diff options
| author | Anup Patel <apatel@ventanamicro.com> | 2022-01-31 10:53:13 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2022-03-11 19:02:31 +0530 |
| commit | be78aa8a38c8dc5c9676612c36329441132bccab (patch) | |
| tree | 171418c2adb92850ff3e3de7bc3fc914efa17dd9 | |
| parent | 4b11d86571c44738f5ef12fcfac2ee36f998cf23 (diff) | |
| download | linux-be78aa8a38c8dc5c9676612c36329441132bccab.tar.bz2 | |
RISC-V: KVM: Implement SBI v0.3 SRST extension
The SBI v0.3 specification defines SRST (System Reset) extension which
provides a standard poweroff and reboot interface. This patch implements
SRST extension for the KVM Guest.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
| -rw-r--r-- | arch/riscv/kvm/vcpu_sbi.c | 2 | ||||
| -rw-r--r-- | arch/riscv/kvm/vcpu_sbi_replace.c | 44 |
2 files changed, 46 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c index 11ae4f621f0d..a09ecb97b890 100644 --- a/arch/riscv/kvm/vcpu_sbi.c +++ b/arch/riscv/kvm/vcpu_sbi.c @@ -45,6 +45,7 @@ extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_time; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_ipi; 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_experimental; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor; @@ -55,6 +56,7 @@ static const struct kvm_vcpu_sbi_extension *sbi_ext[] = { &vcpu_sbi_ext_time, &vcpu_sbi_ext_ipi, &vcpu_sbi_ext_rfence, + &vcpu_sbi_ext_srst, &vcpu_sbi_ext_hsm, &vcpu_sbi_ext_experimental, &vcpu_sbi_ext_vendor, diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_replace.c index 1bc0608a5bfd..0f217365c287 100644 --- a/arch/riscv/kvm/vcpu_sbi_replace.c +++ b/arch/riscv/kvm/vcpu_sbi_replace.c @@ -130,3 +130,47 @@ const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence = { .extid_end = SBI_EXT_RFENCE, .handler = kvm_sbi_ext_rfence_handler, }; + +static int kvm_sbi_ext_srst_handler(struct kvm_vcpu *vcpu, + struct kvm_run *run, + unsigned long *out_val, + struct kvm_cpu_trap *utrap, bool *exit) +{ + struct kvm_cpu_context *cp = &vcpu->arch.guest_context; + unsigned long funcid = cp->a6; + u32 reason = cp->a1; + u32 type = cp->a0; + int ret = 0; + + switch (funcid) { + case SBI_EXT_SRST_RESET: + switch (type) { + case SBI_SRST_RESET_TYPE_SHUTDOWN: + kvm_riscv_vcpu_sbi_system_reset(vcpu, run, + KVM_SYSTEM_EVENT_SHUTDOWN, + reason); + *exit = true; + break; + case SBI_SRST_RESET_TYPE_COLD_REBOOT: + case SBI_SRST_RESET_TYPE_WARM_REBOOT: + kvm_riscv_vcpu_sbi_system_reset(vcpu, run, + KVM_SYSTEM_EVENT_RESET, + reason); + *exit = true; + break; + default: + ret = -EOPNOTSUPP; + } + break; + default: + ret = -EOPNOTSUPP; + } + + return ret; +} + +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst = { + .extid_start = SBI_EXT_SRST, + .extid_end = SBI_EXT_SRST, + .handler = kvm_sbi_ext_srst_handler, +}; |