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Subject[PATCH v4 06/17] arm/arm64: KVM: Add smccc accessors to PSCI code
Date
Instead of open coding the accesses to the various registers,
let's add explicit SMCCC accessors.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@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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