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ARM/ARM64: KVM: Add base for PSCI v0.2 emulation

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Currently, the in-kernel PSCI emulation provides PSCI v0.1 interface to
VCPUs. This patch extends current in-kernel PSCI emulation to provide
PSCI v0.2 interface to VCPUs.

By default, ARM/ARM64 KVM will always provide PSCI v0.1 interface for
keeping the ABI backward-compatible.

To select PSCI v0.2 interface for VCPUs, the user space (i.e. QEMU or
KVMTOOL) will have to set KVM_ARM_VCPU_PSCI_0_2 feature when doing VCPU
init using KVM_ARM_VCPU_INIT ioctl.

Signed-off-by: Anup Patel <anup.patel@linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Anup Patel 2014-04-29 11:24:16 +05:30 • committed by Christoffer Dall
parent e546eea74e
commit 7d0f84aae9
7 changed files with 105 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

105
arch/arm/kvm/psci.c
View file

@ -59,7 +59,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
* turned off.
*/
if (!vcpu || !vcpu->arch.pause)
return KVM_PSCI_RET_INVAL;
return PSCI_RET_INVALID_PARAMS;
target_pc = *vcpu_reg(source_vcpu, 2);
@ -82,7 +82,82 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
wq = kvm_arch_vcpu_wq(vcpu);
wake_up_interruptible(wq);
return KVM_PSCI_RET_SUCCESS;
return PSCI_RET_SUCCESS;
}
int kvm_psci_version(struct kvm_vcpu *vcpu)
{
if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features))
return KVM_ARM_PSCI_0_2;
return KVM_ARM_PSCI_0_1;
}
static bool kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
{
unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0);
unsigned long val;
switch (psci_fn) {
case PSCI_0_2_FN_PSCI_VERSION:
/*
* Bits[31:16] = Major Version = 0
* Bits[15:0] = Minor Version = 2
*/
val = 2;
break;
case PSCI_0_2_FN_CPU_OFF:
kvm_psci_vcpu_off(vcpu);
val = PSCI_RET_SUCCESS;
break;
case PSCI_0_2_FN_CPU_ON:
case PSCI_0_2_FN64_CPU_ON:
val = kvm_psci_vcpu_on(vcpu);
break;
case PSCI_0_2_FN_CPU_SUSPEND:
case PSCI_0_2_FN_AFFINITY_INFO:
case PSCI_0_2_FN_MIGRATE:
case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
case PSCI_0_2_FN_MIGRATE_INFO_UP_CPU:
case PSCI_0_2_FN_SYSTEM_OFF:
case PSCI_0_2_FN_SYSTEM_RESET:
case PSCI_0_2_FN64_CPU_SUSPEND:
case PSCI_0_2_FN64_AFFINITY_INFO:
case PSCI_0_2_FN64_MIGRATE:
case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
val = PSCI_RET_NOT_SUPPORTED;
break;
default:
return false;
}
*vcpu_reg(vcpu, 0) = val;
return true;
}
static bool kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
{
unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0);
unsigned long val;
switch (psci_fn) {
case KVM_PSCI_FN_CPU_OFF:
kvm_psci_vcpu_off(vcpu);
val = PSCI_RET_SUCCESS;
break;
case KVM_PSCI_FN_CPU_ON:
val = kvm_psci_vcpu_on(vcpu);
break;
case KVM_PSCI_FN_CPU_SUSPEND:
case KVM_PSCI_FN_MIGRATE:
val = PSCI_RET_NOT_SUPPORTED;
break;
default:
return false;
}
*vcpu_reg(vcpu, 0) = val;
return true;
}
/**
@ -97,26 +172,12 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
*/
bool kvm_psci_call(struct kvm_vcpu *vcpu)
{
unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0);
unsigned long val;
switch (psci_fn) {
case KVM_PSCI_FN_CPU_OFF:
kvm_psci_vcpu_off(vcpu);
val = KVM_PSCI_RET_SUCCESS;
break;
case KVM_PSCI_FN_CPU_ON:
val = kvm_psci_vcpu_on(vcpu);
break;
case KVM_PSCI_FN_CPU_SUSPEND:
case KVM_PSCI_FN_MIGRATE:
val = KVM_PSCI_RET_NI;
break;
switch (kvm_psci_version(vcpu)) {
case KVM_ARM_PSCI_0_2:
return kvm_psci_0_2_call(vcpu);
case KVM_ARM_PSCI_0_1:
return kvm_psci_0_1_call(vcpu);
default:
return false;
}
*vcpu_reg(vcpu, 0) = val;
return true;
};
}