_mdev;
struct kvm *kvm;
The Matrix Devices Lock (drivers/s390/crypto/vfio_ap_private.h)
---------------------------------------------------------------
.. code-block:: c
struct ap_matrix_dev {
...
struct list_head mdev_list;
struct mutex mdevs_lock;
...
}
The Matrix Devices Lock (matrix_dev->mdevs_lock) is implemented as a global
mutex contained within the single object of struct ap_matrix_dev. This lock
controls access to all fields contained within each matrix_mdev
(matrix_dev->mdev_list). This lock must be held while reading from, writing to
or using the data from a field contained within a matrix_mdev instance
representing one of the vfio_ap device driver's mediated devices.
The KVM Lock (include/linux/kvm_host.h)
---------------------------------------
.. code-block:: c
struct kvm {
...
struct mutex lock;
...
}
The KVM Lock (kvm->lock) controls access to the state data for a KVM guest. This
lock must be held by the vfio_ap device driver while one or more AP adapters,
domains or control domains are being plugged into or unplugged from the guest.
The KVM pointer is stored in the in the matrix_mdev instance
(matrix_mdev->kvm = kvm) containing the state of the mediated device that has
been attached to the KVM guest.
The Guests Lock (drivers/s390/crypto/vfio_ap_private.h)
-----------------------------------------------------------
.. code-block:: c
struct ap_matrix_dev {
...
struct list_head mdev_list;
struct mutex guests_lock;
...
}
The Guests Lock (matrix_dev->guests_lock) controls access to the
matrix_mdev instances (matrix_dev->mdev_list) that represent mediated devices
that hold the state for the mediated devices that have been attached to a
KVM guest. This lock must be held:
1. To control access to the KVM pointer (matrix_mdev->kvm) while the vfio_ap
device driver is using it to plug/unplug AP devices passed through to the KVM
guest.
2. To add matrix_mdev instances to or remove them from matrix_dev->mdev_list.
This is necessary to ensure the proper locking order when the list is perused
to find an ap_matrix_mdev instance for the purpose of plugging/unplugging
AP devices passed through to a KVM guest.
For example, when a queue device is removed from the vfio_ap device driver,
if the adapter is passed through to a KVM guest, it will have to be
unplugged. In order to figure out whether the adapter is passed through,
the matrix_mdev object to which the queue is assigned will have to be
found. The KVM pointer (matrix_mdev->kvm) can then be used to determine if
the mediated device is passed through (matrix_mdev->kvm != NULL) and if so,
to unplug the adapter.
It is not necessary to take the Guests Lock to access the KVM pointer if the
pointer is not used to plug/unplug devices passed through to the KVM guest;
however, in this case, the Matrix Devices Lock (matrix_dev->mdevs_lock) must be
held in order to access the KVM pointer since it is set and cleared under the
protection of the Matrix Devices Lock. A case in point is the function that
handles interception of the PQAP(AQIC) instruction sub-function. This handler
needs to access the KVM pointer only for the purposes of setting or clearing IRQ
resources, so only the matrix_dev->mdevs_lock needs to be held.
The PQAP Hook Lock (arch/s390/include/asm/kvm_host.h)
-----------------------------------------------------
.. code-block:: c
typedef int (*crypto_hook)(struct kvm_vcpu *vcpu);
struct kvm_s390_crypto {
...
struct rw_semaphore pqap_hook_rwsem;
crypto_hook *pqap_hook;
...
};
The PQAP Hook Lock is a r/w semaphore that controls access to the function
pointer of the handler ``(*kvm->arch.crypto.pqap_hook)`` to invoke when the
PQAP(AQIC) instruction sub-function is intercepted by the host. The lock must be
held in write mode when pqap_hook value is set, and in read mode when the
pqap_hook function is called.

