Re: [PATCH RESEND v4 7/9] KVM: VMX: Handle SPP induced vmexit and page fault

[Paolo Bonzini]

On 14/08/19 09:04, Yang Weijiang wrote:
> +			/*
> +			 * Record write protect fault caused by
> +			 * Sub-page Protection, let VMI decide
> +			 * the next step.
> +			 */
> +			if (spte & PT_SPP_MASK) {

Should this be "if (spte & PT_WRITABLE_MASK)" instead?  That is, if the
page is already writable, the fault must be an SPP fault.

Paolo

> +				fault_handled = true;
> +				vcpu->run->exit_reason = KVM_EXIT_SPP;
> +				vcpu->run->spp.addr = gva;
> +				kvm_skip_emulated_instruction(vcpu);
> +				break;
> +			}
> +
>  			new_spte |= PT_WRITABLE_MASK;