Commit a0b95bdf authored by Zengruan Ye's avatar Zengruan Ye Committed by Zheng Zengkai
Browse files

KVM: arm64: Implement PV_SCHED_FEATURES call 



virt inclusion
category: feature
bugzilla: 47624
CVE: NA

--------------------------------

This provides a mechanism for querying which paravirtualized sched
features are available in this hypervisor.

Add some SMCCC compatible hypercalls for PV sched features:
  PV_SCHED_FEATURES:       0xC5000090
  PV_SCHED_IPA_INIT:       0xC5000091
  PV_SCHED_IPA_RELEASE:    0xC5000092

Also add the header file which defines the ABI for the paravirtualized
sched features we're about to add.

Signed-off-by: default avatarZengruan Ye <yezengruan@huawei.com>
Reviewed-by: default avatarZhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent b74edaf6

arch/arm64/include/asm/kvm_host.h

+2 −0
Original line number Diff line number Diff line
@@ -589,6 +589,8 @@ static inline bool kvm_arm_is_pvtime_enabled(struct kvm_vcpu_arch *vcpu_arch) 
	return (vcpu_arch->steal.base != GPA_INVALID);

}



long 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);

arch/arm64/include/asm/pvsched-abi.h

0 → 100644
+16 −0
Original line number Diff line number Diff line 
/* 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

arch/arm64/kvm/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -12,7 +12,7 @@ obj-$(CONFIG_KVM) += hyp/ 


kvm-y := $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o \

	 $(KVM)/vfio.o $(KVM)/irqchip.o \

	 arm.o mmu.o mmio.o psci.o perf.o hypercalls.o pvtime.o \

	 arm.o mmu.o mmio.o psci.o perf.o hypercalls.o pvtime.o pvsched.o \

	 inject_fault.o regmap.o va_layout.o handle_exit.o \

	 guest.o debug.o reset.o sys_regs.o \

	 vgic-sys-reg-v3.o fpsimd.o pmu.o \

arch/arm64/kvm/hypercalls.c

+6 −0
Original line number Diff line number Diff line
@@ -61,6 +61,9 @@ 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_SCHED_FEATURES:

			val = SMCCC_RET_SUCCESS;

			break;

		}

		break;

	case ARM_SMCCC_HV_PV_TIME_FEATURES:
@@ -71,6 +74,9 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) 
		if (gpa != GPA_INVALID)

			val = gpa;

		break;

	case ARM_SMCCC_HV_PV_SCHED_FEATURES:

		val = kvm_hypercall_pvsched_features(vcpu);

		break;

	default:

		return kvm_psci_call(vcpu);

	}

arch/arm64/kvm/pvsched.c

0 → 100644
+23 −0
Original line number Diff line number Diff line 
// 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>



long kvm_hypercall_pvsched_features(struct kvm_vcpu *vcpu)

{

	u32 feature = smccc_get_arg1(vcpu);

	long val = SMCCC_RET_NOT_SUPPORTED;



	switch (feature) {

	case ARM_SMCCC_HV_PV_SCHED_FEATURES:

		val = SMCCC_RET_SUCCESS;

		break;

	}



	return val;

}