500
Documentation/s390/vfio-ap.rst
View File

@ -123,27 +123,24 @@ Let's now take a look at how AP instructions executed on a guest are interpreted
by the hardware.
A satellite control block called the Crypto Control Block (CRYCB) is attached to
our main hardware virtualization control block. The CRYCB contains three fields
to identify the adapters, usage domains and control domains assigned to the KVM
guest:
our main hardware virtualization control block. The CRYCB contains an AP Control
Block (APCB) that has three fields to identify the adapters, usage domains and
control domains assigned to the KVM guest:
* The AP Mask (APM) field is a bit mask that identifies the AP adapters assigned
to the KVM guest. Each bit in the mask, from left to right (i.e. from most
significant to least significant bit in big endian order), corresponds to
to the KVM guest. Each bit in the mask, from left to right, corresponds to
an APID from 0-255. If a bit is set, the corresponding adapter is valid for
use by the KVM guest.
* The AP Queue Mask (AQM) field is a bit mask identifying the AP usage domains
assigned to the KVM guest. Each bit in the mask, from left to right (i.e. from
most significant to least significant bit in big endian order), corresponds to
an AP queue index (APQI) from 0-255. If a bit is set, the corresponding queue
is valid for use by the KVM guest.
assigned to the KVM guest. Each bit in the mask, from left to right,
corresponds to an AP queue index (APQI) from 0-255. If a bit is set, the
corresponding queue is valid for use by the KVM guest.
* The AP Domain Mask field is a bit mask that identifies the AP control domains
assigned to the KVM guest. The ADM bit mask controls which domains can be
changed by an AP command-request message sent to a usage domain from the
guest. Each bit in the mask, from left to right (i.e. from most significant to
least significant bit in big endian order), corresponds to a domain from
guest. Each bit in the mask, from left to right, corresponds to a domain from
0-255. If a bit is set, the corresponding domain can be modified by an AP
command-request message sent to a usage domain.
@ -151,10 +148,10 @@ If you recall from the description of an AP Queue, AP instructions include
an APQN to identify the AP queue to which an AP command-request message is to be
sent (NQAP and PQAP instructions), or from which a command-reply message is to
be received (DQAP instruction). The validity of an APQN is defined by the matrix
calculated from the APM and AQM; it is the cross product of all assigned adapter
numbers (APM) with all assigned queue indexes (AQM). For example, if adapters 1
and 2 and usage domains 5 and 6 are assigned to a guest, the APQNs (1,5), (1,6),
(2,5) and (2,6) will be valid for the guest.
calculated from the APM and AQM; it is the Cartesian product of all assigned
adapter numbers (APM) with all assigned queue indexes (AQM). For example, if
adapters 1 and 2 and usage domains 5 and 6 are assigned to a guest, the APQNs
(1,5), (1,6), (2,5) and (2,6) will be valid for the guest.
The APQNs can provide secure key functionality - i.e., a private key is stored
on the adapter card for each of its domains - so each APQN must be assigned to
@ -192,7 +189,7 @@ The design introduces three new objects:
1. AP matrix device
2. VFIO AP device driver (vfio_ap.ko)
3. VFIO AP mediated matrix pass-through device
3. VFIO AP mediated pass-through device
The VFIO AP device driver
-------------------------
@ -200,12 +197,13 @@ The VFIO AP (vfio_ap) device driver serves the following purposes:
1. Provides the interfaces to secure APQNs for exclusive use of KVM guests.
2. Sets up the VFIO mediated device interfaces to manage a mediated matrix
2. Sets up the VFIO mediated device interfaces to manage a vfio_ap mediated
device and creates the sysfs interfaces for assigning adapters, usage
domains, and control domains comprising the matrix for a KVM guest.
3. Configures the APM, AQM and ADM in the CRYCB referenced by a KVM guest's
SIE state description to grant the guest access to a matrix of AP devices
3. Configures the APM, AQM and ADM in the APCB contained in the CRYCB referenced
by a KVM guest's SIE state description to grant the guest access to a matrix
of AP devices
Reserve APQNs for exclusive use of KVM guests
---------------------------------------------
@ -235,10 +233,10 @@ reserved::
| | 8 probe | |
+--------^---------+ +--^--^------------+
6 edit | | |
apmask | +-----------------------------+ | 9 mdev create
apmask | +-----------------------------+ | 11 mdev create
aqmask | | 1 modprobe |
+--------+-----+---+ +----------------+-+ +----------------+
| | | |8 create | mediated |
| | | |10 create| mediated |
| admin | | VFIO device core |---------> matrix |
| + | | | device |
+------+-+---------+ +--------^---------+ +--------^-------+
@ -246,14 +244,14 @@ reserved::
| | 9 create vfio_ap-passthrough | |
| +------------------------------+ |
+-------------------------------------------------------------+
10 assign adapter/domain/control domain
12 assign adapter/domain/control domain
The process for reserving an AP queue for use by a KVM guest is:
1. The administrator loads the vfio_ap device driver
2. The vfio-ap driver during its initialization will register a single 'matrix'
device with the device core. This will serve as the parent device for
all mediated matrix devices used to configure an AP matrix for a guest.
all vfio_ap mediated devices used to configure an AP matrix for a guest.
3. The /sys/devices/vfio_ap/matrix device is created by the device core
4. The vfio_ap device driver will register with the AP bus for AP queue devices
of type 10 and higher (CEX4 and newer). The driver will provide the vfio_ap
@ -269,24 +267,24 @@ The process for reserving an AP queue for use by a KVM guest is:
default zcrypt cex4queue driver.
8. The AP bus probes the vfio_ap device driver to bind the queues reserved for
it.
9. The administrator creates a passthrough type mediated matrix device to be
9. The administrator creates a passthrough type vfio_ap mediated device to be
used by a guest
10. The administrator assigns the adapters, usage domains and control domains
to be exclusively used by a guest.
Set up the VFIO mediated device interfaces
------------------------------------------
The VFIO AP device driver utilizes the common interface of the VFIO mediated
The VFIO AP device driver utilizes the common interfaces of the VFIO mediated
device core driver to:
* Register an AP mediated bus driver to add a mediated matrix device to and
* Register an AP mediated bus driver to add a vfio_ap mediated device to and
remove it from a VFIO group.
* Create and destroy a mediated matrix device
* Add a mediated matrix device to and remove it from the AP mediated bus driver
* Add a mediated matrix device to and remove it from an IOMMU group
* Create and destroy a vfio_ap mediated device
* Add a vfio_ap mediated device to and remove it from the AP mediated bus driver
* Add a vfio_ap mediated device to and remove it from an IOMMU group
The following high-level block diagram shows the main components and interfaces
of the VFIO AP mediated matrix device driver::
of the VFIO AP mediated device driver::
+-------------+
| |
@ -343,7 +341,7 @@ matrix device.
* device_api:
the mediated device type's API
* available_instances:
the number of mediated matrix passthrough devices
the number of vfio_ap mediated passthrough devices
that can be created
* device_api:
specifies the VFIO API
@ -351,29 +349,37 @@ matrix device.
This attribute group identifies the user-defined sysfs attributes of the
mediated device. When a device is registered with the VFIO mediated device
framework, the sysfs attribute files identified in the 'mdev_attr_groups'
structure will be created in the mediated matrix device's directory. The
sysfs attributes for a mediated matrix device are:
structure will be created in the vfio_ap mediated device's directory. The
sysfs attributes for a vfio_ap mediated device are:
assign_adapter / unassign_adapter:
Write-only attributes for assigning/unassigning an AP adapter to/from the
mediated matrix device. To assign/unassign an adapter, the APID of the
adapter is echoed to the respective attribute file.
vfio_ap mediated device. To assign/unassign an adapter, the APID of the
adapter is echoed into the respective attribute file.
assign_domain / unassign_domain:
Write-only attributes for assigning/unassigning an AP usage domain to/from
the mediated matrix device. To assign/unassign a domain, the domain
number of the usage domain is echoed to the respective attribute
the vfio_ap mediated device. To assign/unassign a domain, the domain
number of the usage domain is echoed into the respective attribute
file.
matrix:
A read-only file for displaying the APQNs derived from the cross product
of the adapter and domain numbers assigned to the mediated matrix device.
A read-only file for displaying the APQNs derived from the Cartesian
product of the adapter and domain numbers assigned to the vfio_ap mediated
device.
guest_matrix:
A read-only file for displaying the APQNs derived from the Cartesian
product of the adapter and domain numbers assigned to the APM and AQM
fields respectively of the KVM guest's CRYCB. This may differ from the
the APQNs assigned to the vfio_ap mediated device if any APQN does not
reference a queue device bound to the vfio_ap device driver (i.e., the
queue is not in the host's AP configuration).
assign_control_domain / unassign_control_domain:
Write-only attributes for assigning/unassigning an AP control domain
to/from the mediated matrix device. To assign/unassign a control domain,
the ID of the domain to be assigned/unassigned is echoed to the respective
attribute file.
to/from the vfio_ap mediated device. To assign/unassign a control domain,
the ID of the domain to be assigned/unassigned is echoed into the
respective attribute file.
control_domains:
A read-only file for displaying the control domain numbers assigned to the
mediated matrix device.
vfio_ap mediated device.
* functions:
@ -383,45 +389,75 @@ matrix device.
* Store the reference to the KVM structure for the guest using the mdev
* Store the AP matrix configuration for the adapters, domains, and control
domains assigned via the corresponding sysfs attributes files
* Store the AP matrix configuration for the adapters, domains and control
domains available to a guest. A guest may not be provided access to APQNs
referencing queue devices that do not exist, or are not bound to the
vfio_ap device driver.
remove:
deallocates the mediated matrix device's ap_matrix_mdev structure. This will
be allowed only if a running guest is not using the mdev.
deallocates the vfio_ap mediated device's ap_matrix_mdev structure.
This will be allowed only if a running guest is not using the mdev.
* callback interfaces
open:
open_device:
The vfio_ap driver uses this callback to register a
VFIO_GROUP_NOTIFY_SET_KVM notifier callback function for the mdev matrix
device. The open is invoked when QEMU connects the VFIO iommu group
for the mdev matrix device to the MDEV bus. Access to the KVM structure used
to configure the KVM guest is provided via this callback. The KVM structure,
is used to configure the guest's access to the AP matrix defined via the
mediated matrix device's sysfs attribute files.
release:
unregisters the VFIO_GROUP_NOTIFY_SET_KVM notifier callback function for the
mdev matrix device and deconfigures the guest's AP matrix.
VFIO_GROUP_NOTIFY_SET_KVM notifier callback function for the matrix mdev
devices. The open_device callback is invoked by userspace to connect the
VFIO iommu group for the matrix mdev device to the MDEV bus. Access to the
