linux-kernel - Re: [PATCH v8 1/5] x86/tdx: Add TDX Guest attestation interface driver

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Date:   Tue, 5 Jul 2022 14:21:55 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Kai Huang <kai.huang@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org
Cc:     "H . Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Wander Lairson Costa <wander@...hat.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        marcelo.cerri@...onical.com, tim.gardner@...onical.com,
        khalid.elmously@...onical.com, philip.cox@...onical.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 1/5] x86/tdx: Add TDX Guest attestation interface
 driver



On 7/5/22 11:52 AM, Dave Hansen wrote:
> On 7/5/22 11:45, Sathyanarayanan Kuppuswamy wrote:
>> Yes, there are many ways to design this. But I still think IOCTL is a better fit
>> for the request/response kind of use case.
> 
> Are there any other similar ABIs in the kernel?  What kind of mechanism
> do they use?

AMD also plans to add attestation support. It also uses IOCTL approach.

https://patchwork.kernel.org/project/linux-mm/patch/20220307213356.2797205-44-brijesh.singh@amd.com/

SGX is a related feature. It also uses IOCTL approach for enclave provisioning.

arch/x86/kernel/cpu/sgx/ioctl.c

Other examples (not very related) are,

drivers/platform/chrome/cros_ec_chardev.c - It is an embedded controller driver which
has IOCTL support to read memory region from the device.
drivers/s390/crypto/pkey_api.c - It has IOCTL interfaces to read/write/generate crypto
keys.
drivers/crypto/ccp/sev-dev.c - sev_ioctl() has some IOCTL to set/get keys.
drivers/platform/x86/intel_scu_ipcutil.c - Uses IOCTL to read contents of registers.




-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer