diff options
Diffstat (limited to 'arch/riscv/kvm/vcpu_sbi_base.c')
-rw-r--r-- | arch/riscv/kvm/vcpu_sbi_base.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu_sbi_base.c b/arch/riscv/kvm/vcpu_sbi_base.c new file mode 100644 index 000000000000..5bc570b984f4 --- /dev/null +++ b/arch/riscv/kvm/vcpu_sbi_base.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2021 Western Digital Corporation or its affiliates. + * + * Authors: + * Atish Patra <atish.patra@wdc.com> + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/kvm_host.h> +#include <linux/version.h> +#include <asm/sbi.h> +#include <asm/kvm_vcpu_sbi.h> + +static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, + struct kvm_vcpu_sbi_return *retdata) +{ + struct kvm_cpu_context *cp = &vcpu->arch.guest_context; + const struct kvm_vcpu_sbi_extension *sbi_ext; + unsigned long *out_val = &retdata->out_val; + + switch (cp->a6) { + case SBI_EXT_BASE_GET_SPEC_VERSION: + *out_val = (KVM_SBI_VERSION_MAJOR << + SBI_SPEC_VERSION_MAJOR_SHIFT) | + KVM_SBI_VERSION_MINOR; + break; + case SBI_EXT_BASE_GET_IMP_ID: + *out_val = KVM_SBI_IMPID; + break; + case SBI_EXT_BASE_GET_IMP_VERSION: + *out_val = LINUX_VERSION_CODE; + break; + case SBI_EXT_BASE_PROBE_EXT: + if ((cp->a0 >= SBI_EXT_EXPERIMENTAL_START && + cp->a0 <= SBI_EXT_EXPERIMENTAL_END) || + (cp->a0 >= SBI_EXT_VENDOR_START && + cp->a0 <= SBI_EXT_VENDOR_END)) { + /* + * For experimental/vendor extensions + * forward it to the userspace + */ + kvm_riscv_vcpu_sbi_forward(vcpu, run); + retdata->uexit = true; + } else { + sbi_ext = kvm_vcpu_sbi_find_ext(vcpu, cp->a0); + *out_val = sbi_ext && sbi_ext->probe ? + sbi_ext->probe(vcpu) : !!sbi_ext; + } + break; + case SBI_EXT_BASE_GET_MVENDORID: + *out_val = vcpu->arch.mvendorid; + break; + case SBI_EXT_BASE_GET_MARCHID: + *out_val = vcpu->arch.marchid; + break; + case SBI_EXT_BASE_GET_MIMPID: + *out_val = vcpu->arch.mimpid; + break; + default: + retdata->err_val = SBI_ERR_NOT_SUPPORTED; + break; + } + + return 0; +} + +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base = { + .extid_start = SBI_EXT_BASE, + .extid_end = SBI_EXT_BASE, + .handler = kvm_sbi_ext_base_handler, +}; + +static int kvm_sbi_ext_forward_handler(struct kvm_vcpu *vcpu, + struct kvm_run *run, + struct kvm_vcpu_sbi_return *retdata) +{ + /* + * Both SBI experimental and vendor extensions are + * unconditionally forwarded to userspace. + */ + kvm_riscv_vcpu_sbi_forward(vcpu, run); + retdata->uexit = true; + return 0; +} + +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental = { + .extid_start = SBI_EXT_EXPERIMENTAL_START, + .extid_end = SBI_EXT_EXPERIMENTAL_END, + .handler = kvm_sbi_ext_forward_handler, +}; + +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor = { + .extid_start = SBI_EXT_VENDOR_START, + .extid_end = SBI_EXT_VENDOR_END, + .handler = kvm_sbi_ext_forward_handler, +}; |