Re: Kexec (and HyperV) (was: Re: Dimdows Decay Syndrome Continues)

On Sat, 8 Feb 2025 23:42:11 -0000 (UTC), Lawrence D'Oliveiro
<ldo@nz.invalid> wrote in <vo8q4j$8tqo$2@dont-email.me>:

On 8 Feb 2025 08:44:20 GMT, vallor wrote:
 

On Sat, 8 Feb 2025 06:36:16 -0000 (UTC), Lawrence D'Oliveiro
<ldo@nz.invalid> wrote in <vo6u10$3ue2q$1@dont-email.me>:
 

Doesn’t RHEL support kexec, which allows the old Linux kernel to pass
control to the new one without actually disrupting the userland?

 
You're thinking of live kernel patching.  kexec_load(2) load a kernel
that you can have execute if the current kernel crashes.  You do this
for debugging, usually.

 
Bit more than that <https://manpages.debian.org/kexec_load(2)>:
 
    The kexec_load() system call loads a new kernel that can be executed
    later by reboot(2).
 
And one of the functions of the latter
<https://manpages.debian.org/reboot(2)> is:
 
    LINUX_REBOOT_CMD_KEXEC
      (RB_KEXEC, 0x45584543, since Linux 2.6.13). Execute a kernel that
      has been loaded earlier with kexec_load(2).

I don't see your point.  (That's what I said.)

It doesn't load "without disturbing the userland"...

--
-v System76 Thelio Mega v1.1 x86_64 NVIDIA RTX 3090 Ti
   OS: Linux 6.13.1 Release: Mint 22.1 Mem: 258G
   "Why is "easy listening" so hard to listen to?"