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authorChristian Borntraeger <borntraeger@de.ibm.com>2008-03-25 18:47:31 +0100
committerAvi Kivity <avi@qumranet.com>2008-04-27 12:00:46 +0300
commit5288fbf0ef041ba0e8b4dcb2df4536b5e3a48b32 (patch)
tree6f81a87294c9026ac91a84e5a94e55e565002d3b /include/asm-s390
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')
-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 {
u32 instruction_chsc;
u32 instruction_stsi;
u32 instruction_stfl;
+ u32 instruction_sigp_sense;
+ u32 instruction_sigp_emergency;
+ u32 instruction_sigp_stop;
+ u32 instruction_sigp_arch;
+ u32 instruction_sigp_prefix;
+ u32 instruction_sigp_restart;
};
struct io_info {
@@ -169,6 +175,10 @@ struct interrupt_info {
};
};
+/* for local_interrupt.action_flags */
+#define ACTION_STORE_ON_STOP 1
+#define ACTION_STOP_ON_STOP 2
+
struct local_interrupt {
spinlock_t lock;
struct list_head list;
@@ -176,6 +186,8 @@ struct local_interrupt {
struct float_interrupt *float_int;
int timer_due; /* event indicator for waitqueue below */
wait_queue_head_t wq;
+ atomic_t *cpuflags;
+ unsigned int action_bits;
};
struct float_interrupt {