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RISC-V: KVM: Implement SBI v0.3 SRST extension

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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>
This commit is contained in:
Anup Patel 2022-01-31 10:53:13 +05:30 committed by Anup Patel
parent 4b11d86571
commit be78aa8a38
2 changed files with 46 additions and 0 deletions
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2
arch/riscv/kvm/vcpu_sbi.c
View File

@ -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,

44
arch/riscv/kvm/vcpu_sbi_replace.c
View File

@ -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,
};