On 07/10/2015 08:01 PM, Paolo Bonzini wrote:
We can disable CD unconditionally when there is no assigned device. KVM now forces guest PAT to all-writeback in that case, so it makes sense to also force CR0.CD=0. When there are assigned devices, emulate cache-disabled operation through the page tables. This behavior is consistent with VMX, where CD/NW are not touched by vmentry/vmexit. Note that buggy firmware that does not clear CD/NW is _seriously_ old: SeaBIOS for example has been doing it since October 2008.
Reviewed-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