KVM structure used to configure the KVM guest is provided via this callback.
The KVM structure, is used to configure the guest's access to the AP matrix
defined via the vfio_ap mediated device's sysfs attribute files.
Configure the APM, AQM and ADM in the CRYCB
-------------------------------------------
Configuring the AP matrix for a KVM guest will be performed when the
close_device:
unregisters the VFIO_GROUP_NOTIFY_SET_KVM notifier callback function for the
matrix mdev device and deconfigures the guest's AP matrix.
ioctl:
this callback handles the VFIO_DEVICE_GET_INFO and VFIO_DEVICE_RESET ioctls
defined by the vfio framework.
Configure the guest's AP resources
----------------------------------
Configuring the AP resources for a KVM guest will be performed when the
VFIO_GROUP_NOTIFY_SET_KVM notifier callback is invoked. The notifier
function is called when QEMU connects to KVM. The guest's AP matrix is
configured via it's CRYCB by:
function is called when userspace connects to KVM. The guest's AP resources are
configured via it's APCB by:
* Setting the bits in the APM corresponding to the APIDs assigned to the
mediated matrix device via its 'assign_adapter' interface.
vfio_ap mediated device via its 'assign_adapter' interface.
* Setting the bits in the AQM corresponding to the domains assigned to the
mediated matrix device via its 'assign_domain' interface.
vfio_ap mediated device via its 'assign_domain' interface.
* Setting the bits in the ADM corresponding to the domain dIDs assigned to the
mediated matrix device via its 'assign_control_domains' interface.
vfio_ap mediated device via its 'assign_control_domains' interface.
The linux device model precludes passing a device through to a KVM guest that
is not bound to the device driver facilitating its pass-through. Consequently,
an APQN that does not reference a queue device bound to the vfio_ap device
driver will not be assigned to a KVM guest's matrix. The AP architecture,
however, does not provide a means to filter individual APQNs from the guest's
matrix, so the adapters, domains and control domains assigned to vfio_ap
mediated device via its sysfs 'assign_adapter', 'assign_domain' and
'assign_control_domain' interfaces will be filtered before providing the AP
configuration to a guest:
* The APIDs of the adapters, the APQIs of the domains and the domain numbers of
the control domains assigned to the matrix mdev that are not also assigned to
the host's AP configuration will be filtered.
* Each APQN derived from the Cartesian product of the APIDs and APQIs assigned
to the vfio_ap mdev is examined and if any one of them does not reference a
queue device bound to the vfio_ap device driver, the adapter will not be
plugged into the guest (i.e., the bit corresponding to its APID will not be
set in the APM of the guest's APCB).
The CPU model features for AP
-----------------------------
The AP stack relies on the presence of the AP instructions as well as two
facilities: The AP Facilities Test (APFT) facility; and the AP Query
Configuration Information (QCI) facility. These features/facilities are made
available to a KVM guest via the following CPU model features:
The AP stack relies on the presence of the AP instructions as well as three
facilities: The AP Facilities Test (APFT) facility; the AP Query
Configuration Information (QCI) facility; and the AP Queue Interruption Control
facility. These features/facilities are made available to a KVM guest via the
following CPU model features:
1. ap: Indicates whether the AP instructions are installed on the guest. This
feature will be enabled by KVM only if the AP instructions are installed
@ -435,24 +471,28 @@ available to a KVM guest via the following CPU model features:
can be made available to the guest only if it is available on the host (i.e.,
facility bit 12 is set).
4. apqi: Indicates AP Queue Interruption Control faclity is available on the
guest. This facility can be made available to the guest only if it is
available on the host (i.e., facility bit 65 is set).
Note: If the user chooses to specify a CPU model different than the 'host'
model to QEMU, the CPU model features and facilities need to be turned on
explicitly; for example::
/usr/bin/qemu-system-s390x ... -cpu z13,ap=on,apqci=on,apft=on
/usr/bin/qemu-system-s390x ... -cpu z13,ap=on,apqci=on,apft=on,apqi=on
A guest can be precluded from using AP features/facilities by turning them off
explicitly; for example::
/usr/bin/qemu-system-s390x ... -cpu host,ap=off,apqci=off,apft=off
/usr/bin/qemu-system-s390x ... -cpu host,ap=off,apqci=off,apft=off,apqi=off
Note: If the APFT facility is turned off (apft=off) for the guest, the guest
will not see any AP devices. The zcrypt device drivers that register for type 10
and newer AP devices - i.e., the cex4card and cex4queue device drivers - need
the APFT facility to ascertain the facilities installed on a given AP device. If
the APFT facility is not installed on the guest, then the probe of device
drivers will fail since only type 10 and newer devices can be configured for
guest use.
will not see any AP devices. The zcrypt device drivers on the guest that
register for type 10 and newer AP devices - i.e., the cex4card and cex4queue
device drivers - need the APFT facility to ascertain the facilities installed on
a given AP device. If the APFT facility is not installed on the guest, then no
adapter or domain devices will get created by the AP bus running on the
guest because only type 10 and newer devices can be configured for guest use.
Example
=======
@ -471,7 +511,7 @@ CARD.DOMAIN TYPE MODE
05.00ab CEX5C CCA-Coproc
06 CEX5A Accelerator
06.0004 CEX5A Accelerator
06.00ab CEX5C CCA-Coproc
06.00ab CEX5A Accelerator
=========== ===== ============
Guest2
@ -479,9 +519,9 @@ Guest2
=========== ===== ============
CARD.DOMAIN TYPE MODE
=========== ===== ============
05 CEX5A Accelerator
05.0047 CEX5A Accelerator
05.00ff CEX5A Accelerator
05 CEX5C CCA-Coproc
05.0047 CEX5C CCA-Coproc
05.00ff CEX5C CCA-Coproc
=========== ===== ============
Guest3
@ -529,40 +569,56 @@ These are the steps:
2. Secure the AP queues to be used by the three guests so that the host can not
access them. To secure them, there are two sysfs files that specify
bitmasks marking a subset of the APQN range as 'usable by the default AP
queue device drivers' or 'not usable by the default device drivers' and thus
available for use by the vfio_ap device driver'. The location of the sysfs
files containing the masks are::
bitmasks marking a subset of the APQN range as usable only by the default AP
queue device drivers. All remaining APQNs are available for use by
any other device driver. The vfio_ap device driver is currently the only
non-default device driver. The location of the sysfs files containing the
masks are::
/sys/bus/ap/apmask
/sys/bus/ap/aqmask
The 'apmask' is a 256-bit mask that identifies a set of AP adapter IDs
(APID). Each bit in the mask, from left to right (i.e., from most significant
to least significant bit in big endian order), corresponds to an APID from
0-255. If a bit is set, the APID is marked as usable only by the default AP
queue device drivers; otherwise, the APID is usable by the vfio_ap
device driver.
(APID). Each bit in the mask, from left to right, corresponds to an APID from
0-255. If a bit is set, the APID belongs to the subset of APQNs marked as
available only to the default AP queue device drivers.
The 'aqmask' is a 256-bit mask that identifies a set of AP queue indexes
(APQI). Each bit in the mask, from left to right (i.e., from most significant
to least significant bit in big endian order), corresponds to an APQI from
0-255. If a bit is set, the APQI is marked as usable only by the default AP
queue device drivers; otherwise, the APQI is usable by the vfio_ap device
driver.
(APQI). Each bit in the mask, from left to right, corresponds to an APQI from
0-255. If a bit is set, the APQI belongs to the subset of APQNs marked as
available only to the default AP queue device drivers.
Take, for example, the following mask::
The Cartesian product of the APIDs corresponding to the bits set in the
apmask and the APQIs corresponding to the bits set in the aqmask comprise
the subset of APQNs that can be used only by the host default device drivers.
All other APQNs are available to the non-default device drivers such as the
vfio_ap driver.
0x7dffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
Take, for example, the following masks::
It indicates:
apmask:
0x7d00000000000000000000000000000000000000000000000000000000000000
1, 2, 3, 4, 5, and 7-255 belong to the default drivers' pool, and 0 and 6
belong to the vfio_ap device driver's pool.
aqmask:
0x8000000000000000000000000000000000000000000000000000000000000000
The masks indicate:
* Adapters 1, 2, 3, 4, 5, and 7 are available for use by the host default
device drivers.
* Domain 0 is available for use by the host default device drivers
* The subset of APQNs available for use only by the default host device
drivers are:
(1,0), (2,0), (3,0), (4.0), (5,0) and (7,0)
* All other APQNs are available for use by the non-default device drivers.
The APQN of each AP queue device assigned to the linux host is checked by the
AP bus against the set of APQNs derived from the cross product of APIDs
and APQIs marked as usable only by the default AP queue device drivers. If a
AP bus against the set of APQNs derived from the Cartesian product of APIDs
and APQIs marked as available to the default AP queue device drivers. If a
match is detected, only the default AP queue device drivers will be probed;
otherwise, the vfio_ap device driver will be probed.
@ -579,8 +635,7 @@ These are the steps:
0x4100000000000000000000000000000000000000000000000000000000000000
Keep in mind that the mask reads from left to right (i.e., most
significant to least significant bit in big endian order), so the mask
Keep in mind that the mask reads from left to right, so the mask
above identifies device numbers 1 and 7 (01000001).
If the string is longer than the mask, the operation is terminated with
@ -626,11 +681,22 @@ These are the steps:
default drivers pool: adapter 0-15, domain 1
alternate drivers pool: adapter 16-255, domains 0, 2-255
**Note:**
Changing a mask such that one or more APQNs will be taken from a vfio_ap
mediated device (see below) will fail with an error (EBUSY). A message
is logged to the kernel ring buffer which can be viewed with the 'dmesg'
command. The output identifies each APQN flagged as 'in use' and identifies
the vfio_ap mediated device to which it is assigned; for example:
Userspace may not re-assign queue 05.0054 already assigned to 62177883-f1bb-47f0-914d-32a22e3a8804
Userspace may not re-assign queue 04.0054 already assigned to cef03c3c-903d-4ecc-9a83-40694cb8aee4
Securing the APQNs for our example
----------------------------------
To secure the AP queues 05.0004, 05.0047, 05.00ab, 05.00ff, 06.0004, 06.0047,
06.00ab, and 06.00ff for use by the vfio_ap device driver, the corresponding
APQNs can either be removed from the default masks::
APQNs can be removed from the default masks using either of the following
commands::
echo -5,-6 > /sys/bus/ap/apmask
@ -683,7 +749,7 @@ Securing the APQNs for our example
/sys/devices/vfio_ap/matrix/
--- [mdev_supported_types]
------ [vfio_ap-passthrough] (passthrough mediated matrix device type)
------ [vfio_ap-passthrough] (passthrough vfio_ap mediated device type)
--------- create
--------- [devices]
@ -734,6 +800,9 @@ Securing the APQNs for our example
----------------unassign_control_domain
----------------unassign_domain
Note *****: The vfio_ap mdevs do not persist across reboots unless the
mdevctl tool is used to create and persist them.
