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KVM: s390: introduce post handlers for STSI

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The Store System Information (STSI) instruction currently collects all
information it relays to the caller in the kernel. Some information,
however, is only available in user space. An example of this is the
guest name: The kernel always sets "KVMGuest", but user space knows the
actual guest name.

This patch introduces a new exit, KVM_EXIT_S390_STSI, guarded by a
capability that can be enabled by user space if it wants to be able to
insert such data. User space will be provided with the target buffer
and the requested STSI function code.

Reviewed-by: Eric Farman <farman@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Ekaterina Tumanova <tumanova@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Ekaterina Tumanova
2015-01-30 16:55:56 +01:00
committed by Christian Borntraeger
parent 41408c28f2
commit e44fc8c9da
5 changed files with 61 additions and 1 deletions
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arch/s390/include/asm/kvm_host.h
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@@ -565,6 +565,7 @@ struct kvm_arch{
int use_vectors;
int user_cpu_state_ctrl;
int user_sigp;
int user_stsi;
struct s390_io_adapter *adapters[MAX_S390_IO_ADAPTERS];
wait_queue_head_t ipte_wq;
int ipte_lock_count;