kexec failure with Xen 4.19-rc4 and 4.20-dev on linux host

[Jan Beulich]

On 02.08.2024 09:28, A Kundu wrote:
> On 8/2/24 09:06, Baoquan He wrote:
>> On 07/31/24 at 06:34pm, A Kundu wrote:
>>> I am experiencing issues using kexec to load Xen 4.17(debian's apt version),
>>> Xen 4.19-rc4 (compiled from source) and 4.20-dev (compiled from source) on a
>>> debian host.
>> You should CC this to XEN dev list so that XEN dev knows this and may
>> provide help. Not everyone is interested in and knows XEN.
>>
>>> System information:
>>> $ uname -a
>>> Linux host 6.9.10-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.9.10-1 (2024-07-19)
>>> x86_64 GNU/Linux
>>>
>>> $ kexec --version # compiled from source tarball with ./configure --with-xen
>>> kexec-tools 2.0.29
>>>
>>> Steps to reproduce:
>>>
>>> 1. Set variables:
>>>
>>> XEN_HYPERVISOR="/boot/xen.gz"
>>> XEN_CMD="dom0_mem=6G dom0_max_vcpus=6 dom0_vcpus_pin cpufreq=xen"
>>>
>>> 2. Attempt to load Xen 4.19-rc4:
>>>
>>> # kexec -l "$XEN_HYPERVISOR" --command-line="$XEN_CMD"
>>> Could not find a free area of memory of 0x3b6001 bytes...
>>> elf_exec_build_load_relocatable: ELF exec load failed
>>>
>>> 3. Attempt to load Xen 4.20-dev:
>>>
>>> # kexec -l "$XEN_HYPERVISOR" --command-line="$XEN_CMD"
>>> Could not find a free area of memory of 0x3f8001 bytes...
>>> elf_exec_build_load_relocatable: ELF exec load failed
>>>
>>> 4. Attempt to load Xen 4.17 (from debian rrepositories):
>>> # kexec -l /boot/xen-4.17-amd64.gz --command-line="$XEN_CMD"
>>> Could not find a free area of memory of 0x3b4001 bytes...
>>> elf_exec_build_load_relocatable: ELF exec load failed

And with all of them saying effectively the same, did you verify you
actually have a sufficiently large area reserved? The obvious
place for you to look at is Xen's boot log (obtained via serial
console or "xl dmesg" immediately after booting the system). If you
find everything as expected there, ...

>>> If you need any further information to investigate this problem,
>>> please let me know.

... please provide that boot log.

Jan