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From: Shuo A Liu <shuo.a.liu@intel.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	<linux-kernel@vger.kernel.org>, "H . Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Yu Wang <yu1.wang@intel.com>,
	"Reinette Chatre" <reinette.chatre@intel.com>, <x86@kernel.org>,
	Zhi Wang <zhi.a.wang@intel.com>,
	Zhenyu Wang <zhenyuw@linux.intel.com>
Subject: Re: [PATCH 05/17] virt: acrn: Introduce ACRN HSM basic driver
Date: Sun, 30 Aug 2020 16:16:15 +0800	[thread overview]
Message-ID: <20200830081615.GG13723@shuo-intel.sh.intel.com> (raw)
In-Reply-To: <58093008-3072-f9df-5245-f74a82906e47@intel.com>

Hi Dave,

On Sat 29.Aug'20 at  9:12:22 -0700, Dave Hansen wrote:
>On 8/29/20 3:46 AM, Shuo A Liu wrote:
>> On Fri 28.Aug'20 at 12:25:59 +0200, Greg Kroah-Hartman wrote:
>>> On Tue, Aug 25, 2020 at 10:45:05AM +0800, shuo.a.liu@intel.com wrote:
>>>> +static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
>>>> +               unsigned long ioctl_param)
>>>> +{
>>>> +    if (cmd == ACRN_IOCTL_GET_API_VERSION) {
>>>> +        if (copy_to_user((void __user *)ioctl_param,
>>>> +                 &api_version, sizeof(api_version)))
>>>> +            return -EFAULT;
>>>
>>> Why are you versioning your api?  Shouldn't that not be a thing and you
>>> either support an ioctl or you do not?
>>
>> The API version here is more for the hypercalls.
>> The hypercalls might evolve later
>
>They might evolve, but the old ones must always keep working.  Right?

Yes, it's right.

>
>> and the version indicates which set of interfaces (include the
>> paramters' format) should be used by user space tools. Currently,
>> it's used rarely.
>Why do you need this when the core kernel doesn't?  We add syscalls,
>ioctl()s and prctl()s all the time, but nothing is versioned.

Indeed. It looks a bit odd.

>
>This sounds like something you need to remove from the series.

OK. I will remove the api version related code.

Thanks
shuo

  reply	other threads:[~2020-08-30  8:16 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-25  2:45 [PATCH 00/17] HSM driver for ACRN hypervisor shuo.a.liu
2020-08-25  2:45 ` [PATCH 01/17] docs: acrn: Introduce ACRN shuo.a.liu
2020-08-25  2:45 ` [PATCH 02/17] x86/acrn: Introduce acrn_{setup, remove}_intr_handler() shuo.a.liu
2020-08-25  2:45 ` [PATCH 03/17] x86/acrn: Introduce an API to check if a VM is privileged shuo.a.liu
2020-08-25  2:45 ` [PATCH 04/17] x86/acrn: Introduce hypercall interfaces shuo.a.liu
2020-08-25  2:45 ` [PATCH 05/17] virt: acrn: Introduce ACRN HSM basic driver shuo.a.liu
2020-08-28 10:25   ` Greg Kroah-Hartman
2020-08-29 10:46     ` Shuo A Liu
2020-08-29 16:12       ` Dave Hansen
2020-08-30  8:16         ` Shuo A Liu [this message]
2020-08-25  2:45 ` [PATCH 06/17] virt: acrn: Introduce VM management interfaces shuo.a.liu
2020-08-28 10:27   ` Greg Kroah-Hartman
2020-08-29 10:55     ` Shuo A Liu
2020-08-28 10:27   ` Greg Kroah-Hartman
2020-08-29 11:04     ` Shuo A Liu
2020-08-30  7:23       ` Greg Kroah-Hartman
2020-08-31  6:25         ` Shuo A Liu
2020-08-25  2:45 ` [PATCH 07/17] virt: acrn: Introduce an ioctl to set vCPU registers state shuo.a.liu
2020-08-25  2:45 ` [PATCH 08/17] virt: acrn: Introduce EPT mapping management shuo.a.liu
2020-08-25  2:45 ` [PATCH 09/17] virt: acrn: Introduce I/O request management shuo.a.liu
2020-08-25  2:45 ` [PATCH 10/17] virt: acrn: Introduce PCI configuration space PIO accesses combiner shuo.a.liu
2020-08-25  2:45 ` [PATCH 11/17] virt: acrn: Introduce interfaces for PCI device passthrough shuo.a.liu
2020-08-25  2:45 ` [PATCH 12/17] virt: acrn: Introduce interrupt injection interfaces shuo.a.liu
2020-08-25  2:45 ` [PATCH 13/17] virt: acrn: Introduce interfaces to query C-states and P-states allowed by hypervisor shuo.a.liu
2020-08-25  2:45 ` [PATCH 14/17] virt: acrn: Introduce I/O ranges operation interfaces shuo.a.liu
2020-08-25  2:45 ` [PATCH 15/17] virt: acrn: Introduce ioeventfd shuo.a.liu
2020-08-25  2:45 ` [PATCH 16/17] virt: acrn: Introduce irqfd shuo.a.liu
2020-08-25  2:45 ` [PATCH 17/17] virt: acrn: Introduce an interface for Service VM to control vCPU shuo.a.liu

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