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authorChristian Borntraeger <borntraeger@de.ibm.com>2008-03-25 13:47:31 -0400
committerAvi Kivity <avi@qumranet.com>2008-04-27 05:00:46 -0400
commit5288fbf0ef041ba0e8b4dcb2df4536b5e3a48b32 (patch)
tree6f81a87294c9026ac91a84e5a94e55e565002d3b /include/asm-s390/kvm_host.h
parent453423dce2785b8e22077e3b3eeecb4f60fe3470 (diff)
KVM: s390: interprocessor communication via sigp
This patch introduces in-kernel handling of _some_ sigp interprocessor signals (similar to ipi). kvm_s390_handle_sigp() decodes the sigp instruction and calls individual handlers depending on the operation requested: - sigp sense tries to retrieve information such as existence or running state of the remote cpu - sigp emergency sends an external interrupt to the remove cpu - sigp stop stops a remove cpu - sigp stop store status stops a remote cpu, and stores its entire internal state to the cpus lowcore - sigp set arch sets the architecture mode of the remote cpu. setting to ESAME (s390x 64bit) is accepted, setting to ESA/S390 (s390, 31 or 24 bit) is denied, all others are passed to userland - sigp set prefix sets the prefix register of a remote cpu For implementation of this, the stop intercept indication starts to get reused on purpose: a set of action bits defines what to do once a cpu gets stopped: ACTION_STOP_ON_STOP really stops the cpu when a stop intercept is recognized ACTION_STORE_ON_STOP stores the cpu status to lowcore when a stop intercept is recognized Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'include/asm-s390/kvm_host.h')
-rw-r--r--include/asm-s390/kvm_host.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/asm-s390/kvm_host.h b/include/asm-s390/kvm_host.h
index 2eaf6fede025..1c829bdf5889 100644
--- a/include/asm-s390/kvm_host.h
+++ b/include/asm-s390/kvm_host.h
@@ -128,6 +128,12 @@ struct kvm_vcpu_stat {
128 u32 instruction_chsc; 128 u32 instruction_chsc;
129 u32 instruction_stsi; 129 u32 instruction_stsi;
130 u32 instruction_stfl; 130 u32 instruction_stfl;
131 u32 instruction_sigp_sense;
132 u32 instruction_sigp_emergency;
133 u32 instruction_sigp_stop;
134 u32 instruction_sigp_arch;
135 u32 instruction_sigp_prefix;
136 u32 instruction_sigp_restart;
131}; 137};
132 138
133struct io_info { 139struct io_info {
@@ -169,6 +175,10 @@ struct interrupt_info {
169 }; 175 };
170}; 176};
171 177
178/* for local_interrupt.action_flags */
179#define ACTION_STORE_ON_STOP 1
180#define ACTION_STOP_ON_STOP 2
181
172struct local_interrupt { 182struct local_interrupt {
173 spinlock_t lock; 183 spinlock_t lock;
174 struct list_head list; 184 struct list_head list;
@@ -176,6 +186,8 @@ struct local_interrupt {
176 struct float_interrupt *float_int; 186 struct float_interrupt *float_int;
177 int timer_due; /* event indicator for waitqueue below */ 187 int timer_due; /* event indicator for waitqueue below */
178 wait_queue_head_t wq; 188 wait_queue_head_t wq;
189 atomic_t *cpuflags;
190 unsigned int action_bits;
179}; 191};
180 192
181struct float_interrupt { 193struct float_interrupt {