From: Joerg Roedel <jroedel-l3A5Bk7waGM@public.gmane.org>
To: David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: zhen-hual-VXdhtT5mjnY@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 2/4] iommu/vt-d: Don't consider copied context entries as present
Date: Thu, 11 Jun 2015 16:12:56 +0200 [thread overview]
Message-ID: <20150611141256.GF16345@suse.de> (raw)
In-Reply-To: <1434031622.3907.40.camel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
On Thu, Jun 11, 2015 at 03:07:02PM +0100, David Woodhouse wrote:
> On Thu, 2015-06-11 at 15:47 +0200, Joerg Roedel wrote:
> > From: Joerg Roedel <jroedel-l3A5Bk7waGM@public.gmane.org>
> >
> > Hide the copied context entries from the IOMMU driver by
> > considering them as non-present. This is implemented by
> > setting the first AVL bit (bit 67) in the context entry to
> > one. If this bit is set, the context_present() function
> > returns false.
> >
> > Signed-off-by: Joerg Roedel <jroedel-l3A5Bk7waGM@public.gmane.org>
>
> In the extended context entry, bit 67 is the PGE bit. There are no bits
> which are available to software, to my knowledge.
Ah you are right, I was looking at the context-entry format without
PASID. Then I have to solve this differently. Thanks for pointing that
out.
Joerg
WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <jroedel@suse.de>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Joerg Roedel <joro@8bytes.org>,
iommu@lists.linux-foundation.org, zhen-hual@hp.com,
bhe@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/4] iommu/vt-d: Don't consider copied context entries as present
Date: Thu, 11 Jun 2015 16:12:56 +0200 [thread overview]
Message-ID: <20150611141256.GF16345@suse.de> (raw)
In-Reply-To: <1434031622.3907.40.camel@infradead.org>
On Thu, Jun 11, 2015 at 03:07:02PM +0100, David Woodhouse wrote:
> On Thu, 2015-06-11 at 15:47 +0200, Joerg Roedel wrote:
> > From: Joerg Roedel <jroedel@suse.de>
> >
> > Hide the copied context entries from the IOMMU driver by
> > considering them as non-present. This is implemented by
> > setting the first AVL bit (bit 67) in the context entry to
> > one. If this bit is set, the context_present() function
> > returns false.
> >
> > Signed-off-by: Joerg Roedel <jroedel@suse.de>
>
> In the extended context entry, bit 67 is the PGE bit. There are no bits
> which are available to software, to my knowledge.
Ah you are right, I was looking at the context-entry format without
PASID. Then I have to solve this differently. Thanks for pointing that
out.
Joerg
next prev parent reply other threads:[~2015-06-11 14:12 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-11 13:47 [PATCH 0/4] More cleanups and fixes for Intel VT-d Joerg Roedel
2015-06-11 13:47 ` Joerg Roedel
[not found] ` <1434030463-942-1-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2015-06-11 13:47 ` [PATCH 1/4] iommu/vt-d: Remove iommu_attach_domain_with_id() Joerg Roedel
2015-06-11 13:47 ` Joerg Roedel
2015-06-11 13:47 ` [PATCH 2/4] iommu/vt-d: Don't consider copied context entries as present Joerg Roedel
2015-06-11 13:47 ` Joerg Roedel
[not found] ` <1434030463-942-3-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2015-06-11 14:07 ` David Woodhouse
2015-06-11 14:07 ` David Woodhouse
[not found] ` <1434031622.3907.40.camel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-06-11 14:12 ` Joerg Roedel [this message]
2015-06-11 14:12 ` Joerg Roedel
[not found] ` <20150611141256.GF16345-l3A5Bk7waGM@public.gmane.org>
2015-06-11 14:19 ` David Woodhouse
2015-06-11 14:19 ` David Woodhouse
2015-06-11 14:25 ` Joerg Roedel
2015-06-11 14:25 ` Joerg Roedel
2015-06-11 14:44 ` David Woodhouse
2015-06-11 15:12 ` David Woodhouse
[not found] ` <20150611142554.GG16345-l3A5Bk7waGM@public.gmane.org>
2015-06-11 14:51 ` Joerg Roedel
2015-06-11 14:51 ` Joerg Roedel
2015-06-11 13:47 ` [PATCH 3/4] iommu/vt-d: Remove unmap_device_dma() Joerg Roedel
2015-06-11 13:47 ` Joerg Roedel
2015-06-11 13:47 ` [PATCH 4/4] iommu/vt-d: Make sure si_domain is allocated for kdump kernel Joerg Roedel
2015-06-11 13:47 ` Joerg Roedel
2015-06-11 15:54 ` [PATCH 0/4] More cleanups and fixes for Intel VT-d David Woodhouse
2015-06-11 15:54 ` David Woodhouse
2015-06-12 7:31 ` Joerg Roedel
[not found] ` <1434038066.3907.85.camel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-06-12 20:29 ` Joerg Roedel
2015-06-12 20:29 ` Joerg Roedel
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