euleros inclusion category: feature bugzilla: NA DTS: NA CVE: NA
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This provides a mechanism for querying which paravirtualized sched features are available in this hypervisor.
Add two new SMCCC compatible hypercalls for PV sched features: PV_SCHED_FEATURES: 0xC5000040 PV_SCHED_IPA: 0xC5000041
Also add the header file which defines the ABI for the paravirtualized sched features we're about to add.
Signed-off-by: Zengruan Ye yezengruan@huawei.com --- arch/arm/include/asm/kvm_host.h | 6 ++++++ arch/arm64/include/asm/kvm_host.h | 2 ++ arch/arm64/include/asm/pvsched-abi.h | 16 ++++++++++++++++ arch/arm64/kvm/Makefile | 1 + include/linux/arm-smccc.h | 14 ++++++++++++++ virt/kvm/arm/hypercalls.c | 6 ++++++ virt/kvm/arm/pvsched.c | 23 +++++++++++++++++++++++ 7 files changed, 68 insertions(+) create mode 100644 arch/arm64/include/asm/pvsched-abi.h create mode 100644 virt/kvm/arm/pvsched.c
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 661bd0344..8f9a966a7 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -19,6 +19,7 @@ #ifndef __ARM_KVM_HOST_H__ #define __ARM_KVM_HOST_H__
+#include <linux/arm-smccc.h> #include <linux/types.h> #include <linux/kvm_types.h> #include <asm/cputype.h> @@ -302,6 +303,11 @@ static inline int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext) int kvm_perf_init(void); int kvm_perf_teardown(void);
+static inline int kvm_hypercall_pvsched_features(struct kvm_vcpu *vcpu) +{ + return SMCCC_RET_NOT_SUPPORTED; +} + 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 62b6d0447..00662362b 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -409,6 +409,8 @@ void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run, int kvm_perf_init(void); int kvm_perf_teardown(void);
+int kvm_hypercall_pvsched_features(struct kvm_vcpu *vcpu); + 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/include/asm/pvsched-abi.h b/arch/arm64/include/asm/pvsched-abi.h new file mode 100644 index 000000000..80e50e7a1 --- /dev/null +++ b/arch/arm64/include/asm/pvsched-abi.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright(c) 2019 Huawei Technologies Co., Ltd + * Author: Zengruan Ye yezengruan@huawei.com + */ + +#ifndef __ASM_PVSCHED_ABI_H +#define __ASM_PVSCHED_ABI_H + +struct pvsched_vcpu_state { + __le32 preempted; + /* Structure must be 64 byte aligned, pad to that size */ + u8 padding[60]; +} __packed; + +#endif diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile index d17040add..258f9fd91 100644 --- a/arch/arm64/kvm/Makefile +++ b/arch/arm64/kvm/Makefile @@ -16,6 +16,7 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/e kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/arm.o $(KVM)/arm/mmu.o $(KVM)/arm/mmio.o kvm-$(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) += $(KVM)/arm/pvsched.o
kvm-$(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/include/linux/arm-smccc.h b/include/linux/arm-smccc.h index 78b5fc59b..159189b3a 100644 --- a/include/linux/arm-smccc.h +++ b/include/linux/arm-smccc.h @@ -54,6 +54,7 @@ #define ARM_SMCCC_OWNER_SIP 2 #define ARM_SMCCC_OWNER_OEM 3 #define ARM_SMCCC_OWNER_STANDARD 4 +#define ARM_SMCCC_OWNER_STANDARD_HYP 5 #define ARM_SMCCC_OWNER_TRUSTED_APP 48 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49 #define ARM_SMCCC_OWNER_TRUSTED_OS 50 @@ -356,5 +357,18 @@ asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1, method; \ })
+/* Paravirtualised sched calls */ +#define ARM_SMCCC_HV_PV_SCHED_FEATURES \ + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ + ARM_SMCCC_SMC_64, \ + ARM_SMCCC_OWNER_STANDARD_HYP, \ + 0x40) + +#define ARM_SMCCC_HV_PV_SCHED_IPA \ + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ + ARM_SMCCC_SMC_64, \ + ARM_SMCCC_OWNER_STANDARD_HYP, \ + 0x41) + #endif /*__ASSEMBLY__*/ #endif /*__LINUX_ARM_SMCCC_H*/ diff --git a/virt/kvm/arm/hypercalls.c b/virt/kvm/arm/hypercalls.c index 738df465b..780240bde 100644 --- a/virt/kvm/arm/hypercalls.c +++ b/virt/kvm/arm/hypercalls.c @@ -40,8 +40,14 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) break; } break; + case ARM_SMCCC_HV_PV_SCHED_FEATURES: + val = SMCCC_RET_SUCCESS; + break; } break; + case ARM_SMCCC_HV_PV_SCHED_FEATURES: + val = kvm_hypercall_pvsched_features(vcpu); + break; default: return kvm_psci_call(vcpu); } diff --git a/virt/kvm/arm/pvsched.c b/virt/kvm/arm/pvsched.c new file mode 100644 index 000000000..40b56e01f --- /dev/null +++ b/virt/kvm/arm/pvsched.c @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright(c) 2019 Huawei Technologies Co., Ltd + * Author: Zengruan Ye yezengruan@huawei.com + */ + +#include <linux/arm-smccc.h> + +#include <kvm/arm_hypercalls.h> + +int kvm_hypercall_pvsched_features(struct kvm_vcpu *vcpu) +{ + u32 feature = smccc_get_arg1(vcpu); + int val = SMCCC_RET_NOT_SUPPORTED; + + switch (feature) { + case ARM_SMCCC_HV_PV_SCHED_FEATURES: + val = SMCCC_RET_SUCCESS; + break; + } + + return val; +}