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RISC-V: KVM: Treat SBI HFENCE calls as NOPs

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We should treat SBI HFENCE calls as NOPs until nested virtualization
is supported by KVM RISC-V. This will help us test booting a hypervisor
under KVM RISC-V.

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 2022-05-09 10:43:46 +05:30 • committed by Anup Patel
parent b4bbb95ea6
commit c7fa3c48de
1 changed files with 5 additions and 1 deletions
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6
arch/riscv/kvm/vcpu_sbi_replace.c
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@ -117,7 +117,11 @@ static int kvm_sbi_ext_rfence_handler(struct kvm_vcpu *vcpu, struct kvm_run *run
case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID: case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID:
case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA: case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA:
case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID: case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID:
/* TODO: implement for nested hypervisor case */ /*
* Until nested virtualization is implemented, the
* SBI HFENCE calls should be treated as NOPs
*/
break;
default: default:
ret = -EOPNOTSUPP; ret = -EOPNOTSUPP;
} }