similarity index 77%
rename from Documentation/virt/kvm/devices/arm-vgic-v3.txt
rename to Documentation/virt/kvm/devices/arm-vgic-v3.rst
@@ -1,9 +1,12 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================================================
ARM Virtual Generic Interrupt Controller v3 and later (VGICv3)
==============================================================
Device types supported:
- KVM_DEV_TYPE_ARM_VGIC_V3 ARM Generic Interrupt Controller v3.0
+ - KVM_DEV_TYPE_ARM_VGIC_V3 ARM Generic Interrupt Controller v3.0
Only one VGIC instance may be instantiated through this API. The created VGIC
will act as the VM interrupt controller, requiring emulated user-space devices
@@ -15,7 +18,8 @@ Creating a guest GICv3 device requires a host GICv3 as well.
Groups:
KVM_DEV_ARM_VGIC_GRP_ADDR
- Attributes:
+ Attributes:
+
KVM_VGIC_V3_ADDR_TYPE_DIST (rw, 64-bit)
Base address in the guest physical address space of the GICv3 distributor
register mappings. Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
@@ -29,21 +33,25 @@ Groups:
This address needs to be 64K aligned.
KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION (rw, 64-bit)
- The attribute data pointed to by kvm_device_attr.addr is a __u64 value:
- bits: | 63 .... 52 | 51 .... 16 | 15 - 12 |11 - 0
- values: | count | base | flags | index
+ The attribute data pointed to by kvm_device_attr.addr is a __u64 value::
+
+ bits: | 63 .... 52 | 51 .... 16 | 15 - 12 |11 - 0
+ values: | count | base | flags | index
+
- index encodes the unique redistributor region index
- flags: reserved for future use, currently 0
- base field encodes bits [51:16] of the guest physical base address
of the first redistributor in the region.
- count encodes the number of redistributors in the region. Must be
greater than 0.
+
There are two 64K pages for each redistributor in the region and
redistributors are laid out contiguously within the region. Regions
are filled with redistributors in the index order. The sum of all
region count fields must be greater than or equal to the number of
VCPUs. Redistributor regions must be registered in the incremental
index order, starting from index 0.
+
The characteristics of a specific redistributor region can be read
by presetting the index field in the attr data.
Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
@@ -52,23 +60,27 @@ Groups:
KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION attributes.
Errors:
- -E2BIG: Address outside of addressable IPA range
- -EINVAL: Incorrectly aligned address, bad redistributor region
+
+ ======= =============================================================
+ -E2BIG Address outside of addressable IPA range
+ -EINVAL Incorrectly aligned address, bad redistributor region
count/index, mixed redistributor region attribute usage
- -EEXIST: Address already configured
- -ENOENT: Attempt to read the characteristics of a non existing
+ -EEXIST Address already configured
+ -ENOENT Attempt to read the characteristics of a non existing
redistributor region
- -ENXIO: The group or attribute is unknown/unsupported for this device
+ -ENXIO The group or attribute is unknown/unsupported for this device
or hardware support is missing.
- -EFAULT: Invalid user pointer for attr->addr.
+ -EFAULT Invalid user pointer for attr->addr.
+ ======= =============================================================
- KVM_DEV_ARM_VGIC_GRP_DIST_REGS
- KVM_DEV_ARM_VGIC_GRP_REDIST_REGS
- Attributes:
- The attr field of kvm_device_attr encodes two values:
- bits: | 63 .... 32 | 31 .... 0 |
- values: | mpidr | offset |
+ KVM_DEV_ARM_VGIC_GRP_DIST_REGS, KVM_DEV_ARM_VGIC_GRP_REDIST_REGS
+ Attributes:
+
+ The attr field of kvm_device_attr encodes two values::
+
+ bits: | 63 .... 32 | 31 .... 0 |
+ values: | mpidr | offset |
All distributor regs are (rw, 32-bit) and kvm_device_attr.addr points to a
__u32 value. 64-bit registers must be accessed by separately accessing the
@@ -93,7 +105,8 @@ Groups:
redistributor is accessed. The mpidr is ignored for the distributor.
The mpidr encoding is based on the affinity information in the
- architecture defined MPIDR, and the field is encoded as follows:
+ architecture defined MPIDR, and the field is encoded as follows::
+
| 63 .... 56 | 55 .... 48 | 47 .... 40 | 39 .... 32 |
| Aff3 | Aff2 | Aff1 | Aff0 |
@@ -148,24 +161,30 @@ Groups:
ignored.
