linux-kernel - Re: [PATCH v4 10/23] iommufd/viommu: Introduce IOMMUFD_OBJ_HW

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aCYhksN8Zlp1QMP8@Asurada-Nvidia>
Date: Thu, 15 May 2025 10:17:06 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <kevin.tian@...el.com>, <corbet@....net>, <will@...nel.org>,
	<bagasdotme@...il.com>, <robin.murphy@....com>, <joro@...tes.org>,
	<thierry.reding@...il.com>, <vdumpa@...dia.com>, <jonathanh@...dia.com>,
	<shuah@...nel.org>, <jsnitsel@...hat.com>, <nathan@...nel.org>,
	<peterz@...radead.org>, <yi.l.liu@...el.com>, <mshavit@...gle.com>,
	<praan@...gle.com>, <zhangzekun11@...wei.com>, <iommu@...ts.linux.dev>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-tegra@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>, <patches@...ts.linux.dev>,
	<mochs@...dia.com>, <alok.a.tiwari@...cle.com>, <vasant.hegde@....com>
Subject: Re: [PATCH v4 10/23] iommufd/viommu: Introduce IOMMUFD_OBJ_HW_QUEUE
 and its related struct

On Thu, May 15, 2025 at 12:39:03PM -0300, Jason Gunthorpe wrote:
> On Thu, May 08, 2025 at 08:02:31PM -0700, Nicolin Chen wrote:
> > +#define iommufd_hw_queue_alloc(viommu, drv_struct, member)                     \
> > +	({                                                                     \
> > +		drv_struct *ret;                                               \
> > +									       \
> > +		static_assert(__same_type(struct iommufd_viommu, *viommu));    \
> > +		static_assert(__same_type(struct iommufd_hw_queue,             \
> > +					  ((drv_struct *)NULL)->member));      \
> > +		static_assert(offsetof(drv_struct, member.obj) == 0);          \
> > +		ret = (drv_struct *)_iommufd_object_alloc(                     \
> > +			viommu->ictx, sizeof(drv_struct),                      \
> > +			IOMMUFD_OBJ_HW_QUEUE);                                 \
> > +		if (!IS_ERR(ret)) {                                            \
> > +			ret->member.viommu = viommu;                           \
> > +			ret->member.ictx = viommu->ictx;                       \
> > +		}                                                              \
> > +		ret;                                                           \
> > +	})
> 
> This should just call 
> 
> __iommufd_object_alloc(viommu->ictx, ret, IOMMUFD_OBJ_HW_QUEUE member.obj)
> 
> And all the casting and asserts should be in that macro, move it to
> this header

Ack.

> >  /* Helper for IOMMU driver to destroy structures created by allocators above */
> >  #define iommufd_struct_destroy(drv_struct, member)                             \
> >  	({                                                                     \
> 
> This is abort not destroy, the names should be consistent. But looking
> more at the series I think it will be better to do the little rework I
> suggested and not give this function to the driver in the first place.

Yea, it will be replaced in v5.

Thanks
Nicolin