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Hermes SMTP Server) with ESMTPA ID 37747466b1a90a07168896b733ea2d20; Sun, 04 Aug 2024 13:17:43 +0000 (UTC) Message-ID: Date: Sun, 4 Aug 2024 18:47:23 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: kexec failure with Xen 4.19-rc4 and 4.20-dev on linux host To: Jan Beulich Cc: kexec@lists.infradead.org, horms@verge.net.au, xen-devel@lists.xenproject.org, Baoquan He , andrew.cooper3@citrix.com References: <05395ed2-3bf3-4926-8e24-c2e7ff37ed26@yahoo.com> Content-Language: en-US From: A Kundu In-Reply-To: X-Mailer: WebService/1.1.22544 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240804_061749_853962_1DE25ED0 X-CRM114-Status: GOOD ( 27.55 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: 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GXvFKYLCQZflt6qUAzBS8XIVSxn8Bcs5RxYBejlorXp229rHMW.hkO7jNsdNM5y3Fg.mNl_KAa2C BkAZ.WnD0SgWMNm.0FDbunUaGPEKltkSUhMl38NORGP3zs8QNJZJ8q6Gn7jAyjLXMf__q_l.rNIC 0ZzO_Tvr3GgADDpdkwcjEAr3an__PyZTxhAz.T3Q9DKI89erzYfT5dUj2haQ3oKfFI8YGkb3sEMJ HIM9kyMsf3_rTwx2KKCeVgx73SFIQQMK7OsaOyyTiEyDQ.7MivheTg9052BygNQ4jIB1xMflK5j0 6GjBiyfDhiqhBKsSf0Zo472DuwYKe7YVea9A3aSGhY.k_ivGHj80JrpJhLhCwIrgbLru1yC7UHk7 _X8KEr8z1atWBrogwIaWpuEKNo5oUBogZbtbqmTbyt3cf4ZjyHS4p_8JPfaJSIywYzGLJB0.VkjY zaErbMPlGEz5hAA.TFcwXGmW7sv.PUCq8s1wnRwxl0FxHfc3EpIpDH78MquISftexO8Xmwosi3QM USmEcA7P_tlvk_pK3NmYY.rAK9hsYGJu8rgXRJ42qJG6v6AZkWUWi3IC5KN5DekJtfC6q3kYiR52 oFA-- X-Sonic-MF: X-Sonic-ID: b9a632db-0c31-4574-a195-875efe122acf Message-ID: Date: Sun, 4 Aug 2024 18:47:23 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: kexec failure with Xen 4.19-rc4 and 4.20-dev on linux host To: Jan Beulich Cc: kexec@lists.infradead.org, horms@verge.net.au, xen-devel@lists.xenproject.org, Baoquan He , andrew.cooper3@citrix.com References: <05395ed2-3bf3-4926-8e24-c2e7ff37ed26@yahoo.com> Content-Language: en-US From: A Kundu In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Mailer: WebService/1.1.22544 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo On 8/2/24 13:25, Jan Beulich wrote: > 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. Dear Jan, Thank you for your response and suggestions. As mentioned in my original message, I have already attempted to load Xen using kexec with various versions (4.17, 4.19-rc4, and 4.20-dev), all of which resulted in the same error: Could not find a free area of memory of 0x3b6001 bytes... elf_exec_build_load_relocatable: ELF exec load failed I have also followed up on your suggestion to check the Xen boot log using "xl dmesg", but unfortunately, I received the following error: xencall: error: Could not obtain handle on privileged command interface: No such file or directory libxl: error: libxl.c:102:libxl_ctx_alloc: cannot open libxc handle: No such file or directory cannot init xl context This indicates that Xen did not boot successfully, so there are no logs available. > > 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, ... > In an attempt to resolve the memory allocation issue, I have tried the following: Added a crashkernel=@ parameter to the host kernel command line to reserve a dedicated memory region for kexec, and attempted to load Xen into that area. Experimented with the mem= parameter to limit the amount of memory used by the host kernel, hoping to leave more contiguous space available for loading Xen. Unfortunately, neither of these approaches resolved the issue, and I still encounter the same memory allocation error when attempting to load Xen with kexec. I have also reviewed the available documentation for kexec and Xen, but much of it appears to be outdated, referencing archaic options like --vmm which no longer exist in the current version of kexec-tools. > Jan At this point, I'm unsure of how to proceed. I suspect the issue may be related to changes in the kexec codebase and its interaction with Xen, as kexec docs for Xen has not been actively maintained since 2017. git log -1 --format="%ad" -- docs/misc/kexec_and_kdump.txt Fri Jun 9 14:11:37 2017 +0200 If it's not too much to ask, could you please check if you can successfully launch the Xen kernel using kexec with kexec-tools version > 2.x.x and a Linux kernel version >= 6.6? I have never been able to boot the Xen kernel with anything (syslinux, zfsbootmenu)other than GRUB and mboot.c32, as used by Citrix or XCP-ng. In fact, I have never come across a Xen distribution that doesn't rely on GRUB for xen, which makes me question whether kexec'ing the Xen kernel is even possible at this point. For reference, I'm providing a log of my attempts to boot Xen using ZFSBootMenu (a barebones linux kernel trying to boot via kexec; other details irrelevant): tee: /zfsbootmenu/environments/zroot/ROOT/debian/mnt/var/zbm.log: Read-only file system === Attempting to Launch Xen === Selected Kernel     : /boot/vmlinuz-6.9.12-amd64 Selected initramfs  : /boot/initrd.img-6.9.12-amd64 Selected BE         : zroot/ROOT/debian Selected Mountpoint : /zfsbootmenu/environments/zroot/ROOT/debian/mnt ZFSBootMenu kernel commandline: quiet loglevel=0 zfs get org.zfsbootmenu:commandline zroot/ROOT/debian NAME               PROPERTY VALUE                                        SOURCE zroot/ROOT/debian  org.zfsbootmenu:commandline  quiet crashkernel=0M memmap=64M$0x100000000  local (^^^ This is the linux/dom0 commandline, executed by kexec) === Memory reported by head /proc/meminfo === MemTotal:        8044084 kB MemFree:         7822332 kB MemAvailable:    7687320 kB Buffers:              0 kB Cached:           49136 kB SwapCached:           0 kB Active:           45868 kB Inactive:             0 kB Active(anon):     45868 kB Inactive(anon):       0 kB === End of Memory Report === Xen kernel found. Attempting kexec... Xen Kernel Path     : /zfsbootmenu/environments/zroot/ROOT/debian/mnt/boot/xen.gz Try gzip decompression. Could not find a free area of memory of 0x3ba001 bytes... elf_exec_build_load_relocatable: ELF exec load failed Executing kexec... Nothing has been loaded! After booting into linux what happens, I have already shared. If you have any further insights or suggestions on how to overcome this memory allocation issue or successfully boot Xen using kexec on a modern system, I would greatly appreciate your guidance. Thank you for your time and assistance. Best regards, A Kundu