On Tue, Sep 27, 2011 at 5:01 PM, Richard Henderson <r...@twiddle.net> wrote: > On 09/27/2011 09:53 AM, Blue Swirl wrote: >>> > So how would you emulate cache lines with line locking on KVM? >> The cache would be a MMIO device which registers to handle all memory >> space. Configuring the cache controller changes how the device >> operates. Put this device between CPU and memory and other devices. >> Performance would probably be horrible, so CPU should disable the >> device automatically after some time. >> > > Seems like a better alternative would be to add an mmio device when > a line is actually locked. And the device would cover *only* the > locked line. I assume that following the boot process these lines > are unlocked, and the normal running state of the system would have > none of these mmio devices active.
The BIOS may also attempt to perform tests with the cache device, probe for cache sizes or read back I/D TLB lines via diagnostic modes. That wouldn't work in your approach.
