Xen devel - Feb 2010 - Blktap2 patches not in pvops yet ?

Hello Daniel,

It seems that only the hypervisor patches for blktap2 have made it into
xen-unstable, but it seems Jeremy hasn''t had the time to put the rest
in the pvops kernel yet.
Do you have a recent set of patches against the current pvops kernel available
for testing ?


-- 
Best regards,
 Sander                          mailto:linux@eikelenboom.it


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Hi.

Updates since the last time I posted them:

 * Correctly initialize request SG lists.

 * Removed init_mm dependency.
   Somewhat experimental but I don''t see how it could cause trouble.

Open issues:

 * -DMEMSHR in tools/blktap2 is broken.
 * CONFIG_HIGHPTE fails remapping foreign frame ranges.
 

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Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>




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xen_invlpg() flushes tlb on its cpu, but tlb flush is needed on
all cpus. So replace xen_invlpg() with more proper ones.
Maybe it would be possible to make tlb flush less.
this patch also makes blktap2 compile on ia64 because xen_invlpg()
is x86 specific.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>

linux-2.6-pvops:
 * rebase against git-da22857f (port blktap2 from 2.6.18 to tip)
 * rebase against git-fbbc8527 (wean off of use of the BlkBack pageflag)
 * gpl-export flush_tlb_page, flush_tlb_all

Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>




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Signed-off-by: Jan Beulich <jbeulich@novell.com>

linux-2.6-pvops:
 * rebase against git-41a06958 (merge into xen/master)

Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>




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... and also allow to interact with blkback when that''s also built as
a module.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

linux-2.6-pvops:
 * Strip n/a xen_tlb_flush exports
 * Fix obj macro naming in Makefile
 * Avoid init_mm, remap kernel ranges using tapdisk''s mm instead.
 * gpl-export zap_page_range

Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>




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c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

To linux-2.6-pvops:
 * Stripped arch/i386/mm/hypervisor.c exports
 * Stripped xen_invlpg_all(kvaddr) use on CONFIG_X86

Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>




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blkback''s page map code needs to be accessible to both blkback and
blktap2, irrespective of whether either or both are modules. The
most immediate solution is to break it out into a separate, library-
like component that doesn''t need building if either of the two
consumers is configured off, and that gets built as a module if both
consumers are modules.

Also fix the dummy implementation of blkback_pagemap_read(), since
using BUG() there doesn''t compile.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

linux-2.6-git:
 * adjust XEN_BLKBACK_PAGEMAP dependencies
 * rebase against git-fbbc8527 (wean off of use of the BlkBack pageflag)

Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>




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Just like in blkfront, not doing so can cause the maximum number of
segments check to trigger.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

linux-2.6-pvops:
 * Rebase against git-fbbc8527 (wean off of use of the BlkBack pageflag)
 * Scatterlist: fix access macro usage, add initcall to device creation.

Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>




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This patch removes the following warnings on ia64.
> linux-2.6.18-xen.hg/drivers/xen/blktap2/device.c: In function
  ''blktap_device_finish_request'':
> linux-2.6.18-xen.hg/drivers/xen/blktap2/device.c:403: warning:
  format ''%lld'' expects type ''long long
int'', but argument 7 has type
''uint64_t''
> linux-2.6.18-xen.hg/drivers/xen/blktap2/sysfs.c: In function
  ''blktap_sysfs_debug_device'':
> linux-2.6.18-xen.hg/drivers/xen/blktap2/sysfs.c:276: warning: format
  ''%llu'' expects type ''long long unsigned
int'', but argument 4 has type
  ''uint64_t''

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>




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Signed-off-by: Jake Wires <jake.wires@citrix.com>




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Signed-off-by: Jan Beulich <jbeulich@novell.com>




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There are quite a number of places where e.g. page->va->page
translations happen.

Besides yielding smaller code (source and binary), a second goal is to
make it easier to determine where virtual addresses of pages allocated
through alloc_empty_pages_and_pagevec() are really used (in turn in
order to determine whether using highmem pages would be possible
there).

Signed-off-by: Jan Beulich <jbeulich@novell.com>

linux-2.6-pvops:
 * Stripped drivers/xen/gntdev/*
 * Stripped drivers/xen/netback/*

Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>




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Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>




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