On 2015-04-21 13:32, Paolo Bonzini wrote: > Basically it's an optimization. The guest can set the UC memory type on > PCI BARs that are actually backed by RAM in QEMU, and then accesses to > these BARs will be unnecessarily slow. It would be particularly bad if, > for example, access to ivshmem were slowed down because the guest PAT > says the memory is uncacheable. ivshmem is pv anyway - why shouldn't the guest driver take this room for optimization into account and ask for a cached mapping? Is that that only use case? Jan -- Siemens AG, Corporate Technology, CT RTC ITP SES-DE Corporate Competence Center Embedded Linux -- 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
