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RISC-V: KVM: Add SBI STA extension skeleton

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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: Anup Patel <anup@brainfault.org>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Andrew Jones
2023-12-20 17:00:17 +01:00
committed by Anup Patel
parent fdf68acccf
commit 5fed84a800
5 changed files with 54 additions and 0 deletions
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1
arch/riscv/include/asm/kvm_vcpu_sbi.h
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@@ -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;

1
arch/riscv/include/uapi/asm/kvm.h
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@@ -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,
};

1
arch/riscv/kvm/Makefile
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@@ -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

4
arch/riscv/kvm/vcpu_sbi.c
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@@ -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,

47
arch/riscv/kvm/vcpu_sbi_sta.c Normal file
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@@ -0,0 +1,47 @@
// 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,
};