[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC PATCH] crashdump/x86: Add option to get crash kernel region size
On Sat, Nov 28, 2015 at 09:14:04PM +0100, Daniel Kiper wrote: > Crash kernel region size is available via sysfs on Linux running on > bare metal. However, this does not work when Linux runs as Xen dom0. > In this case Xen crash kernel region size should be established using > __HYPERVISOR_kexec_op hypercall (Linux kernel kexec functionality does > not make a lot of sense in Xen dom0). Sadly hypercalls are not easily > accessible using shell scripts or something like that. Potentially we > can check "xl dmesg" output for crashkernel option but this is not nice. > So, let's add this functionality, for Linux running on bare metal and > as Xen dom0, to kexec-tools. This way kdump scripts may establish crash > kernel region size in one way regardless of platform. All burden of > platform detection lies on kexec-tools. > > Figure (and unit) displayed by this new kexec-tools functionality is > the same as one taken from /sys/kernel/kexec_crash_size. > > This functionality is available on x86 platform only. If idea is acceptable > then I can prepare patches for other platforms (if it is possible and make > sense) and repost them as fully flagged patch series. > > Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx> Thanks, applied. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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