[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCHv7 0/9] Xen: extend kexec hypercall for use with pv-ops kernels
The series (for Xen 4.4) improves the kexec hypercall by making Xen responsible for loading and relocating the image. This allows kexec to be usable by pv-ops kernels and should allow kexec to be usable from a HVM or PVH privileged domain. The first patch is a simple clean-up. Patch 2 introduces the new ABI. Patch 3 and 4 nearly completely reimplement the kexec load, unload and exec sub-ops. The old load_v1 sub-op is then implemented on top of the new code. Patch 5 calls the kexec image when dom0 crashes. This avoids having to alter dom0 kernels to do a exec sub-op call on crash -- a SHUTDOWN_crash by dom0 will trigger the kexec. Patches 6 and 7 add the libxc API for the kexec calls. These have been acked-by Ian Campbell already. Patch 8 adds a link time check for the size of the relocate code. Patch 9 adds myself as the maintainer for kexec in Xen. The required patch series for kexec-tools will be posted shortly and are available from the xen-v4 branch of: http://xenbits.xen.org/gitweb/?p=people/dvrabel/kexec-tools.git;a=summary Changes since v6: - No longer use GUEST_HANDLE_64(), get a uniform ABI by using unions and explicit padding. - Only map the segments and not all of RAM. - Add a mechanism to create mappings for use by the exec'd image (a segment with a NULL buf handle). - Fix a bug where a crash image's code page would by placed at machine address 0 (instead of inside the crash region). Changes since v5: - Fix double free in KEXEC_load_v1 failure path. - Only copy the relocation code and not the whole page. - Add myself as the kexec maintainer. Changes since v4 (v5 was not posted to the list): - _rsvd -> _pad in one of the public ABI structures. - Fix bug where trailing pages were not zeroed. This fixes loading a 64-bit Linux kernel using a more recent version of kexec-tools. - Check the relocation code fits into a page at link time. Changes since v3: - Use paddr_t and page_to_maddr() etc. for portability. - Add explicit padding to hypercall structures where required. - Minor cleanup of the kexec_reloc assembly. - Print a message before exec'ing a crash image. - Style fixes (tabs, trailing whitespace) and typos. - Fix a bug where using the V1 interface and unloading a image may crash. Changes since v2: - Provide old struct xen_kexec_load if __XEN_INTERFACE_VERSION__ < 4.3 - Adjust new struct xen_kexec_load to avoid unnecessary padding. - Use domheap pages for the image and control pages. - Remove the DBG() macros from the reloc code. David _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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