diff options
| author | Paul Mackerras <paulus@samba.org> | 2013-10-15 20:43:03 +1100 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-01-09 10:15:02 +0100 |
| commit | 99dae3bad28d8fdd32b7bfdd5e2ec7bb2d4d019d (patch) | |
| tree | 524617ede36278f57f7a06be1f6ea88987f520c0 /arch/powerpc/kvm/booke.c | |
| parent | efff19122315f1431f6b02cd2983b15f5d3957bd (diff) | |
| download | linux-rt-99dae3bad28d8fdd32b7bfdd5e2ec7bb2d4d019d.tar.gz | |
KVM: PPC: Load/save FP/VMX/VSX state directly to/from vcpu struct
Now that we have the vcpu floating-point and vector state stored in
the same type of struct as the main kernel uses, we can load that
state directly from the vcpu struct instead of having extra copies
to/from the thread_struct. Similarly, when the guest state needs to
be saved, we can have it saved it directly to the vcpu struct by
setting the current->thread.fp_save_area and current->thread.vr_save_area
pointers. That also means that we don't need to back up and restore
userspace's FP/vector state. This all makes the code simpler and
faster.
Note that it's not necessary to save or modify current->thread.fpexc_mode,
since nothing in KVM uses or is affected by its value. Nor is it
necessary to touch used_vr or used_vsr.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/booke.c')
| -rw-r--r-- | arch/powerpc/kvm/booke.c | 16 |
1 files changed, 0 insertions, 16 deletions
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 0033465ecc3f..a983ccaf3cce 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -682,10 +682,6 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) { int ret, s; struct thread_struct thread; -#ifdef CONFIG_PPC_FPU - struct thread_fp_state fp; - int fpexc_mode; -#endif if (!vcpu->arch.sane) { kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR; @@ -703,11 +699,6 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) #ifdef CONFIG_PPC_FPU /* Save userspace FPU state in stack */ enable_kernel_fp(); - fp = current->thread.fp_state; - fpexc_mode = current->thread.fpexc_mode; - - /* Restore guest FPU state to thread */ - current->thread.fp_state = vcpu->arch.fp; /* * Since we can't trap on MSR_FP in GS-mode, we consider the guest @@ -741,13 +732,6 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) kvmppc_save_guest_fp(vcpu); vcpu->fpu_active = 0; - - /* Save guest FPU state from thread */ - vcpu->arch.fp = current->thread.fp_state; - - /* Restore userspace FPU state from stack */ - current->thread.fp_state = fp; - current->thread.fpexc_mode = fpexc_mode; #endif out: |