On 01/13/2011 02:59 PM, Jan Kiszka wrote:
> @@ -5351,6 +5351,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) > int r; > sigset_t sigsaved; > > + if (!tsk_used_math(current)&& init_fpu(current)) > + return -ENOMEM; > + Could become a rainy day for the kvm-kmod maintainer: For compat support on kernels without init_fpu exported yet, can I trigger the same result by simply issuing an FPU instruction here so that do_device_not_available will perform the allocation? Not really nice, but it doesn't appear to me like there is any code path that would complain about in-kernel FPU usage (provided we don't need math emulation - which is quite likely).
That's a pessimization, since it forces the fpu to be switched. If both qemu and the guest don't use the fpu, we can run a guest with some other task's fpu loaded.
Oh, but if it's after the check for !tsk_used_math(), it only triggers once, so that's okay. I guess something like mov %%xmm0, %%xmm0 should do nicely.
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