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KVM: fx_init() needs preemption disabled while it plays with the FPU state

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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>
This commit is contained in:
Rusty Russell 2007-07-30 16:29:56 +10:00 committed by Avi Kivity
parent 11ec280471
commit 9bd01506ee
1 changed files with 3 additions and 0 deletions
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3
drivers/kvm/kvm_main.c
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@ -693,10 +693,13 @@ void fx_init(struct kvm_vcpu *vcpu)
} *fx_image; } *fx_image;
/* Initialize guest FPU by resetting ours and saving into guest's */
preempt_disable();
fx_save(vcpu->host_fx_image); fx_save(vcpu->host_fx_image);
fpu_init(); fpu_init();
fx_save(vcpu->guest_fx_image); fx_save(vcpu->guest_fx_image);
fx_restore(vcpu->host_fx_image); fx_restore(vcpu->host_fx_image);
preempt_enable();
fx_image = (struct fx_image_s *)vcpu->guest_fx_image; fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
fx_image->mxcsr = 0x1f80; fx_image->mxcsr = 0x1f80;