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| author | Anup Patel <anup.patel@linaro.org> | 2014-04-29 09:54:23 +0400 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2014-04-30 15:18:58 +0400 |
| commit | aa8aeefe5e567637bbec7d7a3031cc057e3af303 (patch) | |
| tree | 456989d612026d8cc55aa2171143e29b1cfbe08a /arch/arm | |
| parent | bab0b43012a8ad64877fa46134370a7f5c6ce861 (diff) | |
| download | linux-aa8aeefe5e567637bbec7d7a3031cc057e3af303.tar.xz | |
ARM/ARM64: KVM: Fix CPU_ON emulation for PSCI v0.2
As-per PSCI v0.2, the source CPU provides physical address of
"entry point" and "context id" for starting a target CPU. Also,
if target CPU is already running then we should return ALREADY_ON.
Current emulation of CPU_ON function does not consider physical
address of "context id" and returns INVALID_PARAMETERS if target
CPU is already running.
This patch updates kvm_psci_vcpu_on() such that it works for both
PSCI v0.1 and PSCI v0.2.
Signed-off-by: Anup Patel <anup.patel@linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/kvm/psci.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c index cce901a510fa..1067579c7336 100644 --- a/arch/arm/kvm/psci.c +++ b/arch/arm/kvm/psci.c @@ -48,6 +48,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu) struct kvm_vcpu *vcpu = NULL, *tmp; wait_queue_head_t *wq; unsigned long cpu_id; + unsigned long context_id; unsigned long mpidr; phys_addr_t target_pc; int i; @@ -68,10 +69,17 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu) * Make sure the caller requested a valid CPU and that the CPU is * turned off. */ - if (!vcpu || !vcpu->arch.pause) + if (!vcpu) return PSCI_RET_INVALID_PARAMS; + if (!vcpu->arch.pause) { + if (kvm_psci_version(source_vcpu) != KVM_ARM_PSCI_0_1) + return PSCI_RET_ALREADY_ON; + else + return PSCI_RET_INVALID_PARAMS; + } target_pc = *vcpu_reg(source_vcpu, 2); + context_id = *vcpu_reg(source_vcpu, 3); kvm_reset_vcpu(vcpu); @@ -86,6 +94,11 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu) kvm_vcpu_set_be(vcpu); *vcpu_pc(vcpu) = target_pc; + /* + * NOTE: We always update r0 (or x0) because for PSCI v0.1 + * the general puspose registers are undefined upon CPU_ON. + */ + *vcpu_reg(vcpu, 0) = context_id; vcpu->arch.pause = false; smp_mb(); /* Make sure the above is visible */ |