4. The administrator now needs to configure the matrixes for the mediated
devices $uuid1 (for Guest1), $uuid2 (for Guest2) and $uuid3 (for Guest3).
@ -755,6 +824,10 @@ Securing the APQNs for our example
cat matrix
To display the matrix that is or will be assigned to Guest1::
cat guest_matrix
This is how the matrix is configured for Guest2::
echo 5 > assign_adapter
@ -774,17 +847,24 @@ Securing the APQNs for our example
higher than the maximum is specified, the operation will terminate with
an error (ENODEV).
* All APQNs that can be derived from the adapter ID and the IDs of
the previously assigned domains must be bound to the vfio_ap device
driver. If no domains have yet been assigned, then there must be at least
one APQN with the specified APID bound to the vfio_ap driver. If no such
APQNs are bound to the driver, the operation will terminate with an
error (EADDRNOTAVAIL).
Note: The maximum adapter number can be obtained via the sysfs
/sys/bus/ap/ap_max_adapter_id attribute file.
No APQN that can be derived from the adapter ID and the IDs of the
previously assigned domains can be assigned to another mediated matrix
device. If an APQN is assigned to another mediated matrix device, the
operation will terminate with an error (EADDRINUSE).
* Each APQN derived from the Cartesian product of the APID of the adapter
being assigned and the APQIs of the domains previously assigned:
- Must only be available to the vfio_ap device driver as specified in the
sysfs /sys/bus/ap/apmask and /sys/bus/ap/aqmask attribute files. If even
one APQN is reserved for use by the host device driver, the operation
will terminate with an error (EADDRNOTAVAIL).
- Must NOT be assigned to another vfio_ap mediated device. If even one APQN
is assigned to another vfio_ap mediated device, the operation will
terminate with an error (EBUSY).
- Must NOT be assigned while the sysfs /sys/bus/ap/apmask and
sys/bus/ap/aqmask attribute files are being edited or the operation may
terminate with an error (EBUSY).
In order to successfully assign a domain:
@ -793,41 +873,50 @@ Securing the APQNs for our example
higher than the maximum is specified, the operation will terminate with
an error (ENODEV).
* All APQNs that can be derived from the domain ID and the IDs of
the previously assigned adapters must be bound to the vfio_ap device
driver. If no domains have yet been assigned, then there must be at least
one APQN with the specified APQI bound to the vfio_ap driver. If no such
APQNs are bound to the driver, the operation will terminate with an
error (EADDRNOTAVAIL).
Note: The maximum domain number can be obtained via the sysfs
/sys/bus/ap/ap_max_domain_id attribute file.
No APQN that can be derived from the domain ID and the IDs of the
previously assigned adapters can be assigned to another mediated matrix
device. If an APQN is assigned to another mediated matrix device, the
operation will terminate with an error (EADDRINUSE).
* Each APQN derived from the Cartesian product of the APQI of the domain
being assigned and the APIDs of the adapters previously assigned:
In order to successfully assign a control domain, the domain number
specified must represent a value from 0 up to the maximum domain number
configured for the system. If a control domain number higher than the maximum
is specified, the operation will terminate with an error (ENODEV).
- Must only be available to the vfio_ap device driver as specified in the
sysfs /sys/bus/ap/apmask and /sys/bus/ap/aqmask attribute files. If even
one APQN is reserved for use by the host device driver, the operation
will terminate with an error (EADDRNOTAVAIL).
- Must NOT be assigned to another vfio_ap mediated device. If even one APQN
is assigned to another vfio_ap mediated device, the operation will
terminate with an error (EBUSY).
- Must NOT be assigned while the sysfs /sys/bus/ap/apmask and
sys/bus/ap/aqmask attribute files are being edited or the operation may
terminate with an error (EBUSY).
In order to successfully assign a control domain:
* The domain number specified must represent a value from 0 up to the maximum
domain number configured for the system. If a control domain number higher
than the maximum is specified, the operation will terminate with an
error (ENODEV).
5. Start Guest1::
/usr/bin/qemu-system-s390x ... -cpu host,ap=on,apqci=on,apft=on \
/usr/bin/qemu-system-s390x ... -cpu host,ap=on,apqci=on,apft=on,apqi=on \
-device vfio-ap,sysfsdev=/sys/devices/vfio_ap/matrix/$uuid1 ...
7. Start Guest2::
/usr/bin/qemu-system-s390x ... -cpu host,ap=on,apqci=on,apft=on \
/usr/bin/qemu-system-s390x ... -cpu host,ap=on,apqci=on,apft=on,apqi=on \
-device vfio-ap,sysfsdev=/sys/devices/vfio_ap/matrix/$uuid2 ...
7. Start Guest3::
/usr/bin/qemu-system-s390x ... -cpu host,ap=on,apqci=on,apft=on \
/usr/bin/qemu-system-s390x ... -cpu host,ap=on,apqci=on,apft=on,apqi=on \
-device vfio-ap,sysfsdev=/sys/devices/vfio_ap/matrix/$uuid3 ...
When the guest is shut down, the mediated matrix devices may be removed.
When the guest is shut down, the vfio_ap mediated devices may be removed.
Using our example again, to remove the mediated matrix device $uuid1::
Using our example again, to remove the vfio_ap mediated device $uuid1::
/sys/devices/vfio_ap/matrix/
--- [mdev_supported_types]
@ -840,26 +929,143 @@ Using our example again, to remove the mediated matrix device $uuid1::
echo 1 > remove
This will remove all of the mdev matrix device's sysfs structures including
the mdev device itself. To recreate and reconfigure the mdev matrix device,
This will remove all of the matrix mdev device's sysfs structures including
the mdev device itself. To recreate and reconfigure the matrix mdev device,
all of the steps starting with step 3 will have to be performed again. Note
that the remove will fail if a guest using the mdev is still running.
that the remove will fail if a guest using the vfio_ap mdev is still running.
It is not necessary to remove an mdev matrix device, but one may want to
It is not necessary to remove a vfio_ap mdev, but one may want to
remove it if no guest will use it during the remaining lifetime of the linux
host. If the mdev matrix device is removed, one may want to also reconfigure
host. If the vfio_ap mdev is removed, one may want to also reconfigure
the pool of adapters and queues reserved for use by the default drivers.
Hot plug/unplug support:
========================
An adapter, domain or control domain may be hot plugged into a running KVM
guest by assigning it to the vfio_ap mediated device being used by the guest if
the following conditions are met:
* The adapter, domain or control domain must also be assigned to the host's
AP configuration.
* Each APQN derived from the Cartesian product comprised of the APID of the
adapter being assigned and the APQIs of the domains assigned must reference a
queue device bound to the vfio_ap device driver.
* To hot plug a domain, each APQN derived from the Cartesian product
comprised of the APQI of the domain being assigned and the APIDs of the
adapters assigned must reference a queue device bound to the vfio_ap device
driver.
An adapter, domain or control domain may be hot unplugged from a running KVM
guest by unassigning it from the vfio_ap mediated device being used by the
guest.
Over-provisioning of AP queues for a KVM guest:
===============================================
Over-provisioning is defined herein as the assignment of adapters or domains to
a vfio_ap mediated device that do not reference AP devices in the host's AP
configuration. The idea here is that when the adapter or domain becomes
available, it will be automatically hot-plugged into the KVM guest using
the vfio_ap mediated device to which it is assigned as long as each new APQN
resulting from plugging it in references a queue device bound to the vfio_ap
device driver.
Limitations
===========
* The KVM/kernel interfaces do not provide a way to prevent restoring an APQN
to the default drivers pool of a queue that is still assigned to a mediated
device in use by a guest. It is incumbent upon the administrator to
ensure there is no mediated device in use by a guest to which the APQN is
assigned lest the host be given access to the private data of the AP queue
device such as a private key configured specifically for the guest.
Live guest migration is not supported for guests using AP devices without
intervention by a system administrator. Before a KVM guest can be migrated,
the vfio_ap mediated device must be removed. Unfortunately, it can not be
removed manually (i.e., echo 1 > /sys/devices/vfio_ap/matrix/$UUID/remove) while
the mdev is in use by a KVM guest. If the guest is being emulated by QEMU,
its mdev can be hot unplugged from the guest in one of two ways:
* Dynamically modifying the AP matrix for a running guest (which would amount to
hot(un)plug of AP devices for the guest) is currently not supported
1. If the KVM guest was started with libvirt, you can hot unplug the mdev via
the following commands:
* Live guest migration is not supported for guests using AP devices.
virsh detach-device <guestname> <path-to-device-xml>
For example, to hot unplug mdev 62177883-f1bb-47f0-914d-32a22e3a8804 from
the guest named 'my-guest':
virsh detach-device my-guest ~/config/my-guest-hostdev.xml
The contents of my-guest-hostdev.xml:
.. code-block:: xml
<hostdev mode='subsystem' type='mdev' managed='no' model='vfio-ap'>
<source>
<address uuid='62177883-f1bb-47f0-914d-32a22e3a8804'/>
</source>
</hostdev>
virsh qemu-monitor-command <guest-name> --hmp "device-del <device-id>"
For example, to hot unplug the vfio_ap mediated device identified on the
qemu command line with 'id=hostdev0' from the guest named 'my-guest':
.. code-block:: sh
virsh qemu-monitor-command my-guest --hmp "device_del hostdev0"
2. A vfio_ap mediated device can be hot unplugged by attaching the qemu monitor
to the guest and using the following qemu monitor command:
(QEMU) device-del id=<device-id>
For example, to hot unplug the vfio_ap mediated device that was specified
on the qemu command line with 'id=hostdev0' when the guest was started:
(QEMU) device-del id=hostdev0
After live migration of the KVM guest completes, an AP configuration can be
restored to the KVM guest by hot plugging a vfio_ap mediated device on the target
system into the guest in one of two ways:
1. If the KVM guest was started with libvirt, you can hot plug a matrix mediated
device into the guest via the following virsh commands:
virsh attach-device <guestname> <path-to-device-xml>
For example, to hot plug mdev 62177883-f1bb-47f0-914d-32a22e3a8804 into
the guest named 'my-guest':
virsh attach-device my-guest ~/config/my-guest-hostdev.xml
The contents of my-guest-hostdev.xml:
.. code-block:: xml
<hostdev mode='subsystem' type='mdev' managed='no' model='vfio-ap'>
<source>
<address uuid='62177883-f1bb-47f0-914d-32a22e3a8804'/>
</source>
</hostdev>
virsh qemu-monitor-command <guest-name> --hmp \
"device_add vfio-ap,sysfsdev=<path-to-mdev>,id=<device-id>"
For example, to hot plug the vfio_ap mediated device
62177883-f1bb-47f0-914d-32a22e3a8804 into the guest named 'my-guest' with
device-id hostdev0:
virsh qemu-monitor-command my-guest --hmp \
"device_add vfio-ap,\
sysfsdev=/sys/devices/vfio_ap/matrix/62177883-f1bb-47f0-914d-32a22e3a8804,\
id=hostdev0"
2. A vfio_ap mediated device can be hot plugged by attaching the qemu monitor
to the guest and using the following qemu monitor command:
(qemu) device_add "vfio-ap,sysfsdev=<path-to-mdev>,id=<device-id>"
For example, to plug the vfio_ap mediated device
62177883-f1bb-47f0-914d-32a22e3a8804 into the guest with the device-id
hostdev0:
(QEMU) device-add "vfio-ap,\
sysfsdev=/sys/devices/vfio_ap/matrix/62177883-f1bb-47f0-914d-32a22e3a8804,\
id=hostdev0"

