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Subject: Re: [virtio-dev] Re: [Qemu-devel] [PATCH v15 0/2] virtio-crypto: virtio crypto device specification
On Fri, Jan 13, 2017 at 02:54:29AM +0000, Gonglei (Arei) wrote: > > > > > On Thu, Jan 12, 2017 at 12:26:24PM +0000, Gonglei (Arei) wrote: > > > Hi, > > > > > > > > > > > > > > On 01/04/2017 11:10 AM, Gonglei (Arei) wrote: > > > > > Hi all, > > > > > > > > > > I attach the diff files between v14 and v15 for better review. > > > > > > > > > Hi, > > > > > > > > only had a quick look. Will try to come back to this later. > > > > > > > That's cool. > > > > > > > > diff --git a/virtio-crypto.tex b/virtio-crypto.tex > > > > > index 9f7faf0..884ee95 100644 > > > > > --- a/virtio-crypto.tex > > > > > +++ b/virtio-crypto.tex > > > > > @@ -2,8 +2,8 @@ > > > > > > > > > > The virtio crypto device is a virtual cryptography device as well as a kind > > of > > > > > virtual hardware accelerator for virtual machines. The encryption and > > > > > -decryption requests are placed in the data queue and are ultimately > > handled > > > > by the > > > > > -backend crypto accelerators. The second queue is the control queue used > > to > > > > create > > > > > +decryption requests are placed in any of the data active queues and are > > > > ultimately handled by the > > > > s/data active/active data/ > > > > > +backend crypto accelerators. The second kind of queue is the control > > queue > > > > used to create > > > > > or destroy sessions for symmetric algorithms and will control some > > > > advanced > > > > > features in the future. The virtio crypto device provides the following > > crypto > > > > > services: CIPHER, MAC, HASH, and AEAD. > > > > > > > > [..] > > > > > > > > > ===============The below diff shows the changes of add non-session > > mode > > > > support: > > > > > > > > > > diff --git a/virtio-crypto.tex b/virtio-crypto.tex > > > > > index 884ee95..44819f9 100644 > > > > > --- a/virtio-crypto.tex > > > > > +++ b/virtio-crypto.tex > > > > > @@ -26,7 +26,10 @@ N is set by \field{max_dataqueues}. > > > > > > > > > > \subsection{Feature bits}\label{sec:Device Types / Crypto Device / > > Feature > > > > bits} > > > > > > > > > > -None currently defined. > > > > > +VIRTIO_CRYPTO_F_CIPHER_SESSION_MODE (1) Session mode is > > available > > > > for CIPHER service. > > > > > +VIRTIO_CRYPTO_F_HASH_SESSION_MODE (2) Session mode is available > > for > > > > HASH service. > > > > > +VIRTIO_CRYPTO_F_MAC_SESSION_MODE (3) Session mode is available > > for > > > > MAC service. > > > > > +VIRTIO_CRYPTO_F_AEAD_SESSION_MODE (4) Session mode is available > > for > > > > AEAD service. > > > > > > > > > > \subsection{Device configuration layout}\label{sec:Device Types / > > Crypto > > > > Device / Device configuration layout} > > > > > > > > > > @@ -208,6 +211,9 @@ Operation parameters are algorithm-specific > > > > parameters, output data is the > > > > > data that should be utilized in operations, and input data is equal to > > > > > "operation result + result data". > > > > > > > > > > +The device can support both session mode (See \ref{sec:Device Types / > > > > Crypto Device / Device Operation / Control Virtqueue / Session operation}) > > and > > > > non-session mode, for example, > > > > > +As VIRTIO_CRYPTO_F_CIPHER_SESSION feature bit is negotiated, the > > driver > > > > can use session mode for CIPHER service, otherwise it can only use > > non-session > > > > mode. > > > > > + > > > > > > > > As far as I understand you are adding non-session mode to the mix but > > > > providing feature bits for session mode. Would this render the the current > > > > implementation non-compliant? > > > > > > > You are right, shall we use feature bits for non-session mode for compliancy? > > > Or because the spec is on the fly, and some structures in the virtio_crypto.h > > need to > > > be modified, can we keep the compliancy completely? > > > > > > Thanks, > > > -Gonglei > > > > Since there's a linux driver upstream you must at least > > keep compatibility with that. > > > Sure. We use feature bits for non-session mode then. > For structures modification, do we need to do some specific > actions for compatibility? Take CIPHER service as an example: > > The present structure: > > struct virtio_crypto_cipher_para { > /* > * Byte Length of valid IV/Counter data pointed to by the below iv data. > * > * For block ciphers in CBC or F8 mode, or for Kasumi in F8 mode, or for > * SNOW3G in UEA2 mode, this is the length of the IV (which > * must be the same as the block length of the cipher). > * For block ciphers in CTR mode, this is the length of the counter > * (which must be the same as the block length of the cipher). > */ > le32 iv_len; > /* length of source data */ > le32 src_data_len; > /* length of destination data */ > le32 dst_data_len; > }; > > The future structure if supporting non-session based operations: > > struct virtio_crypto_cipher_para { > struct { > /* See VIRTIO_CRYPTO_CIPHER* above */ > le32 algo; > /* length of key */ > le32 keylen; > > /* See VIRTIO_CRYPTO_OP_* above */ > le32 op; > } sess_para; > > /* > * Byte Length of valid IV/Counter data pointed to by the below iv data. > * > * For block ciphers in CBC or F8 mode, or for Kasumi in F8 mode, or for > * SNOW3G in UEA2 mode, this is the length of the IV (which > * must be the same as the block length of the cipher). > * For block ciphers in CTR mode, this is the length of the counter > * (which must be the same as the block length of the cipher). > */ > le32 iv_len; > /* length of source data */ > le32 src_data_len; > /* length of destination data */ > le32 dst_data_len; > }; > > Thanks, > -Gonglei So you will have to maintain both structures for when non-session based feature is and aren't present. You will have to give them different names, too. -- MST
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