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s390/sthyi: add cache to store hypervisor info

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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>
This commit is contained in:
QingFeng Hao
2017-09-29 12:41:51 +02:00
committed by Martin Schwidefsky
parent b7c92f1a4e
commit 9fb6c9b3fe
4 changed files with 71 additions and 26 deletions
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arch/s390/include/asm/kvm_host.h
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@@ -736,7 +736,6 @@ struct kvm_arch{
wait_queue_head_t ipte_wq;
int ipte_lock_count;
struct mutex ipte_mutex;
struct ratelimit_state sthyi_limit;
spinlock_t start_stop_lock;
struct sie_page2 *sie_page2;
struct kvm_s390_cpu_model model;