linux-kernel - Re: [RFC PATCH v2 23/32] kvm: introduce KVM_MEMORY_ENCRYPT

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Date:   Thu, 16 Mar 2017 11:25:15 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Brijesh Singh <brijesh.singh@....com>, simon.guinot@...uanux.org,
        linux-efi@...r.kernel.org, kvm@...r.kernel.org, rkrcmar@...hat.com,
        matt@...eblueprint.co.uk, linux-pci@...r.kernel.org,
        linus.walleij@...aro.org, gary.hook@....com, linux-mm@...ck.org,
        paul.gortmaker@...driver.com, hpa@...or.com, cl@...ux.com,
        dan.j.williams@...el.com, aarcange@...hat.com,
        sfr@...b.auug.org.au, andriy.shevchenko@...ux.intel.com,
        herbert@...dor.apana.org.au, bhe@...hat.com, xemul@...allels.com,
        joro@...tes.org, x86@...nel.org, peterz@...radead.org,
        piotr.luc@...el.com, mingo@...hat.com, msalter@...hat.com,
        ross.zwisler@...ux.intel.com, bp@...e.de, dyoung@...hat.com,
        thomas.lendacky@....com, jroedel@...e.de, keescook@...omium.org,
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        luto@...nel.org, devel@...uxdriverproject.org, bhelgaas@...gle.com,
        tglx@...utronix.de, mchehab@...nel.org, iamjoonsoo.kim@....com,
        labbott@...oraproject.org, tony.luck@...el.com,
        alexandre.bounine@....com, kuleshovmail@...il.com,
        linux-kernel@...r.kernel.org, mcgrof@...nel.org, mst@...hat.com,
        linux-crypto@...r.kernel.org, tj@...nel.org,
        akpm@...ux-foundation.org, davem@...emloft.net
Subject: Re: [RFC PATCH v2 23/32] kvm: introduce KVM_MEMORY_ENCRYPT_OP ioctl



On 02/03/2017 16:17, Brijesh Singh wrote:
> If hardware supports encrypting then KVM_MEMORY_ENCRYPT_OP ioctl can
> be used by qemu to issue platform specific memory encryption commands.
> 
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> ---
>  arch/x86/include/asm/kvm_host.h |    2 ++
>  arch/x86/kvm/x86.c              |   12 ++++++++++++
>  include/uapi/linux/kvm.h        |    2 ++
>  3 files changed, 16 insertions(+)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index bff1f15..62651ad 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1033,6 +1033,8 @@ struct kvm_x86_ops {
>  	void (*cancel_hv_timer)(struct kvm_vcpu *vcpu);
>  
>  	void (*setup_mce)(struct kvm_vcpu *vcpu);
> +
> +	int (*memory_encryption_op)(struct kvm *kvm, void __user *argp);
>  };
>  
>  struct kvm_arch_async_pf {
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 2099df8..6a737e9 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -3926,6 +3926,14 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
>  	return r;
>  }
>  
> +static int kvm_vm_ioctl_memory_encryption_op(struct kvm *kvm, void __user *argp)
> +{
> +	if (kvm_x86_ops->memory_encryption_op)
> +		return kvm_x86_ops->memory_encryption_op(kvm, argp);
> +
> +	return -ENOTTY;
> +}
> +
>  long kvm_arch_vm_ioctl(struct file *filp,
>  		       unsigned int ioctl, unsigned long arg)
>  {
> @@ -4189,6 +4197,10 @@ long kvm_arch_vm_ioctl(struct file *filp,
>  		r = kvm_vm_ioctl_enable_cap(kvm, &cap);
>  		break;
>  	}
> +	case KVM_MEMORY_ENCRYPT_OP: {
> +		r = kvm_vm_ioctl_memory_encryption_op(kvm, argp);
> +		break;
> +	}
>  	default:
>  		r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
>  	}
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index cac48ed..fef7d83 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1281,6 +1281,8 @@ struct kvm_s390_ucas_mapping {
>  #define KVM_S390_GET_IRQ_STATE	  _IOW(KVMIO, 0xb6, struct kvm_s390_irq_state)
>  /* Available with KVM_CAP_X86_SMM */
>  #define KVM_SMI                   _IO(KVMIO,   0xb7)
> +/* Memory Encryption Commands */
> +#define KVM_MEMORY_ENCRYPT_OP	  _IOWR(KVMIO, 0xb8, unsigned long)
>  
>  #define KVM_DEV_ASSIGN_ENABLE_IOMMU	(1 << 0)
>  #define KVM_DEV_ASSIGN_PCI_2_3		(1 << 1)
> 

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>