linux-kernel - Re: [PATCH -tip] x86: fix iommu=soft boot option

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: <20091208092438Z.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 8 Dec 2009 09:24:47 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	yinghai@...nel.org
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip] x86: fix iommu=soft boot option

On Wed, 2 Dec 2009 17:07:24 +0900
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> On Tue, 01 Dec 2009 23:55:28 -0800
> Yinghai Lu <yinghai@...nel.org> wrote:
> 
> > >>>> amd 64 systems that
> > >>>> 1. do not have  AGP
> > >>>> 2. do not have IOMMU
> > >>>> 3. mem > 4g
> > >>>> 4. BIOS do not allocate  correct gart in NB.
> > >>>> will leave them to use SWIOTLB forcely.
> > >>> As I asked earlier, can you tell me what dma ops such system is
> > >>> supposed to use?
> > >> gart_dma_ops
> > > 
> > > How does gart_dma_ops work on systems without IOMMU?
> > 
> > ?
> 
> If a system doesn't have IOMMU, what does gart_dma_ops do?

Ping?

I don't understand the above but the patch is fine about fixing two
things:

- swiotlb wrongly steals the preallocate memory for broken gart.

- a system without agp should disable gart on shutdown.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/