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Message-Id: <20180129174559.1866-6-marc.zyngier@arm.com>
Date: Mon, 29 Jan 2018 17:45:48 +0000
From: Marc Zyngier <marc.zyngier@....com>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
kvmarm@...ts.cs.columbia.edu
Cc: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Peter Maydell <peter.maydell@...aro.org>,
Christoffer Dall <christoffer.dall@...aro.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Mark Rutland <mark.rutland@....com>,
Robin Murphy <robin.murphy@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Jon Masters <jcm@...hat.com>
Subject: [PATCH v2 05/16] arm/arm64: KVM: Add smccc accessors to PSCI code
Instead of open coding the accesses to the various registers,
let's add explicit SMCCC accessors.
Signed-off-by: Marc Zyngier <marc.zyngier@....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 c00bb324e14e..053654082bd4 100644
--- a/virt/kvm/arm/psci.c
+++ b/virt/kvm/arm/psci.c
@@ -34,6 +34,38 @@
#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)
@@ -79,7 +111,7 @@ 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);
@@ -98,8 +130,8 @@ 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);
@@ -118,7 +150,7 @@ 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 */
@@ -138,8 +170,8 @@ 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);
@@ -212,7 +244,7 @@ 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;
@@ -279,14 +311,14 @@ 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) {
@@ -304,7 +336,7 @@ 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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