From c7fa3c48de86053b0f1949fa5532082544e30fce Mon Sep 17 00:00:00 2001 From: Anup Patel Date: Mon, 9 May 2022 10:43:46 +0530 Subject: [PATCH] RISC-V: KVM: Treat SBI HFENCE calls as NOPs 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 Reviewed-by: Atish Patra Signed-off-by: Anup Patel --- arch/riscv/kvm/vcpu_sbi_replace.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_replace.c index 0f217365c2875..3c1dcd38358e3 100644 --- a/arch/riscv/kvm/vcpu_sbi_replace.c +++ b/arch/riscv/kvm/vcpu_sbi_replace.c @@ -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_VVMA: 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: ret = -EOPNOTSUPP; } -- 2.30.2