[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v4 0/9] libxc: support building large pv-domains
On 05/11/15 15:36, Juergen Gross wrote: > The Xen hypervisor supports starting a dom0 with large memory (up to > the TB range) by not including the initrd and p2m list in the initial > kernel mapping. Especially the p2m list can grow larger than the > available virtual space in the initial mapping. > > The started kernel is indicating the support of each feature via > elf notes. > > This series enables the domain builder in libxc to do the same as the > hypervisor. This enables starting of huge pv-domUs via xl. > > Unmapped initrd is supported for 64 and 32 bit domains, omitting the > p2m from initial kernel mapping is possible for 64 bit domains only. > > Tested with: > - 32 bit domU (kernel not supporting unmapped initrd) > - 32 bit domU (kernel supporting unmapped initrd) > - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m) > - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m) > - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m) > - HVM domU > > Changes in v4: > - updated patch 1 as suggested by Wei Liu (comment and variable name) > - modify comment in patch 6 as suggested by Wei Liu > - rework of patch 8 reducing line count by nearly 100 > - added some additional plausibility checks to patch 8 as suggested by > Wei Liu > - renamed round_pg() to round_pg_up() in patch 9 as suggested by Wei Liu > > Changes in v3: > - Rebased the complete series to new staging (hvm builder patches by > Roger Pau Monne) > - Removed old patch 1 as it broke stubdom build > - Introduced new Patch 1 to make allocation of guest memory more clear > regarding virtual/physical memory allocation (requested by Ian Campbell) > - Change name of flag to indicate support of unmapped initrd in patch 2 > (requested by Ian Campbell) > - Introduce new patches 3, 4, 5 ("rename domain builder count_pgtables to > alloc_pgtables", "introduce domain builder architecture specific data", > "use domain builder architecture private data for x86 pv domains") to > assist later page table work > - don't fiddle with initrd virtual address in patch 6 (was patch 3 in v2), > add explicit initrd parameters for start_info in struct xc_dom_image > instead (requested by Ian Campbell) > - Introduce new patch 8 ("rework of domain builder's page table handler") > to be able to use common helpers for unmapped p2m list (requested by > Ian Campbell) > - use now known segment size in pages for p2m list in patch 9 (was patch > 5 in v2) instead of fiddling with segment end address (requested by > Ian Campbell) > - split alloc_p2m_list() in patch 9 (was patch 5 in v2) to 32/64 bit > variants (requested by Ian Campbell) > > Changes in v2: > - patch 2 has been removed as it has been applied already > - introduced new patch 2 as suggested by Ian Campbell: add a flag > indicating support of an unmapped initrd to the parsed elf data of > the elf_dom_parms structure > - updated patch description of patch 3 as requested by Ian Campbell > > > Juergen Gross (9): > libxc: reorganize domain builder guest memory allocator > xen: add generic flag to elf_dom_parms indicating support of unmapped > initrd > libxc: rename domain builder count_pgtables to alloc_pgtables > libxc: introduce domain builder architecture specific data > libxc: use domain builder architecture private data for x86 pv domains > libxc: create unmapped initrd in domain builder if supported > libxc: split p2m allocation in domain builder from other magic pages > libxc: rework of domain builder's page table handler > libxc: create p2m list outside of kernel mapping if supported > > stubdom/grub/kexec.c | 12 +- > tools/libxc/include/xc_dom.h | 34 +-- > tools/libxc/xc_dom_arm.c | 6 +- > tools/libxc/xc_dom_core.c | 180 ++++++++---- > tools/libxc/xc_dom_x86.c | 563 > +++++++++++++++++++++---------------- > tools/libxc/xg_private.h | 39 +-- > xen/arch/x86/domain_build.c | 4 +- > xen/common/libelf/libelf-dominfo.c | 3 + > xen/include/xen/libelf.h | 1 + > 9 files changed, 490 insertions(+), 352 deletions(-) Could someone please comment on patches 1, 8 and 9? Juergen _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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