On 07.03.2025 15:24, Andrew Cooper wrote: > When a watchdog fires, the domain is crashed and can't dump any state. > > Xen allows a domain to have two separate watchdogs. Therefore, for a > domain running multiple watchdogs (e.g. one based around network, one > for disk), it is important for diagnostics to know which watchdog > fired. > > As the printk() is in a timer callback, this is a bit awkward to > arrange, but there are 12 spare bits in the bottom of the domain > pointer owing to its alignment. > > Reuse these bits to encode the watchdog id too, so the one which fired > is identified when the domain is crashed. > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Jan Beulich <jbeul...@suse.com>