2
MAINTAINERS
View File

@ -17808,7 +17808,7 @@ M: Jason Herne <jjherne@linux.ibm.com>
L: linux-s390@vger.kernel.org
S: Supported
W: http://www.ibm.com/developerworks/linux/linux390/
F: Documentation/s390/vfio-ap.rst
F: Documentation/s390/vfio-ap*
F: drivers/s390/crypto/vfio_ap*
S390 VFIO-CCW DRIVER

10
arch/s390/boot/startup.c
View File

@ -152,6 +152,7 @@ static void setup_kernel_memory_layout(void)
unsigned long vmemmap_start;
unsigned long rte_size;
unsigned long pages;
unsigned long vmax;
pages = ident_map_size / PAGE_SIZE;
/* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
@ -163,10 +164,10 @@ static void setup_kernel_memory_layout(void)
vmalloc_size > _REGION2_SIZE ||
vmemmap_start + vmemmap_size + vmalloc_size + MODULES_LEN >
_REGION2_SIZE) {
MODULES_END = _REGION1_SIZE;
vmax = _REGION1_SIZE;
rte_size = _REGION2_SIZE;
} else {
MODULES_END = _REGION2_SIZE;
vmax = _REGION2_SIZE;
rte_size = _REGION3_SIZE;
}
/*
@ -174,11 +175,12 @@ static void setup_kernel_memory_layout(void)
* secure storage limit, so that any vmalloc allocation
* we do could be used to back secure guest storage.
*/
adjust_to_uv_max(&MODULES_END);
vmax = adjust_to_uv_max(vmax);
#ifdef CONFIG_KASAN
/* force vmalloc and modules below kasan shadow */
MODULES_END = min(MODULES_END, KASAN_SHADOW_START);
vmax = min(vmax, KASAN_SHADOW_START);
#endif
MODULES_END = vmax;
MODULES_VADDR = MODULES_END - MODULES_LEN;
VMALLOC_END = MODULES_VADDR;

5
arch/s390/boot/uv.c
View File

@ -57,10 +57,11 @@ void uv_query_info(void)
}
#if IS_ENABLED(CONFIG_KVM)
void adjust_to_uv_max(unsigned long *vmax)
unsigned long adjust_to_uv_max(unsigned long limit)
{
if (is_prot_virt_host() && uv_info.max_sec_stor_addr)
*vmax = min_t(unsigned long, *vmax, uv_info.max_sec_stor_addr);
limit = min_t(unsigned long, limit, uv_info.max_sec_stor_addr);
return limit;
}
static int is_prot_virt_host_capable(void)

7
arch/s390/boot/uv.h
View File

@ -3,10 +3,13 @@
#define BOOT_UV_H
#if IS_ENABLED(CONFIG_KVM)
void adjust_to_uv_max(unsigned long *vmax);
unsigned long adjust_to_uv_max(unsigned long limit);
void sanitize_prot_virt_host(void);
#else
static inline void adjust_to_uv_max(unsigned long *vmax) {}
static inline unsigned long adjust_to_uv_max(unsigned long limit)
{
return limit;
}
static inline void sanitize_prot_virt_host(void) {}
#endif

2
arch/s390/crypto/aes_s390.c
View File

@ -1049,7 +1049,7 @@ out_err:
return ret;
}
module_cpu_feature_match(MSA, aes_s390_init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, aes_s390_init);
module_exit(aes_s390_fini);
MODULE_ALIAS_CRYPTO("aes-all");

2
arch/s390/crypto/chacha-glue.c
View File

@ -121,7 +121,7 @@ static void __exit chacha_mod_fini(void)
crypto_unregister_skciphers(chacha_algs, ARRAY_SIZE(chacha_algs));
}
module_cpu_feature_match(VXRS, chacha_mod_init);
module_cpu_feature_match(S390_CPU_FEATURE_VXRS, chacha_mod_init);
module_exit(chacha_mod_fini);
MODULE_DESCRIPTION("ChaCha20 stream cipher");

2
arch/s390/crypto/crc32-vx.c
View File

@ -298,7 +298,7 @@ static void __exit crc_vx_mod_exit(void)
crypto_unregister_shashes(crc32_vx_algs, ARRAY_SIZE(crc32_vx_algs));
}
module_cpu_feature_match(VXRS, crc_vx_mod_init);
module_cpu_feature_match(S390_CPU_FEATURE_VXRS, crc_vx_mod_init);
module_exit(crc_vx_mod_exit);
MODULE_AUTHOR("Hendrik Brueckner <brueckner@linux.vnet.ibm.com>");

2
arch/s390/crypto/des_s390.c
View File

@ -492,7 +492,7 @@ out_err:
return ret;
}
module_cpu_feature_match(MSA, des_s390_init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, des_s390_init);
module_exit(des_s390_exit);
MODULE_ALIAS_CRYPTO("des");

2
arch/s390/crypto/ghash_s390.c
View File

@ -145,7 +145,7 @@ static void __exit ghash_mod_exit(void)
crypto_unregister_shash(&ghash_alg);
}
module_cpu_feature_match(MSA, ghash_mod_init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, ghash_mod_init);
module_exit(ghash_mod_exit);
MODULE_ALIAS_CRYPTO("ghash");

2
arch/s390/crypto/prng.c
View File

@ -907,5 +907,5 @@ static void __exit prng_exit(void)
}
}
module_cpu_feature_match(MSA, prng_init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, prng_init);
module_exit(prng_exit);

2
arch/s390/crypto/sha1_s390.c
View File

@ -95,7 +95,7 @@ static void __exit sha1_s390_fini(void)
crypto_unregister_shash(&alg);
}
module_cpu_feature_match(MSA, sha1_s390_init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha1_s390_init);
module_exit(sha1_s390_fini);
MODULE_ALIAS_CRYPTO("sha1");

2
arch/s390/crypto/sha256_s390.c
View File

@ -134,7 +134,7 @@ static void __exit sha256_s390_fini(void)
crypto_unregister_shash(&sha256_alg);
}
module_cpu_feature_match(MSA, sha256_s390_init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha256_s390_init);
module_exit(sha256_s390_fini);
MODULE_ALIAS_CRYPTO("sha256");

2
arch/s390/crypto/sha3_256_s390.c
View File

@ -137,7 +137,7 @@ static void __exit sha3_256_s390_fini(void)
crypto_unregister_shash(&sha3_256_alg);
}
module_cpu_feature_match(MSA, sha3_256_s390_init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha3_256_s390_init);
module_exit(sha3_256_s390_fini);
MODULE_ALIAS_CRYPTO("sha3-256");

2
arch/s390/crypto/sha3_512_s390.c
View File

@ -147,7 +147,7 @@ static void __exit fini(void)
crypto_unregister_shash(&sha3_384_alg);
}
module_cpu_feature_match(MSA, init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, init);
module_exit(fini);
MODULE_LICENSE("GPL");

2
arch/s390/crypto/sha512_s390.c
View File

@ -142,7 +142,7 @@ static void __exit fini(void)
crypto_unregister_shash(&sha384_alg);
}
module_cpu_feature_match(MSA, init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, init);
module_exit(fini);
MODULE_LICENSE("GPL");

23
arch/s390/include/asm/cpufeature.h
View File

@ -2,28 +2,21 @@
/*
* Module interface for CPU features
*
* Copyright IBM Corp. 2015
* Copyright IBM Corp. 2015, 2022
* Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
*/
#ifndef __ASM_S390_CPUFEATURE_H
#define __ASM_S390_CPUFEATURE_H
#include <asm/elf.h>
enum {
S390_CPU_FEATURE_MSA,
S390_CPU_FEATURE_VXRS,
S390_CPU_FEATURE_UV,
MAX_CPU_FEATURES
};
/* Hardware features on Linux on z Systems are indicated by facility bits that
* are mapped to the so-called machine flags. Particular machine flags are
* then used to define ELF hardware capabilities; most notably hardware flags
* that are essential for user space / glibc.
*
* Restrict the set of exposed CPU features to ELF hardware capabilities for
* now. Additional machine flags can be indicated by values larger than
* MAX_ELF_HWCAP_FEATURES.
*/
#define MAX_ELF_HWCAP_FEATURES (8 * sizeof(elf_hwcap))
#define MAX_CPU_FEATURES MAX_ELF_HWCAP_FEATURES
#define cpu_feature(feat) ilog2(HWCAP_ ## feat)
#define cpu_feature(feature) (feature)
int cpu_have_feature(unsigned int nr);

14
arch/s390/include/asm/mmu.h
View File

@ -42,18 +42,4 @@ typedef struct {
.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
static inline int tprot(unsigned long addr)
{
int rc = -EFAULT;
asm volatile(
" tprot 0(%1),0\n"
"0: ipm %0\n"
" srl %0,28\n"
"1:\n"
EX_TABLE(0b,1b)
: "+d" (rc) : "a" (addr) : "cc");
return rc;
}
#endif

17
arch/s390/include/asm/os_info.h
View File

@ -8,6 +8,8 @@
#ifndef _ASM_S390_OS_INFO_H
#define _ASM_S390_OS_INFO_H
#include <linux/uio.h>
#define OS_INFO_VERSION_MAJOR 1
#define OS_INFO_VERSION_MINOR 1
#define OS_INFO_MAGIC 0x4f53494e464f535aULL /* OSINFOSZ */
@ -39,7 +41,20 @@ u32 os_info_csum(struct os_info *os_info);
#ifdef CONFIG_CRASH_DUMP
void *os_info_old_entry(int nr, unsigned long *size);
int copy_oldmem_kernel(void *dst, unsigned long src, size_t count);
size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count);
static inline int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
{
struct iov_iter iter;
struct kvec kvec;
kvec.iov_base = dst;
kvec.iov_len = count;
iov_iter_kvec(&iter, WRITE, &kvec, 1, count);
if (copy_oldmem_iter(&iter, src, count) < count)
return -EFAULT;
return 0;
}
#else
static inline void *os_info_old_entry(int nr, unsigned long *size)
{

