From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Shuo A Liu <shuo.a.liu@intel.com>
Cc: linux-kernel@vger.kernel.org, x86@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>,
Zhi Wang <zhi.a.wang@intel.com>,
Zhenyu Wang <zhenyuw@linux.intel.com>
Subject: Re: [PATCH v5 06/17] virt: acrn: Introduce VM management interfaces
Date: Thu, 5 Nov 2020 07:29:07 +0100 [thread overview]
Message-ID: <20201105062907.GA693781@kroah.com> (raw)
In-Reply-To: <20201105031029.GB17702@shuo-intel.sh.intel.com>
On Thu, Nov 05, 2020 at 11:10:29AM +0800, Shuo A Liu wrote:
> On Wed 4.Nov'20 at 20:02:35 +0100, Greg Kroah-Hartman wrote:
> > On Mon, Oct 19, 2020 at 02:17:52PM +0800, shuo.a.liu@intel.com wrote:
> > > --- /dev/null
> > > +++ b/include/uapi/linux/acrn.h
> > > @@ -0,0 +1,56 @@
> > > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > > +/*
> > > + * Userspace interface for /dev/acrn_hsm - ACRN Hypervisor Service Module
> > > + *
> > > + * This file can be used by applications that need to communicate with the HSM
> > > + * via the ioctl interface.
> > > + */
> > > +
> > > +#ifndef _UAPI_ACRN_H
> > > +#define _UAPI_ACRN_H
> > > +
> > > +#include <linux/types.h>
> > > +
> > > +/**
> > > + * struct acrn_vm_creation - Info to create a User VM
> > > + * @vmid: User VM ID returned from the hypervisor
> > > + * @reserved0: Reserved
> > > + * @vcpu_num: Number of vCPU in the VM. Return from hypervisor.
> > > + * @reserved1: Reserved
> > > + * @uuid: UUID of the VM. Pass to hypervisor directly.
> > > + * @vm_flag: Flag of the VM creating. Pass to hypervisor directly.
> > > + * @ioreq_buf: Service VM GPA of I/O request buffer. Pass to
> > > + * hypervisor directly.
> > > + * @cpu_affinity: CPU affinity of the VM. Pass to hypervisor directly.
> > > + * @reserved2: Reserved
> >
> > Reserved and must be 0?
>
> Not a must.
That's guaranteed to come back and bite you in the end. You all have
read the "how to write a good api" document, right?
> > What are they reserved for?
> >
> > Same for all of the reserved fields, why?
>
> Some reserved fields are to map layout in the hypervisor side, others
> are for future use.
ioctls should not have these, again, please read the documentation. If
you need something new in the future, just make a new ioctl.
> > > + */
> > > +struct acrn_vm_creation {
> > > + __u16 vmid;
> > > + __u16 reserved0;
> > > + __u16 vcpu_num;
> > > + __u16 reserved1;
> > > + __u8 uuid[16];
> >
> > We have a userspace-visable uid structure in include/uapi/uuid.h, why
> > not use that?
>
> we just pass the uuid data from user space to hypervisor. So, we can
> remove a header dependeny with using raw data format.
I do not understand this, please use the built-in kernel types we have.
