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| author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2016-01-18 14:46:34 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2016-02-10 13:12:49 +0100 |
| commit | 6fd8e67dd83437118cf46a4a9c224142004c3d51 (patch) | |
| tree | 99b5feb06cbeb2fd6dbd0fd3a6adbac54dbe37fd /arch/s390/kvm | |
| parent | f6aa6dc44948739be39c20bbcbbe8cff5d77fe18 (diff) | |
| download | linux-6fd8e67dd83437118cf46a4a9c224142004c3d51.tar.bz2 | |
KVM: s390: sync of fp registers via kvm_run
As we already store the floating point registers in the vector save area
in floating point register format when we don't have MACHINE_HAS_VX, we can
directly expose them to user space using a new sync flag.
The floating point registers will be valid when KVM_SYNC_FPRS is set. The
fpc will also be valid when KVM_SYNC_FPRS is set.
Either KVM_SYNC_FPRS or KVM_SYNC_VRS will be enabled, never both.
Let's also change two positions where we access vrs, making the code easier
to read and one comment superfluous.
Suggested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 8fcdf9836321..2270fe4c8b71 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -1419,6 +1419,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) */ if (MACHINE_HAS_VX) vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS; + else + vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS; if (kvm_is_ucontrol(vcpu->kvm)) return __kvm_ucontrol_vcpu_init(vcpu); @@ -1433,10 +1435,10 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc; vcpu->arch.host_fpregs.regs = current->thread.fpu.regs; - /* Depending on MACHINE_HAS_VX, data stored to vrs either - * has vector register or floating point register format. - */ - current->thread.fpu.regs = vcpu->run->s.regs.vrs; + if (MACHINE_HAS_VX) + current->thread.fpu.regs = vcpu->run->s.regs.vrs; + else + current->thread.fpu.regs = vcpu->run->s.regs.fprs; current->thread.fpu.fpc = vcpu->run->s.regs.fpc; if (test_fp_ctl(current->thread.fpu.fpc)) /* User space provided an invalid FPC, let's clear it */ @@ -2389,7 +2391,7 @@ int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) fprs, 128); } else { rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, - vcpu->run->s.regs.vrs, 128); + vcpu->run->s.regs.fprs, 128); } rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA, vcpu->run->s.regs.gprs, 128); |