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* xen/multicall: move *idx fields to start of mc_bufferJeremy Fitzhardinge2011-07-181-1/+1
| | | | | | The CPU would prefer small offsets. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
* xen/multicall: special-case singleton hypercallsJeremy Fitzhardinge2011-07-181-5/+22
| | | | | | | Singleton calls seem to end up being pretty common, so just directly call the hypercall rather than going via multicall. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
* xen/multicalls: add unlikely around slowpath in __xen_mc_entry()Jeremy Fitzhardinge2011-07-181-2/+2
| | | | Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
* xen/multicalls: disable MC_DEBUGJeremy Fitzhardinge2011-07-181-2/+2
| | | | | | | It's useful - and probably should be a config - but its very heavyweight, especially with the tracing stuff to help sort out problems. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
* xen/trace: add multicall tracingJeremy Fitzhardinge2011-07-181-8/+23
| | | | Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
* xen/multicalls: remove debugfs statsJeremy Fitzhardinge2011-07-181-108/+1
| | | | | | Remove debugfs stats to make way for tracing. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
* xen: off by one errors in multicalls.cDan Carpenter2011-06-031-6/+6
| | | | | | | | | | | b->args[] has MC_ARGS elements, so the comparison here should be ">=" instead of ">". Otherwise we read past the end of the array one space. CC: stable@kernel.org Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
* x86, xen: do multicall callbacks with interrupts disabledJeremy Fitzhardinge2009-02-161-2/+2
| | | | | | | | We can't call the callbacks after enabling interrupts, as we may get a nested multicall call, which would cause a great deal of havok. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86, xen: degrade BUG to WARN when multicall failsJeremy Fitzhardinge2009-02-161-1/+1
| | | | | | | | If one of the components of a multicall fails, WARN rather than BUG, to help with debugging. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86, xen: record and display initiator of each multicall when debuggingIan Campbell2009-02-161-2/+7
| | | | | | | Store the caller for each multicall so we can report it on failure. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: whitespace/checkpatch cleanupTej2008-12-161-1/+1
| | | | | | | | Impact: cleanup Signed-off-by: Tej <bewith.tej@gmail.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: add debugfs supportJeremy Fitzhardinge2008-08-211-2/+113
| | | | | | | | | | | | | Add support for exporting statistics on mmu updates, multicall batching and pv spinlocks into debugfs. The base path is xen/ and each subsystem adds its own directory: mmu, multicalls, spinlocks. In each directory, writing 1 to "zero_stats" will cause the corresponding stats to be zeroed the next time they're updated. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: print backtrace on multicall failureJeremy Fitzhardinge2008-07-161-0/+1
| | | | | | | | | | Print a backtrace if a multicall fails, to help with debugging. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: add mechanism to extend existing multicallsJeremy Fitzhardinge2008-06-251-6/+34
| | | | | | | | | | | | | | | | | | | | | | 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>
* x86: coding style fixes to arch/x86/xen/multicalls.cPaolo Ciarrocchi2008-04-171-2/+2
| | | | | | | | | | | | | | | | | | | | | | 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>
* xen: add some debug output for failed multicallsJeremy Fitzhardinge2007-10-161-0/+25
| | | | | | | | | | 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>
* xen: add batch completion callbacksJeremy Fitzhardinge2007-10-161-3/+26
| | | | | | | | | | | | | 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>
* i386: move xenThomas Gleixner2007-10-111-0/+90
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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