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| author | Pierre Morel <pmorel@linux.ibm.com> | 2020-09-07 15:26:07 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2021-03-09 10:16:26 +0100 |
| commit | 87e28a15c42cc592009c32a8c20e5789059027c2 (patch) | |
| tree | d1fecf787809e547737239ce637072fcca473c18 /arch/s390/kernel/smp.c | |
| parent | KVM: s390: Fix comment spelling in kvm_s390_vcpu_start() (diff) | |
| download | linux-87e28a15c42cc592009c32a8c20e5789059027c2.tar.xz linux-87e28a15c42cc592009c32a8c20e5789059027c2.zip | |
KVM: s390: diag9c (directed yield) forwarding
When we intercept a DIAG_9C from the guest we verify that the
target real CPU associated with the virtual CPU designated by
the guest is running and if not we forward the DIAG_9C to the
target real CPU.
To avoid a diag9c storm we allow a maximal rate of diag9c forwarding.
The rate is calculated as a count per second defined as a new
parameter of the s390 kvm module: diag9c_forwarding_hz .
The default value of 0 is to not forward diag9c.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Link: https://lore.kernel.org/r/1613997661-22525-2-git-send-email-pmorel@linux.ibm.com
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/smp.c')
| -rw-r--r-- | arch/s390/kernel/smp.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 58c8afa3da65..2fec2b80d35d 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -429,6 +429,7 @@ void notrace smp_yield_cpu(int cpu) asm volatile("diag %0,0,0x9c" : : "d" (pcpu_devices[cpu].address)); } +EXPORT_SYMBOL_GPL(smp_yield_cpu); /* * Send cpus emergency shutdown signal. This gives the cpus the |