mirror of
https://github.com/torvalds/linux.git
synced 2024-12-26 21:02:19 +00:00
e777a5bd98
- Use title markups; - adjust indentation and add blank lines as needed; - adjust tables to match ReST accepted formats; - use :field: markups; - mark code blocks as such. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
115 lines
4.2 KiB
ReStructuredText
115 lines
4.2 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
======================
|
|
Generic vcpu interface
|
|
======================
|
|
|
|
The virtual cpu "device" also accepts the ioctls KVM_SET_DEVICE_ATTR,
|
|
KVM_GET_DEVICE_ATTR, and KVM_HAS_DEVICE_ATTR. The interface uses the same struct
|
|
kvm_device_attr as other devices, but targets VCPU-wide settings and controls.
|
|
|
|
The groups and attributes per virtual cpu, if any, are architecture specific.
|
|
|
|
1. GROUP: KVM_ARM_VCPU_PMU_V3_CTRL
|
|
==================================
|
|
|
|
:Architectures: ARM64
|
|
|
|
1.1. ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_IRQ
|
|
---------------------------------------
|
|
|
|
:Parameters: in kvm_device_attr.addr the address for PMU overflow interrupt is a
|
|
pointer to an int
|
|
|
|
Returns:
|
|
|
|
======= ========================================================
|
|
-EBUSY The PMU overflow interrupt is already set
|
|
-ENXIO The overflow interrupt not set when attempting to get it
|
|
-ENODEV PMUv3 not supported
|
|
-EINVAL Invalid PMU overflow interrupt number supplied or
|
|
trying to set the IRQ number without using an in-kernel
|
|
irqchip.
|
|
======= ========================================================
|
|
|
|
A value describing the PMUv3 (Performance Monitor Unit v3) overflow interrupt
|
|
number for this vcpu. This interrupt could be a PPI or SPI, but the interrupt
|
|
type must be same for each vcpu. As a PPI, the interrupt number is the same for
|
|
all vcpus, while as an SPI it must be a separate number per vcpu.
|
|
|
|
1.2 ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_INIT
|
|
---------------------------------------
|
|
|
|
:Parameters: no additional parameter in kvm_device_attr.addr
|
|
|
|
Returns:
|
|
|
|
======= ======================================================
|
|
-ENODEV PMUv3 not supported or GIC not initialized
|
|
-ENXIO PMUv3 not properly configured or in-kernel irqchip not
|
|
configured as required prior to calling this attribute
|
|
-EBUSY PMUv3 already initialized
|
|
======= ======================================================
|
|
|
|
Request the initialization of the PMUv3. If using the PMUv3 with an in-kernel
|
|
virtual GIC implementation, this must be done after initializing the in-kernel
|
|
irqchip.
|
|
|
|
|
|
2. GROUP: KVM_ARM_VCPU_TIMER_CTRL
|
|
=================================
|
|
|
|
:Architectures: ARM, ARM64
|
|
|
|
2.1. ATTRIBUTES: KVM_ARM_VCPU_TIMER_IRQ_VTIMER, KVM_ARM_VCPU_TIMER_IRQ_PTIMER
|
|
-----------------------------------------------------------------------------
|
|
|
|
:Parameters: in kvm_device_attr.addr the address for the timer interrupt is a
|
|
pointer to an int
|
|
|
|
Returns:
|
|
|
|
======= =================================
|
|
-EINVAL Invalid timer interrupt number
|
|
-EBUSY One or more VCPUs has already run
|
|
======= =================================
|
|
|
|
A value describing the architected timer interrupt number when connected to an
|
|
in-kernel virtual GIC. These must be a PPI (16 <= intid < 32). Setting the
|
|
attribute overrides the default values (see below).
|
|
|
|
============================= ==========================================
|
|
KVM_ARM_VCPU_TIMER_IRQ_VTIMER The EL1 virtual timer intid (default: 27)
|
|
KVM_ARM_VCPU_TIMER_IRQ_PTIMER The EL1 physical timer intid (default: 30)
|
|
============================= ==========================================
|
|
|
|
Setting the same PPI for different timers will prevent the VCPUs from running.
|
|
Setting the interrupt number on a VCPU configures all VCPUs created at that
|
|
time to use the number provided for a given timer, overwriting any previously
|
|
configured values on other VCPUs. Userspace should configure the interrupt
|
|
numbers on at least one VCPU after creating all VCPUs and before running any
|
|
VCPUs.
|
|
|
|
3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL
|
|
==================================
|
|
|
|
:Architectures: ARM64
|
|
|
|
3.1 ATTRIBUTE: KVM_ARM_VCPU_PVTIME_IPA
|
|
--------------------------------------
|
|
|
|
:Parameters: 64-bit base address
|
|
|
|
Returns:
|
|
|
|
======= ======================================
|
|
-ENXIO Stolen time not implemented
|
|
-EEXIST Base address already set for this VCPU
|
|
-EINVAL Base address not 64 byte aligned
|
|
======= ======================================
|
|
|
|
Specifies the base address of the stolen time structure for this VCPU. The
|
|
base address must be 64 byte aligned and exist within a valid guest memory
|
|
region. See Documentation/virt/kvm/arm/pvtime.txt for more information
|
|
including the layout of the stolen time structure.
|