Commit be78aa8a authored by Anup Patel's avatar Anup Patel Committed by Anup Patel
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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: default avatarAnup Patel <apatel@ventanamicro.com>
Reviewed-by: default avatarAtish Patra <atishp@rivosinc.com>
Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent 4b11d865

arch/riscv/kvm/vcpu_sbi.c

+2 −0
Original line number Diff line number Diff line
@@ -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,

arch/riscv/kvm/vcpu_sbi_replace.c

+44 −0
Original line number Diff line number Diff line
@@ -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,

};