Am 07.01.2011 13:40, Alexander Graf wrote: > > On 07.01.2011, at 13:08, Liu Yu-B13201 wrote: > >> >> Hi all, >> >> When guest reboot, it's better to reset status by qemu, and then sync them >> back to kvm >> However as you know there's no BOOKE mmu emulation in qemu, >> So that qemu cannot directly reset BOOKE TLB. >> Moreover a lot SPR registers also cannot be reset by qemu. >> >> As a workaround, we need a interface that qemu can notify kvm to reset the >> status. >> My question is, what should the interface be? >> Looks like there's no alike interface in other archs. >> Should we define a ioctl command number only used by BOOKE or powerpc? > > Wouldn't it make more sense to just fake-implement the registers (SPRs and > unused TLB) and sync that back on reset? You don't have to implement the > actual mmu logic, but that keeps things at the same place at least. >
This is how it's done on x86, and it's the preferred way. There will never be such things as KVM_IOCTL_RESET. BTW, isn't the TLB state relevant for vmsave/restore? Then it should be made accessible for user space anyway. Jan
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