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(parent: bba7cc8) | patch
s390/sthyi: add cache to store hypervisor info
authorQingFeng Hao <haoqf@linux.vnet.ibm.com>
Fri, 29 Sep 2017 10:41:51 +0000 (12:41 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Mon, 9 Oct 2017 09:15:35 +0000 (11:15 +0200)
commitcb1f5f9deb34bed4f3694942adace18fb3e32041
tree9b530f5034bad26c87adf9b17919d01438e20e18tree | snapshot
parentbba7cc80242840327c08f871b7b58467c1160ceccommit | diff
s390/sthyi: add cache to store hypervisor info

STHYI requires extensive locking in the higher hypervisors and is
very computational/memory expensive. Therefore we cache the retrieved
hypervisor info whose valid period is 1s with mutex to allow concurrent
access. rw semaphore can't benefit here due to cache line bounce.

Signed-off-by: QingFeng Hao <haoqf@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/include/asm/kvm_host.h diff | blob | history
arch/s390/kernel/sthyi.c diff | blob | history
arch/s390/kvm/intercept.c diff | blob | history
arch/s390/kvm/kvm-s390.c diff | blob | history
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