Commit 5fed84a8 authored by Andrew Jones's avatar Andrew Jones Committed by Anup Patel
Browse files

RISC-V: KVM: Add SBI STA extension skeleton 



Add the files and functions needed to support the SBI STA
(steal-time accounting) extension. In the next patches we'll
complete the functions to fully enable SBI STA support.

Reviewed-by: default avatarAnup Patel <anup@brainfault.org>
Reviewed-by: default avatarAtish Patra <atishp@rivosinc.com>
Signed-off-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent fdf68acc

arch/riscv/include/asm/kvm_vcpu_sbi.h

+1 −0
Original line number Diff line number Diff line
@@ -76,6 +76,7 @@ extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence; 
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst;

extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_hsm;

extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn;

extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta;

extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental;

extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor;

arch/riscv/include/uapi/asm/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -157,6 +157,7 @@ enum KVM_RISCV_SBI_EXT_ID { 
	KVM_RISCV_SBI_EXT_EXPERIMENTAL,

	KVM_RISCV_SBI_EXT_VENDOR,

	KVM_RISCV_SBI_EXT_DBCN,

	KVM_RISCV_SBI_EXT_STA,

	KVM_RISCV_SBI_EXT_MAX,

};

arch/riscv/kvm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ kvm-$(CONFIG_RISCV_SBI_V01) += vcpu_sbi_v01.o 
kvm-y += vcpu_sbi_base.o

kvm-y += vcpu_sbi_replace.o

kvm-y += vcpu_sbi_hsm.o

kvm-y += vcpu_sbi_sta.o

kvm-y += vcpu_timer.o

kvm-$(CONFIG_RISCV_PMU_SBI) += vcpu_pmu.o vcpu_sbi_pmu.o

kvm-y += aia.o

arch/riscv/kvm/vcpu_sbi.c

+4 −0
Original line number Diff line number Diff line
@@ -70,6 +70,10 @@ static const struct kvm_riscv_sbi_extension_entry sbi_ext[] = { 
		.ext_idx = KVM_RISCV_SBI_EXT_DBCN,

		.ext_ptr = &vcpu_sbi_ext_dbcn,

	},

	{

		.ext_idx = KVM_RISCV_SBI_EXT_STA,

		.ext_ptr = &vcpu_sbi_ext_sta,

	},

	{

		.ext_idx = KVM_RISCV_SBI_EXT_EXPERIMENTAL,

		.ext_ptr = &vcpu_sbi_ext_experimental,

arch/riscv/kvm/vcpu_sbi_sta.c

0 → 100644
+47 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (c) 2023 Ventana Micro Systems Inc.

 */



#include <linux/kvm_host.h>



#include <asm/kvm_vcpu_sbi.h>

#include <asm/sbi.h>



static int kvm_sbi_sta_steal_time_set_shmem(struct kvm_vcpu *vcpu)

{

	return SBI_ERR_FAILURE;

}



static int kvm_sbi_ext_sta_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,

				   struct kvm_vcpu_sbi_return *retdata)

{

	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;

	unsigned long funcid = cp->a6;

	int ret;



	switch (funcid) {

	case SBI_EXT_STA_STEAL_TIME_SET_SHMEM:

		ret = kvm_sbi_sta_steal_time_set_shmem(vcpu);

		break;

	default:

		ret = SBI_ERR_NOT_SUPPORTED;

		break;

	}



	retdata->err_val = ret;



	return 0;

}



static unsigned long kvm_sbi_ext_sta_probe(struct kvm_vcpu *vcpu)

{

	return 0;

}



const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta = {

	.extid_start = SBI_EXT_STA,

	.extid_end = SBI_EXT_STA,

	.handler = kvm_sbi_ext_sta_handler,

	.probe = kvm_sbi_ext_sta_probe,

};