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Hardware watchdog

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Here is an updated hardware watchdog patch, which should fix
everything that was raised about the previous version ...

Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Richard W.M. Jones 2009-04-25 13:56:19 +01:00 • committed by Anthony Liguori
parent ffad4116b9
commit 9dd986ccf6
9 changed files with 865 additions and 0 deletions
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49
qemu-options.hx
View file

@ -1448,6 +1448,55 @@ order cores with complex cache hierarchies. The number of instructions
executed often has little or no correlation with actual performance.
ETEXI
DEF("watchdog", HAS_ARG, QEMU_OPTION_watchdog, \
"-watchdog i6300esb|ib700\n" \
" enable virtual hardware watchdog [default=none]\n")
STEXI
@item -watchdog @var{model}
Create a virtual hardware watchdog device. Once enabled (by a guest
action), the watchdog must be periodically polled by an agent inside
the guest or else the guest will be restarted.
The @var{model} is the model of hardware watchdog to emulate. Choices
for model are: @code{ib700} (iBASE 700) which is a very simple ISA
watchdog with a single timer, or @code{i6300esb} (Intel 6300ESB I/O
controller hub) which is a much more featureful PCI-based dual-timer
watchdog. Choose a model for which your guest has drivers.
Use @code{-watchdog ?} to list available hardware models. Only one
watchdog can be enabled for a guest.
ETEXI
DEF("watchdog-action", HAS_ARG, QEMU_OPTION_watchdog_action, \
"-watchdog-action reset|shutdown|poweroff|pause|debug|none\n" \
" action when watchdog fires [default=reset]\n")
STEXI
@item -watchdog-action @var{action}
The @var{action} controls what QEMU will do when the watchdog timer
expires.
The default is
@code{reset} (forcefully reset the guest).
Other possible actions are:
@code{shutdown} (attempt to gracefully shutdown the guest),
@code{poweroff} (forcefully poweroff the guest),
@code{pause} (pause the guest),
@code{debug} (print a debug message and continue), or
@code{none} (do nothing).
Note that the @code{shutdown} action requires that the guest responds
to ACPI signals, which it may not be able to do in the sort of
situations where the watchdog would have expired, and thus
@code{-watchdog-action shutdown} is not recommended for production use.
Examples:
@table @code
@item -watchdog i6300esb -watchdog-action pause
@item -watchdog ib700
@end table
ETEXI
DEF("echr", HAS_ARG, QEMU_OPTION_echr, \
"-echr chr set terminal escape character instead of ctrl-a\n")
STEXI