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Jeremy Fitzhardinge e57778a1e3 xen: implement ptep_modify_prot_start/commit ... Xen has a pte update function which will update a pte while preserving its accessed and dirty bits. This means that ptep_modify_prot_start() can be implemented as a simple read of the pte value. The hardware may update the pte in the meantime, but ptep_modify_prot_commit() updates it while preserving any changes that may have happened in the meantime. The updates in ptep_modify_prot_commit() are batched if we're currently in lazy mmu mode. The mmu_update hypercall can take a batch of updates to perform, but this code doesn't make particular use of that feature, in favour of using generic multicall batching to get them all into the hypervisor. The net effect of this is that each mprotect pte update turns from two expensive trap-and-emulate faults into they hypervisor into a single hypercall whose cost is amortized in a batched multicall. 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>		17 years ago
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interface	xen: implement ptep_modify_prot_start/commit	17 years ago
balloon.h	xen: add balloon driver	17 years ago
events.h	xen: implement save/restore	17 years ago
features.h	…
grant_table.h	xen: implement save/restore	17 years ago
hvc-console.h	xen: fix "xen: implement save/restore"	17 years ago
page.h	…
xen-ops.h	xen: maintain clock offset over save/restore	17 years ago
xenbus.h	xen blkfront: Delay wait for block devices until after the disk is added	17 years ago
xencomm.h	xen: import arch generic part of xencomm	17 years ago