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authorAndrea Arcangeli <andrea@qumranet.com>2008-05-01 18:43:33 +0200
committerAvi Kivity <avi@qumranet.com>2008-05-04 14:44:48 +0300
commitbc1a34f1bf354fabc03e3f465620c80e510d0e8f (patch)
treef16228a547097d8d7ad621064c463f3e92cc9557 /arch/x86
parentb4f14abd95cd8d42f08438f1c4ec3eafe41054ee (diff)
KVM: avoid fx_init() schedule in atomic
This make sure not to schedule in atomic during fx_init. I also changed the name of fpu_init to fx_finit to avoid duplicating the name with fpu_init that is already used in the kernel, this makes grep simpler if nothing else. Signed-off-by: Andrea Arcangeli <andrea@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/x86.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bc224bba1e87..21338bdb28ff 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3703,10 +3703,19 @@ void fx_init(struct kvm_vcpu *vcpu)
{
unsigned after_mxcsr_mask;
+ /*
+ * Touch the fpu the first time in non atomic context as if
+ * this is the first fpu instruction the exception handler
+ * will fire before the instruction returns and it'll have to
+ * allocate ram with GFP_KERNEL.
+ */
+ if (!used_math())
+ fx_save(&vcpu->arch.host_fx_image);
+
/* Initialize guest FPU by resetting ours and saving into guest's */
preempt_disable();
fx_save(&vcpu->arch.host_fx_image);
- fpu_init();
+ fx_finit();
fx_save(&vcpu->arch.guest_fx_image);
fx_restore(&vcpu->arch.host_fx_image);
preempt_enable();