On Wed, 2014-08-27 at 13:23 +0200, Alexander Graf wrote: > > 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? :) I'm OK with it. -Scott -- 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
