diff options
| author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2014-03-14 11:00:21 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-04-29 15:01:54 +0200 |
| commit | 8ad357551797b1edc184fb9f6a4f80a6fa626459 (patch) | |
| tree | 3700cdc96803f5be483cd79453b240c73b522f3a /arch/s390/include | |
| parent | 6852d7b69b4949234c3a8ae1f279f6a4c6563662 (diff) | |
| download | linux-8ad357551797b1edc184fb9f6a4f80a6fa626459.tar.bz2 | |
KVM: s390: enable IBS for single running VCPUs
This patch enables the IBS facility when a single VCPU is running.
The facility is dynamically turned on/off as soon as other VCPUs
enter/leave the stopped state.
When this facility is operating, some instructions can be executed
faster for single-cpu guests.
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/kvm_host.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 0d45f6fe734f..f0a1dc5e5d1f 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -72,6 +72,7 @@ struct sca_block { #define CPUSTAT_ZARCH 0x00000800 #define CPUSTAT_MCDS 0x00000100 #define CPUSTAT_SM 0x00000080 +#define CPUSTAT_IBS 0x00000040 #define CPUSTAT_G 0x00000008 #define CPUSTAT_GED 0x00000004 #define CPUSTAT_J 0x00000002 @@ -411,6 +412,7 @@ struct kvm_arch{ int use_cmma; struct s390_io_adapter *adapters[MAX_S390_IO_ADAPTERS]; wait_queue_head_t ipte_wq; + spinlock_t start_stop_lock; }; #define KVM_HVA_ERR_BAD (-1UL) |