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| author | Matthew Rosato <mjrosato@linux.ibm.com> | 2022-06-06 16:33:24 -0400 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@linux.ibm.com> | 2022-07-11 09:54:38 +0200 |
| commit | db1c875e0539518e3d5fe9876ef50975cf4476bb (patch) | |
| tree | e6e24c820d1c4b18cf340d554da0fbbb1eb80f56 /Documentation/virt | |
| parent | ba6090ff8ae01b41288be87ed9f6bed3d8cf5961 (diff) | |
| download | linux-db1c875e0539518e3d5fe9876ef50975cf4476bb.tar.gz | |
KVM: s390: add KVM_S390_ZPCI_OP to manage guest zPCI devices
The KVM_S390_ZPCI_OP ioctl provides a mechanism for managing
hardware-assisted virtualization features for s390x zPCI passthrough.
Add the first 2 operations, which can be used to enable/disable
the specified device for Adapter Event Notification interpretation.
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20220606203325.110625-21-mjrosato@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Diffstat (limited to 'Documentation/virt')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 11e00a46c610f9..d58354e9af8f14 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -5802,6 +5802,53 @@ of CPUID leaf 0xD on the host. This ioctl injects an event channel interrupt directly to the guest vCPU. +4.137 KVM_S390_ZPCI_OP +-------------------- + +:Capability: KVM_CAP_S390_ZPCI_OP +:Architectures: s390 +:Type: vm ioctl +:Parameters: struct kvm_s390_zpci_op (in) +:Returns: 0 on success, <0 on error + +Used to manage hardware-assisted virtualization features for zPCI devices. + +Parameters are specified via the following structure:: + + struct kvm_s390_zpci_op { + /* in */ + __u32 fh; /* target device */ + __u8 op; /* operation to perform */ + __u8 pad[3]; + union { + /* for KVM_S390_ZPCIOP_REG_AEN */ + struct { + __u64 ibv; /* Guest addr of interrupt bit vector */ + __u64 sb; /* Guest addr of summary bit */ + __u32 flags; + __u32 noi; /* Number of interrupts */ + __u8 isc; /* Guest interrupt subclass */ + __u8 sbo; /* Offset of guest summary bit vector */ + __u16 pad; + } reg_aen; + __u64 reserved[8]; + } u; + }; + +The type of operation is specified in the "op" field. +KVM_S390_ZPCIOP_REG_AEN is used to register the VM for adapter event +notification interpretation, which will allow firmware delivery of adapter +events directly to the vm, with KVM providing a backup delivery mechanism; +KVM_S390_ZPCIOP_DEREG_AEN is used to subsequently disable interpretation of +adapter event notifications. + +The target zPCI function must also be specified via the "fh" field. For the +KVM_S390_ZPCIOP_REG_AEN operation, additional information to establish firmware +delivery must be provided via the "reg_aen" struct. + +The "pad" and "reserved" fields may be used for future extensions and should be +set to 0s by userspace. + 5. The kvm_run structure ======================== |