Errors:
- -ENXIO: Getting or setting this register is not yet supported
- -EBUSY: One or more VCPUs are running
+
+ ====== =====================================================
+ -ENXIO Getting or setting this register is not yet supported
+ -EBUSY One or more VCPUs are running
+ ====== =====================================================
KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS
- Attributes:
- The attr field of kvm_device_attr encodes two values:
- bits: | 63 .... 32 | 31 .... 16 | 15 .... 0 |
- values: | mpidr | RES | instr |
+ Attributes:
+
+ The attr field of kvm_device_attr encodes two values::
+
+ bits: | 63 .... 32 | 31 .... 16 | 15 .... 0 |
+ values: | mpidr | RES | instr |
The mpidr field encodes the CPU ID based on the affinity information in the
- architecture defined MPIDR, and the field is encoded as follows:
+ architecture defined MPIDR, and the field is encoded as follows::
+
| 63 .... 56 | 55 .... 48 | 47 .... 40 | 39 .... 32 |
| Aff3 | Aff2 | Aff1 | Aff0 |
The instr field encodes the system register to access based on the fields
defined in the A64 instruction set encoding for system register access
- (RES means the bits are reserved for future use and should be zero):
+ (RES means the bits are reserved for future use and should be zero)::
| 15 ... 14 | 13 ... 11 | 10 ... 7 | 6 ... 3 | 2 ... 0 |
| Op 0 | Op1 | CRn | CRm | Op2 |
@@ -178,26 +197,35 @@ Groups:
CPU interface registers access is not implemented for AArch32 mode.
Error -ENXIO is returned when accessed in AArch32 mode.
+
Errors:
- -ENXIO: Getting or setting this register is not yet supported
- -EBUSY: VCPU is running
- -EINVAL: Invalid mpidr or register value supplied
+
+ ======= =====================================================
+ -ENXIO Getting or setting this register is not yet supported
+ -EBUSY VCPU is running
+ -EINVAL Invalid mpidr or register value supplied
+ ======= =====================================================
KVM_DEV_ARM_VGIC_GRP_NR_IRQS
- Attributes:
+ Attributes:
+
A value describing the number of interrupts (SGI, PPI and SPI) for
this GIC instance, ranging from 64 to 1024, in increments of 32.
kvm_device_attr.addr points to a __u32 value.
Errors:
- -EINVAL: Value set is out of the expected range
- -EBUSY: Value has already be set.
+
+ ======= ======================================
+ -EINVAL Value set is out of the expected range
+ -EBUSY Value has already be set.
+ ======= ======================================
KVM_DEV_ARM_VGIC_GRP_CTRL
- Attributes:
+ Attributes:
+
KVM_DEV_ARM_VGIC_CTRL_INIT
request the initialization of the VGIC, no additional parameter in
kvm_device_attr.addr.
@@ -205,20 +233,26 @@ Groups:
save all LPI pending bits into guest RAM pending tables.
The first kB of the pending table is not altered by this operation.
+
Errors:
- -ENXIO: VGIC not properly configured as required prior to calling
- this attribute
- -ENODEV: no online VCPU
- -ENOMEM: memory shortage when allocating vgic internal data
- -EFAULT: Invalid guest ram access
- -EBUSY: One or more VCPUS are running
+
+ ======= ========================================================
+ -ENXIO VGIC not properly configured as required prior to calling
+ this attribute
+ -ENODEV no online VCPU
+ -ENOMEM memory shortage when allocating vgic internal data
+ -EFAULT Invalid guest ram access
+ -EBUSY One or more VCPUS are running
+ ======= ========================================================
KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO
- Attributes:
- The attr field of kvm_device_attr encodes the following values:
- bits: | 63 .... 32 | 31 .... 10 | 9 .... 0 |
- values: | mpidr | info | vINTID |
+ Attributes:
+
+ The attr field of kvm_device_attr encodes the following values::
+
+ bits: | 63 .... 32 | 31 .... 10 | 9 .... 0 |
+ values: | mpidr | info | vINTID |
The vINTID specifies which set of IRQs is reported on.
@@ -228,6 +262,7 @@ Groups:
VGIC_LEVEL_INFO_LINE_LEVEL:
Get/Set the input level of the IRQ line for a set of 32 contiguously
numbered interrupts.
+
vINTID must be a multiple of 32.
kvm_device_attr.addr points to a __u32 value which will contain a
@@ -243,9 +278,14 @@ Groups:
reported with the same value regardless of the mpidr specified.
The mpidr field encodes the CPU ID based on the affinity information in the
- architecture defined MPIDR, and the field is encoded as follows:
+ architecture defined MPIDR, and the field is encoded as follows::
+
| 63 .... 56 | 55 .... 48 | 47 .... 40 | 39 .... 32 |
| Aff3 | Aff2 | Aff1 | Aff0 |
+
Errors:
- -EINVAL: vINTID is not multiple of 32 or
- info field is not VGIC_LEVEL_INFO_LINE_LEVEL
+
+ ======= =============================================
+ -EINVAL vINTID is not multiple of 32 or info field is
+ not VGIC_LEVEL_INFO_LINE_LEVEL
+ ======= =============================================
@@ -8,3 +8,4 @@ Devices
:maxdepth: 2
arm-vgic-its
+ arm-vgic-v3
- Use title markups; - change indent to match ReST syntax; - use proper table markups; - use literal block markups. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> --- .../{arm-vgic-v3.txt => arm-vgic-v3.rst} | 132 ++++++++++++------ Documentation/virt/kvm/devices/index.rst | 1 + 2 files changed, 87 insertions(+), 46 deletions(-) rename Documentation/virt/kvm/devices/{arm-vgic-v3.txt => arm-vgic-v3.rst} (77%)