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Some Xen hypercalls accept an array of operations to work on. In
general this is because its more efficient for the hypercall to the
work all at once rather than as separate hypercalls (even batched as a
multicall).
This patch adds a mechanism (xen_mc_extend_args()) to allocate more
argument space to the last-issued multicall, in order to extend its
argument list.
The user of this mechanism is xen/mmu.c, which uses it to extend the
args array of mmu_update. This is particularly valuable when doing
the update for a large mprotect, which goes via
ptep_modify_prot_commit(), but it also manages to batch updates to
pgd/pmds as well.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Before:
total: 2 errors, 2 warnings, 138 lines checked
After:
total: 0 errors, 2 warnings, 138 lines checked
No code changed:
arch/x86/xen/multicalls.o:
text data bss dec hex filename
887 2832 0 3719 e87 multicalls.o.before
887 2832 0 3719 e87 multicalls.o.after
md5:
cf6d72d9db6dc5a3ebe01eec9f05e95f multicalls.o.before.asm
cf6d72d9db6dc5a3ebe01eec9f05e95f multicalls.o.after.asm
Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Multicalls are expected to never fail, and the normal response to a
failed multicall is very terse. In the interests of better
debuggability, add some more verbose output. It may be worth turning
this off once it all seems more tested.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
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This adds a mechanism to register a callback function to be called once
a batch of hypercalls has been issued. This is typically used to unlock
things which must remain locked until the hypercall has taken place.
[ Stable folks: pre-req for 2.6.23 bugfix "xen: deal with stale cr3
values when unpinning pagetables" ]
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Stable Kernel <stable@kernel.org>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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