linux-dev - Linux kernel development work

Age	Commit message (Collapse)	Author	Files	Lines
2015-03-16	xen/privcmd: improve performance of MMAPBATCH_V2	David Vrabel	1	-18/+28
	Make the IOCTL_PRIVCMD_MMAPBATCH_V2 (and older V1 version) map multiple frames at a time rather than one at a time, despite the pages being non-consecutive GFNs. xen_remap_foreign_mfn_array() is added which maps an array of GFNs (instead of a consecutive range of GFNs). Since per-frame errors are returned in an array, privcmd must set the MMAPBATCH_V1 error bits as part of the "report errors" phase, after all the frames are mapped. Migrate times are significantly improved (when using a PV toolstack domain). For example, for an idle 12 GiB PV guest: Before After real 0m38.179s 0m26.868s user 0m15.096s 0m13.652s sys 0m28.988s 0m18.732s Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2015-03-16	xen: unify foreign GFN map/unmap for auto-xlated physmap guests	David Vrabel	1	-0/+133
	Auto-translated physmap guests (arm, arm64 and x86 PVHVM/PVH) map and unmap foreign GFNs using the same method (updating the physmap). Unify the two arm and x86 implementations into one commont one. Note that on arm and arm64, the correct error code will be returned (instead of always -EFAULT) and map/unmap failure warnings are no longer printed. These changes are required if the foreign domain is paging (-ENOENT failures are expected and must be propagated up to the caller). Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>