On 13.08.14 11:09, Bharat Bhushan wrote: > This patch emulates debug registers and debug exception > to support guest using debug resource. This enables running > gdb/kgdb etc in guest. > > On BOOKE architecture we cannot share debug resources between QEMU and > guest because: > When QEMU is using debug resources then debug exception must > be always enabled. To achieve this we set MSR_DE and also set > MSRP_DEP so guest cannot change MSR_DE. > > When emulating debug resource for guest we want guest > to control MSR_DE (enable/disable debug interrupt on need). > > So above mentioned two configuration cannot be supported > at the same time. So the result is that we cannot share > debug resources between QEMU and Guest on BOOKE architecture. > > In the current design QEMU gets priority over guest, this means that if > QEMU is using debug resources then guest cannot use them and if guest is > using debug resource then QEMU can overwrite them. > > Signed-off-by: Bharat Bhushan <Bharat.Bhushan@xxxxxxxxxxxxx> Scott, could you please recheck whether you're ok with it now? :) Thanks, Alex -- 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
