[PATCH v3 5/8] KVM: arm64: Support pvlock preempted via shared structure
From: Zengruan Ye
Date: Thu Jan 16 2020 - 07:47:28 EST
Implement the service call for configuring a shared structure between a
vCPU and the hypervisor in which the hypervisor can tell the vCPU that is
running or not.
Signed-off-by: Zengruan Ye <yezengruan@xxxxxxxxxx>
---
arch/arm/include/asm/kvm_host.h | 18 +++++++++++++
arch/arm64/include/asm/kvm_host.h | 18 +++++++++++++
arch/arm64/kvm/Makefile | 1 +
virt/kvm/arm/arm.c | 8 ++++++
virt/kvm/arm/hypercalls.c | 17 ++++++++++++
virt/kvm/arm/pvlock.c | 45 +++++++++++++++++++++++++++++++
6 files changed, 107 insertions(+)
create mode 100644 virt/kvm/arm/pvlock.c
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 556cd818eccf..dfeaf9204875 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -356,6 +356,24 @@ static inline bool kvm_arm_is_pvtime_enabled(struct kvm_vcpu_arch *vcpu_arch)
return false;
}
+static inline void kvm_arm_pvlock_preempted_init(struct kvm_vcpu_arch *vcpu_arch)
+{
+}
+
+static inline bool kvm_arm_is_pvlock_preempted_ready(struct kvm_vcpu_arch *vcpu_arch)
+{
+ return false;
+}
+
+static inline gpa_t kvm_init_pvlock(struct kvm_vcpu *vcpu)
+{
+ return GPA_INVALID;
+}
+
+static inline void kvm_update_pvlock_preempted(struct kvm_vcpu *vcpu, u64 preempted)
+{
+}
+
void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index c61260cf63c5..10f8c4bbf97e 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -354,6 +354,11 @@ struct kvm_vcpu_arch {
u64 last_steal;
gpa_t base;
} steal;
+
+ /* Guest PV lock state */
+ struct {
+ gpa_t base;
+ } pv;
};
/* Pointer to the vcpu's SVE FFR for sve_{save,load}_state() */
@@ -515,6 +520,19 @@ static inline bool kvm_arm_is_pvtime_enabled(struct kvm_vcpu_arch *vcpu_arch)
return (vcpu_arch->steal.base != GPA_INVALID);
}
+static inline void kvm_arm_pvlock_preempted_init(struct kvm_vcpu_arch *vcpu_arch)
+{
+ vcpu_arch->pv.base = GPA_INVALID;
+}
+
+static inline bool kvm_arm_is_pvlock_preempted_ready(struct kvm_vcpu_arch *vcpu_arch)
+{
+ return (vcpu_arch->pv.base != GPA_INVALID);
+}
+
+gpa_t kvm_init_pvlock(struct kvm_vcpu *vcpu);
+void kvm_update_pvlock_preempted(struct kvm_vcpu *vcpu, u64 preempted);
+
void kvm_set_sei_esr(struct kvm_vcpu *vcpu, u64 syndrome);
struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index 5ffbdc39e780..e4591f56d5f1 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile
@@ -15,6 +15,7 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/arm.o $(KVM)/arm/mmu.o $(KVM)/arm/mmio.
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/psci.o $(KVM)/arm/perf.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hypercalls.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/pvtime.o
+kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/pvlock.o
kvm-$(CONFIG_KVM_ARM_HOST) += inject_fault.o regmap.o va_layout.o
kvm-$(CONFIG_KVM_ARM_HOST) += hyp.o hyp-init.o handle_exit.o
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 8de4daf25097..36d57e77d3c4 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -383,6 +383,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
kvm_arm_pvtime_vcpu_init(&vcpu->arch);
+ kvm_arm_pvlock_preempted_init(&vcpu->arch);
+
return kvm_vgic_vcpu_init(vcpu);
}
@@ -421,6 +423,9 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
vcpu_set_wfx_traps(vcpu);
vcpu_ptrauth_setup_lazy(vcpu);
+
+ if (kvm_arm_is_pvlock_preempted_ready(&vcpu->arch))
+ kvm_update_pvlock_preempted(vcpu, 0);
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
@@ -434,6 +439,9 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
vcpu->cpu = -1;
kvm_arm_set_running_vcpu(NULL);
+
+ if (kvm_arm_is_pvlock_preempted_ready(&vcpu->arch))
+ kvm_update_pvlock_preempted(vcpu, 1);
}
static void vcpu_power_off(struct kvm_vcpu *vcpu)
diff --git a/virt/kvm/arm/hypercalls.c b/virt/kvm/arm/hypercalls.c
index bdbab9ef6d2d..7f90b413641c 100644
--- a/virt/kvm/arm/hypercalls.c
+++ b/virt/kvm/arm/hypercalls.c
@@ -72,6 +72,23 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
break;
case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
val[0] = BIT(ARM_SMCCC_KVM_FUNC_FEATURES);
+ if (!vcpu_el1_is_32bit(vcpu))
+ val[0] |= BIT(ARM_SMCCC_KVM_FUNC_PV_LOCK);
+ break;
+ case ARM_SMCCC_VENDOR_HYP_KVM_PV_LOCK_FUNC_ID:
+ if (vcpu_el1_is_32bit(vcpu))
+ break;
+ option = smccc_get_arg1(vcpu);
+ switch (option) {
+ case KVM_PV_LOCK_FEATURES:
+ val[0] = SMCCC_RET_SUCCESS;
+ break;
+ case KVM_PV_LOCK_PREEMPTED:
+ gpa = kvm_init_pvlock(vcpu);
+ if (gpa != GPA_INVALID)
+ val[0] = gpa;
+ break;
+ }
break;
default:
return kvm_psci_call(vcpu);
diff --git a/virt/kvm/arm/pvlock.c b/virt/kvm/arm/pvlock.c
new file mode 100644
index 000000000000..0644b23be51e
--- /dev/null
+++ b/virt/kvm/arm/pvlock.c
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright(c) 2019 Huawei Technologies Co., Ltd
+ * Author: Zengruan Ye <yezengruan@xxxxxxxxxx>
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/kvm_host.h>
+
+#include <asm/pvlock-abi.h>
+
+#include <kvm/arm_hypercalls.h>
+
+gpa_t kvm_init_pvlock(struct kvm_vcpu *vcpu)
+{
+ struct pvlock_vcpu_state init_values = {};
+ struct kvm *kvm = vcpu->kvm;
+ u64 base = vcpu->arch.pv.base;
+ int idx;
+
+ if (base == GPA_INVALID)
+ return base;
+
+ idx = srcu_read_lock(&kvm->srcu);
+ kvm_write_guest(kvm, base, &init_values, sizeof(init_values));
+ srcu_read_unlock(&kvm->srcu, idx);
+
+ return base;
+}
+
+void kvm_update_pvlock_preempted(struct kvm_vcpu *vcpu, u64 preempted)
+{
+ int idx;
+ u64 offset;
+ __le64 preempted_le;
+ struct kvm *kvm = vcpu->kvm;
+ u64 base = vcpu->arch.pv.base;
+
+ preempted_le = cpu_to_le64(preempted);
+
+ idx = srcu_read_lock(&kvm->srcu);
+ offset = offsetof(struct pvlock_vcpu_state, preempted);
+ kvm_put_guest(kvm, base + offset, preempted_le, u64);
+ srcu_read_unlock(&kvm->srcu, idx);
+}
--
2.19.1