4
arch/s390/include/asm/sclp.h
View File

@ -17,6 +17,7 @@
#define EXT_SCCB_READ_CPU (3 * PAGE_SIZE)
#ifndef __ASSEMBLY__
#include <linux/uio.h>
#include <asm/chpid.h>
#include <asm/cpu.h>
@ -146,8 +147,7 @@ int sclp_pci_deconfigure(u32 fid);
int sclp_ap_configure(u32 apid);
int sclp_ap_deconfigure(u32 apid);
int sclp_pci_report(struct zpci_report_error_header *report, u32 fh, u32 fid);
int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count);
int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count);
size_t memcpy_hsa_iter(struct iov_iter *iter, unsigned long src, size_t count);
void sclp_ocf_cpc_name_copy(char *dst);
static inline int sclp_get_core_info(struct sclp_core_info *info, int early)

1
arch/s390/include/asm/uaccess.h
View File

@ -285,7 +285,6 @@ static inline unsigned long __must_check clear_user(void __user *to, unsigned lo
return __clear_user(to, n);
}
int copy_to_user_real(void __user *dest, unsigned long src, unsigned long count);
void *s390_kernel_write(void *dst, const void *src, size_t size);
int __noreturn __put_kernel_bad(void);

2
arch/s390/include/asm/unwind.h
View File

@ -47,7 +47,7 @@ struct unwind_state {
static inline unsigned long unwind_recover_ret_addr(struct unwind_state *state,
unsigned long ip)
{
ip = ftrace_graph_ret_addr(state->task, &state->graph_idx, ip, NULL);
ip = ftrace_graph_ret_addr(state->task, &state->graph_idx, ip, (void *)state->sp);
if (is_kretprobe_trampoline(ip))
ip = kretprobe_find_ret_addr(state->task, (void *)state->sp, &state->kr_cur);
return ip;

2
arch/s390/kernel/Makefile
View File

@ -35,7 +35,7 @@ CFLAGS_unwind_bc.o += -fno-optimize-sibling-calls
obj-y := traps.o time.o process.o earlypgm.o early.o setup.o idle.o vtime.o
obj-y += processor.o syscall.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
obj-y += debug.o irq.o ipl.o dis.o diag.o vdso.o
obj-y += debug.o irq.o ipl.o dis.o diag.o vdso.o cpufeature.o
obj-y += sysinfo.o lgr.o os_info.o machine_kexec.o
obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o

46
arch/s390/kernel/cpufeature.c Normal file
View File

@ -0,0 +1,46 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2022
*/
#include <linux/cpufeature.h>
#include <linux/bug.h>
#include <asm/elf.h>
enum {
TYPE_HWCAP,
TYPE_FACILITY,
};
struct s390_cpu_feature {
unsigned int type : 4;
unsigned int num : 28;
};
static struct s390_cpu_feature s390_cpu_features[MAX_CPU_FEATURES] = {
[S390_CPU_FEATURE_MSA] = {.type = TYPE_HWCAP, .num = HWCAP_NR_MSA},
[S390_CPU_FEATURE_VXRS] = {.type = TYPE_HWCAP, .num = HWCAP_NR_VXRS},
[S390_CPU_FEATURE_UV] = {.type = TYPE_FACILITY, .num = 158},
};
/*
* cpu_have_feature - Test CPU features on module initialization
*/
int cpu_have_feature(unsigned int num)
{
struct s390_cpu_feature *feature;
if (WARN_ON_ONCE(num >= MAX_CPU_FEATURES))
return 0;
feature = &s390_cpu_features[num];
switch (feature->type) {
case TYPE_HWCAP:
return !!(elf_hwcap & BIT(feature->num));
case TYPE_FACILITY:
return test_facility(feature->num);
default:
WARN_ON_ONCE(1);
return 0;
}
}
EXPORT_SYMBOL(cpu_have_feature);

120
arch/s390/kernel/crash_dump.c
View File

@ -53,6 +53,8 @@ struct save_area {
};
static LIST_HEAD(dump_save_areas);
static DEFINE_MUTEX(memcpy_real_mutex);
static char memcpy_real_buf[PAGE_SIZE];
/*
* Allocate a save area
@ -63,7 +65,7 @@ struct save_area * __init save_area_alloc(bool is_boot_cpu)
sa = memblock_alloc(sizeof(*sa), 8);
if (!sa)
panic("Failed to allocate save area\n");
return NULL;
if (is_boot_cpu)
list_add(&sa->list, &dump_save_areas);
@ -114,38 +116,35 @@ void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs)
memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128));
}
/*
* Return physical address for virtual address
*/
static inline void *load_real_addr(void *addr)
static size_t copy_to_iter_real(struct iov_iter *iter, unsigned long src, size_t count)
{
unsigned long real_addr;
size_t len, copied, res = 0;
asm volatile(
" lra %0,0(%1)\n"
" jz 0f\n"
" la %0,0\n"
"0:"
: "=a" (real_addr) : "a" (addr) : "cc");
return (void *)real_addr;
mutex_lock(&memcpy_real_mutex);
while (count) {
len = min(PAGE_SIZE, count);
if (memcpy_real(memcpy_real_buf, src, len))
break;
copied = copy_to_iter(memcpy_real_buf, len, iter);
count -= copied;
src += copied;
res += copied;
if (copied < len)
break;
}
mutex_unlock(&memcpy_real_mutex);
return res;
}
/*
* Copy memory of the old, dumped system to a kernel space virtual address
*/
int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count)
{
unsigned long len;
void *ra;
int rc;
size_t len, copied, res = 0;
while (count) {
if (!oldmem_data.start && src < sclp.hsa_size) {
/* Copy from zfcp/nvme dump HSA area */
len = min(count, sclp.hsa_size - src);
rc = memcpy_hsa_kernel(dst, src, len);
if (rc)
return rc;
copied = memcpy_hsa_iter(iter, src, len);
} else {
/* Check for swapped kdump oldmem areas */
if (oldmem_data.start && src - oldmem_data.start < oldmem_data.size) {
@ -157,57 +156,15 @@ int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
} else {
len = count;
}
if (is_vmalloc_or_module_addr(dst)) {
ra = load_real_addr(dst);
len = min(PAGE_SIZE - offset_in_page(ra), len);
} else {
ra = dst;
}
if (memcpy_real(ra, src, len))
return -EFAULT;
copied = copy_to_iter_real(iter, src, len);
}
dst += len;
src += len;
count -= len;
count -= copied;
src += copied;
res += copied;
if (copied < len)
break;
}
return 0;
}
/*
* Copy memory of the old, dumped system to a user space virtual address
*/
static int copy_oldmem_user(void __user *dst, unsigned long src, size_t count)
{
unsigned long len;
int rc;
while (count) {
if (!oldmem_data.start && src < sclp.hsa_size) {
/* Copy from zfcp/nvme dump HSA area */
len = min(count, sclp.hsa_size - src);
rc = memcpy_hsa_user(dst, src, len);
if (rc)
return rc;
} else {
/* Check for swapped kdump oldmem areas */
if (oldmem_data.start && src - oldmem_data.start < oldmem_data.size) {
src -= oldmem_data.start;
len = min(count, oldmem_data.size - src);
} else if (oldmem_data.start && src < oldmem_data.size) {
len = min(count, oldmem_data.size - src);
src += oldmem_data.start;
} else {
len = count;
}
rc = copy_to_user_real(dst, src, count);
if (rc)
return rc;
}
dst += len;
src += len;
count -= len;
}
return 0;
return res;
}
/*
@ -217,26 +174,9 @@ ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, size_t csize,
unsigned long offset)
{
unsigned long src;
int rc;
if (!(iter_is_iovec(iter) || iov_iter_is_kvec(iter)))
return -EINVAL;
/* Multi-segment iterators are not supported */
if (iter->nr_segs > 1)
return -EINVAL;
if (!csize)
return 0;
src = pfn_to_phys(pfn) + offset;
/* XXX: pass the iov_iter down to a common function */
if (iter_is_iovec(iter))
rc = copy_oldmem_user(iter->iov->iov_base, src, csize);
else
rc = copy_oldmem_kernel(iter->kvec->iov_base, src, csize);
if (rc < 0)
return rc;
iov_iter_advance(iter, csize);
return csize;
return copy_oldmem_iter(iter, src, csize);
}
/*

8
arch/s390/kernel/nmi.c
View File

@ -11,6 +11,7 @@
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/entry-common.h>
#include <linux/hardirq.h>
#include <linux/log2.h>
#include <linux/kprobes.h>
@ -397,11 +398,12 @@ int notrace s390_do_machine_check(struct pt_regs *regs)
static unsigned long long last_ipd;
struct mcck_struct *mcck;
unsigned long long tmp;
irqentry_state_t irq_state;
union mci mci;
unsigned long mcck_dam_code;
int mcck_pending = 0;
nmi_enter();
irq_state = irqentry_nmi_enter(regs);
if (user_mode(regs))
update_timer_mcck();
@ -504,14 +506,14 @@ int notrace s390_do_machine_check(struct pt_regs *regs)
clear_cpu_flag(CIF_MCCK_GUEST);
if (user_mode(regs) && mcck_pending) {
nmi_exit();
irqentry_nmi_exit(regs, irq_state);
return 1;
}
if (mcck_pending)
schedule_mcck_handler();
nmi_exit();
irqentry_nmi_exit(regs, irq_state);
return 0;
}
NOKPROBE_SYMBOL(s390_do_machine_check);

