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KVM: s390: pv: module parameter to fence asynchronous destroy

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Add the module parameter "async_destroy", to allow the asynchronous
destroy mechanism to be switched off. This might be useful for
debugging purposes.

The parameter is enabled by default since the feature is opt-in anyway.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Link: https://lore.kernel.org/r/20221111170632.77622-7-imbrenda@linux.ibm.com
Message-Id: <20221111170632.77622-7-imbrenda@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2022-11-11 18:06:32 +01:00 • committed by Janosch Frank
parent f7866f582b
commit cc72688607
1 changed files with 7 additions and 1 deletions
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8
arch/s390/kvm/kvm-s390.c
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@ -209,7 +209,13 @@ unsigned int diag9c_forwarding_hz;
module_param(diag9c_forwarding_hz, uint, 0644);
MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off");
static int async_destroy;
/*
* allow asynchronous deinit for protected guests; enable by default since
* the feature is opt-in anyway
*/
static int async_destroy = 1;
module_param(async_destroy, int, 0444);
MODULE_PARM_DESC(async_destroy, "Asynchronous destroy for protected guests");
/*
* For now we handle at most 16 double words as this is what the s390 base