From: Alexander Graf <ag...@suse.de> When the guest activates the FPU, we load it up. That's fine when it wasn't activated before on the host, but if it was we end up reloading FPU values from last time the FPU was deactivated on the host without writing the proper values back to the vcpu struct.
This patch checks if the FPU is enabled already and if so just doesn't bother activating it, making FPU operations survive guest context switches. Signed-off-by: Alexander Graf <ag...@suse.de> Signed-off-by: Avi Kivity <a...@redhat.com> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 400ae0a..029e1be 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -701,6 +701,11 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, return RESUME_GUEST; } + /* We already own the ext */ + if (vcpu->arch.guest_owned_ext & msr) { + return RESUME_GUEST; + } + #ifdef DEBUG_EXT printk(KERN_INFO "Loading up ext 0x%lx\n", msr); #endif -- To unsubscribe from this list: send the line "unsubscribe kvm-commits" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html