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RISC-V: KVM: add SBI extension init()/deinit() functions

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The FWFT SBI extension will need to dynamically allocate memory and do
init time specific initialization. Add an init/deinit callbacks that
allows to do so.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20250523101932.1594077-12-cleger@rivosinc.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Clément Léger
2025-05-23 12:19:28 +02:00
committed by Anup Patel
parent 4cec89db80
commit cf648c400f
3 changed files with 37 additions and 0 deletions
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9
arch/riscv/include/asm/kvm_vcpu_sbi.h
View File

@@ -49,6 +49,14 @@ struct kvm_vcpu_sbi_extension {
/* Extension specific probe function */
unsigned long (*probe)(struct kvm_vcpu *vcpu);
/*
* Init/deinit function called once during VCPU init/destroy. These
* might be use if the SBI extensions need to allocate or do specific
* init time only configuration.
*/
int (*init)(struct kvm_vcpu *vcpu);
void (*deinit)(struct kvm_vcpu *vcpu);
};
void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run);
@@ -72,6 +80,7 @@ const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(
bool riscv_vcpu_supports_sbi_ext(struct kvm_vcpu *vcpu, int idx);
int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run);
void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu);
void kvm_riscv_vcpu_sbi_deinit(struct kvm_vcpu *vcpu);
int kvm_riscv_vcpu_get_reg_sbi_sta(struct kvm_vcpu *vcpu, unsigned long reg_num,
unsigned long *reg_val);

2
arch/riscv/kvm/vcpu.c
View File

@@ -187,6 +187,8 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
kvm_riscv_vcpu_sbi_deinit(vcpu);
/* Cleanup VCPU AIA context */
kvm_riscv_vcpu_aia_deinit(vcpu);

26
arch/riscv/kvm/vcpu_sbi.c
View File

@@ -536,5 +536,31 @@ void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu)
scontext->ext_status[idx] = ext->default_disabled ?
KVM_RISCV_SBI_EXT_STATUS_DISABLED :
KVM_RISCV_SBI_EXT_STATUS_ENABLED;
if (ext->init && ext->init(vcpu) != 0)
scontext->ext_status[idx] = KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE;
}
}
void kvm_riscv_vcpu_sbi_deinit(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_sbi_context *scontext = &vcpu->arch.sbi_context;
const struct kvm_riscv_sbi_extension_entry *entry;
const struct kvm_vcpu_sbi_extension *ext;
int idx, i;
for (i = 0; i < ARRAY_SIZE(sbi_ext); i++) {
entry = &sbi_ext[i];
ext = entry->ext_ptr;
idx = entry->ext_idx;
if (idx < 0 || idx >= ARRAY_SIZE(scontext->ext_status))
continue;
if (scontext->ext_status[idx] == KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE ||
!ext->deinit)
continue;
ext->deinit(vcpu);
}
}