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| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-07-30 10:29:56 +0400 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-10-13 12:18:20 +0400 |
| commit | 9bd01506ee551689b90ba5822c28ef55207146af (patch) | |
| tree | 811e7ac5e8571e172fce8b7199830f9f511440ba /drivers/kvm | |
| parent | 11ec2804711896546ee3c945f3786c7f9fdd175a (diff) | |
| download | linux-9bd01506ee551689b90ba5822c28ef55207146af.tar.xz | |
KVM: fx_init() needs preemption disabled while it plays with the FPU state
Now that kvm generally runs with preemption enabled, we need to protect
the fpu intialization sequence.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm')
| -rw-r--r-- | drivers/kvm/kvm_main.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 7aeaaba79c54..5b42731beba4 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -693,10 +693,13 @@ void fx_init(struct kvm_vcpu *vcpu) } *fx_image; + /* Initialize guest FPU by resetting ours and saving into guest's */ + preempt_disable(); fx_save(vcpu->host_fx_image); fpu_init(); fx_save(vcpu->guest_fx_image); fx_restore(vcpu->host_fx_image); + preempt_enable(); fx_image = (struct fx_image_s *)vcpu->guest_fx_image; fx_image->mxcsr = 0x1f80; |