On 21/03/17 21:10, Christoffer Dall wrote: > From: Christoffer Dall <cdall@xxxxxxxxxxxxxxx> > > We don't have to save/restore the VMCR on every entry to/from the guest, > since on GICv2 we can access the control interface from EL1 and on VHE > systems with GICv3 we can access the control interface from KVM running > in EL2. > > GICv3 systems without VHE become the rare case, which have to > save/restore the register in the put/load functions by doing an extra > jump to EL2 to access the EL2-only register state. > > Note that userspace accesses may see out-of-date values if the VCPU is > running while accessing the VGIC state via the KVM device API, but this > is already the case and it is up to userspace to quiesce the CPUs before > reading the CPU registers from the GIC for an up-to-date view. > > Signed-off-by: Christoffer Dall <cdall@xxxxxxxxxxxxxxx> > Signed-off-by: Christoffer Dall <cdall@xxxxxxxxxx> Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx> M. -- Jazz is not dead. It just smells funny...
