Commit f6aa6dc4 authored Jan 15, 2016 by David Hildenbrand Committed by Christian Borntraeger Feb 10, 2016

KVM: s390: allow sync of fp registers via vregs



If we have MACHINE_HAS_VX, the floating point registers are stored
in the vector register format, event if the guest isn't enabled for vector
registers. So we can allow KVM_SYNC_VRS as soon as MACHINE_HAS_VX is
available.

This can in return be used by user space to support floating point
registers via struct kvm_run when the machine has vector registers.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

parent bce87cce

arch/s390/kvm/kvm-s390.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -1414,7 +1414,10 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
		KVM_SYNC_PFAULT;
		if (test_kvm_facility(vcpu->kvm, 64))
		vcpu->run->kvm_valid_regs \|= KVM_SYNC_RICCB;
		if (test_kvm_facility(vcpu->kvm, 129))
		/* fprs can be synchronized via vrs, even if the guest has no vx. With
		* MACHINE_HAS_VX, (load\|store)_fpu_regs() will work with vrs format.
		*/
		if (MACHINE_HAS_VX)
		vcpu->run->kvm_valid_regs \|= KVM_SYNC_VRS;

		if (kvm_is_ucontrol(vcpu->kvm))

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