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SubjectRe: [PATCH v3 06/18] arm/arm64: KVM: Add smccc accessors to PSCI code
On Thu, Feb 01, 2018 at 11:46:45AM +0000, Marc Zyngier wrote:
> Instead of open coding the accesses to the various registers,
> let's add explicit SMCCC accessors.
>

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>

> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
> virt/kvm/arm/psci.c | 52 ++++++++++++++++++++++++++++++++++++++++++----------
> 1 file changed, 42 insertions(+), 10 deletions(-)
>
> diff --git a/virt/kvm/arm/psci.c b/virt/kvm/arm/psci.c
> index 999f94d6bb98..c41553d35110 100644
> --- a/virt/kvm/arm/psci.c
> +++ b/virt/kvm/arm/psci.c
> @@ -32,6 +32,38 @@
>
> #define AFFINITY_MASK(level) ~((0x1UL << ((level) * MPIDR_LEVEL_BITS)) - 1)
>
> +static u32 smccc_get_function(struct kvm_vcpu *vcpu)
> +{
> + return vcpu_get_reg(vcpu, 0);
> +}
> +
> +static unsigned long smccc_get_arg1(struct kvm_vcpu *vcpu)
> +{
> + return vcpu_get_reg(vcpu, 1);
> +}
> +
> +static unsigned long smccc_get_arg2(struct kvm_vcpu *vcpu)
> +{
> + return vcpu_get_reg(vcpu, 2);
> +}
> +
> +static unsigned long smccc_get_arg3(struct kvm_vcpu *vcpu)
> +{
> + return vcpu_get_reg(vcpu, 3);
> +}
> +
> +static void smccc_set_retval(struct kvm_vcpu *vcpu,
> + unsigned long a0,
> + unsigned long a1,
> + unsigned long a2,
> + unsigned long a3)
> +{
> + vcpu_set_reg(vcpu, 0, a0);
> + vcpu_set_reg(vcpu, 1, a1);
> + vcpu_set_reg(vcpu, 2, a2);
> + vcpu_set_reg(vcpu, 3, a3);
> +}
> +
> static unsigned long psci_affinity_mask(unsigned long affinity_level)
> {
> if (affinity_level <= 3)
> @@ -77,7 +109,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
> unsigned long context_id;
> phys_addr_t target_pc;
>
> - cpu_id = vcpu_get_reg(source_vcpu, 1) & MPIDR_HWID_BITMASK;
> + cpu_id = smccc_get_arg1(source_vcpu) & MPIDR_HWID_BITMASK;
> if (vcpu_mode_is_32bit(source_vcpu))
> cpu_id &= ~((u32) 0);
>
> @@ -96,8 +128,8 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
> return PSCI_RET_INVALID_PARAMS;
> }
>
> - target_pc = vcpu_get_reg(source_vcpu, 2);
> - context_id = vcpu_get_reg(source_vcpu, 3);
> + target_pc = smccc_get_arg2(source_vcpu);
> + context_id = smccc_get_arg3(source_vcpu);
>
> kvm_reset_vcpu(vcpu);
>
> @@ -116,7 +148,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
> * NOTE: We always update r0 (or x0) because for PSCI v0.1
> * the general puspose registers are undefined upon CPU_ON.
> */
> - vcpu_set_reg(vcpu, 0, context_id);
> + smccc_set_retval(vcpu, context_id, 0, 0, 0);
> vcpu->arch.power_off = false;
> smp_mb(); /* Make sure the above is visible */
>
> @@ -136,8 +168,8 @@ static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
> struct kvm *kvm = vcpu->kvm;
> struct kvm_vcpu *tmp;
>
> - target_affinity = vcpu_get_reg(vcpu, 1);
> - lowest_affinity_level = vcpu_get_reg(vcpu, 2);
> + target_affinity = smccc_get_arg1(vcpu);
> + lowest_affinity_level = smccc_get_arg2(vcpu);
>
> /* Determine target affinity mask */
> target_affinity_mask = psci_affinity_mask(lowest_affinity_level);
> @@ -210,7 +242,7 @@ int kvm_psci_version(struct kvm_vcpu *vcpu)
> static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
> {
> struct kvm *kvm = vcpu->kvm;
> - unsigned long psci_fn = vcpu_get_reg(vcpu, 0) & ~((u32) 0);
> + u32 psci_fn = smccc_get_function(vcpu);
> unsigned long val;
> int ret = 1;
>
> @@ -277,14 +309,14 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
> break;
> }
>
> - vcpu_set_reg(vcpu, 0, val);
> + smccc_set_retval(vcpu, val, 0, 0, 0);
> return ret;
> }
>
> static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
> {
> struct kvm *kvm = vcpu->kvm;
> - unsigned long psci_fn = vcpu_get_reg(vcpu, 0) & ~((u32) 0);
> + u32 psci_fn = smccc_get_function(vcpu);
> unsigned long val;
>
> switch (psci_fn) {
> @@ -302,7 +334,7 @@ static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
> break;
> }
>
> - vcpu_set_reg(vcpu, 0, val);
> + smccc_set_retval(vcpu, val, 0, 0, 0);
> return 1;
> }
>
> --
> 2.14.2
>

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