diff options
| author | Anup Patel <apatel@ventanamicro.com> | 2025-06-05 09:14:47 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2025-06-17 07:48:40 +0300 |
| commit | 2e7be162996640bbe3b6da694cc064c511b8a5d9 (patch) | |
| tree | 557964eb02660bca62c763f1be41ec92a0ee0690 | |
| parent | 6aba0cb5bba6141158d5449f2cf53187b7f755f9 (diff) | |
| download | linux-2e7be162996640bbe3b6da694cc064c511b8a5d9.tar.xz | |
RISC-V: KVM: Don't treat SBI HFENCE calls as NOPs
The SBI specification clearly states that SBI HFENCE calls should
return SBI_ERR_NOT_SUPPORTED when one of the target hart doesn’t
support hypervisor extension (aka nested virtualization in-case
of KVM RISC-V).
Fixes: c7fa3c48de86 ("RISC-V: KVM: Treat SBI HFENCE calls as NOPs")
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Link: https://lore.kernel.org/r/20250605061458.196003-3-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
| -rw-r--r-- | arch/riscv/kvm/vcpu_sbi_replace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_replace.c index 9752d2ffff68..b17fad091bab 100644 --- a/arch/riscv/kvm/vcpu_sbi_replace.c +++ b/arch/riscv/kvm/vcpu_sbi_replace.c @@ -127,9 +127,9 @@ static int kvm_sbi_ext_rfence_handler(struct kvm_vcpu *vcpu, struct kvm_run *run case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID: /* * Until nested virtualization is implemented, the - * SBI HFENCE calls should be treated as NOPs + * SBI HFENCE calls should return not supported + * hence fallthrough. */ - break; default: retdata->err_val = SBI_ERR_NOT_SUPPORTED; } |