10
arch/s390/kernel/processor.c
View File

@ -8,7 +8,6 @@
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/stop_machine.h>
#include <linux/cpufeature.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/random.h>
@ -96,15 +95,6 @@ void cpu_init(void)
enter_lazy_tlb(&init_mm, current);
}
/*
* cpu_have_feature - Test CPU features on module initialization
*/
int cpu_have_feature(unsigned int num)
{
return elf_hwcap & (1UL << num);
}
EXPORT_SYMBOL(cpu_have_feature);
static void show_facilities(struct seq_file *m)
{
unsigned int bit;

13
arch/s390/kernel/setup.c
View File

@ -474,19 +474,18 @@ static void __init setup_lowcore_dat_off(void)
lc->restart_data = 0;
lc->restart_source = -1U;
mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
if (!mcck_stack)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
__func__, THREAD_SIZE, THREAD_SIZE);
lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
/* Setup absolute zero lowcore */
put_abs_lowcore(restart_stack, lc->restart_stack);
put_abs_lowcore(restart_fn, lc->restart_fn);
put_abs_lowcore(restart_data, lc->restart_data);
put_abs_lowcore(restart_source, lc->restart_source);
put_abs_lowcore(restart_psw, lc->restart_psw);
mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
if (!mcck_stack)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
__func__, THREAD_SIZE, THREAD_SIZE);
lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
lc->spinlock_lockval = arch_spin_lockval(0);
lc->spinlock_index = 0;
arch_spin_lock_setup(0);

26
arch/s390/mm/maccess.c
View File

@ -171,32 +171,6 @@ void memcpy_absolute(void *dest, void *src, size_t count)
arch_local_irq_restore(flags);
}
/*
* Copy memory from kernel (real) to user (virtual)
*/
int copy_to_user_real(void __user *dest, unsigned long src, unsigned long count)
{
int offs = 0, size, rc;
char *buf;
buf = (char *) __get_free_page(GFP_KERNEL);
if (!buf)
return -ENOMEM;
rc = -EFAULT;
while (offs < count) {
size = min(PAGE_SIZE, count - offs);
if (memcpy_real(buf, src + offs, size))
goto out;
if (copy_to_user(dest + offs, buf, size))
goto out;
offs += size;
}
rc = 0;
out:
free_page((unsigned long) buf);
return rc;
}
/*
* Check if physical address is within prefix or zero page
*/

2
drivers/char/hw_random/s390-trng.c
View File

@ -252,5 +252,5 @@ static void __exit trng_exit(void)
trng_debug_exit();
}
module_cpu_feature_match(MSA, trng_init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, trng_init);
module_exit(trng_exit);

2
drivers/s390/char/Kconfig
View File

@ -89,7 +89,7 @@ config HMC_DRV
Management Console (HMC) drive CD/DVD-ROM. It is available as a
module, called 'hmcdrv', and also as kernel built-in. There is one
optional parameter for this module: cachesize=N, which modifies the
transfer cache size from it's default value 0.5MB to N bytes. If N
transfer cache size from its default value 0.5MB to N bytes. If N
is zero, then no caching is performed.
config SCLP_OFB

2
drivers/s390/char/tape_34xx.c
View File

@ -548,7 +548,7 @@ tape_34xx_unit_check(struct tape_device *device, struct tape_request *request,
case 0x2e:
/*
* Not capable. This indicates either that the drive fails
* reading the format id mark or that that format specified
* reading the format id mark or that format specified
* is not supported by the drive.
*/
dev_warn (&device->cdev->dev, "The tape unit cannot process "

5
drivers/s390/char/uvdevice.c
View File

@ -27,6 +27,7 @@
#include <linux/stddef.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/cpufeature.h>
#include <asm/uvdevice.h>
#include <asm/uv.h>
@ -244,12 +245,10 @@ static void __exit uvio_dev_exit(void)
static int __init uvio_dev_init(void)
{
if (!test_facility(158))
return -ENXIO;
return misc_register(&uvio_dev_miscdev);
}
module_init(uvio_dev_init);
module_cpu_feature_match(S390_CPU_FEATURE_UV, uvio_dev_init);
module_exit(uvio_dev_exit);
MODULE_AUTHOR("IBM Corporation");

55
drivers/s390/char/zcore.c
View File

@ -17,6 +17,7 @@
#include <linux/debugfs.h>
#include <linux/panic_notifier.h>
#include <linux/reboot.h>
#include <linux/uio.h>
#include <asm/asm-offsets.h>
#include <asm/ipl.h>
@ -50,36 +51,41 @@ static struct dentry *zcore_reipl_file;
static struct dentry *zcore_hsa_file;
static struct ipl_parameter_block *zcore_ipl_block;
static DEFINE_MUTEX(hsa_buf_mutex);
static char hsa_buf[PAGE_SIZE] __aligned(PAGE_SIZE);
/*
* Copy memory from HSA to user memory (not reentrant):
* Copy memory from HSA to iterator (not reentrant):
*
* @dest: User buffer where memory should be copied to
* @iter: Iterator where memory should be copied to
* @src: Start address within HSA where data should be copied
* @count: Size of buffer, which should be copied
*/
int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
size_t memcpy_hsa_iter(struct iov_iter *iter, unsigned long src, size_t count)
{
unsigned long offset, bytes;
size_t bytes, copied, res = 0;
unsigned long offset;
if (!hsa_available)
return -ENODATA;
return 0;
mutex_lock(&hsa_buf_mutex);
while (count) {
if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) {
TRACE("sclp_sdias_copy() failed\n");
return -EIO;
break;
}
offset = src % PAGE_SIZE;
bytes = min(PAGE_SIZE - offset, count);
if (copy_to_user(dest, hsa_buf + offset, bytes))
return -EFAULT;
src += bytes;
dest += bytes;
count -= bytes;
copied = copy_to_iter(hsa_buf + offset, bytes, iter);
count -= copied;
src += copied;
res += copied;
if (copied < bytes)
break;
}
return 0;
mutex_unlock(&hsa_buf_mutex);
return res;
}
/*
@ -89,25 +95,16 @@ int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
* @src: Start address within HSA where data should be copied
* @count: Size of buffer, which should be copied
*/
int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
static inline int memcpy_hsa_kernel(void *dst, unsigned long src, size_t count)
{
unsigned long offset, bytes;
struct iov_iter iter;
struct kvec kvec;
if (!hsa_available)
return -ENODATA;
while (count) {
if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) {
TRACE("sclp_sdias_copy() failed\n");
return -EIO;
}
offset = src % PAGE_SIZE;
bytes = min(PAGE_SIZE - offset, count);
memcpy(dest, hsa_buf + offset, bytes);
src += bytes;
dest += bytes;
count -= bytes;
}
kvec.iov_base = dst;
kvec.iov_len = count;
iov_iter_kvec(&iter, WRITE, &kvec, 1, count);
if (memcpy_hsa_iter(&iter, src, count) < count)
return -EIO;
return 0;
}

31
drivers/s390/crypto/ap_bus.c
View File

@ -838,6 +838,17 @@ static void ap_bus_revise_bindings(void)
bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revise_reserved);
}
/**
* ap_owned_by_def_drv: indicates whether an AP adapter is reserved for the
* default host driver or not.
* @card: the APID of the adapter card to check
* @queue: the APQI of the queue to check
*
* Note: the ap_perms_mutex must be locked by the caller of this function.
*
* Return: an int specifying whether the AP adapter is reserved for the host (1)
* or not (0).
*/
int ap_owned_by_def_drv(int card, int queue)
{
int rc = 0;
@ -845,25 +856,31 @@ int ap_owned_by_def_drv(int card, int queue)
if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS)
return -EINVAL;
mutex_lock(&ap_perms_mutex);
if (test_bit_inv(card, ap_perms.apm) &&
test_bit_inv(queue, ap_perms.aqm))
rc = 1;
mutex_unlock(&ap_perms_mutex);
return rc;
}
EXPORT_SYMBOL(ap_owned_by_def_drv);
/**
* ap_apqn_in_matrix_owned_by_def_drv: indicates whether every APQN contained in
* a set is reserved for the host drivers
* or not.
* @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
*
* Note: the ap_perms_mutex must be locked by the caller of this function.
*
* Return: an int specifying whether each APQN is reserved for the host (1) or
* not (0)
*/
int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
unsigned long *aqm)
{
int card, queue, rc = 0;
mutex_lock(&ap_perms_mutex);
for (card = 0; !rc && card < AP_DEVICES; card++)
if (test_bit_inv(card, apm) &&
test_bit_inv(card, ap_perms.apm))
@ -872,8 +889,6 @@ int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
test_bit_inv(queue, ap_perms.aqm))
rc = 1;
mutex_unlock(&ap_perms_mutex);
return rc;
}
EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv);

2
drivers/s390/crypto/pkey_api.c
View File

@ -2115,5 +2115,5 @@ static void __exit pkey_exit(void)
pkey_debug_exit();
}
module_cpu_feature_match(MSA, pkey_init);
module_cpu_feature_match(S390_CPU_FEATURE_MSA, pkey_init);
module_exit(pkey_exit);

