From a2befacf50940017e0de8461c4b924a929c4edc5 Mon Sep 17 00:00:00 2001 From: Christoffer Dall Date: Tue, 2 May 2017 13:41:02 +0200 Subject: KVM: arm64: Allow creating the PMU without the in-kernel GIC Since we got support for devices in userspace which allows reporting the PMU overflow output status to userspace, we should actually allow creating the PMU on systems without an in-kernel irqchip, which in turn requires us to slightly clarify error codes for the ABI and move things around for the initialization phase. Signed-off-by: Christoffer Dall Reviewed-by: Marc Zyngier --- Documentation/virtual/kvm/devices/vcpu.txt | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) (limited to 'Documentation/virtual/kvm/devices') diff --git a/Documentation/virtual/kvm/devices/vcpu.txt b/Documentation/virtual/kvm/devices/vcpu.txt index 02f50686c418..d7236a3e01dc 100644 --- a/Documentation/virtual/kvm/devices/vcpu.txt +++ b/Documentation/virtual/kvm/devices/vcpu.txt @@ -16,7 +16,9 @@ Parameters: in kvm_device_attr.addr the address for PMU overflow interrupt is a 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 + -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 @@ -25,11 +27,11 @@ 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 +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. This must be done after creating the -in-kernel irqchip. Creating a PMU with a userspace irqchip is currently not -supported. +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. -- cgit v1.2.3 From 99a1db7a2c9b2ecb9a801cee3f6a7a71945a2fca Mon Sep 17 00:00:00 2001 From: Christoffer Dall Date: Tue, 2 May 2017 20:19:15 +0200 Subject: KVM: arm/arm64: Allow setting the timer IRQ numbers from userspace First we define an ABI using the vcpu devices that lets userspace set the interrupt numbers for the various timers on both the 32-bit and 64-bit KVM/ARM implementations. Second, we add the definitions for the groups and attributes introduced by the above ABI. (We add the PMU define on the 32-bit side as well for symmetry and it may get used some day.) Third, we set up the arch-specific vcpu device operation handlers to call into the timer code for anything related to the KVM_ARM_VCPU_TIMER_CTRL group. Fourth, we implement support for getting and setting the timer interrupt numbers using the above defined ABI in the arch timer code. Fifth, we introduce error checking upon enabling the arch timer (which is called when first running a VCPU) to check that all VCPUs are configured to use the same PPI for the timer (as mandated by the architecture) and that the virtual and physical timers are not configured to use the same IRQ number. Signed-off-by: Christoffer Dall Reviewed-by: Marc Zyngier --- Documentation/virtual/kvm/devices/vcpu.txt | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'Documentation/virtual/kvm/devices') diff --git a/Documentation/virtual/kvm/devices/vcpu.txt b/Documentation/virtual/kvm/devices/vcpu.txt index d7236a3e01dc..2b5dab16c4f2 100644 --- a/Documentation/virtual/kvm/devices/vcpu.txt +++ b/Documentation/virtual/kvm/devices/vcpu.txt @@ -35,3 +35,28 @@ Returns: -ENODEV: PMUv3 not supported or GIC not 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. ATTRIBUTE: KVM_ARM_VCPU_TIMER_IRQ_VTIMER +2.2. ATTRIBUTE: 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. -- cgit v1.2.3