On 20/06/14 12:19, Aurelien Jarno wrote: > On Fri, Jun 20, 2014 at 12:38:30PM +0200, Paolo Bonzini wrote: >> Il 20/06/2014 11:10, Aurelien Jarno ha scritto: >>>> My idea was to add a machines-specific option umkernel=on, and require it >>>> in order to run KVM. Later we can add umkernel=on support for TCG as well, >>>> while umkernel=off with KVM requires virtualization extensions. >>>> >>>> The same option can disable pflash boot. >>>> >>>> What do you think? >>> >>> For what I understand the current KVM support in MIPS uses trap and >>> emulate and thus doesn't need hardware support, just a recent kernel >>> with the option enabled. >> >> Yes, but work to support virtualization extensions is underway. >> Patches were posted a few months ago. >> >>> That's why I do wonder if there is a real point >>> in supporting UM kernels in TCG mode. >> >> Debugging, mainly. It is sometimes useful to compare TCG with KVM >> on x86, and I suppose it could be the same on MIPS. > > Ok, then we can indeed add a umkernel option, which is always enabled > with KVM, and which disable the flash (and why not other devices) in > that case. > > At some point it might be a good idea to add a specific machine for > emulation/virtualization, like it is done on ARM, which do not have to > handle this kind of devices, and which does not have all the current > limitations of the Malta board. FYI Cavium have been working on a para-virtualised machine which they use with their VZ KVM implementation. They're using lkvm, but I expect it will make sense to port that to QEMU too. lkvm patchset (applied): https://www.mail-archive.com/kvm%40vger.kernel.org/msg102792.html linux kernel patchset (merged in v3.16-rc1): https://www.mail-archive.com/kvm%40vger.kernel.org/msg102806.html Cheers James -- 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
