In its implementation of the PSCI function, KVM needs to request that a
target vCPU resets before its next entry into the guest. Wrap the logic
for requesting a reset in a function for later use by other implemented
PSCI calls.
No functional change intended.
Signed-off-by: Oliver Upton <oup...@google.com>
---
arch/arm64/kvm/psci.c | 59 +++++++++++++++++++++++++------------------
1 file changed, 35 insertions(+), 24 deletions(-)
diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c
index 310b9cb2b32b..bb59b692998b 100644
--- a/arch/arm64/kvm/psci.c
+++ b/arch/arm64/kvm/psci.c
@@ -64,9 +64,40 @@ static inline bool kvm_psci_valid_affinity(unsigned long
affinity)
return !(affinity & ~MPIDR_HWID_BITMASK);
}
-static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
+static void kvm_psci_vcpu_request_reset(struct kvm_vcpu *vcpu,
+ unsigned long entry_addr,
+ unsigned long context_id,
+ bool big_endian)
{
struct vcpu_reset_state *reset_state;
+
+ lockdep_assert_held(&vcpu->kvm->lock);
+
+ reset_state = &vcpu->arch.reset_state;
+ reset_state->pc = entry_addr;
+
+ /* Propagate caller endianness */
+ reset_state->be = big_endian;
+
+ /*
+ * NOTE: We always update r0 (or x0) because for PSCI v0.1
+ * the general purpose registers are undefined upon CPU_ON.
+ */
+ reset_state->r0 = context_id;
+
+ WRITE_ONCE(reset_state->reset, true);
+ kvm_make_request(KVM_REQ_VCPU_RESET, vcpu);
+
+ /*
+ * Make sure the reset request is observed if the change to
+ * power_state is observed.
+ */
+ smp_wmb();
+ vcpu->arch.power_off = false;
+}
+
+static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
+{
struct kvm *kvm = source_vcpu->kvm;
struct kvm_vcpu *vcpu = NULL;
unsigned long cpu_id;
@@ -90,29 +121,9 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu
*source_vcpu)
return PSCI_RET_INVALID_PARAMS;
}
- reset_state = &vcpu->arch.reset_state;
-
- reset_state->pc = smccc_get_arg2(source_vcpu);
-
- /* Propagate caller endianness */
- reset_state->be = kvm_vcpu_is_be(source_vcpu);
-
- /*
- * NOTE: We always update r0 (or x0) because for PSCI v0.1
- * the general purpose registers are undefined upon CPU_ON.
- */
- reset_state->r0 = smccc_get_arg3(source_vcpu);
-
- WRITE_ONCE(reset_state->reset, true);
- kvm_make_request(KVM_REQ_VCPU_RESET, vcpu);
-
- /*
- * Make sure the reset request is observed if the change to
- * power_state is observed.
- */
- smp_wmb();
-
- vcpu->arch.power_off = false;
+ kvm_psci_vcpu_request_reset(vcpu, smccc_get_arg2(source_vcpu),
+ smccc_get_arg3(source_vcpu),
+ kvm_vcpu_is_be(source_vcpu));
kvm_vcpu_wake_up(vcpu);
return PSCI_RET_SUCCESS;
--
2.33.0.685.g46640cef36-goog
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