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| author | Michael Mueller <mimu@linux.ibm.com> | 2020-02-27 10:10:31 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2020-02-27 19:47:13 +0100 |
| commit | cc674ef252f4750bdcea1560ff491081bb960954 (patch) | |
| tree | 8f1735b69f2dd1b8fbd4d535ca5b00b50db8a309 /net/mac80211/tx.c | |
| parent | 04ed89dc4aeba57ab99df16edbd9d06e43d0a2c4 (diff) | |
| download | linux-cc674ef252f4750bdcea1560ff491081bb960954.tar.gz linux-cc674ef252f4750bdcea1560ff491081bb960954.tar.bz2 linux-cc674ef252f4750bdcea1560ff491081bb960954.zip | |
KVM: s390: introduce module parameter kvm.use_gisa
The boolean module parameter "kvm.use_gisa" controls if newly
created guests will use the GISA facility if provided by the
host system. The default is yes.
# cat /sys/module/kvm/parameters/use_gisa
Y
The parameter can be changed on the fly.
# echo N > /sys/module/kvm/parameters/use_gisa
Already running guests are not affected by this change.
The kvm s390 debug feature shows if a guest is running with GISA.
# grep gisa /sys/kernel/debug/s390dbf/kvm-$pid/sprintf
00 01582725059:843303 3 - 08 00000000e119bc01 gisa 0x00000000c9ac2642 initialized
00 01582725059:903840 3 - 11 000000004391ee22 00[0000000000000000-0000000000000000]: AIV gisa format-1 enabled for cpu 000
...
00 01582725059:916847 3 - 08 0000000094fff572 gisa 0x00000000c9ac2642 cleared
In general, that value should not be changed as the GISA facility
enhances interruption delivery performance.
A reason to switch the GISA facility off might be a performance
comparison run or debugging.
Signed-off-by: Michael Mueller <mimu@linux.ibm.com>
Link: https://lore.kernel.org/r/20200227091031.102993-1-mimu@linux.ibm.com
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'net/mac80211/tx.c')
0 files changed, 0 insertions, 0 deletions