On Tue, Dec 17, 2019 at 01:55:46PM +0000, [email protected] wrote: > From: Zengruan Ye <[email protected]> > > This provides a mechanism for querying which paravirtualized lock > features are available in this hypervisor. > > Also add the header file which defines the ABI for the paravirtualized > lock features we're about to add. > > Signed-off-by: Zengruan Ye <[email protected]> > --- > arch/arm64/include/asm/pvlock-abi.h | 16 ++++++++++++++++ > include/linux/arm-smccc.h | 13 +++++++++++++ > virt/kvm/arm/hypercalls.c | 3 +++ > 3 files changed, 32 insertions(+) > create mode 100644 arch/arm64/include/asm/pvlock-abi.h > > diff --git a/arch/arm64/include/asm/pvlock-abi.h > b/arch/arm64/include/asm/pvlock-abi.h > new file mode 100644 > index 000000000000..06e0c3d7710a > --- /dev/null > +++ b/arch/arm64/include/asm/pvlock-abi.h > @@ -0,0 +1,16 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright(c) 2019 Huawei Technologies Co., Ltd > + * Author: Zengruan Ye <[email protected]> > + */ > + > +#ifndef __ASM_PVLOCK_ABI_H > +#define __ASM_PVLOCK_ABI_H > + > +struct pvlock_vcpu_state { > + __le64 preempted;
Somewhere we need to document when 'preempted' is. It looks like it's a 1-bit field from the later patches. > + /* Structure must be 64 byte aligned, pad to that size */ > + u8 padding[56]; > +} __packed; > + > +#endif > diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h > index 59494df0f55b..59e65a951959 100644 > --- a/include/linux/arm-smccc.h > +++ b/include/linux/arm-smccc.h > @@ -377,5 +377,18 @@ asmlinkage void __arm_smccc_hvc(unsigned long a0, > unsigned long a1, > ARM_SMCCC_OWNER_STANDARD_HYP, \ > 0x21) > > +/* Paravirtualised lock calls */ > +#define ARM_SMCCC_HV_PV_LOCK_FEATURES \ > + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ > + ARM_SMCCC_SMC_64, \ > + ARM_SMCCC_OWNER_STANDARD_HYP, \ > + 0x40) > + > +#define ARM_SMCCC_HV_PV_LOCK_PREEMPTED \ > + 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 550dfa3e53cd..ff13871fd85a 100644 > --- a/virt/kvm/arm/hypercalls.c > +++ b/virt/kvm/arm/hypercalls.c > @@ -52,6 +52,9 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) > case ARM_SMCCC_HV_PV_TIME_FEATURES: > val = SMCCC_RET_SUCCESS; > break; > + case ARM_SMCCC_HV_PV_LOCK_FEATURES: > + val = SMCCC_RET_SUCCESS; > + break; Ideally you wouldn't report that PV_LOCK_FEATURES exists until the actual hypercalls are wired up to avoid breaking a bisect. Steve > } > break; > case ARM_SMCCC_HV_PV_TIME_FEATURES: > -- > 2.19.1 > > _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
