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| author | Shannon Zhao <shannon.zhao@linaro.org> | 2016-01-11 14:35:32 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-02-29 19:34:21 +0100 |
| commit | bb0c70bcca6ba3c84afc2da7426f3b923bbe6825 (patch) | |
| tree | d9be51e3943387e1d402d84040541e51ee3a2525 /Documentation/virtual | |
| parent | arm64: KVM: Introduce per-vcpu kvm device controls (diff) | |
| download | linux-bb0c70bcca6ba3c84afc2da7426f3b923bbe6825.tar.xz linux-bb0c70bcca6ba3c84afc2da7426f3b923bbe6825.zip | |
arm64: KVM: Add a new vcpu device control group for PMUv3
To configure the virtual PMUv3 overflow interrupt number, we use the
vcpu kvm_device ioctl, encapsulating the KVM_ARM_VCPU_PMU_V3_IRQ
attribute within the KVM_ARM_VCPU_PMU_V3_CTRL group.
After configuring the PMUv3, call the vcpu ioctl with attribute
KVM_ARM_VCPU_PMU_V3_INIT to initialize the PMUv3.
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/devices/vcpu.txt | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/vcpu.txt b/Documentation/virtual/kvm/devices/vcpu.txt index 3cc59c5e44ce..c04165868faf 100644 --- a/Documentation/virtual/kvm/devices/vcpu.txt +++ b/Documentation/virtual/kvm/devices/vcpu.txt @@ -6,3 +6,28 @@ 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 + +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 + -ENXIO: PMUv3 not properly configured as required prior to calling this + attribute + -EBUSY: PMUv3 already initialized + +Request the initialization of the PMUv3. |