diff options
| author | Anup Patel <apatel@ventanamicro.com> | 2022-01-31 12:31:36 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2022-03-11 19:02:39 +0530 |
| commit | 763c8bed8c05ffcce8cba882e69cd6b03df07019 (patch) | |
| tree | 226370dd933638d7bf8f754aa0c59f853707255f /arch/riscv | |
| parent | c9d3b5bd2693a17f078b1d8bdca440db5baa458c (diff) | |
| download | linux-763c8bed8c05ffcce8cba882e69cd6b03df07019.tar.bz2 | |
RISC-V: KVM: Implement SBI HSM suspend call
The SBI v0.3 specification extends SBI HSM extension by adding SBI HSM
suspend call and related HART states. This patch extends the KVM RISC-V
HSM implementation to provide KVM guest a minimal SBI HSM suspend call
which is equivalent to a WFI instruction.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/kvm/vcpu_sbi_hsm.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu_sbi_hsm.c b/arch/riscv/kvm/vcpu_sbi_hsm.c index 1ac4b2e8e4ec..239dec0a628a 100644 --- a/arch/riscv/kvm/vcpu_sbi_hsm.c +++ b/arch/riscv/kvm/vcpu_sbi_hsm.c @@ -61,6 +61,8 @@ static int kvm_sbi_hsm_vcpu_get_status(struct kvm_vcpu *vcpu) return -EINVAL; if (!target_vcpu->arch.power_off) return SBI_HSM_STATE_STARTED; + else if (vcpu->stat.generic.blocking) + return SBI_HSM_STATE_SUSPENDED; else return SBI_HSM_STATE_STOPPED; } @@ -91,6 +93,18 @@ static int kvm_sbi_ext_hsm_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, ret = 0; } break; + case SBI_EXT_HSM_HART_SUSPEND: + switch (cp->a0) { + case SBI_HSM_SUSPEND_RET_DEFAULT: + kvm_riscv_vcpu_wfi(vcpu); + break; + case SBI_HSM_SUSPEND_NON_RET_DEFAULT: + ret = -EOPNOTSUPP; + break; + default: + ret = -EINVAL; + } + break; default: ret = -EOPNOTSUPP; } |