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| author | Sebastian Ene <sebastianene@google.com> | 2022-07-11 08:17:20 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-14 16:54:17 +0200 |
| commit | 6c93c6f3bad468ce4b8c843227d60fbeb02fd741 (patch) | |
| tree | eecf58af1a6c98b6fba0aaa679df66399f787830 /drivers/misc/Kconfig | |
| parent | 952ae488b9492b40ea18b5de101afce69b965336 (diff) | |
| download | linux-stable-6c93c6f3bad468ce4b8c843227d60fbeb02fd741.tar.gz linux-stable-6c93c6f3bad468ce4b8c843227d60fbeb02fd741.tar.bz2 linux-stable-6c93c6f3bad468ce4b8c843227d60fbeb02fd741.zip | |
misc: Add a mechanism to detect stalls on guest vCPUs
This driver creates per-cpu hrtimers which are required to do the
periodic 'pet' operation. On a conventional watchdog-core driver, the
userspace is responsible for delivering the 'pet' events by writing to
the particular /dev/watchdogN node. In this case we require a strong
thread affinity to be able to account for lost time on a per vCPU.
This part of the driver is the 'frontend' which is reponsible for
delivering the periodic 'pet' events, configuring the virtual peripheral
and listening for cpu hotplug events. The other part of the driver is
an emulated MMIO device which is part of the KVM virtual machine
monitor and this part accounts for lost time by looking at the
/proc/{}/task/{}/stat entries.
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Will Deacon <will@kernel.org>
Signed-off-by: Sebastian Ene <sebastianene@google.com>
Link: https://lore.kernel.org/r/20220711081720.2870509-3-sebastianene@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/Kconfig')
| -rw-r--r-- | drivers/misc/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 41d2bb0ae23a..94e9fb4cdd76 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -483,6 +483,19 @@ config OPEN_DICE If unsure, say N. +config VCPU_STALL_DETECTOR + tristate "Guest vCPU stall detector" + depends on OF && HAS_IOMEM + help + When this driver is bound inside a KVM guest, it will + periodically "pet" an MMIO stall detector device from each vCPU + and allow the host to detect vCPU stalls. + + To compile this driver as a module, choose M here: the module + will be called vcpu_stall_detector. + + If you do not intend to run this kernel as a guest, say N. + source "drivers/misc/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" source "drivers/misc/cb710/Kconfig" |