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SubjectRe: [PATCH v6 10/21] RISC-V: KVM: Handle MMIO exits for VCPU
On Thu, Aug 29, 2019 at 01:56:18PM +0000, Anup Patel wrote:
> int kvm_riscv_vcpu_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
> {
> - /* TODO: */
> + u8 data8;
> + u16 data16;
> + u32 data32;
> + u64 data64;
> + ulong insn;
> + int len, shift;
> +
> + insn = vcpu->arch.mmio_decode.insn;
> +
> + if (run->mmio.is_write)
> + goto done;
> +
> + len = vcpu->arch.mmio_decode.len;
> + shift = vcpu->arch.mmio_decode.shift;
> +
> + switch (len) {
> + case 1:
> + data8 = *((u8 *)run->mmio.data);
> + SET_RD(insn, &vcpu->arch.guest_context,
> + (ulong)data8 << shift >> shift);
> + break;
> + case 2:
> + data16 = *((u16 *)run->mmio.data);
> + SET_RD(insn, &vcpu->arch.guest_context,
> + (ulong)data16 << shift >> shift);
> + break;
> + case 4:
> + data32 = *((u32 *)run->mmio.data);
> + SET_RD(insn, &vcpu->arch.guest_context,
> + (ulong)data32 << shift >> shift);
> + break;
> + case 8:
> + data64 = *((u64 *)run->mmio.data);
> + SET_RD(insn, &vcpu->arch.guest_context,
> + (ulong)data64 << shift >> shift);
> + break;
> + default:
> + return -ENOTSUPP;
> + };
> +
> +done:
> + /* Move to next instruction */
> + vcpu->arch.guest_context.sepc += INSN_LEN(insn);
> +

As I pointed out in the last review, just moving this instruction skip
here is not enough. Doing so introduces the same problem that 2113c5f62b74
("KVM: arm/arm64: Only skip MMIO insn once") fixes for arm.

Thanks,
drew

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