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xen-devel
Re: [Xen-devel] Re: Next steps with pv_ops for Xen
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To: |
Gerd Hoffmann <kraxel@xxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] Re: Next steps with pv_ops for Xen |
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From: |
Derek Murray <Derek.Murray@xxxxxxxxxxxx> |
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Date: |
Mon, 03 Dec 2007 13:19:08 +0000 |
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Cc: |
"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Eduardo Habkost <ehabkost@xxxxxxxxxx>, Juan Quintela <quintela@xxxxxxxxxx>, "Stephen C. Tweedie" <sct@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx>, Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>, Chris Wright <chrisw@xxxxxxxxxxxx>, "virtualization@xxxxxxxxxxxxxx" <virtualization@xxxxxxxxxxxxxx> |
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Mon, 03 Dec 2007 05:19:56 -0800 |
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I take the blame for that one. I added the hook because, if a process
were to die whilst holding one or more grants, there were no hooks that
would make it possible to carry out the grant-unmap. All existing hooks
on either the device or the VMA were called *after* the PTEs were cleared.
It gets better, though. The same hook is used in the version of blktap
in linux-2.6.18-xen (not, as far as I can see, in the sparse tree for
xen-3.1-testing):
http://xenbits.xensource.com/linux-2.6.18-xen.hg?file/fd879c0688bf/drivers/xen/blktap/blktap.c
Reverting back to the old (hookless) behaviour would be a retrograde
step IMHO.
Cheers,
Derek Murray.
Gerd Hoffmann wrote:
Stephen C. Tweedie wrote:
Hi all,
driver domains
Looked at the gntdev (grant table mappings for user space) driver,
noticed that one is not self-contained. It needs a hook for page unmapping:
http://xenbits.xensource.com/xen-3.1-testing.hg?rev/7180d2e61f92
plus an s/ptep_get_and_clear_full/zap_pte/ fixup a few changesets
later.
Upstreaming that one could become *uhm* intresting. Nevertheless the
gntdev functionality is quite useful for writing pure userspace
backend drivers ...
cheers,
Gerd
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