linux-kernel - Re: [PATCH v2 1/2] KVM: X86: Introduce KVM_HC_PAGE_ENC

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Date:   Tue, 27 Apr 2021 22:04:47 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        srutherford@...gle.com, joro@...tes.org, brijesh.singh@....com,
        thomas.lendacky@....com, venu.busireddy@...cle.com,
        Ashish Kalra <ashish.kalra@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        x86@...nel.org
Subject: Re: [PATCH v2 1/2] KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS
 hypercall

On Wed, Apr 21, 2021, Paolo Bonzini wrote:
> @@ -8334,6 +8350,26 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
>  		kvm_sched_yield(vcpu, a0);
>  		ret = 0;
>  		break;
> +	case KVM_HC_PAGE_ENC_STATUS: {
> +		u64 gpa = a0, npages = a1, enc = a2;

newline

> +		if (!guest_pv_has(vcpu, KVM_FEATURE_HC_PAGE_ENC_STATUS)
> +		    || !(vcpu->kvm->arch.hypercall_exit_enabled & (1 << KVM_HC_PAGE_ENC_STATUS)))

|| on previous line, pretty please :-)

> +			break;
> +
> +		ret = -KVM_EINVAL;
> +		if (!PAGE_ALIGNED(gpa) || !npages ||
> +		    gpa_to_gfn(gpa) + npages <= gpa_to_gfn(gpa))
> +			break;
> +
> +		vcpu->run->exit_reason        = KVM_EXIT_HYPERCALL;
> +		vcpu->run->hypercall.nr       = KVM_HC_PAGE_ENC_STATUS;
> +		vcpu->run->hypercall.args[0]  = gpa;
> +		vcpu->run->hypercall.args[1]  = npages;
> +		vcpu->run->hypercall.args[2]  = enc;
> +		vcpu->run->hypercall.longmode = op_64_bit;
> +		vcpu->arch.complete_userspace_io = complete_hypercall_exit;
> +		return 0;
> +	}
>  	default:
>  		ret = -KVM_ENOSYS;
>  		break;