124
drivers/s390/crypto/vfio_ap_drv.c
View File

@ -18,9 +18,6 @@
#define VFIO_AP_ROOT_NAME "vfio_ap"
#define VFIO_AP_DEV_NAME "matrix"
#define AP_QUEUE_ASSIGNED "assigned"
#define AP_QUEUE_UNASSIGNED "unassigned"
#define AP_QUEUE_IN_USE "in use"
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
@ -46,120 +43,12 @@ static struct ap_device_id ap_queue_ids[] = {
{ /* end of sibling */ },
};
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;
struct ap_matrix_mdev *matrix_mdev;
struct ap_device *apdev = to_ap_dev(dev);
mutex_lock(&matrix_dev->lock);
q = dev_get_drvdata(&apdev->device);
matrix_mdev = vfio_ap_mdev_for_queue(q);
if (matrix_mdev) {
if (matrix_mdev->kvm)
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->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,
};
/**
* vfio_ap_queue_dev_probe: Allocate a vfio_ap_queue structure and associate it
* with the device as driver_data.
*
* @apdev: the AP device being probed
*
* Return: returns 0 if the probe succeeded; otherwise, returns an error if
* storage could not be allocated for a vfio_ap_queue object or the
* sysfs 'status' attribute could not be created for the queue device.
*/
static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
{
int ret;
struct vfio_ap_queue *q;
q = kzalloc(sizeof(*q), GFP_KERNEL);
if (!q)
return -ENOMEM;
mutex_lock(&matrix_dev->lock);
dev_set_drvdata(&apdev->device, q);
q->apqn = to_ap_queue(&apdev->device)->qid;
q->saved_isc = VFIO_AP_ISC_INVALID;
ret = sysfs_create_group(&apdev->device.kobj, &vfio_queue_attr_group);
if (ret) {
dev_set_drvdata(&apdev->device, NULL);
kfree(q);
}
mutex_unlock(&matrix_dev->lock);
return ret;
}
/**
* vfio_ap_queue_dev_remove: Free the associated vfio_ap_queue structure.
*
* @apdev: the AP device being removed
*
* Takes the matrix lock to avoid actions on this device while doing the remove.
*/
static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
{
struct vfio_ap_queue *q;
mutex_lock(&matrix_dev->lock);
sysfs_remove_group(&apdev->device.kobj, &vfio_queue_attr_group);
q = dev_get_drvdata(&apdev->device);
vfio_ap_mdev_reset_queue(q, 1);
dev_set_drvdata(&apdev->device, NULL);
kfree(q);
mutex_unlock(&matrix_dev->lock);
}
static struct ap_driver vfio_ap_drv = {
.probe = vfio_ap_queue_dev_probe,
.remove = vfio_ap_queue_dev_remove,
.probe = vfio_ap_mdev_probe_queue,
.remove = vfio_ap_mdev_remove_queue,
.in_use = vfio_ap_mdev_resource_in_use,
.on_config_changed = vfio_ap_on_cfg_changed,
.on_scan_complete = vfio_ap_on_scan_complete,
.ids = ap_queue_ids,
};
@ -212,8 +101,9 @@ static int vfio_ap_matrix_dev_create(void)
goto matrix_alloc_err;
}
mutex_init(&matrix_dev->lock);
mutex_init(&matrix_dev->mdevs_lock);
INIT_LIST_HEAD(&matrix_dev->mdev_list);
mutex_init(&matrix_dev->guests_lock);
dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
matrix_dev->device.parent = root_device;

1447
drivers/s390/crypto/vfio_ap_ops.c
View File

File diff suppressed because it is too large Load Diff

47
drivers/s390/crypto/vfio_ap_private.h
View File

@ -19,6 +19,7 @@
#include <linux/mutex.h>
#include <linux/kvm_host.h>
#include <linux/vfio.h>
#include <linux/hashtable.h>
#include "ap_bus.h"
@ -32,20 +33,26 @@
* @available_instances: number of mediated matrix devices that can be created
* @info: the struct containing the output from the PQAP(QCI) instruction
* @mdev_list: the list of mediated matrix devices created
* @lock: mutex for locking the AP matrix device. This lock will be
* @mdevs_lock: mutex for locking the AP matrix device. This lock will be
* taken every time we fiddle with state managed by the vfio_ap
* driver, be it using @mdev_list or writing the state of a
* single ap_matrix_mdev device. It's quite coarse but we don't
* expect much contention.
* @vfio_ap_drv: the vfio_ap device driver
* @guests_lock: mutex for controlling access to a guest that is using AP
* devices passed through by the vfio_ap device driver. This lock
* will be taken when the AP devices are plugged into or unplugged
* from a guest, and when an ap_matrix_mdev device is added to or
* removed from @mdev_list or the list is iterated.
*/
struct ap_matrix_dev {
struct device device;
atomic_t available_instances;
struct ap_config_info info;
struct list_head mdev_list;
struct mutex lock;
struct mutex mdevs_lock; /* serializes access to each ap_matrix_mdev */
struct ap_driver *vfio_ap_drv;
struct mutex guests_lock; /* serializes access to each KVM guest */
};
extern struct ap_matrix_dev *matrix_dev;
@ -74,6 +81,15 @@ struct ap_matrix {
DECLARE_BITMAP(adm, 256);
};
/**
* struct ap_queue_table - a table of queue objects.
*
* @queues: a hashtable of queues (struct vfio_ap_queue).
*/
struct ap_queue_table {
DECLARE_HASHTABLE(queues, 8);
};
/**
* struct ap_matrix_mdev - Contains the data associated with a matrix mediated
* device.
@ -81,18 +97,29 @@ struct ap_matrix {
* @node: allows the ap_matrix_mdev struct to be added to a list
* @matrix: the adapters, usage domains and control domains assigned to the
* mediated matrix device.
* @shadow_apcb: the shadow copy of the APCB field of the KVM guest's CRYCB
* @kvm: the struct holding guest's state
* @pqap_hook: the function pointer to the interception handler for the
* PQAP(AQIC) instruction.
* @mdev: the mediated device
* @qtable: table of queues (struct vfio_ap_queue) assigned to the mdev
* @apm_add: bitmap of APIDs added to the host's AP configuration
* @aqm_add: bitmap of APQIs added to the host's AP configuration
* @adm_add: bitmap of control domain numbers added to the host's AP
* configuration
*/
struct ap_matrix_mdev {
struct vfio_device vdev;
struct list_head node;
struct ap_matrix matrix;
struct ap_matrix shadow_apcb;
struct kvm *kvm;
crypto_hook pqap_hook;
struct mdev_device *mdev;
struct ap_queue_table qtable;
DECLARE_BITMAP(apm_add, AP_DEVICES);
DECLARE_BITMAP(aqm_add, AP_DOMAINS);
DECLARE_BITMAP(adm_add, AP_DOMAINS);
};
/**
@ -102,6 +129,8 @@ struct ap_matrix_mdev {
* @saved_iova: the notification indicator byte (nib) address
* @apqn: the APQN of the AP queue device
* @saved_isc: the guest ISC registered with the GIB interface
* @mdev_qnode: allows the vfio_ap_queue struct to be added to a hashtable
* @reset_rc: the status response code from the last reset of the queue
*/
struct vfio_ap_queue {
struct ap_matrix_mdev *matrix_mdev;
@ -109,11 +138,21 @@ struct vfio_ap_queue {
int apqn;
#define VFIO_AP_ISC_INVALID 0xff
unsigned char saved_isc;
struct hlist_node mdev_qnode;
unsigned int reset_rc;
};
int vfio_ap_mdev_register(void);
void vfio_ap_mdev_unregister(void);
int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q,
unsigned int retry);
int vfio_ap_mdev_probe_queue(struct ap_device *queue);
void vfio_ap_mdev_remove_queue(struct ap_device *queue);
int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm);
void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info,
struct ap_config_info *old_config_info);
void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info,
struct ap_config_info *old_config_info);
#endif /* _VFIO_AP_PRIVATE_H_ */

1
include/uapi/linux/elf.h
View File

@ -420,6 +420,7 @@ typedef struct elf64_shdr {
#define NT_S390_GS_CB 0x30b /* s390 guarded storage registers */
#define NT_S390_GS_BC 0x30c /* s390 guarded storage broadcast control block */
#define NT_S390_RI_CB 0x30d /* s390 runtime instrumentation */
#define NT_S390_PV_CPU_DATA 0x30e /* s390 protvirt cpu dump data */
#define NT_ARM_VFP 0x400 /* ARM VFP/NEON registers */
#define NT_ARM_TLS 0x401 /* ARM TLS register */
#define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */

9
tools/testing/crypto/chacha20-s390/test-cipher.c
View File

@ -252,29 +252,26 @@ static int __init chacha_s390_test_init(void)
memset(plain, 'a', data_size);
get_random_bytes(plain, (data_size > 256 ? 256 : data_size));
cipher_generic = vmalloc(data_size);
cipher_generic = vzalloc(data_size);
if (!cipher_generic) {
pr_info("could not allocate cipher_generic buffer\n");
ret = -2;
goto out;
}
memset(cipher_generic, 0, data_size);
cipher_s390 = vmalloc(data_size);
cipher_s390 = vzalloc(data_size);
if (!cipher_s390) {
pr_info("could not allocate cipher_s390 buffer\n");
ret = -2;
goto out;
}
memset(cipher_s390, 0, data_size);
revert = vmalloc(data_size);
revert = vzalloc(data_size);
if (!revert) {
pr_info("could not allocate revert buffer\n");
ret = -2;
goto out;
}
memset(revert, 0, data_size);
if (debug)
print_hex_dump(KERN_INFO, "src: ", DUMP_PREFIX_OFFSET,