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arm/arm64: KVM: Add smccc accessors to PSCI code

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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>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Marc Zyngier 2018-02-06 17:56:10 +00:00 committed by Catalin Marinas
parent d0a144f12a
commit 84684fecd7
1 changed files with 42 additions and 10 deletions
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52
virt/kvm/arm/psci.c
View File

@ -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;
}