thanks,
greg k-h
next prev parent reply other threads:[~2020-11-05 6:29 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-19 6:17 [PATCH v5 00/17] HSM driver for ACRN hypervisor shuo.a.liu
2020-10-19 6:17 ` [PATCH v5 01/17] docs: acrn: Introduce ACRN shuo.a.liu
2020-10-19 6:17 ` [PATCH v5 02/17] x86/acrn: Introduce acrn_{setup, remove}_intr_handler() shuo.a.liu
2020-10-19 6:17 ` [PATCH v5 03/17] x86/acrn: Introduce an API to check if a VM is privileged shuo.a.liu
2020-11-02 14:37 ` Borislav Petkov
2020-11-03 6:27 ` Shuo A Liu
2020-11-03 10:25 ` Borislav Petkov
2020-11-04 3:50 ` Shuo A Liu
2020-11-04 18:51 ` Borislav Petkov
2020-11-05 3:25 ` Shuo A Liu
2020-10-19 6:17 ` [PATCH v5 04/17] x86/acrn: Introduce hypercall interfaces shuo.a.liu
2020-10-19 21:53 ` Nick Desaulniers
2020-10-19 22:15 ` Arvind Sankar
2020-10-20 1:38 ` Shuo A Liu
2020-10-20 2:08 ` Arvind Sankar
2020-10-20 2:30 ` Shuo A Liu
2020-10-20 14:16 ` Arvind Sankar
2020-10-21 1:16 ` Shuo A Liu
2020-11-02 14:56 ` Borislav Petkov
2020-11-02 16:09 ` Segher Boessenkool
2020-11-02 17:19 ` Borislav Petkov
2020-11-02 18:10 ` Segher Boessenkool
2020-11-02 18:34 ` Borislav Petkov
2020-11-02 20:01 ` Segher Boessenkool
2020-11-02 22:54 ` Borislav Petkov
2020-11-02 23:18 ` Segher Boessenkool
2020-11-03 16:44 ` Borislav Petkov
2020-11-03 18:47 ` Segher Boessenkool
2020-11-03 19:43 ` Borislav Petkov
2020-10-19 6:17 ` [PATCH v5 05/17] virt: acrn: Introduce ACRN HSM basic driver shuo.a.liu
2020-10-19 6:17 ` [PATCH v5 06/17] virt: acrn: Introduce VM management interfaces shuo.a.liu
2020-11-04 19:02 ` Greg Kroah-Hartman
2020-11-05 3:10 ` Shuo A Liu
2020-11-05 6:29 ` Greg Kroah-Hartman [this message]
2020-11-05 7:35 ` Shuo A Liu
2020-11-05 8:26 ` Greg Kroah-Hartman
2020-11-05 9:02 ` Shuo A Liu
2020-11-05 9:16 ` Greg Kroah-Hartman
2020-11-05 12:48 ` Shuo A Liu
2020-11-05 13:04 ` Greg Kroah-Hartman
2020-10-19 6:17 ` [PATCH v5 07/17] virt: acrn: Introduce an ioctl to set vCPU registers state shuo.a.liu
2020-11-09 17:09 ` Greg Kroah-Hartman
2020-11-10 13:14 ` Shuo A Liu
2020-11-10 14:54 ` Greg Kroah-Hartman
2020-11-11 9:54 ` Shuo A Liu
2020-11-11 10:28 ` Greg Kroah-Hartman
2020-11-11 12:03 ` Shuo A Liu
2020-11-11 12:29 ` Greg Kroah-Hartman
2020-11-11 16:55 ` Shuo A Liu
2020-10-19 6:17 ` [PATCH v5 08/17] virt: acrn: Introduce EPT mapping management shuo.a.liu
2020-10-19 6:17 ` [PATCH v5 09/17] virt: acrn: Introduce I/O request management shuo.a.liu
2020-10-19 6:17 ` [PATCH v5 10/17] virt: acrn: Introduce PCI configuration space PIO accesses combiner shuo.a.liu
2020-10-19 6:17 ` [PATCH v5 11/17] virt: acrn: Introduce interfaces for PCI device passthrough shuo.a.liu
2020-10-19 6:17 ` [PATCH v5 12/17] virt: acrn: Introduce interrupt injection interfaces shuo.a.liu
2020-10-19 6:17 ` [PATCH v5 13/17] virt: acrn: Introduce interfaces to query C-states and P-states allowed by hypervisor shuo.a.liu
2020-10-19 6:18 ` [PATCH v5 14/17] virt: acrn: Introduce I/O ranges operation interfaces shuo.a.liu
2020-10-19 6:18 ` [PATCH v5 15/17] virt: acrn: Introduce ioeventfd shuo.a.liu
2020-10-19 6:18 ` [PATCH v5 16/17] virt: acrn: Introduce irqfd shuo.a.liu
2020-10-19 6:18 ` [PATCH v5 17/17] virt: acrn: Introduce an interface for Service VM to control vCPU shuo.a.liu
2020-10-21 15:19 ` [PATCH v5 00/17] HSM driver for ACRN hypervisor Dave Hansen
2020-10-26 0:39 ` Shuo A Liu
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