diff options
| author | Andy Chiu <andy.chiu@sifive.com> | 2023-01-27 08:58:55 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2023-02-07 18:05:28 +0300 |
| commit | cdeb59bbf19f456253fd257c744b8383f972cf1e (patch) | |
| tree | 6c32c0eecab36bcf6bf2da7f01174928e46363ba /arch/riscv/kvm | |
| parent | 06723e124fcbf63a1848c692fad17a023cad5ebc (diff) | |
| download | linux-cdeb59bbf19f456253fd257c744b8383f972cf1e.tar.xz | |
RISC-V: KVM: Redirect illegal instruction traps to guest
The M-mode redirects an unhandled illegal instruction trap back
to S-mode. However, KVM running in HS-mode terminates the VS-mode
software when it receives illegal instruction trap. Instead, KVM
should redirect the illegal instruction trap back to VS-mode, and
let VS-mode trap handler decide the next step. This futher allows
guest kernel to implement on-demand enabling of vector extension
for a guest user space process upon first-use.
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'arch/riscv/kvm')
| -rw-r--r-- | arch/riscv/kvm/vcpu_exit.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c index af7c4bc07929..4ea101a73d8b 100644 --- a/arch/riscv/kvm/vcpu_exit.c +++ b/arch/riscv/kvm/vcpu_exit.c @@ -182,6 +182,12 @@ int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, ret = -EFAULT; run->exit_reason = KVM_EXIT_UNKNOWN; switch (trap->scause) { + case EXC_INST_ILLEGAL: + if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV) { + kvm_riscv_vcpu_trap_redirect(vcpu, trap); + ret = 1; + } + break; case EXC_VIRTUAL_INST_FAULT: if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV) ret = kvm_riscv_vcpu_virtual_insn(vcpu, run, trap); |