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Christian Borntraeger e1788bb995 KVM: s390: handle floating point registers in the run ioctl not in vcpu_put/load ... Right now we switch the host fprs/vrs in kvm_arch_vcpu_load and switch back in kvm_arch_vcpu_put. This process is already optimized since commit 9977e886cb ("s390/kernel: lazy restore fpu registers") avoiding double save/restores on schedule. We still reload the pointers and test the guest fpc on each context switch, though. We can minimize the cost of vcpu_load/put by doing the test in the VCPU_RUN ioctl itself. As most VCPU threads almost never exit to userspace in the common fast path, this allows to avoid this overhead for the common case (eventfd driven I/O, all exits including sleep handled in the kernel) - making kvm_arch_vcpu_load/put basically disappear in perf top. Also adapt the fpu get/set ioctls. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>		8 years ago
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interrupt.c	…
irq.h	…
kvm-s390.c	KVM: s390: handle floating point registers in the run ioctl not in vcpu_put/load	8 years ago
kvm-s390.h	…
priv.c	…
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sthyi.c	…
trace-s390.h	…
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